Question 1

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

Accepted Answer

Flammability of gasoline

Question 2

A student observes that when a silver spoon is left exposed to air, it gradually turns black. What type of change is this, and why?

Accepted Answer

Chemical change, because a new substance forms

Question 3

Which of the following best describes the difference between a solid and a liquid?

Accepted Answer

A solid has a fixed shape and volume, while a liquid has a variable shape but fixed volume

Question 4

Which of the following processes is a physical change?

Accepted Answer

Boiling water

Question 5

A scientist observes that when a substance is heated, it changes from a solid to a liquid. Which statement is true about this process?

Accepted Answer

It is a physical change because the composition remains the same

Question 6

Which of the following statements about energy is correct?

Accepted Answer

Energy can only be converted from one form to another

Question 7

A ball is held at the top of a hill and then released. Which statement best describes the energy transformation that occurs as the ball rolls down?

Accepted Answer

Potential energy is converted to kinetic energy

Question 8

Which of the following is the correct SI base unit for mass?

Accepted Answer

Kilogram ($$kg)$$

Question 9

Convert $$25 \, ^\circ C to $$Kelvin.

Accepted Answer

$$298 \, K$$

Question 10

Which of the following is the correct scientific notation for one millimeter?

Accepted Answer

$$1 	imes 10$$^{-3}$$ \, m$$

Question 11

A researcher observes that a metal sample is shiny, conducts electricity, and reacts slowly with air to form a green coating. Which of these is a chemical property?

Accepted Answer

Reacts slowly with air to form a green coating

Question 12

Which of the following is an example of potential energy being converted to kinetic energy in a real-world scenario?

Accepted Answer

A compressed spring being released and launching a toy car

Question 13

Which of the following is the correct order of steps in the scientific method?

Accepted Answer

Observation, Hypothesis, Experiment, Model, Further Experiment

Question 14

A student wants to measure the volume of a liquid using SI units. Which unit should they use?

Accepted Answer

Cubic meter ($$m^3)$$

Question 15

Which of the following statements about changes of state is correct?

Accepted Answer

A change of state is a physical change and is reversible

Question 16

Which of the following prefixes represents $$1 	imes 10$$^{-6}$$?

Accepted Answer

Micro ($$\mu)$$

Question 17

A cornstalk grows from a seed that is watered and fertilized. What type of change is this and why?

Accepted Answer

Chemical change, because new substances are formed during growth

Question 18

Which of the following best describes kinetic energy?

Accepted Answer

Energy due to the movement of an object

Question 19

Which of the following is a correct statement about the law of conservation of energy?

Accepted Answer

Energy can neither be created nor destroyed, only converted from one form to another

Question 20

A match ignites to form ash and a mixture of gases. Which of the following best describes this process?

Accepted Answer

Chemical change, because new substances are formed

Introduction to Chemistry: Matter, Properties, Energy, and Measurement

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