Chemical Reactions

Question 1

What happens during a chemical reaction?

Answer 1

Old bonds break and new bonds are produced

Atoms exchange electrons with each other during chemical reactions, which can involve new configurations of atoms.

Question 2

What are the 4 major types of reactions?

Answer 2

1. Acid-base
2. Combustion
3. Corrosion
4. Reactions of life

Question 3

What reaction is photsynthesis?

Answer 3

Reaction of life

Question 4

What reaction is respiration?

Answer 4

Reaction of life

Question 5

Define corrosion

Answer 5

The oxidation of metals.

Rusting is the corrosion of iron and steel.

Occurs faster in marine environments.

Question 6

In an acid-base chemical reaction, what happens?

Answer 6

Both the acid and base mixed will neutralise.

Neutralisation reactions produce H2O and asalt.

Question 7

How do you write chemical reactions?

Answer 7

Reactants -> Products

E.g.
Photosynthesis
Carbon Dioxide + water -> (light) oxygen + glucose

Chemical formula:
CO2 + H2O ->(light) C6H1206

Question 8

What is combustion?

Answer 8

An oxidation exothermic reaction

Question 9

Combustion requires what 3 things

Answer 9

1. Oxygen
2. Fuel
   3.heat

Question 10

Common fuels:

Answer 10

Fossils fuels
Wood
Sugar/carbohydrates
Fats/oils/lipids

Question 11

Define photosynthesis

Answer 11

the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water.

Plants use sunlight to convert carbon dioxide and water into oxygen and glucose.

Question 12

Define respiration

Answer 12

process in living organisms involving the production of energy

Glucose reacted with oxygen in cells to produce energy, which keeps cells alive

Question 13

Define corrosion

Answer 13

The oxidation of metals. Rusting is the corrosion of iron and steel.

Occurs faster in marine environments.

Question 14

Define acid-bases reaction

Answer 14

Neutralisation reactions produce water and a salt

Question 15

How to write chemical reactions

Answer 15

Reactants -> Products (reaction conditions above arrow)

Question 16

Define exothermic reaction

Answer 16

A chemical reaction in which it releases/produces energy by light or heat

Question 17

Define endothermic reaction

Answer 17

chemical reactions in which the reactants absorb heat energy from the surroundings to form products

Question 18

Define law of conservation of energy

Answer 18

matter and energy can neither be destroyed nor created, only transformed or transferred.

Question 19

Balance this chemical equation:
P4O10 + H2O → H3PO4

Answer 19

P4O10 + 6 H2O → 4 H3PO4

Question 20

Balance:
CO2 + H2O → C6H12O6 + O2

Answer 20

6CO2 + 6H2O → C6H12O6 + 6O2

Question 21

Balance:
SiCl4 + H2O → H4SiO4 + HCl

Answer 21

SiCl4 + 4H2O → H4SiO4 + 4HCl

Question 22

Is photosynthesis exothermic or endothermic? And why?

Answer 22

Endothermic since sunlight energy is absorbed during the process of photosynthesis.

Question 23

What is the balanced equation of photosynthesis?

Answer 23

6CO2 + 6H2O -> (sunlight) C6H12O6 + 6O2

Question 24

How to write worded formula of photosynthesis?

Answer 24

Carbon dioxide + water -> (sunlight) glucose + oxygen

Question 25

What things photosynthesise?

Answer 25

Plants Algae Cyanobacteria

Question 26

What kind of respiration did we focus on?

Answer 26

Aerobic respiration Process in which organisms use fuel such as fats and sugars into chemical energy

Question 27

What is the balanced chemical formula of respiration?

Answer 27

C6H12O6 + 6O2 -> 6CO2 + 6H2O

Question 28

How to write worded formula of respiration?

Answer 28

glucose + oxygen -> carbon dioxide + water

Question 29

What things respires?

Answer 29

Animals Humans Plants Fungi

Question 30

What is the chemical compound when carbon dioxide dissolves in water?

Answer 30

Carbonic acid