PLEAASE HELP
Solid aluminum reacts with aqueous zinc bromide to form solid zinc and aqueous aluminum bromide .
Write a balanced chemical equation for this reaction.
Answers
Related Questions
What chemical reaction occurs when the positive ion from one compound replaces the positive ion of the other compound to form two new compounds. represented by AB + CD = AD + CB
synthesis
decomposition
single replacement
double replacement
combustion
Answers
The chemical reaction that occurs when the positive ion from one compound replaces the positive ion of the other compound is double replacement
What is a double displacement reaction?
This is a type of reaction in which there is an exchange of ion between the reacting agent. The ion in one of the reactant replaces or displaces the ion in the other reactant to produce two new products.
The reaction between sulphuric acid and potassium hydroxide illustrates a double displacement reaction
H₂SO₄ + 2KOH —> K₂SO₄ + 2H₂O
From the above equation, we can see that K and H exchange to produce K₂SO₄ and H₂O
With the above illustration we can answer the given question as follow
AB + CD = AD + CB
The above reaction is a double displacement reaction since A and C exchange to produce AD and CB
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Find the element that is oxidized and the one that is reduced KClO3 + 6 FeSO4 + 3 H2SO4 --> KCl + 3 Fe2(SO4)3 + 3 H2O
Answers
Answer: Fe is the element that is being oxidized (oxidation number changes from +2 to +3) while Cl is the element that is reduced (oxidation number changes from +5 to -1) in the given reaction.
Explanation:
The question requires us to find the element that is oxidized and the one reduced in the following chemical reaction:
[tex]KClO_3+6FeSO_4+3H_2SO_4\rightarrow KCl+3Fe_2(SO_4)_3+3H_2O[/tex]To solve this problem, we need to determine the oxidation number of all elements in the reactants and products sides, and then identify the elements that had their oxidation number increased (oxidized species) and decreased (reduced species).
To identify the oxidation numbers, we'll need to remember a few points:
- K is an alkali metal (part of group 1 in the periodic table), and it usually assumes the oxidation number +1;
- O usually presents oxidation number -2, except in a few specific cases;
- the anion (SO4) presents total charge -2 (in this anion, S presents oxidation number +6 and O, -2);
- H usually presents oxidation number +1.
Next, let's identify the oxidation number of all elements involved in the reaction, on both sides of the chemical equation. Since all compounds are neutral (i.e., they do not present charge), the sum of all oxidation numbers must be 0:
(note that the oxidation number of each element is indicated in red, above the respective element, while the contribution of this element to the molecule charge, considering the number of atoms, is represented in blue below the element).
In the image above, we can see that Cl has its oxidation number changing from +5 in KClO3 to -1 in KCl (highlighted in purple), while Fe has its oxidation number changing from +2 in FeSO4 to +3 in Fe2(SO4)3 (highlighted in green).
Therefore, we can say that Fe is the element that is being oxidized while Cl is the element that is reduced in the given reaction.
Dr. Peterson does an experiment to research the growth rate of mice. He has two groups of mice. He feeds one group a type of food and adds chemical A, which is supposed to increase growth rate. The other group he feeds the same food without chemical A added. His research shows that chemical A increases growth rate by 30%. He does the experiment 4 times and comes up with the same result each time.
Dr. Peterson concludes that chemical A does increase the growth rate of mice. Is Dr. Peterson's conclusion supported by scientific knowledge?
A. Yes; any study that involves a percentage is based on scientific knowledge.
B. No; scientific knowledge never comes from research or experiments.
C. Yes; his conclusion is supported by evidence from his experiment.
D. No; science cannot be used to research small animals such as mice.
Answers
Dr. Peterson performed an experiment in order to research the growth rate of mice. He had two groups of mice and he fed one group a type of food with added chemical which results in increasing the growth rate and fed same group of food to another batch without adding any chemicals. His research conveyed that chemical A increased the growth rate of mice by approximately 30%. He performed the same experiment 4 times and got the same result every time. Dr. Peterson concluded that the chemical A results in increase of growth rate of mice. The Interpretation of Dr. Peterson's experiment was supported by the evidence received from his experiment. Therefore, option C is correct.
