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Science > Chemistry Definitions > Flashcards

Chemistry Definitions Flashcards

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1
Q

Alkali metals

A

Group 1 elements

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2
Q

Alkanes

A

Saturated hydrocarbons

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3
Q

Alloy

A

A mixture with at least 1 metal

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4
Q

Anode

A

Positively charged electrode

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5
Q

Atom

A

The smallest quantity of an element that can take part in a chemical reaction

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6
Q

Atomic number

A

Number of protons in the atoms nucleas

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7
Q

Avogrado constant

A

The number of particles in one mole of any substance

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8
Q

Boiling point

A

The specific temperature where a pure substance changes state from liquid to gas to gas to liquid

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9
Q

Cathode

A

A negatively charged electrode

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10
Q

Charge

A

A property of matter that causes it to experience a force when placed in an electric field

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11
Q

Chromatography

A

A separation technique used to separate the coloured components of mixtures

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12
Q

Combustion

A

Burning

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13
Q

Conservation of mass

A

The total mass of the products of a chemical reaction is always equal to the total mass of the reactants

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14
Q

Covalent bond

A

A shared pair of electrons between atoms in a molecule

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15
Q

Crystallisation

A

Technique used to obtain a soluble solid from a solution

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16
Q

Diamond

A

A form of carbon, a hard and giant covalent structure

17
Q

Displacement reaction

A

A reaction which a more reactive metal displaces a less reactive metal from a solution of its salt

18
Q

Ecosystem

A

Organisms in living/ non - living parts of the habitat

19
Q

Electrostatic

A

Force of attraction between oppositely charged species

20
Q

Element

A

A substance made of 1 type of atom

21
Q

Equilibrium

A

When the rate of forward reaction is equal to the rate of backwards reaction

22
Q

Exothermic reaction

A

A reaction which gives out energy to its surroundings

23
Q

Filtration

A

Separation techniques used to separate insoluble and soluble solids

24
Q

Fractional distillation

A

A separation technique used to separate mixtures with components that have similar boiling points

25
Q

Half equation

A

Used to show what happens to one of the reactants in a chemical reaction

26
Q

Halogens

A

Group 7 elements

27
Q

Hydrocarbon

A

A molecule with only carbon and hydrogen atoms

28
Q

Ionised

A

Split into atoms

29
Q

Ionising

A

Refers to radiation that can cause atoms to lose of gain atoms becoming ions

30
Q

Isotope

A

Describes atoms of the same element that have the same atomic number but a different mass number

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