Year 9 Science: Chemical Reactions
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13 Terms
Chemical Reaction
A change in which bonds between atoms are broken and new substances are formed.
Reactants
The original substances present before a chemical reaction takes place.
Products
The new substances that are formed during a chemical reaction.
Law of Conservation of Mass
States that matter can be neither created nor destroyed during a chemical reaction.
Law of Constant Proportions
States that a compound always contains the same relative amounts of each element.
Exothermic Reaction
A chemical reaction that releases heat energy to the surroundings.
Endothermic Reaction
A chemical reaction that absorbs energy from its surroundings.
Neutralization
A reaction where an acid and a base react to form a salt and water.
Acid Rain
Rain made more acidic when atmospheric sulfur dioxide and nitrogen oxides react with water.
Combustion
A reaction in which a substance reacts with oxygen and heat is released.
Hydrocarbons
Compounds of hydrogen and carbon, such as fossil fuels like natural gas, petrol, and coal.
Oxidation
A chemical reaction involving the transfer or loss of electrons from a reactant.
Chemical Process
A reaction that changes the arrangement of atoms or molecules of the substances involved.