In his experiment, Dr. Peterson found out that chemical A results in increasing the growth rate of mice by 30% and to make sure that the result obtained is valid and evidential, he performed the same experiment 4 times. Since every time the experiment was repeated, the result came out to be same, the closing statement from his experimental study can be accepted because they are backed by evidence.
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Beryllium, the first element in group 2, has an atomic number of 4. The second element in this group has an atomic number of.
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Beryllium, the first element in group 2, has an atomic number of 4. The second element in this group has an atomic number of 12.
In the field of chemistry, atomic number can be described as the number of protons that is present in the nucleus of an atom.
The atomic number of Beryllium is 4 as it has 4 protons in its nucleus.
The second member of the group 2 elements in the periodic table is Magnesium. Magnesium has an atomic number of 12 because it has 12 protons in its nucleus.
The atomic number is represented by the letter Z usually. The atomic number is usually mentioned in a periodic table at the top-left.
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Indicate the acid-base pairs for each of the following reactions:a) HClO3 + H2O <=> H3O + + ClO3-b) HSeO4 - + NH3 <=> NH4 + + SeO4 2-C) HCO3- + OH - <=> CO3 2- + H2OD) C5H5NH + + H2O <=> C5H5N + H3O+
Answers
Acid - base pairs.
Arrhenius theory, says, that acids are substances that dissociate in water to yield electrically charged atoms or molecules, called ions, one of which is a hydrogen ion (H+), and that bases ionize in water to yield hydroxide ions (OH−).
It is now known that the hydrogen ion cannot exist alone in water solution; rather, it exists in a combined state with a water molecule, as the hydronium ion (H3O+). In practice the hydronium ion is still customarily referred to as the hydrogen ion.
----------------------------------------------------------------------------------------------------------------
a) HClO3 + H2O <=> H3O + + ClO3-
HClO3 is the acid, ClO3- is the base (acid-base pair)
H2O acepts that H+ from the HClO3, and becomes H3O+
H2O is a base, H3O+ is the acid (acid-base pair)
----------------------------------------------------------------------------------------------------------------
b) HSeO4 - + NH3 <=> NH4 + + SeO4 2-
Here HSeO4 - can free one H so it would be the acid, and SeO4 2- is the base.
NH3 receives H+ from acid, so it is the base, and NH4+ is the acid.
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c) HCO3- + OH - <=> CO3 2- + H2O
HCO3- gives away one H, so it is the acid, and CO3 2- is the base
(HCO3-,CO3 2-) acid-base pair.
OH- receives the H+ and becomes H2O. OH- is the base and H2O acid.
H2O can be acid and base, remember that. In this case it is the acid.
---------------------------------------------------------------------------------------------------------------
d) C5H5NH + + H2O <=> C5H5N- + H3O+
C5H5NH has the H, but on the right it doesn't, so it would be th acid. C5H5N- is the base.
H2O here is a base, because it receives the H+, and becomes H3O+ (the acid).
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When a magnesium atom becomes a cation, the size of the radius ...
a) decreases because it lost electrons
b) increases because it gained electrons
c) increases because it lost electrons
d) decreases because it gained electrons
Answers
When a magnesium atom becomes a cation, the size of the radius decreases because it lost electrons (Option A)
Description of magnisium ionMagnesium is a divalent metal. It loses its valence electrons to form a stable octet electronic configuration.
Generally, the ions (or cations) of metals tends to be smaller than their atoms because they lose electrons to form ions.
Now, we shall consider the atom and the ion of magnesium to see the difference. Please see attached photo
Magnesium lose electrons to form ion (cations) as follow:
Mg -> Mg²⁺ + 2e
From the equation and the diagram, we can see that the ion of magnesium is smaller than its atom.
This is so because the magnesium atom has two electrons more than the magnesium ion.
Thus, we can say that the correct option is: decreases because it lost electrons (Option A)
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Due to the human extermination of prairie dogs in South Dakota, black footed ferrets became endangered in 1973. Only 18 ferrets were in existence in 1987. Rangers began a captive breeding program to increase their population numbers. The ferrets were later released in the Badlands and Wind Cave National Park in 2007.
