the mixture made by adding a soluble substance to water
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atom
the smallest part of an element that can still be recognised as that element
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atomic number
the number of protons in an atom. it is sometimes called the proton number
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balanced symbol equation
a symbol equation in which there are equal numbers of each type of atom on either side of the equation
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biofuel
fuel made from animal or plant products
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chromatography
the process whereby small amounts of dissolved substances are separated by running a solvent along a material such as absorbent paper
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compound
a substance made when two or more elements are chemically bonded together
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electron
a tiny particle with a negative charge. Electrons orbit the nucleus of atoms or ions in shells
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electronic structure
a set of numbers to show the arrangement of electrons in their shells
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element
a substance made up of only one type of atom.An element cannot be broken down chemically into any simpler substance
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group
all the elements in the columns in the periodic table
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ion
a charged particle produced by the loss or gain of electrons
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isotope
atoms that have the same number of protons but different number of neutrons
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law of conservation of mass
the total mass of the products formed in a reaction is equal to the total mass of the reactants
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mass number
the number of protons plus neutrons in the nucleus of an atom
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neutron
a dense particle found in the nucleus of an atom. It is electrically neutral, carrying no charge
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noble gases
the very unreactive gases found in group 0 of the periodic table. Their atoms have very stable electronic structures
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nucleus
the very small and dense central part of an atom that contains protons and neutrons
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periodic table
an arrangement of elements in the order of their atomic numbers, forming groups and periods
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product
a substance made as a result of a chemical reaction
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proton
a tiny positive particle found inside the nucleus of an atom
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reactant
a substance we start with before a chemical reaction takes place
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shell
an area in an atom, around its nucleus, where electrons are found
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state symbol
the abbreviations used in balanced symbol equations to show if reactants and products are solid, liquid, gas or dissolved in water
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symbol equation
an equation that helps you see how much of each substance is involved in a chemical reaction by showing the chemical symbols and formulae of all the reactants and products involved
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word equation
a way of describing what happens in a chemical reaction by showing the names of all reactants and the products they form
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Other cards in this set
Card 2
Front
the smallest part of an element that can still be recognised as that element
Back
atom
Card 3
Front
the number of protons in an atom. it is sometimes called the proton number
Back
Card 4
Front
a symbol equation in which there are equal numbers of each type of atom on either side of the equation
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