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Chemistry Unit 1 > 1 - Chemical Quantities > Flashcards

1 - Chemical Quantities Flashcards

1
Q

Elements

A

The simplest chemicals - they cannot be broken down into simpler chemicals.

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2
Q

Compounds

A

Chemicals containing two or more elements chemically combined together.

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3
Q

Atom

A

The smallest particle of an element.

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4
Q

Molecule

A

A particle containing two or more atoms joined together chemically.

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5
Q

Ion

A

An atom, or a group of atoms, which has become electrically charged by the loss or gain of one or more electrons.

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6
Q

Molecular Formula

A

Shows the number of atoms of the different elements in one molecule of a compound.

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7
Q

Empirical Formula

A

Shows the simplest whole number ratio of the atoms of different elements in a compound.

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8
Q

Spectator Ions

A

Ions which take no part in a reaction.

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9
Q

Acids

A

Substances which donate hydrogen ions.

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10
Q

Bases

A

Substances which accept hydrogen ions.

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11
Q

Alkalis

A

Soluble bases.

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12
Q

Salts

A

Ionic compounds formed when an acid reacts with a base.

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13
Q

Relative molecular mass

A

The sum of the relative atomic masses of all the atoms in the molecular formula.

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14
Q

Relative formula mass

A

The sum of the relative atomic masses of all the atoms in the formula.

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15
Q

Molar mass

A

The mass of one mole of a chemical (g/mol).

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16
Q

Avogadro Constant

A

The number of atoms, molecules or formula units in one mole of any substance. It is 6.02 x 10^23.

17
Q

Molar volume

A

The volume of 1 mole of a gas. At room temperature and pressure it is 24 dm^3/mol.

18
Q

Actual yield

A

The mass of product obtained.

19
Q

Theoretical yield

A

The mass of product obtained if the reaction goes according to the equation.

20
Q

Percentage yield

A

(Actual yield / theoretical yield) x 100

21
Q

Limiting reactant

A

A substance which is present in an amount which limits the theoretical yield.

22
Q

Atom Economy

A

(Mass of atoms in desired product / mass of atoms in all reactants) x 100

Chemistry Unit 1 (6 decks)

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