Which type of conservation effort is this?
Responses
A. resource conservation
B. wildlife reintroduction
C.predator management
D.ecological introduction
Answers
The type of conservation effort which involves the captive breeding program to increase the population numbers of Ferrets is resource conservation and is denoted as option A.
What is Conservation?This is referred to as the process in which valuable resources which are present on earth such as plants, minerals etc are protected through various means by the appropriate authorities or individual.
Conservation helps to prevent dying out and extinction of species which is denoted in the captive breeding program to increase the population numbers of Ferrets so as to prevent the extinction of the animal hence option A was chosen.
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Q2.
This question is about the reaction between hydrogen sulfide (H₂S) and oxygen.
The equation for the reaction is:
2 H₂S(g) + 3 O₂(g) → 2 H₂O(g) + 2 SO₂(g)
(a) What does H₂O(g) represent?
(b) Calculate the volume of oxygen required to react with 50 cm³ of hydrogen sulfide.
Volume=
cm³
Answers
Answer:
q2
Explanation:
Both the reactants are gases at STP.
Equation:
2H2S + 302 → 2SO2 + 2H2O
As per this equation 2 moles (2 x 22.4 L) of H2S
need 3 moles (3 x 22.4 L) of oxygen for their
complete oxidation.
So, volume of oxygen needed for 2.8 L of H2S =
(2.8 x 3 x 22.4)/(2 x 22.4) = 4.2 L (answer)
(a) H₂O(g) represents water in the gaseous state. It is produced as a product of the reaction between hydrogen sulfide (H₂S) and oxygen (O₂).
What is gaseous state?Gaseous state refers to a substance existing as a gas. When a substance is in the gaseous state, its particles are not closely packed together like in a solid or liquid state. Instead, they are spread out and move freely, filling the available space.
(b) To calculate the volume of oxygen required to react with 50 cm³ of hydrogen sulfide, we need to use the stoichiometry of the reaction. From the balanced equation, we can see that the molar ratio between hydrogen sulfide (H₂S) and oxygen (O₂) is 2:3.
Given: Volume of hydrogen sulfide (H₂S) = 50 cm³
Using the molar ratio, we can set up the following proportion: 2 mol H₂S / 3 mol O₂ = 50 cm³ H₂S / x cm³ O₂
To find the volume of oxygen, we can solve for x:
x = (50 cm³ H₂S * 3 mol O₂) / 2 mol H₂S
Now, we need to convert the obtained moles of oxygen to volume using the ideal gas law. Since the volume is given in cm³, we can assume that the temperature and pressure are constant at standard conditions (typically 0°C and 1 atm).
Using the ideal gas law equation: PV = nRT
Assuming constant temperature and pressure, we can rearrange the equation as: V = (n * R * T) / P
Substituting the values: V = (moles of O₂ * 22.4 L/mol) / (1 atm)
Calculate the moles of O₂ using the obtained value from the proportion.
Finally, convert the volume from liters to cm³ by multiplying by 1000.
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what is the change in internal energy (in j) of a system that absorbs 0.842 kj of heat from its surroundings and has 0.649 kcal of work done on it? give your answer in scientific notation.
Answers
Answer:
need the free questions srry yall
Explanation:
selective analysis of an analyte and internal standard yielded detector responses of 3.47 and 5.23 respectively when each had a concentration of 1.00 ppm. five ml of an unknown analyte solution were mixed with 1 ml of 5.00 ppm internal standard and then diluted to a total of 10 ml. the detector responses for analyte and internal standard for this mixture were 4.26 and 2.43. calculate the concentration of the analyte in the unknown solution. report your answer in ppm.
Answers
By calculating the response factor for the internal standard first, we can calculate that the concentration of the unknown analyte sample is 2.64 ppm.
