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S2 flashcards > Science Chemical Change > Flashcards

Science Chemical Change Flashcards

1
Q

Physical change

A

type of change where the physical properties of matter change.
- No new product
-easily reversible
-Atoms are not rearranged

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2
Q

Chemical change

A

a change of materials into another, new materials with different properties and one or more than one new substances are formed.
-new product formed
-atoms are rearranged

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3
Q

Reactants

A

the substance present at the start of a chemical reaction.

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4
Q

Products

A

the substances formed by chemical reactions

A+B->AB

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5
Q

For a chemical reaction to occur the …. between ….. must be ……

A

For a chemical reaction to occur the bonds between atoms must be broken.
AB+C->A+BC

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6
Q

Names for Formulas

A

most formulas are based directly on the name of the substance. The ending of the last element has been changed to ide.
Magnesium +Flourine
MgF-> Magnesium Flouride

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7
Q

mono

A

1

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8
Q

di

A

2

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9
Q

tri

A

3

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10
Q

treta

A

4

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11
Q

penta

A

5

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12
Q

hexa

A

6

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13
Q

hydrogen

A

H+

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14
Q

lithium

A

Li+

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15
Q

sodium

A

NA+

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16
Q

potassium

A

K+

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17
Q

silver

A

Ag2+

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18
Q

magnesium

A

Mg2+

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19
Q

Calcium

A

Ca2+

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20
Q

Barium

A

Ba2+

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21
Q

Zinc

A

Zn2+

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22
Q

Aluminum

A

Al3+

23
Q

Fluoride

A

F-

24
Q

chloride

A

Cl-

25
Q

bromide

A

Br-

26
Q

iodide

A

I-

27
Q

oxide

A

O2-

28
Q

sulfide

A

S2-

29
Q

ammonium

A

NH4+

30
Q

Hydroxide

A

OH-

31
Q

Carbonate

A

CO3 2-

32
Q

nitrate

A

NO3

33
Q

Phosphate

A

PO4 3-

34
Q

Sulfate

A

SO4 2-

35
Q

hexa

A

6

36
Q

Solid

A

(S) (frozen,hard, powder,turnings)

37
Q

Liquid

A

(L)

38
Q

Gas

A

(G) steam, bubble, fizz

39
Q

Aqueous

A

(Aq) something dissolved in water) (Solution, Aqueos, dissolved)

40
Q

Ionic formula

A

drop it and swap it

41
Q

The law of conservation of mass

A

The law of conservation of mass states that matter can neither be created or destroyed in a chemical reaction but transferred or transformed.

42
Q

The law of conservation of mass Atoms

A

During a chemical change there is no loss or gain of atoms.

43
Q

The law of conservation of mass Equation

A

In an equation you must have even amounts of elements on both sides.

44
Q

Exothermic

A

In an exothermic reaction heat light or electricity is released into the surroundings. When heat is released the surroundings become hot.
Eg. A fire giving of heat, freezing ice, water and calcium chloride

45
Q

Endothermic

A

In an endothermic reaction heat
is absorbed from the surroundings
and they become cold.
eg. snowman melting, melting, boiling

46
Q

Combustion

A

metals react with oxygen

47
Q

Combustion formula

A

Fuel + Oxygen -> carbon dioxide + water

48
Q

Combustion reaction rates

A

Some combustion reactions happen very fast eg an explosion. Combustion can happen at different rates. An example of a slow reaction is putting gas in a gas bottle and using it to cook something while camping.

49
Q

All metals react apart from…..

A

Gold and silver

50
Q

Acids

A

substances taste sour and can burn. All aciids have similar chemical properties. acids react with most metals.

51
Q

Base

A

taste bitter and feel soapy.

52
Q

alkaline

A

bases that dissolve in water

53
Q

indicators

A

Indicators are substances
that have a different
colour in an acid or a base.
Universal indicator is a
mixture of many indicators.
It is used to indicate the
strength of the acid or base.

54
Q

Ph

A

The pH scale lets us see the relative acidity or alkalinity of a solution
The stronger the acid the lower
the pH
The stronger the base the higher
the pH

S2 flashcards (4 decks)

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