Question 1

Which of the following is an example of a chemical change?

Accepted Answer

Iron rusting when exposed to air

Question 2

Which property is a chemical property of gasoline?

Accepted Answer

Its flammability

Question 3

A student heats a sample of ice until it melts and then boils. Which of the following best describes the changes that occur?

Accepted Answer

Both melting and boiling are physical changes

Question 4

Which of the following best describes the law of conservation of energy?

Accepted Answer

Energy is neither created nor destroyed, only transformed

Question 5

Which of the following is a physical property?

Accepted Answer

Melting point

Question 6

When gasoline combusts in a car engine, which forms of energy are involved in moving the car?

Accepted Answer

Chemical energy is converted to kinetic and thermal energy

Question 7

Which equation correctly represents the chemical change when iron rusts?

Accepted Answer

$$4 \mathrm{Fe} + 3 \mathrm{O}_2 \rightarrow 2 \mathrm{Fe}_2\mathrm{O}_3$$

Question 8

Which of the following best describes potential energy?

Accepted Answer

Energy associated with an object's position

Question 9

A student adds 2.345, 0.07, and 2.9975. What is the sum rounded to the correct number of significant figures?

Accepted Answer

$$5.41$$

Question 10

Which of the following is NOT a physical property?

Accepted Answer

Toxicity

Question 11

Which scenario best illustrates a physical change?

Accepted Answer

Dissolving salt in water

Question 12

Why do systems with high potential energy tend to change?

Accepted Answer

To release energy and become more stable

Question 13

Which of the following is an example of energy absorption in a chemical process?

Accepted Answer

Photosynthesis in plants

Question 14

A sample of gasoline is burned in air. Which statement best describes the energy changes?

Accepted Answer

Potential energy in gasoline is converted to kinetic, thermal, and other forms of energy

Question 15

Which of the following is a chemical property of a substance?

Accepted Answer

Reactivity with oxygen

Question 16

Which of the following best describes thermal energy?

Accepted Answer

Energy associated with temperature and heat

Question 17

A student calculates $$5.9 - 0.221. $$What is the answer rounded to the correct number of significant figures?

Accepted Answer

$$5.7$$

Question 18

Which of the following is NOT a chemical change?

Accepted Answer

Melting ice

Question 19

Which of the following best describes kinetic energy?

Accepted Answer

Energy associated with an object's motion

Question 20

Which of the following is a real-life example of a physical property being observed?

Accepted Answer

A piece of copper wire conducting electricity

Matter, Measurement, and Problem Solving: Physical & Chemical Changes, Properties, and Energy

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