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National 5 Chemistry > Unit 1 - Topic 4 - Writing Chemical Formulae > Flashcards

Unit 1 - Topic 4 - Writing Chemical Formulae Flashcards

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1
Q

What are all substances made up of?

A

Atoms

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2
Q

What is an element?

A

A substance made from one kind of atom only.

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3
Q

What are unreactive elements called?

A

Monoatomic elements

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4
Q

Describe monoatomic elements

A

Monatomic means that an element is made from single atoms that are not joined together. Group 0 are the monatomic elements.

The formulae of the monatomic elements are just their symbol.

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5
Q

How many diatomic molecules are there?

A

7

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6
Q

Name all the diatomic molecules

A 
Hydrogen
Fluorine
Chlorine
Bromine
Iodine
Oxygen
Nitrogen
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7
Q

What are all group 7 elements?

A

Diatomic Molecules

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8
Q

Why is Astatine not considered a diatomic element?

A

Because it is a man-made element.

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9
Q

What are diatomic molecules?

A

Diatomic means a molecule made from two atoms. If both atoms in the molecule are the same, the molecule is an element.

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10
Q

What is a molecule?

A

A molecule is a group of two or more atoms, which are joined together. The smallest molecule is made from two atoms, a diatomic molecule.

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11
Q

How many type of molecules are there?

A

2

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12
Q

What are the different types of molecules?

A

Element Molecule – All the atoms in the molecule are the same type.

Compound Molecule – Different atoms are joined together.

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13
Q

What are bonds?

A

Attractive forces which hold atoms together in a molecule.

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14
Q

How are mixtures formed?

A

When different elements are put together, but they do not react and join.

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15
Q

How are compounds formed?

A

When different elements (atoms) react and join together

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16
Q

What is a compound?

A

A compound is a substance made from different atoms joined together.

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17
Q

How many elements do compounds ending in -ide have in them?

A

2

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18
Q

How many elements do compounds ending in -ite or -ate have in them?

A

3, one of which is always Oxygen

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19
Q

What is the combining power of an atom called?

A

Valency

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20
Q

What is the valency of an atom?

A

The number of bonds an atom can make.

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21
Q

What valency do group 1 elements have?

A

1

22
Q

What valency do group 2 elements have?

A

2

23
Q

What valency do group 3 elements have?

A

3

24
Q

What valency do group 4 elements have?

A

4

25
Q

What valency do group 5 elements have?

A

3

26
Q

What valency do group 6 elements have?

A

2

27
Q

What valency do group 7 elements have?

A

1

28
Q

What valency do group 8 elements have?

A

0

29
Q

What valency do transition elements have?

A

Often 1

30
Q

What valency does Hydrogen have?

A

1

31
Q

Mono-

A

1

32
Q

Di-

A

2

33
Q

Tri-

A

3

34
Q

Tetra-

A

4

35
Q

Penta-

A

5

36
Q

Hex-

A

6

37
Q

Hept-

A

7

38
Q

Oct-

A

8

39
Q

Non-

A

9

40
Q

Dec-

A

10

41
Q

What is the valency of the Ammonium Group?

A

1

42
Q

What is the valency of the Hydroxide Group?

A

1

43
Q

What is the valency of the Nitrate Group?

A

1

44
Q

What is the valency of the Carbonate Group?

A

2

45
Q

What is the valency of the Sulphate Group?

A

2

46
Q

What is the valency of the Phosphate Group?

A

3

47
Q

What is the valency of Zinc?

A

2

48
Q

What is the valency of Silver?

A

1

49
Q

What does ionic mean?

A

It is made from ions not neutral atoms.

50
Q

What is an ionic formula?

A

A type of formula that includes the charges on the ions from which it is made.

51
Q

What does the valency equal to?

A

The size of the charge on an ion.

National 5 Chemistry (15 decks)

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