The release of O₂( oxygen gas) from the process of photosynthesis is made disks to be able to float.
What is Photosynthesis?Photosynthesis can be described as the process in which green plants manufacture their food in the presence of sunlight which is trapped by the chlorophyll of the leaves. They are also called primary producers and they use compounds such as water and carbon dioxide.
The spinach leaf disks intake carbon dioxide from a sodium bicarbonate solution and sink to the bottom of a beaker. When the beaker is exposed to light, the disks use carbon dioxide gas and water to produce oxygen gas and glucose. Oxygen gas released from the leaves due to photosynthesis forms tiny bubbles that make the leaves float.
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if 250 ml of a 0.0193 m cacl2 solution is prepared, how many moles of cacl2 would 25 ml of this solution contain? a. 0.0193 moles b. 0.00193 moles c. 4.83x10-3 moles d. 4.83x10-4 moles
25 ml of the solution contains 4.83 x 10⁻⁴ moles of CaCl₂.
Concentration, or the amount of solute in a solution, can either be expressed in molarity, M, moles of solute per liter of solution, or molality, m, moles of solute per kilogram of solution.
The concentration of the CaCl₂ solution is 0.0193 M.
Hence, there are 0.0193 moles of CaCl₂ per liter of the solution.
M = 0.0193 M
volume of solution = 25 ml
Multiply the volume by the concentration to get the number of moles.
M = moles of solute / volume of solution
moles of solute = M (volume of solution)
moles of solute = 0.0193 M(25 ml)(1 L / 1000 ml)
moles of solute = 4.83 x 10⁻⁴
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What is the mass of calcium oxide produced in the reaction?
Answer:
From the reaction stoichiometry, 2 moles of Ca produces 2 moles of CaO. Thus, the number of moles of Ca is the same as that of CaO. Therefore, n = 0.16892 mol for CaO. Hence, 9.47 grams of calcium oxide are produced.boron has two naturally occurring isotopes: boron-10 (abundance 19.8%, mass 10.013 amu), boron-11 (abundance 80.2%, mass 11.009 amu). calculate the atomic mass of boron.
Answer:
Atomic mass of Boron: 10.8 amu
Explanation:
Boron-10: (0.198)(10.013) = 1.98 amu
Boron-11: (0.802)(11.009) = 8.83 amu
Add them up: 1.98+8.83= 10.8 amu
Explain the difference between the first and second ionization energy of an element.
The difference between the first and second ionization energy of an element is second ionization energy is larger than first ionization energy.
Ionization energy is the energy required to remove the electron . First ionization energy is the amount of energy required to remove the electron from neutral atom such as M. while second ionization energy is the amount of energy required to remove electron from positively charged ion such as M⁺.
first ionization energy is given as :
M ---> M⁺ + e⁻ , IE1
second ionization energy is given as :
M⁺ ----> M²⁺ + e⁻ , IE2
Thus, The difference between the first and second ionization energy of an element is second ionization energy is larger than first ionization energy.
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20 points for answer: D=m/v. Mass=30g and Volume=6mL
Answer:
density = 5 g/ml
Explanation:
D=m/v. Mass=30g and Volume=6mL
SO solve for D when m = 30 and v = 6
D=m/v
D = 30/6
density = 5 g/ml
key questions 1. what distinguishes each of the four examples in illustrating the methodology? 2. why might it be necessary to put double or even triple bonds between atoms in constructing lewis structures? 3. how does the lewis structure help you identify the length of bonds in a molecule? 4. how is formal charge determined, and how is it used in identifying reasonable lewis structures? 5. in the above examples illustrating the methodology, why are relevant resonant structures - present only in the case of no2 ?
An atom's Lewis structure enables you to predict its bonding patterns and number of bonds. We may ultimately be able to comprehend the structures of molecules & their chemical characteristics using this information.
2. The stability of the molecule increases with the number of charges on each element. In order to reduce the number of different formal charges, a double or triple bond should be applied.