When solving problems like this, we need to calculate the appropriate response factor:
A(X) / C(X) = F * A(S) / C(S)
A(X) - response for the analyte (3.47)
C(X) - concentration of the analyte (1 ppm)
F - response factor
A(S) - response for the internal standard (5.23)
C(S) - concentration of the internal standard (1 ppm)
F = A(X) * C(S) / (C(X) * A(S)
F = 3.47 * 1 ppm / (5.23 * 1 ppm)
F = 0.663
Now we can use this in the second calculation to obtain the concentration of the analyte in the sample. One thing to note is that in second measurement 1 mL of a 5.00 ppm internal standard was diluted to 10 mL, so the concentration of the internal standard is actually 5.00 ppm / 10 = 0.500 ppm.
4.26 / C(X) = 0.663 * 2.43 / 0.500 ppm
C(X) = 4.26 * 0.500 ppm / (0.663 * 2.43)
C(X) = 1.32 ppm
Because 5 mL of the analyte solution were diluted to 10 mL, the concentration is actually 2 * 1.32 ppm = 2.64 ppm.
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what statements are always true about limiting reactants? select one or more: the limiting reactant is completely used up in the reaction. there will be an excess of other reactants at the end of the reaction. the limiting reactant is always the same for a given reaction. the limiting reactant dictates the amount of product. the limiting reactant has a lower mass than other reactants.
Answers
The correct statements are:
The limiting reactant is completely used up in the reaction.
There will be an excess of other reactants at the end of the reaction.
The limiting reactant dictates the amount of product.
Which reactant will be the limiting reactant depends on the molar ratios of all the reactants in the experiment (and the coefficients in the balanced reaction equation), so it will absolutely vary depending on the reaction setup and conditions, which is why it cannot always be the same for a given reaction.
Because the molar ratios of the reactants dictate which of them will be the limiting one, it is not true that the one with the lowest mass will always be the limiting reactant.
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please help with my chemistry homework thank you so much
Answers
Answer:
There are 2.2 moles of hydrogen.
Explanation:
The given information from the exercise is:
- Volume (V): 48.6L
- Temperature (T): 0°C (273K)
- Pressure (P): 1atm
1st) It is important to convert the temperature unit from °C to Kelvin:
[tex]0+273=273K[/tex]This first step is very important, because all the units must be at atm, L and Kelvin, before using the Ideal Gases Law formula.
2nd) Now to calculate the moles of hydrogen, we hae to replace the values of V, T and P in the Ideal Gases Law formula:
[tex]\begin{gathered} P*V=n*R*T \\ 1atm*48.6L=n*0.082\frac{atm*L}{mol*K}*273K \\ 48.6atm*L=n*22.4\frac{atm*L}{mol} \\ \frac{48.6atm}{22.4\frac{atm*L}{mol}}=n \\ 2.2moles=n \end{gathered}[/tex]R: is the gases constant, in its value is 0.082atm.L/mol.K.
So, there are 2.2 moles of hydrogen.
Which of the following sets of quantum numbers are not allowed in the hydrogen atom? For the sets of quantum numbers that are incorrect, indicate what is wrong in each set.
(a) n = 3, ℓ = 2, mℓ = 2
allowed
not allowed, n is not valid
not allowed, ℓ is not valid
not allowed, mℓ is not valid
(b) n = 4, ℓ = 3, mℓ = 4
allowed
not allowed, n is not valid
not allowed, ℓ is not valid
not allowed, mℓ is not valid
(c) n = 0, ℓ = 0, mℓ = 0
allowed
not allowed, n is not valid
not allowed, ℓ is not valid
not allowed, mℓ is not valid
(d) n = 2, ℓ = -1, mℓ = 1
allowed
not allowed, n is not valid
not allowed, ℓ is not valid
not allowed, mℓ is not valid
Answers
(a), (b), and (d) are the sets of quantum numbers that are not allowed in the hydrogen atom.
Hydrogen is a single-electronic species i.e. only one electron is accommodated in the orbital. The electronic configuration of hydrogen is 1s¹. It expresses the set of possible quantum numbers for one electron.
n = 1; ℓ = o; m = 0The range of 'ℓ' lies between '0' to 'n-1' i.e. '0' to '0'.
The range of 'm' lies between 'ℓ-1' to 'ℓ+1' i.e. '0' to '0'.
