Q: Which equation correctly relates heat, mass, specific heat capacity, and temperature change?

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

Q: A student heats 10.0 g of water from 25.0°C to 35.0°C. The specific heat capacity of water is $$4.184 \text{ J/g} \cdot \text{°C}. $$How much heat is absorbed?

$$q = 10.0 \times 4.184 \times (35.0 - 25.0) = 418.4 \text{ J}$$

Q: Convert 100.0 Cal (nutritional Calories) to joules.

$$100.0 \text{ Cal} \times 1000 \text{ cal/Cal} \times 4.184 \text{ J/cal} = 418,400 \text{ J}$$

Q: A sample of gallium (specific heat capacity $$0.372 \text{ J/g} \cdot \text{°C}) $$with mass $$2.5 \text{ g} is $$heated from $$25.0^\circ \text{C} to$$ $$29.0^\circ \text{C}. $$How much heat is required?

$$q = 2.5 \times 0.372 \times (29.0 - 25.0) = 3.72 \text{ J}$$

Question 1

Which of the following statements best describes a compound?

Accepted Answer

A compound is a pure substance composed of two or more elements in fixed, definite proportions.

Question 2

Which property is classified as a chemical property?

Accepted Answer

Flammability of gasoline

Question 3

A sample of matter is observed to have a definite shape and volume. Its atoms are arranged in a well-ordered, repeating pattern. What type of matter is this?

Accepted Answer

Crystalline solid

Question 4

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

Accepted Answer

Oil and water

Question 5

Which equation correctly relates heat, mass, specific heat capacity, and temperature change?

Accepted Answer

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

Question 6

A student heats 10.0 g of water from 25.0°C to 35.0°C. The specific heat capacity of water is $$4.184 	ext{ J/g} \cdot 	ext{°C}. $$How much heat is absorbed?

Accepted Answer

$$q = 10.0 	imes 4.184 	imes (35.0 - 25.0) = 418.4 	ext{ J}$$

Question 7

Which of the following changes is a chemical change?

Accepted Answer

Iron rusting in air

Question 8

Which statement about the law of conservation of mass is correct?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 9

Convert 100.0 Cal (nutritional Calories) to joules.

Accepted Answer

$$100.0 	ext{ Cal} 	imes 1000 	ext{ cal/Cal} 	imes 4.184 	ext{ J/cal} = 418,400 	ext{ J}$$

Question 10

Which of the following is true about gases?

Accepted Answer

Gases are compressible because their atoms or molecules are not in contact with one another.

Question 11

Which temperature scale assigns absolute zero to 0 units?

Accepted Answer

Kelvin

Question 12

A chemical reaction absorbs energy from its surroundings. What type of reaction is this?

Accepted Answer

Endothermic

Question 13

Which of the following is a homogeneous mixture?

Accepted Answer

Sweetened tea with all sugar dissolved

Question 14

Which formula is used to convert Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 15

Which of the following best describes potential energy in a chemical system?

Accepted Answer

Energy associated with the positions of the particles that compose the chemical system.

Question 16

A sample of gallium (specific heat capacity $$0.372 	ext{ J/g} \cdot 	ext{°C}) $$with mass $$2.5 	ext{ g} is $$heated from $$25.0^\circ 	ext{C} to$$ $$29.0^\circ 	ext{C}. $$How much heat is required?

Accepted Answer

$$q = 2.5 	imes 0.372 	imes (29.0 - 25.0) = 3.72 	ext{ J}$$

Question 17

Which of the following is NOT a physical property?

Accepted Answer

Flammability

Question 18

Which process is used to separate mixtures through physical changes?

Accepted Answer

Distillation

Chapter 3: Matter and Energy – Structured Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard