Q: Which equation is used to calculate the amount of heat required to change the temperature of a substance?

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

Question 1

Which of the following best describes a homogeneous mixture, and which is a real-life example?

Accepted Answer

A mixture with a uniform composition throughout; brass (copper and zinc)

Question 2

Which of the following is a chemical change?

Accepted Answer

Burning a piece of wood to produce ash and gases

Question 3

A sample of copper is heated from $$25\ ^\circ\mathrm{C} to$$ $$100\ ^\circ\mathrm{C}. $$Which property of copper changes during this process?

Accepted Answer

Its physical property (temperature)

Question 4

Which equation correctly converts a temperature from Celsius to Fahrenheit?

Accepted Answer

$$T_F = 1.8 	imes T_C + 32$$

Question 5

A 50.0 g sample of water at $$0\ ^\circ\mathrm{C} is $$melted. How much energy (in kilojoules) is required? (Heat of fusion for water = $$334\ \mathrm{J/g})$$

Accepted Answer

$$16.7\ \mathrm{kJ}$$

Question 6

Which of the following is an example of potential energy?

Accepted Answer

A stretched rubber band

Question 7

What is the specific heat ($$c) of a $$metal if $$24.8\ \mathrm{g}$$ absorbs $$275\ \mathrm{J}$$ and its temperature rises from $$20.2\ ^\circ\mathrm{C} to$$ $$24.5\ ^\circ\mathrm{C}$$?

Accepted Answer

$$c = 2.85\ \mathrm{J/g}^\circ\mathrm{C}$$

Question 8

Which of the following statements about the Kelvin temperature scale is correct?

Accepted Answer

Absolute zero is $$0\ \mathrm{K}$$, and there are no negative temperatures.

Question 9

How many kilocalories are in a cup of whole milk containing $$12\ \mathrm{g}$$ carbohydrate, $$9\ \mathrm{g}$$ fat, and $$9\ \mathrm{g}$$ protein? (Carbohydrate: $$4\ \mathrm{kcal/g}$$, Fat: $$9\ \mathrm{kcal/g}$$, Protein: $$4\ \mathrm{kcal/g})$$

Accepted Answer

$$93\ \mathrm{kcal}$$

Question 10

Which process is exothermic?

Accepted Answer

Condensation of steam

Question 11

A sample of steam at $$100\ ^\circ\mathrm{C}$$ and mass $$50.0\ \mathrm{g}$$ condenses to liquid water at $$100\ ^\circ\mathrm{C}. $$How much energy (in kJ) is released? (Heat of vaporization for water = $$2260\ \mathrm{J/g})$$

Accepted Answer

$$113\ \mathrm{kJ}$$

Question 12

Which of the following is a physical property?

Accepted Answer

Water boils at $$100\ ^\circ\mathrm{C}.$$

Question 13

Which of the following best describes a compound?

Accepted Answer

A substance made of two or more elements chemically combined in a fixed ratio

Question 14

What is the temperature in Celsius if the thermometer reads $$15\ ^\circ\mathrm{F}$$?

Accepted Answer

$$-26.1\ ^\circ\mathrm{C}$$

Question 15

Which of the following is a heterogeneous mixture?

Accepted Answer

Salad with tomatoes and lettuce

Question 16

Which equation is used to calculate the amount of heat required to change the temperature of a substance?

Accepted Answer

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

Question 17

A calorimeter is used to measure:

Accepted Answer

The energy value of a food sample

Question 18

Which of the following is NOT a physical change?

Accepted Answer

Burning a candle

Question 19

Which of the following statements about energy and nutrition is correct?

Accepted Answer

Carbohydrates are used first for energy, followed by fats, then proteins.

Matter and Energy: Classification, Properties, and Changes

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