Chemistry Key Word Definitions (A)

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What is an acid?
A sour substance that can attack metal, clothing or skin. The chemical opposite of an alkali. When dissolved in water, its solution has a pH number less than 7. Acids are proton (H+ion) donors.
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What is activation energy?
The minimum energy needed to start off a reaction.
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What are alkali metals?
Elements in Group 1 of the periodic table, e.g. lithium (Li), sodium (Na), potassium (K).
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What is an alkali?
A substance which, when dissolved in water, its solution has a pH number more than 7.
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What is an alkane?
Saturated hydrocarbon with the general formula C_(n ) H_(2n+2) for example methane, ethane and propane.
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What is an alkene?
unsaturated hydrocarbon which contains a carbon-carbon double bond. The general formula is C_(n ) H_2n for example ethene C_(2 ) H_4.
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What is an alloy?
A mixture of metals (and sometimes non-metals). For example, brass is a mixture of copper and zinc.
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What is aluminium?
A low density, corrosion-resistant metal used in many alloys, including those used in the aircraft industry.
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Anhydrous....?
Describes a substance that does not contain water.
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What is an aqueous solution?
The mixture made by adding a soluble substance to water.
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What is the atmosphere?
The relatively thin layer of gases that surround planet Earth.
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What is an atom?
The smallest part of an element that can still be recognised as that element.
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What is the atomic number?
The number of protons (which equals the number of electrons) in an atom. It is sometimes called the proton number.
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What is atomic weight?
The historical term that was used before relative atomic masses were defined in the 20th century. See Relative atomic mass, A_r.
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Card 2

Front

What is activation energy?

Back

The minimum energy needed to start off a reaction.

Card 3

Front

What are alkali metals?

Back

Preview of the front of card 3

Card 4

Front

What is an alkali?

Back

Preview of the front of card 4

Card 5

Front

What is an alkane?

Back

Preview of the front of card 5
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