(a) n≠3; The principal quantum number representing one electron of hydrogen is '1'.
(b) n≠4; The principal quantum number representing one electron of hydrogen is '1'.
(d) n≠2; The principal quantum number representing one electron of hydrogen is '1'.
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a sample of an ideal gas at 1.00 atm and a volume of 1.52 l was placed in a weighted balloon and dropped into the ocean. as the sample descended, the water pressure compressed the balloon and reduced its volume. when the pressure had increased to 70.0 atm, what was the volume of the sample? assume that the temperature was held constant.
Answers
The volume of the balloon when the balloon descended down in the water becomes 0.0217 Liters.
We know, from the Boyle's Law,
If the temperature of a gas is kept constant, the pressure of the gas and the volume of the gas becomes inversely proportional to each other.
So, we can write,
P₁V₁ = P₂V₂
Where,
P₁ is the initial pressure of the gas,
V₁ is the initial volume of the gas,
P₂ is the final pressure of the gas,
V₂ is the final volume of the gas.
According to the given condition, the initial volume of the ideal gas was 1.52 L and the initial pressure of the gas is 1 atm and the final pressure of the gas is 70 atm while the final volume is unknown,
So,
1.52 x 1 = V₂ x 70
V₂ = 0.0217 Liters.
The final Volume of the gas is 0.0217 Liters.
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thomas edison invented the light bulb only because he experimented with thousands of different kinds of materials for a filament before he found one that worked (carbon). this shows that at the most basic level, we can solve problems through
Answers
we can solve problems through trial and error
American businessman and inventor Thomas Alva Edison. He created several innovations in the production of electric power, mass communication, sound recording, and motion pictures. Thomas Alva Edison, one of history's most well-known and prolific innovators, made significant contributions to contemporary living by creating the phonograph, motion picture camera, incandescent light bulb, and telephone as well as enhancing the telegraph and telephony. The light bulb was created by Thomas Edison, who is best recognized for this invention. Edison, a brilliant inventor, made a thousand fruitless efforts to create the light bulb. How does it feel to fail 1,000 times, a reporter asked? I didn't fail 1,000 times, Edison said in response.
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What do all waves have in common?
you can always see them
They carry energy
They absorb light
They do not carry energy
Answers
Answer:
I think it's carry energy, but I'm not sure
a drug you're investigating demonstrates >90% absorption, but it's highest unit dose does not completely dissolve in 250 ml of solvent. the biopharmaceutics classification system would identify this drug as class:
Answers
The biopharmaceutics classification system would identify this drug as class ll drug having greater than 90% absorption.
What is biopharmaceutics classification system and which class drug have more than 90% absorption?BCS biopharmaceutics classification system is a system classifying a drug substance based on its solubility.There is a certain range of PH for this solubility to follow to be validated for human doses.Now in this question is asked about highest unit dose having absorption capacity of more than 90% and what class this drug does belong to.Class - ll is the class of drug having absorption power more than 90% and its highest unit dose does not completely in 250 ml .To know more about biopharmaceutics visit:
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how to safely handle acids?
Answers
Always wear chemical splash goggles, chemical-resistant gloves and a chemical-resistant apron whenever using concentrated acids or acid solutions. Purchase dilute acids whenever possible Acid handling requires the use of latex gloves. Solvent and chemicals in miscellaneous category require the use of polythene gloves. Check the gloves for any pin-holes prior to use. Wash your hands before eating, even if gloves were used while handling the chemical.
i know it'sis a lot and it's a little messed up but can you handle it if you can and if it's right you mind giving me a brainliest?
Always wear chemical splash goggles, chemical-resistant gloves and a chemical-resistant apron whenever using concentrated acids or acid solutions
how does hybridization of atomic orbitals allow us to reconcile valence bond theory with vsepr theory? multiple select question. hybridization enables us to account for the number of singly-occupied orbitals required for bonding. hybridization enables us to predict the shapes of molecules. hybridized atomic orbitals produce new mixed orbitals that extend over the entire molecule. hybridization of atomic orbitals produces orbital shapes and spatial orientations that correlate to those predicted in vsepr theory.
