Properties of matter, Density, Specific heat, Classification, State of Matter

Question 1

If water starts to freeze at 0 degrees Celsius, what would be its temperature when completely frozen?

Answer 1

0 degrees Celsius

Question 2

In which state of matter are particles spread out uniformly and randomly?

Answer 2

Gas

Question 3

What is the formula for calculating density?

Answer 3

Density = Mass/Volume

Question 4

If the mass of a substance increases while the volume remains the same, what will happen to the density?

Answer 4

The density will increase

Question 5

Which of the following materials likely has the lowest density?

Answer 5

Air

Question 6

In a chemical reaction, what state of matter does not hold a definite shape but has a definite volume?

Answer 6

Liquid

Question 7

Why does a cork float on water?

Answer 7

Its density is less than that of water

Question 8

The specific heat capacity of water is 4.184 J/g°C. How much heat is absorbed when 500g of water is heated from 20°C to 90°C?

Answer 8

147300 J

Question 9

Differentiating water and mercury using their specific heat is because…

Answer 9

Each substance has a unique specific heat

Question 10

If a substance has a high specific heat, it means…

Answer 10

It needs more heat to increase its temperature

Question 11

Why are substances with high specific heats often used for heat storage?

Answer 11

They can absorb lots of heat without getting too hot

Question 12

What does the specific heat of a substance indicates about that substance?

Answer 12

Its resistance to temperature changes

Question 13

What does specific heat refer to in a substance?

Answer 13

The energy needed to change the temperature of 1g by 1°C

Question 14

In calculating specific heat, which one is the ‘amount of heat’ variable in the formula q=mcT?

Answer 14

q

Question 15

If two substances have the same mass, receive the same amount of heat, but have different specific heat capacities, what will be different?

Answer 15

Their resulting temperatures will be different

Question 16

What is the process of a liquid turning into a gas called?

Answer 16

Evaporation

Question 17

The specific heat of lead is 0.129 J/g°C. If 400 g of lead absorbs 10,320 J of heat, what is the temperature change?

Answer 17

200°C

Question 18

What happens to molecules of a gas during condensation?

Answer 18

They slow down and come closer together

Question 19

An object has a volume of 20 cm3 and a mass of 100 g. What is its density?

Answer 19

5 g/cm3

Question 20

In an exothermic reaction, if 300 grams of substance X with a specific heat of 0.897 J/g°C releases 1500 J of heat energy, what is the temperature change?

Answer 20

5.57°C

Question 21

If two substances, A and B, have the same mass, which would require more energy to raise its temperature if A has a higher specific heat than B?

Answer 21

Substance A

Question 22

How do we calculate specific heat in Chemistry?

Answer 22

q = mcΔT

Question 23

How does temperature generally affect the density of a liquid or gas?

Answer 23

Density decreases as temperature increases

Question 24

Gold has a density of approximately 19.3 g/cm³. How does this compare to the density of water (1g/cm³)?

Answer 24

Gold is denser than water

Question 25

Water has a high specific heat. What does this mean?

Answer 25

Water heats up and cools down slowly