Activate 1 - Chapter C3 - Chemical Reaction Flashcards
Chemical Reaction
A change in which atoms are rearranged to create new substances.
Physical Change
A change that is reversible, in which new substances are not made. Examples of physical changes include changes of state and dissolving.
Reactant
A starting substance in a chemical reaction
Product
A substance that is is made in a chemical reaction.
Word Equation
A way of representing a chemical reaction simply. The reactant are on the left of an arrow and the products are on the right. The arrow means reacts to make.
Hazard
A possible source of danger.
Risk
The chance of damage or injury from a hazard.
Fuel
A material that burns to transfer useful energy.
Combustion
A chemical reaction in which a substance reacts quickly with oxygen and gives out light and heat. Also called burning.
Fossil Fuel
A fuel made from the remains of animals and plants that died millions of years ago. Fossil fuels include coal, oil and natural gas.
Non-Renewable
Some fuels are non-renewable. They form over millions of years and will one day run out.
Oxidation
A chemical reaction in which substances react with oxygen to form oxides.
Decomposition
A chemical in which a compound breaks down to form simpler compounds and/or elements.
Discrete
A variable that can only have whole-number values.
Conservation of Mass
In a chemical reaction, the total mass of reactants is equal to the total mass of products. This is conservation of mass. Mads is conserved in chemical reactions and in physical changes.
