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Main Exam Defs.

Chemistry Definition

Acid pH Level: Under 7. Neutalises alkalis.
Alloy A metal made by mixing 2+ metals/non-metals.
Atomic Number The number of protons in an element's nucleus.
Base pH Level: Over 7. Turn litmus blue and react with acids to form salt.
Chemical Reaction A change in the molecular or ionic structure of a substance.
Compound 2+ elements chemically combined.
Covalent Bond Chemical bonding where atoms share electron pairs.
Distillation Heating a liquid to create a vapour, which is collected when cooled separate from original liquid. Separates soluble solid and its solvent.
Electrolysis Decomposition produced by passing an electric current through a liquid or solution containing ions.
Element Substance made of one type of atom.
Hard Water Contains minerals (e.g: calcium/magnesium ions) that don't allow lather.
Indicator Chemicals that change colour according to pH level.
Ionic Bond A chemical bond in which one atom loses an electron to form a positive ion and the other atom gains an electron to form a negative ion.
Isotope An atom of an element with a different amount of neutrons.
MIxture 2+ substances mixed together but not chemically combined.
Molecule Groups of 2 or more atoms joined together.
Neutralization When an acid and base react to form a salt.
pH Scale Measures the acidity and basicity of a substance.
Solution The solute and solvent together.
Created by: Grainne



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