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Flashcards in Mock Key Words Deck (21)
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1

Isotope

Different atomic forms of the same element with the same number of protons but a different number of neutrons

2

Atomic number

The number of protons in the nucleus of an atom

3

Mass number

The number of protons and neutrons in the nucleus of an atom

4

Relative isotopic mass

The mass of an atom of an isotope compared with one-twelfth of the mass of an atom of carbon-12

5

Relative atomic mass

The weighted mean mass of an atom of an element compared with one-twelfth of the mass of an atom of carbon-12

6

Relative molecular mass

The ratio of the average mass of one molecule of an element or compound to one twelfth of the mass of an atom of carbon-12

7

Relative formula mass

The weighted average of the masses of the formula units relative to 1/12 of the mass of a carbon-12 atom

8

Mole

The amount of any substance containing as many particles as there are carbon atoms in exactly 12g of the carbon-12 isotope

9

Avogadro constant

The number of atoms per mole of the carbon-12 isotope

6.02 times 10^23

10

Molar mass

The mass per mole of a substance

Units- g mol^-1

11

Molar gas volume

The volume per mole of gas

Units- dm^3 mol^-1

12

Empirical formula

The simplest whole-number ratio of atoms of each element present in a compound

13

Molecular formula

Shows the numbers and types of the atoms of each element in a compound

14

Anhydrous

A substance that contains no water molecules

15

Water of crystallisation

Water molecules that form an essential part of the crystalline structure of a compound

16

Atom economy

Mr of the useful product divided by the Mr of all the reactants times by 100

17

Percentage yield

Actual amount in mol divided by theoretical amount in mol times by 100

18

Acid

A proton donor

Releases H+ in solution

19

Base

A chemical that can react with acids

Proton acceptor

20

Alkali

A chemical that reacts with an acid

Soluble in water, releasing hydroxide ions

21

Neutralisation

The reaction of an acid with a base