Chemistry 5.1.1

Question 1

Why do Chemical Reactions occur?

Answer 1

So Atoms can become stable.

Question 2

How do Atoms get a full Outer Shell to be Stable?

Answer 2

Chemical Bonding.

Question 3

Define ‘System’:

Answer 3

What happens in the Chemical Reaction.

Question 4

In the majority of Reactions, Energy is Present in the form of…

Answer 4

Heat Energy.

Question 5

Type of Reaction where less Energy is Taken In, and more Energy is Released Out.

Answer 5

Exothermic.

Question 6

Type of Reaction where more Energy is Taken in, and less Energy is Released out.

Answer 6

Endothermic.

Question 7

Type of Reaction where the Temperature of the Surroundings Increases:

Answer 7

Exothermic.

Question 8

Type of Reaction where the Temperature of the Surroundings Decreases:

Answer 8

Endothermic.

Question 9

3 Examples of Exothermic Reactions:

Answer 9

-Combustion

-Oxidation

-Neutralisation

Question 10

Hand warmers are based on the Release of Heat from an ___ Reaction.

Answer 10

Exothermic.

Question 11

3 Examples of Endothermic Reactions:

Answer 11

-Electrolysis

-Photosynthesis

-Thermal Decomposition

Question 12

Cold Ice packs are based on ___ Reaction’s ability to take in Heat from the surroundings.

Answer 12

Endothermic.

Question 13

What can be used to measure the change in Heat in a Reaction?

Answer 13

Thermometer.

Question 14

Law of Conservation of Energy:

Answer 14

Energy cannot be created nor destroyed, only Transferred.

Question 15

Why do the Products in an Exo. React. have less Energy than the Reactants?

Answer 15

Because in Exo. React., Energy is Transferred to the surroundings.

Question 16

In what type of Reaction does Temp. of surroundings Increase, and Heat Content of System Decreases?

Answer 16

Exothermic.

Question 17

In what type of Reaction does Temp. of surroundings Decrease, and Heat Content of System Increases?

Answer 17

Endothermic.