Answer:
Useful
Explanation:
Index fossils are believed to be useful in correlating rock strata from widespread locations.▸ The collection of such fossils from different rock formations and layers enables the geologists to identify the layer of rock they were found in.
▸ They are also useful in dating and the study of geological formations which help scientists to get a clear understanding of the environment and the life forms that dwelt on the planet even hundreds of millions of years ago.
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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
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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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
(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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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.
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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what type of reaction is 2 C5H5 + Fe --> Fe(C5H5)2
Answer:
Combination or Synthesis
Explanation:
It is a combination because 2 reactants are combining together to form the product.
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
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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when given the symbol Cl-37, what is the mass and charge of this symbol?mass is 37 and charge is 37mass is 17 and charge is 37mass is 0 and charge is 0mass is 37 and charge is 17
Given the symbol Cl-37, the element is Cl, but there is no information about its charge. When this is like that, it is implicit it is an atom, that is, it is neutral, its charge is 0.
The number indicates is the mass number, so its mass is 37.
So, mass is 37 and charge is 0.
Find the element that is oxidized and the one that is reduced KClO3 + 6 FeSO4 + 3 H2SO4 --> KCl + 3 Fe2(SO4)3 + 3 H2O
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.
balance this equation
___ H2 + ___ O2 → ___ H2O2
Answer:
1H2+1O2—>H2O2
Explanation:
Use the integer+1
Quantum Theory proposes electrons may
be found in orbitals, which are based on
what?
Bohr's planetary model
Thompson's Plum Pudding Model
the probability of finding an electron in an
area around the nucleus
The Heisenberg-Rutherford Model
A quantum is the smallest discrete unit of a phenomenon (plural: quanta). For instance, a photon is a quantum of light, while an electron is a quantum of electricity. Quantum is a Latin word that means "quantity" or "how much?" Anything that can be measured is something that can be quantified.
How does quantum theory connect to Bohr's model?Bohr's hypothesis, often known as quantum theory, postulated that electrons move around the nucleus according to the classical principles, but with restrictions on the orbits they can take and the energy they lose as radiation when they change orbits.
The Bohr model, also known as the Rutherford-Bohr model, was first proposed by Niels Bohr and Ernest Rutherford in 1913 and describes an atomic system with an orbiting system of electrons and a small, dense nucleus that is similar to the Solar System in structure but is attracted by electrostatic forces rather than gravity.
A small positively charged nucleus is encircled by rotating negatively charged electrons in set orbits, according to the Bohr Atomic Model. He came to the conclusion that an electron will have more energy if it is placed far from the nucleus and less energy if it is located close to the nucleus.
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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
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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Why do we need to understand that reactions can happen at different speeds depending on the conditions?
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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can someone please help me with this problem !!!!!!???????
After connecting the battery to the wire, the student brings a few pieces of iron near the iron nail. The statement which best describes what will happen to the iron pieces is that: B. The Iron nail behaves like a magnet that attracts the pieces of iron.
What is the law of magnetism?The law of magnetism states that the unlike (different) poles of a magnet would attract each other while like poles of a magnet would generally repel one another.
This ultimately implies that, two north (N) or south (S) poles of a magnet would repel one another while a north (N) and south (S) of a magnet would attract each other.
Based on the law of magnetism, we can reasonably infer and logically deduce that if this student should bring a few pieces of iron near the iron nail after connecting the battery to the wire, the iron nail would behave like a magnet by attracting the pieces of iron because they are oppositely charged.
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Complete Question:
After connecting the battery to the wire, the student brings a few pieces of iron near the iron nail. Which statement describes what will happen to the iron pieces?
answer choices
The battery behaves like a magnet that repels the pieces of iron.
The Iron nail behaves like a magnet that attracts the pieces of iron.
The iron nail produces electric current that attracts the pieces of iron.
The coil rotates which produces electric current that repels the pieces of iron.
A certain oxygen atom has the electron configuration 1s22s22px22py2. How many unpaired electrons are present?.
There are no unpaired electrons present in this atom of oxygen.
The molecular orbital configuration of the oxygen atom given is,
1s²2s²2px²2py².
As we can see, there is not electron in the configuration which is alone in the orbital, they all are present in pairs. So, there are no unpaired electrons present.
This state of the oxygen atom when there are no unpaired electron are present, this could be the ground state of the atom.
The ground state of the atom is when the potential energy of the electrons of the atom is minimum.
In this configuration, no electron is unpaired, all the electrons are paired.
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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:
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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n the laboratory you dissolve 23.4 g of manganese(ii) sulfate in a volumetric flask and add water to a total volume of 500 ml. what is the molarity of the solution?
The molarity of the solution is 0.619 M if we dissolve 23.4 g of manganese(ii) sulfate in a volumetric flask and add water to a total volume of 500 ml.
What is molarity means?The molarity is equal to the moles of a solute divided by the total number of liters in the solution. The molarity of a material quantifies its concentration in a given volume of solution.
Why do we use molarity?Molarity is the concept that describes the relationship between moles of a certain solute and the volume of the supplied solution. To calculate your molarity, you must start with moles and volumes, moles and milliliters, and mass and volumes.
