Chemistry definitions Flashcards
Pure substance
Substance composed of any one kind of matter and having an unique set of properties; such as colour, hardness, melting point, and conductivity
Matter
anything that has mass and takes up space
Mixture
Combination of pure substances
Element
A substance that cannot be broken down into any simpler substances
Compound
Pure substance made from two or more elements that are combined together chemically
Mechanical mixture
Mixture that may contain several solids combine together
Product
New substance formed during a chemical reaction
Reactant
Starting substance in a chemical reaction
Ion
Atom/s with a negative charge or positive charge
Halogen
Member of the family of elements composed of very reactive, coloured non metals; group 17 on the periodic table
Nobel gases
Member of the family of nonmetal gases that are colourless, odourless, and unreactive; Number 18 on the periodic table
Chemical change
Transformation of one or more substances into new substances with new properties
Compound
Pure substance made from two or more elements that are combined together chemically
Element
Substance that cannot be broken down into any simpler substance by chemical means
Nucleus
Central core in an atom, composed of protons and neutrons
