Which highly reactive gas was probably absent from the Earth's primitive atmosphere? O2 (oxygen gas) water vapor methane carbon dioxide
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The highly reactive gas that was probably absent from the Earth's primitive atmosphere is oxygen.
The atmosphere refers to the thin layer of gas above the earth's crust. This thin layer of gases is composed of a mixture of gases. The earth's primitive form also had an atmosphere.
However, we must recall that in its primitive form the earth was mostly under reducing conditions and there was no oxygen. However, photosynthesis by plants increased the oxygen content of the earth.
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I hope that helps.
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Predict the products in the following reaction: AgNO3(aq) + Na2CrO4(aq) →
Chapter 2.4.1. The ______ energy lost by the inward movement of nickel-iron within a differentiating molten planetary body would be converted first into _______ energy and then into ______ energy. a. momentum, thermal, gravitational b. gravitational, kinetic, thermal c. thermal, momentum, kinetic d. kinetic, thermal, gravitational
After doing multiple titrations, your NaOH solution is determined to have a mean concentration value of 0.100 M. Given you are to assume your unknown acid is 75.0% KHP, how many grams of your unknown will you need to use 15.00 mL of your 0.100 M standardized NaOH
b. Water is a polar molecule.
c. The strong surface tension of water allows it to adhere to the sides of a container and actually move up tubing via capillary action.
d. Water cannot be found in other places in the universe.
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Answers
Answer: Option (c) is the correct answer.
Explanation:
According to the law of conservation of energy or matter, it is stated that energy can neither be created nor it can be destroyed. It can only be transformed from one form to another.
Same applies to the matter that matter can be transformed from one form to another.
Thus, we can conclude that during a chemical reaction both matter and energy is conserved.
Both energy and matter are conserved during a chemical reaction.
Further Explanation:
Chemical reaction
It is the process to convert one or more substances into different substances. Reactants are the substances that experience changes during chemical reactions whereas products are formed once the reaction is complete. The properties of products are usually different from those of reactants.
Law of conservation of mass:
According to this law, the mass of an isolated system can neither be created nor be destroyed in a chemical reaction. In other words, the mass of reactants will always be equal to the mass of products. The quantity of matter in any material is known as mass. The conservation of matter also holds good for chemical reactions.
Law of conservation of energy:
It states that the energy can neither be created nor be destroyed but can only be converted from one form to another.
Therefore both matter and energy are conserved during a chemical reaction.
Learn more:
- What does conserving mass mean in a chemical reaction? brainly.com/question/2093705
- Write the chemical formula of the compound: brainly.com/question/10585691
Answer details:
Grade: High School
Subject: Chemistry
Chapter: Basic concepts of chemistry
Keywords: chemical reaction, matter, mass, energy, conserved, created, destroyed, reactants, products, properties, different, isolated system.
(1) CaCO3(s) --> CaO(s) + CO2(g)
(2) 2 Mg(s) + O2(g) --> 2 MgO(s)
(3) H2O(g) --> H2O(l)
(4) CO2(g) --> CO2(s)
Answers
Answer:
Was this correct? I am pretty sure it is since you are going from a solid to a gas in the first reaction.
Explanation:
(1) CaCO3(s) --> CaO(s) + CO2(g) --- solid to solid & gas ** most entropy here
(2) 2 Mg(s) + O2(g) --> 2 MgO(s) solid & gas to a solid
(3) H2O(g) --> H2O(l) gas to a liquid
(4) CO2(g) --> CO2(s) gas to a solid
As temperature rises and a substance transforms from a solid to a liquid to a gas, entropy increases. Because they have the most flexibility to move, gases have the highest entropy values. Here the first reaction has high entropy. The correct option is 1.
The level of unpredictability in a system is known as entropy. The degree of randomness is highest when comparing the three forms of matter solid, liquid, and gas because the gas particles move freely.
(1) CaCO3(s) --> CaO(s) + CO2(g) --- solid to solid & gas - most entropy here
(2) 2 Mg(s) + O2(g) --> 2 MgO(s) solid & gas to a solid
(3) H2O(g) --> H2O(l) gas to a liquid
(4) CO2(g) --> CO2(s) gas to a solid
Thus the correct option is 1.
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(a) Balance the above redox reaction.
(b) Determine the concentration of H2O2 solution in molarity if 10.00 mL of this solution requires 20.00 mL of 1.5 M MnO4− for a complete reaction.
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Answer:
A)
B) 7.5 molar
Explanation:
A)Reduction
Oxidation
Multiplying the oxidation reaction by 5/2 and adding it to the reduction equation:
+
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B) 10 ml = 0.01 L
20 ml = 0.02 L
mol of MnO4− = molarity*volume = 1.5*0.02 = 0.03
1 mol of MnO4− reacts with 5/2 mol of H2O2, then:
mol of H2O2 = 0.03*5/2 = 0.075
molarity = mol/volume = 0.075/0.01 = 7.5 molar
B. substitution
C. decomposition
D. combination
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A chemical reaction in which two or more substances undergo a chemical union to form a more complex substance is a combination reaction.
What is a chemical reaction?
Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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Answer : The correct option is, (D) Combination
Explanation :
- Double replacement reaction : A chemical reaction in which a positive cation and a negative anion of the two reactants exchange places to give two new products or compounds.
The general representation of this reaction is,
(A and C are the cations, B and D are the anions)
- Substitution reaction : A chemical reaction in which a more reactive element displaces the least reactive element.
The general representation of this reaction is,
- Decomposition reaction : A chemical reaction in which a bigger compound breaks into two or more smaller compounds or elements.
The general representation of this reaction is,
- Combination reaction : A chemical reaction in which two or more substances react to form a more complex substance.
The general representation of this reaction is,
Hence, the correct option is, (D) Combination
Answers
PV = nRT
where P - pressure 1.46 atm x 101 325 Pa/atm = 147 934.5 Pa
V - volume
n - number of moles - 1 mol
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature - 270 K
substituting these values in the equation
147 934.5 Pa x V = 1 mol x 8.314 Jmol⁻¹K⁻¹ x 270 K
V = 15.17 L
the volume is 15.17 L