Calculating and Explaining Energy Change

Question 0

Endothermic reactions give out/take in heat

Answer 0

Take in heat

Question 1

Exothermic reactions give out/take in heat

Answer 1

Give out heat

Question 2

Takes 4.2J of energy to heat up 1g of water by 1°C. What is this also known as?

Answer 2

1 calorie

Question 3

What is the unit for energy?

Answer 3

Joules

Question 4

What is the unit for mass?

Answer 4

Grams

Question 5

How many joules is 1 kilojoule?

Answer 5

1000J is 1kJ

Question 6

What is the method called that is used to measure the amount of heat energy burning in a substance?

Answer 6

Calorimetry

Question 7

How do you measure the temperature change that takes place when fuel burns?

Answer 7

Place 100g of water in calorimeter and measure temperature
Find mass (in grams) of the fuel to be burned
Burn the fuel under the water in the calorimeter and record temperature change of water
Weigh fuel again (so you can calculate how much fuel has been used)

Question 8

How can the amount of energy released in a neutralisation reaction be calculated?

Answer 8

Mixing chemicals together in insulated container so less heat is lost to surroundings
Measure temperature before and after

Question 9

Does breaking bonds require energy or give off energy?

Answer 9

Requires energy

Question 10

Does making bonds require energy or give off energy?

Answer 10

Give off energy

Question 11

Is more energy is required to break old bonds than is released when new bonds are formed, the reaction is…

Answer 11

Endothermic

Question 12

In energy level diagrams for an exothermic process, does the line go up or down overall?

Answer 12

Down

Question 13

What is activation energy?

Answer 13

The minimum amount if energy needed for a reaction to occur

Question 14

What does a catalyst do?

Answer 14

Speeds up rate of chemical reaction and lowers activation energy