3. Dots are used in the Lewis structure to depict the shared electrons between atoms. Next, ascertain whether there is a single, triple, or triple covalent connection between the two atoms. Third, determine the radius of each of the bonded ions based on the type of bond by using an atom radius chart.
4. By considering each bond as if one-half of the electrons were allocated to each atom in a Lewis structure, formal charges can be ascribed to each atom. These fictitious formal charges serve as a reference for selecting the best Lewis structure.
5. N-O bond as well as a double bond. The N atom possesses a positive charge and an unpaired electron. They are the two principal resonance sources of NO2.
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What discovery proved Mendeleev's periodic table to be correct and Newlands' to be
wrong?
The discovery of protons and isotopes
The discovery of oxygen and nitrogen
The discovery of electron shells
The discovery of atomic weight
0/1
Answer: The discovery of protons and isotopes
Explanation: Mendeleev's arrangement by changing the criteria by which elements were arranged and assigned atomic numbers. Mendeleev arranged the periodic table based on the atomic mass of an atom of an element and its chemical properties.
what is the ph of a strontium hydroxide solution obtained by dissolving 0.17 grams of strontium hydroxide in enough water to obtain 670. ml of solution? insert your answer in decimal notation, rounded to 2 decimal digits.
The pH of a strontium hydroxide was obtained by dissolving 0.17 grams of strontium hydroxide in enough water to obtain 670. ml of solution is 3.6.
What is pH?The range of pH goes from 0 to 14, with 7 acting as neutral. A pH value of 7 or less denotes acidity, while a pH value of 7 or more denotes baseness. The amount of free hydrogen and hydroxyl ions present in the solution is what determines the pH of water.
Molarity of strontium hydroxide = mass/volume
Molarity of strontium hydroxide = 0.17/670
Molarity of strontium hydroxide = 0.000253 = 2.53 × 10⁻⁴
pH = - log [strontium hydroxide]
pH = -log [2.53 × 10⁻⁴]
pH = 3.59
pH = 3.6
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calculate the vapor pressure of a solution of 0.300 mol fraction of toluene and 0.700 mol fraction of cyclohexane at 32oc and determine whether the solution will boil. the vapor pressure of pure toluene is 40.2 torr and that of cyclohexane is 125 torr at 32oc
The Vapour pressure of the solution is 99.56 torr
The saturated vapour pressure of the solution maybe lower then the pressure of pure solvent in solution. It is equal to the vapour pressure of the pure solvent at the same temperature scaled by mole fraction of solvent stated by Rault's Law.
P(solution) = mol fraction of solvent × P° ( solvent)
given, pressure of pure toulene = 40.2 torr
pressure of pure cyclohexane = 125 torr
∴ P (solution) = 0.3 × 40.2 + 0.7 × 125
P (solution) = 99.56 torr
hence, vapour pressure is calculated to be 99.56 torr.
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help me out please and thank you
The metals that are able to displace iron sulfate from solution are magnesium and aluminum.
What is the electrochemical series?The electrochemical series is a series that shows the reactivity of the metals. We must note that the order of the reactivity of the metals depends on the electrode potential of the metal. The metals that have a higher electrode potential would tend to react better and faster.
Also note that, the metals that are higher in the electrochemical series are able to displace the metals that are lower in the series from their aqueous solutions. This implies that if we add a metal to a solution that contains a meta that is lower in the electrochemical series, the lower meta is discharged from solution.
As we can see, when we add each of these metals to the iron sulfate solution, the only time that we would be able to have a reaction is when we add the aluminum or the magnesium metals.
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how many possible monobromination products of butane are there? include minor product(s) not just the major product(s). if a product exists as a pair of enantiomers be sure to count both enantiomers as a distinct product.
Possible monobromination products of butane are 3.
What is a monobromination?Monobromination as defined by medicine:
an organic molecule is given one bromine atom by the addition process.
In a chemical process known as bromination, a compound is subjected to bromination, which adds bromine to the substance. Following bromination, the result will possess traits distinct from the initial reactant.