Answers
Hybridization of atomic orbitals produces orbital shapes and spatial orientations that correlate to those predicted in VSEPR theory is how they are reconciled and is denoted as option D.
What is Hybridization?
This is a term in chemistry which refers to the process in which atomic orbitals mix to form a new atomic orbital. The orbital usually has a different shape and a similar energy during the mixing process.
It helps us to reconcile valence bond theory with vsepr theory by producing orbital shapes and spatial orientations that correlate to those predicted in VSEPR theory hence why option D was chosen.
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. Which of the following statements is not correct? A. Density has no units. B. Every measurement has a unit tied to it. C. Physical quantities are properties that can be measured. D. the Kelvin degree is larger than the Celsius degree.
Answers
Answer:
A because density DOES have a unit
Explanation:
a student separated the three compounds below using the acid base extraction procedure. he then followed is experiment with tlc using acetone hexanes mixture as mobile phase. what would you expect the student to see on tlc? would he run into difficulty with the tlc? explain
Answers
The student used an acid-base extraction method to isolate three compounds. In this lab, students will use solvents of different polarity (mobile phases) to determine the optimal separation of the pigments found in spinach extracts.
Mixtures are physical mixtures or additional materials that retain their inherent properties and come together in the form of a reaction, suspension, or colloid. Combinations are materials made from materials or other uniquely styled materials. It can be separated using physical methods. Examples include solutions of salt and water, mixtures of sugar and water, various gases, and air.
The mixture consists of one or more pure materials with different compositions. There are heterogeneous and homogeneous types of mixtures. Dissimilar combinations have visually distinguishable additives, while homogeneous combinations appear uniform throughout. Agglomerates are created by the mixing of two or more distinct substances in the body and can be separated from below into their original substances. A chemical reaction occurs when additional substances combine to form a completely new substance and cannot be separated back into the original substance.
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Can someone help me pls, i have like another 3 questions like this .-.
Answers
Answer:
1st box: Potential
2nd box: Electrical
3rd box: Kinetic
Explanation:
(1st box) Potential because the energy is stored and ready to act, which is definitely something desired for a battery.
(2nd box) Chemical, as discussed in the comments
(3rd box) Kinetic because the stored, potential energy is now 'acting' or 'in motion', causing it to be kinetic energy.
Answer:
Batteries store potential chemical energy
That the swith releases it into kinetic energy to light the room.
Explanation:
Energy comes in two main forms:
Kinetic energy which is energy of moving object or motion.2. Potential energy which is energy stored in object to be realesed to make effect. It can be stored in form of
Chemical energy. This can be in fuels or food taken by human body or the battery. Gravitational energy. This is due to the gravity and the force pulling the object from a height. Elastic energy. It is energy stored in rubber bands and spring balances.And there is much more....
Principle of conservation of energy says energy is not created nor destroyed but transferred from and object to another in different forms.
which compound will distill first? group of answer choices the compound with the lower density the compound with the lower boiling point the compound with the higher boiling point the compound with the higher density the compound with the lower molecular weight the compound with the higher molecular weight
Answers
Answer:
So, liquid H2 will be distilled first, after this liquid N2 will be distilled, followed by liquid O2 and liquid CO2 will be distilled last.
The compound will lower molecular weight will distill out first as it will evaporate fast.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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In photosynthesis, carbon dioxide and water are converted to glucose and oxygen. during cellular respiration glucose and oxygen are converted to carbon dioxide and water. identify the true statement about the processes of photosynthesis and cellular respiration. answer a cellular respiration only occurs in animal cells b photosynthesis only occurs in animal cells c both processes involve a chemical change d both processes involve a physical change
Answers
During cellular respiration, oxygen and glucose are converted into water and carbon dioxide. The procedure produces ATP, which is converted into energy, carbon dioxide, water, and other byproducts.
Why is it called cellular respiration?Oxygen might be either present or absent while organisms are respiring. However, the activity is essentially known as "cellular respiration" so because cell seems to "respire" by consuming molecular oxygen (as an electron acceptor) and exhaling carbon dioxide (as an end product).
