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.
Balanced Symbol Equation
In a balanced symbol equation, chemical formulae represent
Endothermic Change
An endothermic change transfers energy from the surroundings.
Exothermic Change
An exothermic change transfers energy to the surroundings.
