Chemistry Unit 2

Pregunta	Respuesta
Base	Substances that can react with acids and neutralise them to make a salt and water. Usually metal oxides or hydroxides.
Acids	Substance with a pH less than 7.
Alkalis	Substances with a pH more than 7. Bases that dissolve in water.
Neutral Solutions	Solution with a pH of 7.
Anhydrous	Without water.
Hydrated	With water.
Exothermic	Heat is given out
Endothermic	Heat is taken in
Catalyst	A substance that speeds up a reaction without getting used up in the reaction or affecting the result.
Activation energy	Minimum amount of energy needed by particles to react.
Mole	The unit for amount of subtance. The molar mass is the relative formula mass of a substance in grams (g/mol).
Atom	The smallest particle of an element that can exist.
Molecule	Two or more atoms bonded together. Smallest unit of a chemical compound.
Compound	A thing that is composed of two or more separate elements.
Isotope	Two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.
Nanoparticles	Really tiny particles that are 1-100 nanometres across.
Nanoscience	Using nanoparticles.

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