Energy

Question 1

What is an exothermic reaction

Answer 1

Is one which gives out energy often in the form of heat and is usually shown by a rise in temperature.

Question 2

What is an endothermic reaction?

Answer 2

Is one which takes in energy usually in the form of heat and is shown by a fall in temperature.

Question 3

To break existing bonds…

Answer 3

Energy must be supplied.

Question 4

When bonds form energy…

Answer 4

Is released.

Question 5

In an exothermic energy level diagram the product line is always…

Answer 5

Lower than the reactants.

Question 6

In an endothermic energy level diagram the products are always…

Answer 6

Higher than the reactants.

Question 7

1 calorie =

Answer 7

The amount of energy needed to raise the temp. of 1g of water by 1C. 1 calorie is 4.2 joules.

Question 8

1 Calorie =

Answer 8

The amount of energy needed to raise the temp. of 1 kilogram of water by 1 degree celcius. 1 Calorie = 4200 joules.