GCHM Unit 3 Review
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20 Terms
A chemical equation is balanced when
the number of atoms of each element is the same in reactants and products.
In a _________ reaction, two or more elements or compounds form one product.
combination
What is the classification for this reaction?
combination
Which of the following describes an oxidation reaction?
loss of electrons or gain of oxygen
In an oxidation-reduction reaction, the substance reduced always
experiences a gain of electrons
One mole of particles of any substance contains how many particles?
6.02 × 10²³
Avogadro's number is the number of
particles in 1 mole of a substance
The molar mass of potassium is
39.1 g
Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O₂ reacted to the number of moles of Fe₂O₃ produced? (denominator / numerator)
3 moles of O₂ / 2 moles of Fe₂O₃
In an endothermic reaction,
energy is absorbed by the system.
The ________ is the energy difference between reactants and products in a chemical reaction.
heat of reaction or ΔH
A reaction that releases energy as it occurs is classified as a(n)
exothermic reaction
According to the kinetic theory of gases, a gas can be compressed much more than a liquid or solid because
the particles of a gas are very far apart
According to the kinetic molecular theory of gas behavior, particles of a gas tend to move ________ in _______.
rapidly; straight paths
The force of the collisions of gas particles against the walls of a container is called
pressure
Use the following diagram to answer this question.
The balloon is put into a chamber whose pressure is less than the atmospheric pressure and at atmospheric temperature.
C
Use the following diagram to answer this question.
The temperature is changed from 50℃ to -150℃ at constant pressure.
A
Vapor pressure can be described as
the pressure exerted by a gas above the surface of its liquid
The total pressure in a mixture of gases is equal to the partial pressure(s) of
all the gases added together
At STP, what is the volume of 1.00 mole of carbon dioxide?
22.4 L