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Intermediate 1 Unit 1 b Revision Chemical Reactions PowerPoint PPT Presentation


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Intermediate 1 Unit 1 b Revision Chemical Reactions. Change In Appearance. Sodium iodide solution and lead nitrate solution are both colourless. When they are mixed together they react and a yellow solid, lead iodide, is formed.

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Intermediate 1 Unit 1 b Revision Chemical Reactions

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Intermediate 1 unit 1 b revision chemical reactions

Intermediate 1

Unit 1 b Revision

Chemical Reactions


Intermediate 1 unit 1 b revision chemical reactions

Change In Appearance

Sodium iodide solution and lead nitrate solution are both colourless.

When they are mixed together they react and a yellow solid, lead iodide, is formed.

We know a reaction has occurred because there is a change in appearance.


Intermediate 1 unit 1 b revision chemical reactions

Energy Change

When magnesium is placed in a bunsen flame it catches fire and burns very brightly.

We know a reaction has occurred because there is an energy change, here heat and light are given out.

We also see a change in appearance of the magnesium, it turns from a grey metal to a white powder, magnesium oxide.


Intermediate 1 unit 1 b revision chemical reactions

It’s A Gas

When Alka Seltzer is added to water it reacts and gives off a gas.

We know a reaction has occurred because there is a gas given off.


Intermediate 1 unit 1 b revision chemical reactions

Chemical Reactions

There are three ways to tell when a reaction has taken place

there is a change in appearance

there is an energy change

a gas is given off.

When a chemical reaction takes place at least one new compound is formed.


Intermediate 1 unit 1 b revision chemical reactions

Reaction Or No Reaction

Try to predict what will fill the blank before you reveal it.


Intermediate 1 unit 1 b revision chemical reactions

Speed Of Reactions

Different reactions proceed at different rates (speed).


Intermediate 1 unit 1 b revision chemical reactions

Changing Reaction Rate

The rate (speed) of a reaction can be changed if we

a)change the particle size of the reactants

or

b)change the temperature

or

c)change the concentration of the reactants.


Intermediate 1 unit 1 b revision chemical reactions

Changing Particle Size

Smaller particles react faster than larger particles.

Wood shavings burn faster than wooden branches.

Mince cooks quicker than casserole steak.


Intermediate 1 unit 1 b revision chemical reactions

Changing Temperature

The higher the temperature the faster the reaction.

The exhaust system of a car rust quicker than the body because the exhaust gases are very hot.

The low temperature in a fridge slows down the reaction that turns milk sour.


Intermediate 1 unit 1 b revision chemical reactions

Changing Concentration

The higher the concentration the fastert the reaction.

Concentrated bleach kills germs faster than dilute bleach.


Intermediate 1 unit 1 b revision chemical reactions

Catalysts

A catalyst speeds up a reaction but does not react itself. The catalyst can be used again and again and again, etc.

All cars have a catalytic converter in their exhaust system.

The catalyst in the converter turns harmful gases into harmless ones.

The catalytic converter works whenever the engine is running.


Intermediate 1 unit 1 b revision chemical reactions

Enzymes

Enzymes are biological catalysts that speed up reactions in living things.


Intermediate 1 unit 1 b revision chemical reactions

Writing Word Equations

When calcium is placed in water it reacts to form calcium hydroxide, hydrogen gas is also given off.


Intermediate 1 unit 1 b revision chemical reactions

Writing Word Equations

When calcium is placed in water it reacts to form calcium hydroxide, hydrogen gas is also given off.

calcium


Intermediate 1 unit 1 b revision chemical reactions

Writing Word Equations

When calcium is placed in water it reacts to form calcium hydroxide, hydrogen gas is also given off.

calcium

+ water


Intermediate 1 unit 1 b revision chemical reactions

Writing Word Equations

When calcium is placed in water it reacts to form calciumhydroxide, hydrogen gas is also given off.

calcium

+ water

________>

calcium hydroxide


Intermediate 1 unit 1 b revision chemical reactions

Writing Word Equations

When calcium is placed in water it reacts to form calcium hydroxide, hydrogen gas is also given off.

calcium

+ water

________>

calcium hydroxide

+ hydrogen


Intermediate 1 unit 1 b revision chemical reactions

Writing Word Equations

When magnesium burns in oxygen a white powder called magnesium oxide is formed.

magnesium


Intermediate 1 unit 1 b revision chemical reactions

Writing Word Equations

When magnesium burns in oxygen a white powder called magnesium oxide is formed.

magnesium

+ oxygen


Intermediate 1 unit 1 b revision chemical reactions

Writing Word Equations

When magnesium burns in oxygen a white powder called magnesium oxide is formed.

magnesium

+ oxygen

________>

magnesium oxide


Intermediate 1 unit 1 b revision chemical reactions

Writing Word Equations

When magnesium burns in oxygen a white powder called magnesium oxide is formed.

magnesium

+ oxygen

________>

magnesium oxide

If we heat green copper carbonate it produces black copper oxide and carbon dioxide gas.


Intermediate 1 unit 1 b revision chemical reactions

Writing Word Equations

When magnesium burns in oxygen a white powder called magnesium oxide is formed.

magnesium

+ oxygen

________>

magnesium oxide

If we heat green copper carbonate it produces black copper oxide and carbon dioxide gas.

copper carbonate


Intermediate 1 unit 1 b revision chemical reactions

Writing Word Equations

When magnesium burns in oxygen a white powder called magnesium oxide is formed.

magnesium

+ oxygen

________>

magnesium oxide

If we heat green copper carbonate it produces black copper oxide and carbon dioxide gas.

copper carbonate

________>

copper oxide


Intermediate 1 unit 1 b revision chemical reactions

Writing Word Equations

When magnesium burns in oxygen a white powder called magnesium oxide is formed.

magnesium

+ oxygen

________>

magnesium oxide

If we heat green copper carbonate it produces black copper oxide and carbon dioxide gas.

copper carbonate

________>

copper oxide

+carbon dioxide


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