Science

Combustion is a scientific word for:

• exploding
• burning
• evaporating
• getting hotter

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A fuel is:

• a substance formed from living organisms that lived a long time ago
• a substance that explodes
• a substance that contains hydrocarbons
• a substance that transfers energy usefully, usually by heating.

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When hydrogen reacts with oxygen, the product is:

• water
• oxide
• carbon dioxide
• hydrogen

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The products of combustion of a hydrocarbon are:

• hydrogen + oxygen
• carbon dioxide + water
• carbon dioxide + hydrogen
• carbon + water

Oxidation is always:

• a reaction in which a substance combines with oxygen.

• a reaction in which a substance burns in oxygen.

• a reaction in which a substance burns in air.

• an explosive reaction.

When zinc burns in oxygen it forms:

• water

• zinc hydroxide

• zinc oxide

• zinc carbonate

During a chemical reaction, reactants form products. Compare the mass of reactants with the mass of products formed.

• The mass of reactants is greater than the mass of products.

• The mass of products is greater than the mass of reactants.

• The mass of products is the same as the mass of reactants.

• The change in mass depends on what the reactants and products are.

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When 4.8 g of magnesium reacts with 3.2 g of oxygen, how much magnesium oxide is formed?

• 1.6g

• 4.9g

• 7.0g

• 8.0g

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NGSS.HS-PS1-7

The three sides of a fire triangle are:

• fire, water, heat

• heat, water, fire

• heat, oxygen, fuel

• fire, oxygen, fuel

What does this hazard symbol warn of?

• the substance is explosive

• the substance burns easily

• the substance supplies oxygen to fires

• the substance puts out fires