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GCSE Chemistry > Symbols, Formulae And Equations > Flashcards

Symbols, Formulae And Equations Flashcards

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1
Q

Diatomic elements

A

Hydrogen (H2), nitrogen (N2), oxygen (O2), Fluorine (F2), Chlorine (Cl2), Iodine (I2)

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2
Q

How many atoms do diatomic elements have in each molecule

A

2

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3
Q

Ionic equations

A

Equations that can be written just using the ions involved

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4
Q

State symbols

A

(s) - solid
(l) - liquid
(g) - gas
(aq) - aqueous solution

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5
Q

What are elements represented by

A

Atomic Symbols (on the periodic table)

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6
Q

What are compounds represented by

A

Represented by formulae worked out using valency

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7
Q

Group 1 valency

A

1

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8
Q

Group 2 valency

A

2

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9
Q

Group 3 valency

A

3

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10
Q

Group 5 valency

A

3

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11
Q

Group 4 valency

A

4

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12
Q

Group 6 valency

A

2

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13
Q

Group 7 valency

A

1

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14
Q

Reactants

A

On left hand side of word equation

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15
Q

Products

A

On right hand side of word equation

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16
Q

How to write equations

A

Step 1) write word equation
Step 2) write relevant symbols and formulae underneath
Step 3) balance equation

17
Q

What is an element

A

A substance which is made of only one type of atom. They cannot be broken down into any simpler substance by chemical means

18
Q

What is a compound

A

A substance which consists of 2 or more different elements chemically bonded together

19
Q

What is a diatomic molecule

A

Two elements chemically bonded together (covalently). Some elements will naturally only exist as a diatomic molecule

20
Q

Valency definition

A

The combining power of an atom or an ion. The number of electrons a metal has to give away from its outer shell or a non-metal needs to gain to complete its outer shell. It is normally the number of the charge of the ion

21
Q

Molecular ion definition

A

Consists of more than one element but will act as a single ion

22
Q

Law of the conservation of mass

A

No atoms are lost or made in a chemical reaction. Instead, the atoms join together in different ways to form products

23
Q

Hydrochloric acid formula

A

HCl

24
Q

Nitric acid formula

A

HNO3

25
Q

Sulfuric acid formula

A

H2SO4

GCSE Chemistry (7 decks)

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