Q: Which of the following is the correct conversion for 25 kilometers per hour (km/h) to miles per hour (mi/h)?

$$25 \times \frac{1\text{ mi}}{1.609\text{ km}}$$

Q: Which equation correctly expresses the relationship for calculating the amount of heat required to raise the temperature of a substance?

$$\text{Amount of heat} = \text{mass} \times \text{specific heat} \times (T_2$ - T_1$)$$

Q: How many centimeters are in 84 inches? (Use $$1\text{ in} = 2.54\text{ cm})$$

$$84 \times 2.54 = 213.36\text{ cm}$$

Q: A sample of water is heated from 20°C to 80°C. If the mass is 100 g and the specific heat is $$1.00\text{ cal/g}^ ext{°C}$$, how much heat is required?

$$100 \times 1.00 \times (80 - 20) = 6000\text{ cal}$$

Question 1

Which of the following statements best describes a chemical change?

Accepted Answer

It occurs when substances are used up and new substances are formed with different properties.

Question 2

A student proposes that increasing the temperature of a gas will increase its volume. This statement is best classified as:

Accepted Answer

A hypothesis

Question 3

Which of the following is the correct conversion for 25 kilometers per hour (km/h) to miles per hour (mi/h)?

Accepted Answer

$$25 	imes \frac{1	ext{ mi}}{1.609	ext{ km}}$$

Question 4

Which of the following is NOT a base SI unit?

Accepted Answer

Liter (L)

Question 5

A sample of metal has a mass of 45.0 g and a volume of 15.0 mL. What is its density?

Accepted Answer

$$3.0	ext{ g/mL}$$

Question 6

Which of the following best describes the difference between kinetic and potential energy?

Accepted Answer

Kinetic energy is the energy of motion, while potential energy is stored energy.

Question 7

Which equation correctly expresses the relationship for calculating the amount of heat required to raise the temperature of a substance?

Accepted Answer

$$	ext{Amount of heat} = 	ext{mass} 	imes 	ext{specific heat} 	imes (T_2$ - T_1$)$$

Question 8

A liquid sample has a density of $$1.25	ext{ g/mL}. $$What is the mass of 200 mL of this liquid?

Accepted Answer

$$250	ext{ g}$$

Question 9

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

Accepted Answer

micro (\mu)

Question 10

A scientist measures a temperature of 25°C. What is this temperature in Kelvin?

Accepted Answer

$$25 + 273 = 298	ext{ K}$$

Question 11

Which of the following statements about gases is correct?

Accepted Answer

Gases have no definite shape or volume and are highly compressible.

Question 12

Which of the following is the correct scientific notation for 0.000000732?

Accepted Answer

$$7.32 	imes 10$$^{-7}$$

Question 13

Which of the following is the correct formula for kinetic energy?

Accepted Answer

$$KE = \frac{1}{2}mv^2$

Question 14

A solution has a specific gravity of 1.10. What is its density in g/mL if the density of water is 1.00 g/mL?

Accepted Answer

$$1.10	ext{ g/mL}$$

Question 15

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

Accepted Answer

Evaporation of water from a lake

Question 16

How many centimeters are in 84 inches? (Use $$1	ext{ in} = 2.54	ext{ cm})$$

Accepted Answer

$$84 	imes 2.54 = 213.36	ext{ cm}$$

Question 17

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

Accepted Answer

Energy can neither be created nor destroyed, only transformed.

Question 18

Which of the following is the correct unit for measuring heat in the SI system?

Accepted Answer

Joule (J)

Question 19

A sample of water is heated from 20°C to 80°C. If the mass is 100 g and the specific heat is $$1.00	ext{ cal/g}^	ext{°C}$$, how much heat is required?

Accepted Answer

$$100 	imes 1.00 	imes (80 - 20) = 6000	ext{ cal}$$

Question 20

Which of the following statements about liquids is correct?

Accepted Answer

Liquids have no definite shape but have a definite volume.

Matter, Energy, and Measurement: GOB Chemistry Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard