Q: Convert 212.0 kilocalories to joules using the conversion $$1 \text{ calorie} = 4.184 \text{ J}.$$

$$212.0 \times 1000 \times 4.184 = 887,008 \text{ J}$$

Q: A 100 g block of chromium absorbs 400 J of heat. If the specific heat of chromium is $$0.449 \text{ J/g} \cdot ^\circ\text{C}$$, what is the temperature change ($$\Delta T$$)?

$$\Delta T = \frac{400}{100 \times 0.449} = 8.9^\circ\text{C}$$

Q: Which of the following is a correct temperature conversion from $$25^\circ\text{C} to $$Kelvin?

$$25 + 273.15 = 298.15 \text{ K}$$

Q: Which of the following is the correct formula for calculating heat ($$q) $$absorbed or released by a substance?

$$q = m \times c \times \Delta T$$

Question 1

Which of the following best describes a chemical change?

Accepted Answer

A process where a substance is transformed into a new substance with a different identity.

Question 2

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

Accepted Answer

Melting of ice into water.

Question 3

A student separates a mixture of iron filings and sulfur using a magnet. What type of separation is this?

Accepted Answer

Physical separation

Question 4

Which of the following is a pure substance?

Accepted Answer

Gold

Question 5

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture that looks the same throughout, no matter where you sample it.

Question 6

Which of the following is an example of a compound?

Accepted Answer

Ice (solid $$H_2O)$$

Question 7

Which of the following is NOT evidence of a chemical change?

Accepted Answer

Melting of a solid

Question 8

A sample of salad dressing separates into layers after sitting for a while. How should this matter be classified?

Accepted Answer

Heterogeneous mixture

Question 9

Which of the following statements about energy is correct?

Accepted Answer

Energy is the capacity to supply heat or do work.

Question 10

Convert 212.0 kilocalories to joules using the conversion $$1 	ext{ calorie} = 4.184 	ext{ J}.$$

Accepted Answer

$$212.0 	imes 1000 	imes 4.184 = 887,008 	ext{ J}$$

Question 11

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

Accepted Answer

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

Question 12

A 100 g block of chromium absorbs 400 J of heat. If the specific heat of chromium is $$0.449 	ext{ J/g} \cdot ^\circ	ext{C}$$, what is the temperature change ($$\Delta T$$)?

Accepted Answer

$$\Delta T = \frac{400}{100 	imes 0.449} = 8.9^\circ	ext{C}$$

Question 13

Which of the following best describes a solid?

Accepted Answer

Definite shape and definite volume

Question 14

Which of the following is a correct temperature conversion from $$25^\circ	ext{C} to $$Kelvin?

Accepted Answer

$$25 + 273.15 = 298.15 	ext{ K}$$

Question 15

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Salad dressing

Question 16

Which of the following is the correct formula for calculating heat ($$q) $$absorbed or released by a substance?

Accepted Answer

$$q = m 	imes c 	imes \Delta T$$

Question 17

A sample of water is heated from $$20^\circ	ext{C} to$$ $$70^\circ	ext{C}. $$Which of the following best describes this process?

Accepted Answer

A physical change

Question 18

Which of the following is true about compounds?

Accepted Answer

They are composed of two or more elements bonded together in a fixed proportion.

Question 19

Which of the following is an example of energy transfer as work ($$w$$)?

Accepted Answer

Compressing a gas with a piston

Matter and Energy: Classification, Properties, and Changes

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