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Questions and Answers
What type of fuels will eventually run out?
What type of fuels will eventually run out?
What is the term for a possible source of danger?
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 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?
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?
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?
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?
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?
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?
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?
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.
