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Flashcards in Combustion & Corrosion Deck (32):
1

Endothermic reactions

- a chemical reaction that absorbs energy: eg when a cold pack is applied on an injury, absorbing the energy
- in an endothermic reaction the products have more energy than the reactants.

2

Exothermic reaction

- a chemical reaction the releases energy: eg a gas stove which has a blue flame releasing the energy in heat or, a series of bush fires as it releases huge amounts of heat and light.
- in an exothermic reaction the reactants have more energy than the products.

3

Reactants.

Substances/chemicals that take part in a chemical reaction

4

Products

Are substances/chemicals that are formed by the chemical reaction

5

Photosynthesis

- a reaction the green plants use to form glucose (sugar)
- this reaction absorbs energy from sunlight, endothermic reaction

6

Combustion reactions

- are examples of exothermic reactions
- oxygen gas is required for combustion to occur. Meaning combustion occurs when something reacts with oxygen

7

Incomplete combustion

- occurs when oxygen is restricted and other reactions occur
- these are known as dirty as they produce carbon which is left behind as soot, charcoal or smoke. They also produce the poisonous gas carbon monoxide (fire produces these substances)

8

Complete combustion

- complete combustion is when oxygen is not restricted and produces carbon dioxide and carbon dioxide which are know as clean reactions

9

Corrosion

The breakdown of metals due to their reaction with other chemicals to form other compounds. An example would be rust

10

Rust

When iron or steel slowly reacts with water and oxygen and corrodes into rust aka hydrated iron oxide

11

Verdigris

A green coating of cooper hydroxide that is produced when copper reacts with moisture, carbon dioxide and oxygen in the atmosphere

12

Tarnish

A black coating of silver sulfate that is produced when silver reacts Sulfur in the atmosphere

13

How is verdigris formed

When copper corrodes by reacting with gases in the air

14

How is tarnished formed

When pure silver reacts with Sulfur creates black coating

15

What is flaky and easy to dislodge

Rust

16

What is aluminium oxide

Is a fine layer of dull grey which appears on the surface of metals when aluminium reacts with the air

17

Anodising

A way of protecting aluminium from corrosion, by deliberately creating a layer of aluminium oxide over it

18

Hydrocarbons

Highly combustible chemicals for example petrol

19

Law of conservation of mass

When atoms are not created or destroyed in a chemical reaction as they can only be rearranged

20

Safety flame

Incomplete combustion as it received no oxygen gas

21

Blue flame

Complete combustion as it receives oxygen gas

22

Examples on endothermic reactions

- photosynthesis
- sherbet tingles in your mouth
- a chemical cold pack as it cools sore muscles

23

Examples of exothermic reactions

- a series of bushfires
- aerobic respiration releases energy for use in cells
- magnesium burns in oxygen releasing light

24

Similarities of exothermic and endothermic reactions?

- they both the form of heat as their energy
- they are both a type of chemical reaction
- they both need two substances to combine to make the certain reaction

25

Differences of exothermic and endothermic reactions

- exothermic reaction lets of energy whereas endothermic absorbs energy

26

Combustion of fossil fuels examples
What the produce and products

- buses burners
- gas stoves
- water heaters
Produce a hot blue flame by burning methane or ethane gas in oxygen which produce hydrocarbons

27

Indications of incomplete combustion

Carbon in the atmosphere as soot charcoal and smoke
Carbon monoxide poisonous gas

28

Explain respiration

It gives you energy. The reaction needs glucose from food and oxygen from your body. You breathe out its product carbon dioxide

Exothermic reaction

29

Combustion reaction that do not produce carbon dioxide and water

When magnesium and oxygen react they form magnesium oxide

30

Examples of oxidation

Corrosion

31

Similarities of corrosion and rust ion

- both involve the elements of metal in the reactions

32

Difference of corrosion and rusting

- rusting is a type of corrosion
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