AQA Higher Tier Chemistry Ppaer

Define atom.

• The smallest part of an element that can still be recognised as that element

• A molecule made up of two or more elements

• A substance that cannot be broken down into simpler substances

• A particle that carries a positive charge

Define element.

• A substance made of only one type of atom

• A mixture of different substances

• A compound made of two or more elements

• A substance that can be separated by physical means

Define compound.

• A substance made of two or more different atoms chemically bonded together

• A single atom with no bonds

• A mixture of elements not chemically combined

• A physical blend of substances

Define molecule.

• A substance made of more than one atom chemically bonded together (can be atoms of the same type!)

• A single atom not bonded to any other atom

• A mixture of different substances not chemically combined

• A group of atoms physically mixed but not bonded

Define mixture.

• A substance made of more than one thing not chemically bonded together

• A pure substance made of only one type of atom

• A substance formed by a chemical reaction between two elements

• A liquid that cannot be separated into other substances

Define a chemical reaction.

• Chemical reactions involve the formation of one or more new substances.

• Chemical reactions do not change any substances.

• Chemical reactions only involve physical changes.

• Chemical reactions always produce heat.

Name the 4 separating techniques.

• filtration, crystallisation, distillation, chromatography

• filtration, evaporation, condensation, precipitation

• sublimation, melting, freezing, boiling

• decantation, sieving, magnetism, centrifugation

State the three subatomic particles.

• Protons, neutrons, electrons

• Protons, photons, electrons

• Neutrons, electrons, positrons

• Protons, neutrons, quarks

State the masses of the subatomic particles.

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State the relative charges of the subatomic particles.

• Protons: +1, neutrons: 0, electrons: -1

• Protons: 0, neutrons: -1, electrons: +1

• Protons: -1, neutrons: +1, electrons: 0

• Protons: +1, neutrons: -1, electrons: 0