Chemistry Quiz 1 (Year 9) U4 9Fa

Chemistry Quiz 1 (Year 9) U4 9Fa

Fill in the Blank

In an exothermic reaction, heat is ...........................

Multiple Select

For Exothermic:

• Combustion (burning)

• Neutralisation

• Evaporation

• Melting

• Freezing

Fill in the Blank

a)

Identify the substances that release (give out) heat when they dissolve in water.

Fill in the Blank

b)

Identify the substance that takes in the most heat when it dissolves in water.

Open Ended

He adds ammonium nitrate to the water, and stirs until it dissolves.

a)

The water between the flask and the wooden block freezes. Explain why.

Open Ended

b)

Does ammonium nitrate dissolve exothermically or endothermically? Explain how you know.

Open Ended

Open Ended

b)

Explain how the data show that the neutralisation reaction is exothermic.

Open Ended

Josie investigates four fuels. She sets up the apparatus below. She uses the fuels to heat water.

She measures the temperature change of the water when she burns different fuels in the spirit burner.

a)

Identify the variable Josie changes

Open Ended

Josie investigates four fuels. She sets up the apparatus below. She uses the fuels to heat water.

She measures the temperature change of the water when she burns different fuels in the spirit burner.

b)

Identify the variable Josie measures

Open Ended

c)

Josie heats the same volume of water with each fuel. Name two other variables that Josie should control.

Open Ended

d)

Josie does some preliminary work to help her decide what volume of water to heat with the fuels. Suggest why.

Open Ended

e)

Josie’s results are in the table.

What are the missing values for propanol and butanol in the table?

Open Ended

f)

Which fuel released least energy on burning?

Open Ended

g)

Josie decided to repeat her investigation. Suggest why.

Open Ended

h)

Josie thinks that some of the heat released by the burning fuels was not transferred to the water. Where else might the heat have been transferred to?