Question 1

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

Accepted Answer

Wood burning to form ash and carbon dioxide

Question 2

A scientist prepares $$1.25 	imes 10$$^{-1}$$ L of a buffer solution. What is this volume in milliliters (mL)?

Accepted Answer

$$125 mL$$

Question 3

Which statement best describes the Law of Conservation of Energy?

Accepted Answer

Energy can only change forms; it cannot be created or destroyed.

Question 4

Which of the following properties is an extensive property?

Accepted Answer

Mass

Question 5

A student finds the mass of a metal to be $$87.5 g. $$The volume is determined by water displacement: the water level rises from $$45.0 mL to$$ $$55.8 mL. $$What is the density of the metal in $$g/mL$$?

Accepted Answer

$$1.52 g/mL$$

Question 6

Which SI base unit is used to measure the amount of substance?

Accepted Answer

Mole

Question 7

Which of the following is a derived unit?

Accepted Answer

Gram per milliliter ($$g/mL)$$

Question 8

A sample has a mass of $$0.0047 g. $$Which metric prefix best expresses this value?

Accepted Answer

4.7 mg

Question 9

Which of the following statements about significant figures is correct?

Accepted Answer

Trailing zeros after a decimal point are significant.

Question 10

A measurement is recorded as $$54.7 mm. $$What is the uncertainty in this measurement?

Accepted Answer

$$\pm 0.1 mm$$

Question 11

Which of the following best describes the difference between accuracy and precision?

Accepted Answer

Accuracy is how close measurements are to the true value; precision is how close measurements are to each other.

Question 12

Which of the following scenarios is a physical change?

Accepted Answer

Water freezing

Question 13

A car engine converts chemical energy in gasoline to mechanical energy. Which law explains why the total energy remains constant?

Accepted Answer

Law of Conservation of Energy

Question 14

Which metric prefix represents $$10^{-9}$$?

Accepted Answer

Nano-

Question 15

A sample of liquid has a density of $$0.789 g/mL. $$What is its density in $$kg/m^3$$?

Accepted Answer

$$789$$ $$kg/m^3$

Question 16

Which of the following is NOT a physical property?

Accepted Answer

Ability to react with acid

Question 17

A scientist measures the length of a particle as $$0.00000000085 m. $$Which is the correct way to express this using a metric prefix?

Accepted Answer

$$0.85 nm$$

Question 18

When multiplying or dividing numbers, how do you determine the number of significant figures in the result?

Accepted Answer

Use the number with the fewest significant figures.

Question 19

Which of the following best explains why water is a universal solvent?

Accepted Answer

Water has a bent shape and is polar, allowing it to dissolve many substances.

Question 20

A scientist needs to report a mass of $$0.000005 g $$for a DNA extract. Which is the most appropriate way to express this value?

Accepted Answer

$$5 ng$$

Chapter 1: Units of Measurement for Physical and Chemical Change – Study Notes

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