Energy Review H 2025_Quizizz

An ice cube is placed in water in a closed system.

If the energy absorbed by an ice cube was 60 calories, then the energy lost by the water was ____________.

• 60 calories

• 120 calories

• 0 calories

• -60 calories

A high specific heat means...

• It heats up quickly with energy added
• It requires more energy to change temperature

What would be the effect on the particles if more heat is supplied to the system?

• They would slow down
• They would stop moving
• They would speed up
• There would be no effect

What is the Activation energy of this reaction?

• 40 kJ

• 20 kJ

• 80 kJ

• 60 kJ

Answer explanation

Activation energy is from reactants to activated complex (top of the curve)

What is the ΔH of this reaction?

• 40 kJ
• 20 kJ
• 80 kJ
• 60 kJ

A 250 gram sample of water is heated by the burning of a biscuit. The waters temperature increases by 45⁰C. How much energy in calories did the biscuit release to the water?

• 47.025 kJ

• 4.7025 kJ

• 47,025 kJ

• 470.25 kJ

How much heat is required to melt/ freeze 30g ethanol?

• 25.11 kJ

• 7.67 kJ

• 10.5 kJ

• 3.19 kJ

Answer explanation

This is referring to section B-C on the graph where temp is constant, there have to use heat of fusion formula to solve!

When ΔH is negative there is a loss of energy from the system and its surroundings.

• True

• False

Is this reaction endothermic or exothermic?

• endothermic 
• exothermic

A measure of the average kinetic energy of the particles in an object is

• heat
• endothermic.
• exothermic.
• temperature.