Energy Transfer

Question 1

What is an exothermique reaction?

Answer 1

A reaction that gives out energy to the surrounding

Usually in the form of heat

Question 2

How can an exothermique reaction be shown?

Answer 2

By a rise of temperature

Question 3

Give me 2 examples of an exothermic reaction

Answer 3

Combustion

Burning fossil fuel

Question 4

What is an endothermic reaction?

Answer 4

A reaction where energy is taken in

Usually in the form of heat

Question 5

How can an endothermic reaction be shown?

Answer 5

By a decrease in Temperature

Question 6

Give me an example of an endothermic reaction?

Answer 6

Thermal decomposition

Question 7

How can you tell if there is an endothermic or exothermic reaction going on in an experiment ?

Answer 7

By the temperature change

Experiment-

Mixing the reactants in a POLYSTYRENE CUP

Putting cotton around the cup
Place a thermometer inside the cup
Add a lid to the cup

Measure the temperature at the start

Then measure the temperature of the reaction at the end

If temperature decreases - endo
If temperature increases - exo

Question 8

What happens when an acid mixes with an alkali?

Answer 8

It is an exothermic reaction

Temperature will increase

Question 9

What happens when you dissolve ammonium nitrate in water?

Answer 9

It is an endothermic reaction

Temperature will decrease

Question 10

What happens to the particles in an exothermic reaction?

Answer 10

Particles will bond

(Attach to each other)

This will release a lot of energy

Question 11

What happens to the particles in an endothermic reaction?

Answer 11

Particles that are in a bond will break

(Becomes 2 individual particles)

This demands energy when breaking
(Energy being supplied to break the bond)