AnswersCR03101 ChemistryCumulative Exam

Cumulative Exam — Cumulative exam Answers

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Consider the diagram.Which postulate of the kinetic-molecular theory best describes the event in the diagram?

Question illustration
A
Most of the volume of a gas is empty space.
B
All collisions between particles are perfectly elastic.
C
There is no force of attraction or repulsion between gas particles.
D
The average kinetic energy of particles depends only on temperature.
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Consider the balanced equation below.N2H4 + 2H2O2 N2 + 4H2OWhat are the mole ratios of hydrazine (N2H4) to hydrogen peroxide (H2O2) and hydrazine to water?

Question illustration
A
1:2 and 1:4
B
1:3 and 1:4
C
1:2 and 3:5
D
1:3 and 3:5
43

Consider the reaction below.2C6H14 + 19O2 12CO2 + 14H2OHow many moles of hexane (C6H14) must burn to form 18.4 mol of carbon dioxide?

Question illustration
A
1.53 mol
B
3.07 mol
C
110. mol
D
175. mol
44

How does heat differ from temperature?

A
Temperature is the measure of heat.
B
Temperature and heat are the same thing.
C
Temperature measures thermal energy, and heat is the flow of thermal energy.
D
Temperature measures the loss of energy, and heat measures the gain of energy.
45

During photosynthesis, sunlight shining on a plant is absorbed. Through several chemical reactions, the plant produces sugar, a high-energy compound, from simpler substances. What energy transformation occurs during this process?

A
thermal energy to chemical energy
B
electromagnetic energy to chemical energy
C
kinetic energy to potential energy
D
potential energy to chemical energy
46

A sample of water is taken and kept in a beaker in a freezer at a constant temperature of 0°C. If the system is at dynamic equilibrium, which of these statements is true?

A
The rate of freezing is equal to the rate of melting.
B
The rate of freezing is greater than the rate of melting.
C
The amount of ice is greater than the amount of water.
D
The amount of ice is equal to the amount of water.
47

The periodic table below shows the electronegativity values of some elements.ElectronegativitiesConsider the positions of barium (Ba), sulfur (S), silicon (Si), and calcium (Ca) on the periodic table. The atoms of which element require the least amount of energy to give up an electron when forming chemical bonds?

Question illustration
A
barium
B
sulfur
C
silicon
D
calcium
48

A solar panel combines multiple photovoltaic cells. Which type of energy is used to power a solar panel?

A
kinetic energy
B
thermal energy
C
electromagnetic energy
D
gravitational potential energy
49

Lillian multiplies two numbers as follows: A B = C. Given that A has five significant figures and two decimal places and B has six significant figures and four decimal places, which equals the number of significant figures in C?

Question illustration
A
two
B
four
C
five
D
six
50

Which is a characteristic of nuclear fission?

A
releases nonradioactive waste only
B
involves the collision of two nuclei
C
releases small amounts of energy compared to fossil fuels
D
involves the splitting of an atom into two or more fragments

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