Any reaction or process known as bromination entails the introduction of bromine into a molecule alone. Alkene bromination with the electrophilic addition of Br₂. electrophilic aromatic substitution-based bromination of a benzene ring. Benzylic position bromination using a free radical substitution process.
By way of the reaction, a total of three monobrominated compounds will be produced.
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Convert 11.75 millimeters to meters.
Answer: 0.01175
Explanation:
While traveling, an airplane passenger placed a bag of potato chips in his checked luggage that was placed in the baggage compartment where the air was not regulated. When he opened the luggage after landing, the bag had exploded and potato chips were everywhere in his luggage. Which gas law does this describe?.
Flammable liquids and solids, such as lighter refills, lighter fuel, matches, paints, thinners, fire-lighters, lighters that must be inverted before ignition, matches (these may be carried on the person), radioactive material, briefcases, and attach cases with alarm devices installed.
Food items larger than 3.4 oz are not permitted in carry-on bags and should be stored in checked bags if possible. Food, powders, and other materials that can clog bags and obstruct clear images on the X-ray machine may be instructed to be separated from carry-on bags by TSA officers. Most passengers are permitted to bring one full-size carry-on bag and one personal item for free on their flight. There are some exceptions, such as customers traveling on Basic Economy tickets.
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Answer:
Explanation:
Boyle's law was used when a traveller on a plane packed a bag of potato chips in his checked luggage and put it in the unventilated baggage hold. When the passenger opened the bag after landing, the bag exploded, and there were chips all over his luggage.
Why is Boyle’s law applicable to the airplane passenger?
Let's have a look at the link between pressure and height to better understand how the answer was arrived at.
Altitude increases cause a drop in pressure.
A particular surface has fewer air molecules above it at higher elevations than it does at lower elevations.
This indicates that the pressure is high at ground level and low at the airspace through which an airplane passes.
The gas in the sealed bag of potato chips had expanded, causing the bag to explode.
Given that it demonstrates the relationship between volume and pressure, this circumstance serves as an illustration of Boyle's law.
Basically, Boyle's law states that when pressure lowers, volume rises and vice versa.
What does Boyle’s law state?
If the temperature and amount of gas remain constant in a closed system, the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies.
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The ground pigment in which painting material combines with a linseed oil vehicle and turpentine medium?.
Fresco is the ground pigment in which painting material combines with a linseed oil vehicle and turpentine medium.
Fresco is a type of ancient painting where color is applied to a wet lime plaster surface while being suspended in alkaline limewater. Fresco is not to be confused with a patina layer that is put on dried plaster or limewash. They are known as Secco applications. Fresco must be applied while the plaster is still damp and is only intended for use on pure lime plaster.
It cannot be applied to plaster that has dried, cement, lime with cement, or lime stucco (also referred to as lime stucco). The coloured limewater will carbonate with the wet plaster throughout the curing process after being applied to it, becoming a permanent part of the lime plaster surface. Fresco as a painting material can be utilized inside or outside.
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What element is this? I am a yellowish gas with seven valence electrons that can kill. I am often used in disinfectants but never makes me with ammonia or you will get some nasty gases that can harm you.
The element that forms a yellowish gas, often used as a disinfectant, and forms a nasty gas with ammonia would be chlorine.
Properties of chlorineChlorine is an element with a valence electron of 7. It forms a greenish-yellow gas that is 2 to 5 times denser than air. The element belongs to a group of elements on the periodic table known as halogen.
Chlorine is used as a disinfectant. It is utilized in the treatment of water for domestic use. It has the ability to kill harmful microbes off surfaces. It is also used in the manufacturing of textile products, paper bleaching, and several other industrial uses.
Chemically, chlorine is highly reactive. It reacts with ammonia to form a toxic gas known as chloramine. The gas affects the throat, lungs, and eyes of humans and in high doses, can cause outright death.
Thus, the element in question that form yellowish gas, is used as a disinfectant, and forms nasty gas with ammonia would be chlorine.
