Chemistry Key Word Definitions (R)

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What is a reactant?
A substance we start with before a chemical reaction takes place.
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What is the reactivity series?
A list of elements in order of their reactivity. The most reactive element is put at the top of the list.
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What is reduction?
A reaction in which oxygen is removed (or electrons are gained).
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What is relative atomic mass, A_r?
The average mass of the atoms of an element compared with carbon-12 (which is given a mass of exactly 12). The average mass must take into account the proportions of the naturally occurring isotopes of the element.
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What is relative formula mass, M_r?
The total of the relative atomic masses, added up in the ratio shown in the chemical formula, of a substance.
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What is retention time?
The time it takes a component in a mixture to pass through the column during gas chromatography.
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What is a reversible reaction?
A reaction in which the products can re-form the reactants.
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Other cards in this set

Card 2

Front

What is the reactivity series?

Back

A list of elements in order of their reactivity. The most reactive element is put at the top of the list.

Card 3

Front

What is reduction?

Back

Preview of the front of card 3

Card 4

Front

What is relative atomic mass, A_r?

Back

Preview of the front of card 4

Card 5

Front

What is relative formula mass, M_r?

Back

Preview of the front of card 5
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