Molarity formula and units
The units of molarity are M or mol/L.
Molarity equation
M = moles solute/liters solution
Molarity = number of moles of solute divided by the volume of solution in a liter
= number of moles of solute × 1000/ volume of solution in the liter
= number of moles
= Mass/ molecular weight
= 23.4/151
= 0.155moles
Molarity = 0.155× 1000/250
= 0.619 M
The concentration of manganese ion = concentration of sulphate ion = 0.619 M
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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
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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Draw the electron configuration for a neutral atom of chlorine.
The electron configuration for a neutral atom of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵.
Atomic number of Chlorine is 17. to write the electronic configuration of chlorine we need to know the number of electrons in chlorine atom. the atomic number of chlorine is 17 therefore there are 17 electrons. the first two electron enter in 1s since s can hold only 2 electrons then next two electron will enter in 2s . the next six electrons will enter in 2p since p can hold six electrons . and next two electron in 3s now reaming 5 will enter in 3p. therefore the electron configuration for a neutral atom of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵.
Thus, the electron configuration for a neutral atom of chlorine is 1s² 2s² 2p⁶ 3s² 3p⁵
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What is 11.75 millimeters in meters
Answer:
in meters its 0.01175
Explanation:
Answer:
0.01175 meters
Explanation:
. 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.
Answer:
A because density DOES have a unit
Explanation:
the molar mass of the metal hydroxide m(oh)4 is 118.97 g/mol. what is the molar mass of the sulfide of this metal? provide your answer in decimal notation, rounded to 2 decimal digits (i.e. to the hundredths place).
The molar mass of the metal Sulfide is 83.02g/mol.
The molar mass of Sulfide is the addition of molar mass of Sulphur with molar mass of given metal which is given by subtract the molar mass of hydroxide from total molar mass of metal hydroxide.
The molar mass of the [tex]M(OH)_{4}[/tex] =118.97g/mol
Molar mass of Oxygen = 15.999g/mol
Molar mass of Hydrogen= 1.008g/mol
Therefore:
molar mass of [tex]M(OH)_{4}[/tex]= (molar mass of M) +4(molar mass of oxygen + molar mass of hydrogen)
118.97=(molar mass of M)+(15.999 x4)+(1.008x4)
118.97=(molar mass of M)+(63.996+4.032)
118.97-68.028=molar mass of metal(M)
molar mass of Metal=50.942 g/mol (that is Vanadium)
Molar mass of metal + molar mass of Sulphur to give metal sulfide.
50.942+32.06=83.02g/mol
Hence, the molar mass of Vanadium Sulfide([tex]V_{2} S_{5}[/tex] ) is 83.02g/mol.
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please help ASAP! Thank you
Answer: I think it’s C
Explanation:
I think it’s C because animal cells do not have a cell wall and the cell wall is unique to plant cells
Beryllium, the first element in group 2, has an atomic number of 4. The second element in this group has an atomic number of.
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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What do all waves have in common?
you can always see them
They carry energy
They absorb light
They do not carry energy
Answer:
I think it's carry energy, but I'm not sure
A baseball catcher puts on an exhibition by catching a 0.15 kg ball dropped from a helicopter at a height of 101 m. What is the speed of the ball just before it hits the catchers glove 1.0 m above the ground?
Beryllium, the first element in group 2, has an atomic number of 4. The second element in this group has an atomic number of?.
Beryllium exists in Group 2 (Column 2) with the atomic number 4.
The atomic number of the next element in the group would be right below it, Magnesium (Mg). Magnesium contains the atomic number 12.
What is meant by atomic number?The charge number of an atomic nucleus is the chemical element's atomic number, also known as nuclear charge number. This is the number of protons present in the nucleus of each atom of that element, or the proton number, for conventional nuclei. Ordinary chemical elements can be uniquely identified by their atomic number.
The number of protons in an atom determines its atomic number, and isotopes have the same atomic number but different numbers of neutrons.
Beryllium exists in Group 2 (Column 2) with the atomic number 4.
The atomic number of the next element in the group would be right below it, Magnesium (Mg). Magnesium contains the atomic number 12.
The atomic number is the small number on the top left corner of the square of the element.
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Fatty acids that are broken down for energy production are utilized for which aspects of cellular respiration? choose all that apply.
Fatty acids that are broken down for energy productions are utilized for glycolysis.
What is glycolysis?Although the multiple choices are missing, you might be referring to these multiple choices: (a) Fermentation, (b) Glycolysis, (c) Pyruvate oxidation, (d) Citric acid cycle, (e) Electron transport chain. In that case, the correct answer is (b) Glycolysis.
Glycolysis refers to the breakdown of glucose or sugar (C₆H₁₂O₆), releasing energy and pyruvate (CH₃COCO₂H). Glycolysis is the first stage in the process of cellular respiration in organisms. Cells use glycolysis as a method to produce energy. Glycolysis is found in the great majority of organisms alive today.
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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.
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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Conservation in a reaction means that the number of each type of atom is equal on each side of the arrow. This is a _____
Answer: There is equal number of each type of atom on the reactant and product side.
Explanation:
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
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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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.
Answer:
need the free questions srry yall
Explanation: