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Questions and Answers
What type of fuels will eventually run out?
What is the term for a possible source of danger?
What is a chemical reaction that involves a substance reacting quickly with oxygen and gives out light and heat?
What is the term for a change in which new substances are not made?
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What is a way of representing a chemical reaction simply?
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What is the term for a substance that is made in a chemical reaction?
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What is the term for a change in which a compound breaks down to form simpler compounds and/or elements?
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What is the principle that states that the total mass of reactants is equal to the total mass of products?
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What is the term for a variable that can only have whole-number values?
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What is the term for a chemical reaction in which energy is transferred to the surroundings?
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Study Notes
Fossil Fuels and Energy
- Fossil fuels are formed from the remains of animals and plants that died millions of years ago.
- Examples of fossil fuels include coal, oil, and natural gas.
- Fossil fuels are non-renewable, meaning they take millions of years to form and will eventually run out.
Chemical Reactions
- Oxidation is a chemical reaction where substances react with oxygen to form oxides.
- Combustion is a chemical reaction where a substance reacts quickly with oxygen, releasing light and heat.
- Decomposition is a chemical reaction where a compound breaks down into simpler compounds and/or elements.
Chemical Equations
- A word equation is a way to represent a chemical reaction, with reactants on the left and products on the right, separated by an arrow.
- A balanced symbol equation uses chemical formulae to represent reactants and products, showing how atoms are rearranged and the relative amounts of reactants and products.
Chemical Principles
- Conservation of mass states that the total mass of reactants equals the total mass of products in a chemical reaction.
- Endothermic changes transfer energy from the surroundings, while exothermic changes transfer energy to the surroundings.
General Terms
- A hazard is a possible source of danger.
- A reactant is a starting substance in a chemical reaction.
- A product is a substance made in a chemical reaction.
- A physical change is a reversible change, where new substances are not formed.
- A discrete variable is one that can only have whole-number values.
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Description
Learn about fossil fuels, non-renewable energy sources, and the chemical reactions involved in their formation and use.
