Changes in Materials Due to Oxygen

Changes in Matter Due to Oxygen

Open Ended

What do you think happened to the apple and the mushroom?

Diatomic Oxygen = Two atoms of oxygen

​Diatomic Oxygen is 20.95% of the earth's atmosphere.

Living things make use of oxygen.

For humans, oxygen is important to health, recreation, medicine, space exploration, manufacturing, etc.

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Oxygen

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Combustion means burning.

Ex. When magnesium metal reacts with the oxygen in the air, they create magnesium oxide (MgO).

Combustion produces fire.​

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Combustion

Multiple Choice

Which material does NOT combust easily?

• wood

• gasoline vapor

• matches

Open Ended

Why do you think the fire went out?

Iron or iron alloys can lose electrons when exposed to oxygen.

This reaction is called oxidation and it produces rust.​

Rusting makes metal weak and brittle.

​Corrosion is the deterioration of metals because of chemical reactions.

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​Oxidation

Multiple Choice

What is NOT an effect of rusting?

• Metals become weak.

• Metals change their color to orange.

• Metals become harder.

​A picture of a shipwreck rusting underwater.

Fossil fuels are hydrocarbons formed from the remains of dead organisms.

When we burn fossil fuels, they produce carbon dioxide - a greenhouse gas.​

Greenhouse gases cause climate change.

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Emission of Carbon Dioxide

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Multiple Choice

Which fuel is NOT a fossil fuel?

• gasoline

• coal

• solar power

• LPG

Open Ended

Why do you think it is important to lessen the use of fossil fuels?