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Physics > Compounds > Flashcards

Compounds Flashcards

1
Q

According to what are there rules for writing chemical formulae?

A

International Union of Pure and Applied Chemistry (IUPAC)

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2
Q

Why do compounds need names and formula?

A
  1. Can be overdosed

2. Clarity of which elements are present

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3
Q

Define chemical formula

A

Symbolic representation of a compound

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4
Q

What information does formulas give us?

A
  1. Name of compound
  2. Elements present
  3. Ratio of elements combined
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5
Q

Why should we understand how elements combine?

A

How they form compounds and how they affect things

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6
Q

When writing chemical formulae what do we use?

A

Valency - positive + negative

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7
Q

What do all halogens end with?

A

‘ide’

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8
Q

What do we use when writing formulae for non-transition metals?

A

Valency

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9
Q

When writing symbols of the elements for formulae. What goes first?

A

Metal goes first

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10
Q

What happens when there are two non-metals? formulae

A

Put the element furtherest to the left first (groups)

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11
Q

What happens when valency are the same?

A

They cancel = simplify

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12
Q

When writing formulae do the integer signs matter?

A

No. Used to indicate if receiving or giving ions. Formulae is positive

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13
Q

If a subscript is 1, what should happen?

A

Leave the 1 out

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14
Q

Define compounds

A

Consists of two or more different elements chemically bonded together in a fixed proportion

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15
Q

Which elements have more than one valency?

A

Transition metals

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16
Q

What is the formulae for transition metals written in?

A

Roman numerals

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17
Q

What happens when there is not stock notation?

A

Elements will have the valency of two

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18
Q

Why is silver an exception?

A

If no stock notation the valency will be one

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19
Q

I

A

1

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20
Q

II

A

2

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21
Q

III

A

3

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22
Q

IV

A

4 - iv drip

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23
Q

V

A

5 - vyf

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24
Q

VI

A

6

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25
Q

VII

A

7 - longer than six

26
Q

How do you identify if a numeral is positive or negative?

A

Look at the other elements

27
Q

What is the rule with integers?

A

There is always a positive and negative

28
Q

What is an ionic compound?

A

Metal + non-metal

29
Q

What is sign integer is a metal?

A

Positive

30
Q

What is sign integer is a non-metal?

A

Negative

31
Q

How do you write the chemical name for an ionic compound?

A

The metal is written first and retains its name. The nonmetal is after and changes as you add ‘ide’

32
Q

What happens if the first element is a transition metal in and ionic bond when naming it?

A

Include the stock notation

33
Q

What is a molecule compound?

A

Non-metal + non-metal

34
Q

What happens to the second element in a molecule?

A

Ends in ‘ide’

35
Q

What do you add to both element in a molecules?

A

Add pre-fixes to both elements

36
Q

Why do we add a prefixes to the molecules?

A

Specifies the number of atoms present

37
Q

Prefix 1

A

mono

38
Q

Prefix 2

A

di

39
Q

Prefix 3

A

tri

40
Q

Prefix 4

A

tetra

41
Q

Prefix 5

A

penta

42
Q

Prefix 6

A

hexa

43
Q

Prefix 7

A

hept

44
Q

What is the exception for the prefix mono?

A

Is left out from the first element

45
Q

What are polyatomic ions?

A

A common group of atoms that exist and behave as single units

46
Q

What do the atoms have to do with the ion?

A

An ion is made up of multiple atoms tightly bonded together

47
Q

Ammonium

A

NH4+

48
Q

Valency of Ammonium

A

+1

49
Q

Hydroxide

A

OH-

50
Q

Valency of Hydroxide

A

-1

51
Q

Nitrate

A

NO3-

52
Q

Valency of Nitrate

A

-1

53
Q

Sulphate

A

SO42-

54
Q

Valency of Sulphate

A

-2

55
Q

Carbonate

A

CO32-

56
Q

Valency of Carbonate

A

-2

57
Q

Phosphate

A

PO43-

58
Q

Valency of Phosphate

A

-3

59
Q

What does the name of the polyatomic ion mean?

A

The name stays the same, meaning no ‘ide’

60
Q

When do we bracket the polyatomic ion?

A

Add bracket if you cannot simplify

Physics (15 decks)

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