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how many formula units are there in 212 grams of mgCl2
Formula units are there in 212 grams of MgCl₂ are 830.56
Formula is the empirical of any ionic or covalent network solid compound used as an independent entity for stoichiometric calculations and it is the lowest whole number ratio of ions represented in an ionic compound
Here given data is
MgCl₂ = 212 grams
1 mole of magnesium chloride has mass = 95.211 gram and contains 6.022×10²³formula units of magnesium chloride
Here 212 grams×6.022×10²³form unit of MgCl₂/95.211 gram = 830.56
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I have four questions:
1- what can you say about the number of protons in these three metals as you look down in the group. (lithium, sodium, and potassium.)
2- what can you say about the mass number of the three metals.(lithium, sodium, and potassium.)
3- what is similar about the structures of an atom of lithium and an atom of sodium?
4- what is similar about the structures of lithium sodium and potassium?
The number of protons in lithium is 3, in sodium is 11 and in potassium is 19 whereas the mass number of lithium is 6.941 u, the mass number of sodium is 22.989769 u and the mass number of potassium is 39.0983 u.
What is the mass number of lithium, sodium, and potassium?Numbers of Protons:
The total number of protons in lithium is 3.
The total number of protons in sodium is 11.
The total number of protons in potassium is 19.
Mass Number:
The mass number of lithium is 6.941 u.
The mass number of sodium is 22.989769 u.
The mass number of potassium is 39.0983 u.
Structure of Lithium and Potassium:
Lithium and potassium have a similarity in them that they all have one electron in their outermost orbit.
Structure of Sodium and Potassium:
Sodium and potassium have a similarity in them that they all have one electron in their outermost orbit.
So we can conclude that the number of protons in lithium is 3, in sodium is 11 and in potassium is 19.
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When sodium reacts with water.........gas evolves
(O2-CO2-H2-N2)
When sodium reacts with water, hydrogen gas evolves (option C).
What is a chemical reaction?A chemical reaction is a reaction that typically involves the breaking or making of interatomic bonds, in which one or more substances are changed into others.
A chemical reaction combines two or more substances called reactants to form new substances called products.
According to this question, sodium (Na) reacts with water (H2O) as follows:
2Na + 2H₂O → 2NaOH + H₂
As observed in the above chemical reaction, sodium metal reacts with water to produce sodium hydroxide and hydrogen gas.
Therefore, it can be said that hydrogen gas is evolved when sodium combines chemically with water.
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a 1.0857g sample of a compound containing only carbon, hydrogen, and oxygen was burned in excess oxygen gas. 3.190g of co2 and 0.9360g of h2o were produced. find the empirical formula of the compound
The empirical formula of the compound is C3H4O as the mole ratio is 3 : 4 : 1
1) Mass of carbon (C) in 3.190 g of carbon dioxide (CO₂)
atomic mass of C: 12.0107 g/mol
molar mass of CO₂: 44.01 g/mol
Setting up proportion as:
12.0107 g of C / 44.01 g of CO₂ = x / 3.190 g of CO₂
x = 0.87057 g of C
2) Mass of hydrogen (H) in 0.9360 g of water (H₂O)
atomic mass of H: 1.00784 g/mol
molar mass of H₂O: 18.01528 g/mol
Setting up proportion as:
2 × 1.00784 g of H / 18.01528 g of H₂O = x / 0.9360 g of H₂O
x = 0.10472 g of H
3) Mass of oxygen (O) in 1.0857 g of pure sample
Mass of O = mass of pure sample - mass of C - mass of H
Mass of O = 0.38397 g O ≈ 0.3840 g
4) Mole calculations
C: 0.87057 g / 12.0107 g/mol = 0.07248 mol
H: 0.10472 g / 1.00784 g/mol = 0.10390 mol
O: 0.3840 g / 15.999 g/mol = 0.02400 mol
So, to find empirical formula the mole ratios are:
C: 3
H: 4
O: 1
Thus the mole ratio is 3 : 4 : 1, and the empirical formula is: C3 H4 O
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Density of 85mL of water
Since water served as the foundation for creating the metric system of measurement, density is defined as mass divided by volume (=m/v), meaning that one cubic centimeter (1cm3) of water weighs one gram (1g).