What is the purpose of cellular respiration?The process by which glucose is broken down in the presence of oxygen in the mitochondria of animals (animals and plants) to release energy in the form of ATP is referred to as cellular respiration.
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How many grams of water are required to change the temperature of water from 25.0 oC to 35.0 oC when 4,000.0 joules of energy are released?
Answers
The mass of water required to change the temperature of water from 25.0°C to 35.0°C when 4,000 joules of energy are released is 95.6g.
How to calculate mass?The mass of a substance in a calorimetry procedure can be calculated by using the following formula:
Q = mc∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperatureAccording to this question, a sample of water is changed from 25.0°C to 35.0°C when 4,000 joules of energy are released. The mass of the water sample is as follows:
4000 = m × 4.184 × 10
4000 = 41.84m
m = 95.6g
Therefore, 95.6 grams is the mass of the water sample.
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name the three hardest substances that were tested. To what classes of solids do these substances belong? What general feature do these three types of solids have in common
Answers
Three hardest substances that were tested is aluminum, silicon dioxide and sucrose and the classes of solids do these substances belong is metallic type of solid and general feature do these three types of solids have in common are melting point and hardness
Hardest substance are that cannot be crushed, cut distorted or scrapped readily and the hardness of a substance is dictated by its crystalline structure which is regular and the three three hardest substances that were tested is aluminum, silicon dioxide and sucrose
Three substances classes of solid are also same the classes of solids these substances belong is metallic type of solid and general feature are also same of solids have in common are melting point and hardness metallic solid means metal is a solid in which hard in the nature shiny and smooth and so many metals are too hard
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balance this equation
___ H2 + ___ O2 → ___ H2O2
Answers
Answer:
1H2+1O2—>H2O2
Explanation:
Use the integer+1
when GPR resin is setting, it gets hot
What type of reaction is this (exothermic or endothermic) and why?
What has happened in terms of energy transfer?
Answers
When GPR resin is setting, it gets hot. The type of reaction is this (exothermic or endothermic) is endothermic reaction. In terms of energy transfer energy is absorbed from its surrounding in form of heat.
Endothermic reaction occurs when heat is absorbed by the system from surrounding. while Exothermic reaction occurs when heat is released by the system in surrounding. In endothermic reaction , the system absorbed the energy from its surrounding in the form of heat.
Thus, When GPR resin is setting, it gets hot. The type of reaction is this (exothermic or endothermic) is endothermic reaction. In terms of energy transfer energy is absorbed from its surrounding in form of heat.
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Why do we need to understand that reactions can happen at different speeds depending on the conditions?
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We need to understand that reactions can happen at different speeds depending on the conditions to develop methods for production improvement.
The rate of any chemical reaction depends upon the nature of the reacting substances. Under the same conditions , reactions that appear similar have different rates of reaction. Chemical reaction proceeds in different speeds, depend on the various factors such as type of chemical transformation , temperature and other factors. the information about the speed of reaction is useful in large scale production.
Thus, We need to understand that reactions can happen at different speeds depending on the conditions to develop methods for production improvement.
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a sample of gas occupies a volume of 70.3 ml . as it expands, it does 140.6 j of work on its surroundings at a constant pressure of 783 torr . what is the final volume of the gas?
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A sample of gas occupies a volume of 70.3 ml as it expands, it does 140.6 j of work on its surroundings at a constant pressure of 783 torr and the final volume of the gas is 11.12L
A gas is a sample of matter that conforms to the shape of a container in which it is held and acquires a uniform density inside the container and even in the presence of gravity and regardless of the amount of substance in the container
Here given data is 11.12L
V₁ = Initial volume = 70.3 ml = 0.0703ml = (1L=1000ml)
w = 140.6 J = 1.387 J = (1Latm=101.3J)
Pressure = 783 torr = 1.03 atm = (1atm=760 torr)
V₂ = final volume = ?
1.387Latm = 1.03 atm × (V₂ - 0.0703ml)
(V₂ - 0.0703ml) = 11.05
V₂ = 11.12L
The final volume of the gas is 11.12L
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