The density of pure water is what.The density of water is typically expressed in terms of grams per milliliter (1 g/ml) or grams per cubic centimeter (1 g/cm3).
85-milliliter outcome
2.988 Ounces
0.1868 Pounds
84.719 Grames
0.0847 Kilograms
Weight at 80°F(26.7°c)
As the temperature drops, the water becomes denser. Water density reaches its maximum at 4 degrees Celsius.
Like a solid, a liquid's density is determined by dividing its mass by its volume, or D = m/v. Water has an average density of one gram per cubic centimeter. No matter the size of the sample, a substance has a constant density.
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2. a. In general, how do the periodic properties of
the d-block elements compare with those of
the main-group elements?
b. Explain the comparison made in (a).
3. For each main-group element, what is the
relationship between its group number and
the number of valence electrons that the group
members have?
I will give Brainkist
The d block elements differ from the main group elements in the nature of the ions that they form. Also, the group number is related to the number of electrons in the valence sell of an atom.
What are the d block elements?The D block elements are those elements that are found to have d orbitals as the orbitals that has the highest energy in the atom. The d block elements are called the transition metals and they have an incompletely filled d - level.
Owing to the fact that d - level is incompletely filled they do exhibit variable oxidation states and are colored. On the other hand, the main group elements do not exhibit a variable oxidation states and the ions that they form are not colored.
Secondly, for each of the main group elements, the group number shows the number of valence electrons that are present in the outermost shell of the atoms in the elements of the groups.
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Decomposers in the rainforest ___________ break down materials.
A:A. slowly
B:B. do not
C:C. quickly
D:D. rarely
Answer:
Quickly
Explanation:
An unknown object has a mass of 125 grams. It is then added to a graduated cylinder filled with 55.0 mL of water. After being submerged, the water
level increases to 66.0 mL. What is the density of the object?
According to the given statement is 11.36 g/ml is the density of the object.
What is density of an object?The proportion of an object's mass to its volume has been its density. The unit of density is frequently grams per cubic centimeter (g/cm3). Keep in mind that the volume is measured in cubic centimeters, not grams (the same volume as 1 millilitre). More particles will make a box denser than fewer particles in the same box.
What many density are there?Absolute density and relative density are the two main types of density. Relative density, also known as specific gravity, is the proportion of a product's density to the density of a reference material.
Briefing:Mass = 125 g
Initial Volume =55.0 mL
Final Volume = 66.0 mL
Volume = 66.0mL - 55.0mL
Volume= 11.0 mL
ρ = m/v
ρ = 125/11
ρ = 11.36 g/ml.
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The half life for the decay of radium is 1620 years. What is the rate constant for this first-order process?.
The rate constant of the Decay of Radium with half life of 1620 years is 0.0004277/year.
We know, every radioactive reaction is a first order reaction.
So, it will follow the first order kinetics.
The half life of the radium sample is 1620 years.
We know, the standard formula for the half life of the first order reaction is,
T = 0.693/K
Where,
T is the half life of the reaction,
L is the rate constant of the reaction.
It is given that the half life of the reaction is 1620 years, so, putting all the values,
T = 0.693/K
K = 0.693/1620
K = 0.0004277/year.
So, the rate constant of the decay of radium is 0.0004277/year.
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a major component of gasoline is octane . when octane is burned in air, it chemically reacts with oxygen gas to produce carbon dioxide and water . what mass of carbon dioxide is produced by the reaction of of octane?
8.70 g of carbon dioxide are generated by the reaction of octane.
Let's compile all the data in one location since we are aware that we will require a balanced equation with masses and molar masses.
M_r: 32.00 44.01
2C₈H₁₈ + 25O₂ ⟶ 16CO₂ + 18H₂O
m/g: 9.88
(a) Calculate the moles of O₂
n = 9.88 g O₂ ×1 mol O₂ /32.00 g O₂
n = 0.3088 mol O₂.
(b) Calculate the moles of CO₂
(16 mol CO2 to 25 mol O2) is the molar ratio.
n = 0.3088 mol O₂ × (16 mol CO₂/25 mol O₂)
n = 0.1976 mol CO₂
(c) Calculate the mass of CO₂
Mass of CO₂ = 0.1976 mol CO₂ × (44.01 g CO₂/1 mol CO₂)
Mass of CO₂ = 8.70 g CO₂
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Density is defined as
Responses
A volume/massvolume/mass
B length to mass ratiolength to mass ratio
C mass to length ratiomass to length ratio
D mass/volumemass
Answer:
D. Density is defined as mass/volume.
Measuring Liquid Volume Pre-Lab worksheet
1. The longer distance for each choice is:
1 mile1 meter1 inch2. The complete statements are as follows;
1 mi = 1.6 km1 yd = 0.9444 m1 in = 2.54 cm3. The basic unit of length in the metric system is the meter and is represented by a lowercase m.
4. The meter is defined as the distance traveled by light in absolute vacuum in 1⁄299,792,458 of a second.
5. The values that complete each statement is given below:
1 km = 1000 m1 m = 100 cm1 m = 1000 mm6. The larger value for each option is:
A. 105 centimetersB. 4400 metersC. 12 centimetersD. 1200 millimeters7. The number of millimeters in 1 centimeter is 10 mm
8. Using the ruler and line, the answers are:
2.8 cm29 mm3 cmWhat is the unit for measuring distance in the metric system?The unit for measuring distance in the metric system is the meter. Smaller and larger values of the meter are also used such as millimeters, centimeters, kilometers, etc.
Other units for measuring distance include yards, miles, and inches.
The various units for measuring distance can also be interconverted using their conversion factors.
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Help me please!
The pressure of 6.0 L of an ideal gas in a flexible container is decreased to one third of its original pressure and its absolute temperature is decreased by one half. What is the final volume of the gas?
The final volume of the ideal gas in a flexible container will be 9.0 L.
Let:
'P', 'V', and 'T' be the initial pressure, volume, and temperature of the ideal gas respectively'X' be the final volume of the ideal gasIdeal-gas Equation establishes a relation between pressures, volumes, and temperatures of different conditions.
Using the Ideal-Gas Equation:
PV = nRT
Ideal-Gas Equation for initial conditions will be:
PV = nRT.....................................................(i)
Ideal-Gas Equation for final conditions will be:
(P/3)X = nR(T/2)........................................(ii)
On dividing equations (i) and (ii):
PV = nRT / (P/3)X = nR(T/2)
3V/X = 2
X = 3V/2
Putting the value of V = 6L:
X = 3(6L)/2 = 9L
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The heating curve shows the energy gain of a substance as it changes from solid to gas. Which section of the graph shows the liquid phase of the
substance gaining kinetic energy?
A. A
B. B
C. C
D. D
E. E
The heating curve is a graphical representation of how various phases of substances change as temperature or heat increases. The graph's C section depicts the liquid phase of the substance gaining kinetic energy.
What is kinetic energy?Kinetic energy is the energy that an object has as a result of its movement. If we want to accelerate an object, we must apply force to it. Using force requires us to put in effort. When the work is finished, energy is transferred to the object, and it moves at a new constant speed.
Therefore,
Section A represents the solid phase
Section B the solid-liquid phase
Section C the liquid phase
Section D the liquid-gas phase
Section E the gas phase
Section C of the graph depicts the substance's liquid phase gaining kinetic energy. Heat energy is absorbed during Phase C, and liquid particles gain kinetic energy to change into gas form in Section E.
As a result, C.C. is the correct answer.
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What best describes a solution after it has cooled
Answer: A supersaturated