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Magic sand

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Physical and Chemical Changes   GCSE Chemistry

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SUMMARY - DIFFERENCE BETWEEN A PHYSICAL AND CHEMICAL CHANGE

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SUMMARY - DIFFERENCE BETWEEN A PHYSICAL AND CHEMICAL CHANGE

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1.
Physical changes:

Include PHASES CHANGES

e.g melting, freezing, condensation, boiling.

2.
Chemical changes (FILL IN):

There are 2 types of chemical changes: ……………………… and ……………………… .

……………………… …………………... absorb energy throughout the reaction whereas ……………… ……………………. give out (release) energy during the reaction.

Some ………………….. ………………… require a little energy to start the reaction after which energy is given out.

This energy is called activation energy.

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What Are Endothermic & Exothermic Reactions | Chemistry | FuseSchool

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You are going to look at reactions that illustrate chemical changes, some also illustrating physical changes:

5 reactions - watch video and then fill in the notes

4 gases tests

All the reactions follow in posts below:

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REACTION 1: Mercuric oxide thermally decomposing.

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REACTION 1: Mercuric oxide thermally decomposing.

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Watch this video. Then answer fill-in questions in your notes.

Drawing of apparatus:

Mercuric oxide is a bright ………….. coloured powder.

When heated it first turns ………………….

This is a ……………change because after the reaction, any ………………. powder left turns to ………………. mercuric oxide again.

We then see a ………………. coloured ………………….. forming on the cooler parts of the test tube.

This ……………… is mercury.

……………... gas is given off and this can be tested by putting a ………………… in the mouth of the test tube and it ……………………………………………….

WORD EQUATION:

……………………. --> ……………….. + ……………………….

NB Check the points above to show that the reaction is a chemical change which is endothermic.

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North Carolina School of Science and Mathematics

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Decomposition Mercury (II) Oxide and Oxygen

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Watch this video.

FILL IN:

Copper carbonate is a ……………….. powder.

When heated it turns …………………. .

This ………………. substance is ……………..……………………

A gas is given off which can be bubbled through ……………. ………………. ……………………

and it turns ……………… .

This shows that the gas is ………….. ……………….

WORD EQUATION:

…………… ……..………. --> ……..…… …………… + .…..…… ………...

This is a ……....…thermic chemical reaction.

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FILL IN:

When ammonium carbonate is heated, there is a strong smell of …………….. .

Carbon dioxide is also given off and this can be proved by ……………………………………………………………………….

While the ammonium carbonate is being heated, ……………………….…………………….. forms on the cooler parts of the test tube. After a while nothing is left in the test tube.

WORD EQUATION:

…………...... ………...….. à ………….…..… + …………….….. + …………… …..……..

This is a …............……thermic chemical reaction.

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Ammonium carbonate (NH4)2CO3 thermal decomposition; tests for NH3, H2O and CO2 which are formed

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REACTION 4: Electrolysis of copper(II)chloride solution

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REACTION 4: Electrolysis of copper(II)chloride solution

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FILL IN:

Copper(II)chloride consists of ………………. crystals.

We dissolve it in water in a beaker and it will form a ……………….. solution.

We put 2 graphite (carbon) electrodes into the solution and connect each electrode to the respective positive and negative terminals of a battery.

DIAGRAM

When current flows, …………… is formed on the …………………. electrode

and bubbles of ………………… …………………….. gas are given off

from the ………………….. electrode.

This gas smells like …………… .

This reaction is an ……………… chemical reaction

because ……………….. energy is taken in during the chemical reaction.

WORD EQUATION

…………… …………… à ………………… + ……………

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Electrolysis of Copper Chloride solution National 5

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We use a Hoffmann Voltameter apparatus:

FILL IN:

We pass an electric current through a ………………….. solution of ………………. ………………. in water.

Bubbles of gas come from both electrodes.

……………… is formed at the positive electrode and …………………. is formed at the negative electrode.

The volume of the hydrogen is …………….. that of the oxygen. (H2O)

This is an ………………… chemical reaction.

WORD EQUATION

……………...……… --> …………..……… + …………..

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Electrolysis: Producing hydrogen from water

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REACTION 5: ELECTROLYSIS OF WATER IN A HOFMANN VOLTAMETER

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REACTION 5: ELECTROLYSIS OF WATER IN A HOFMANN VOLTAMETER

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OXYGEN, HYDROGEN, CARBON DIOXIDE, & CHLORINE GAS

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GCSE Science Chemistry (9-1)  - Tests for Gases

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Use:

Anhydrous copper (II) sulphate

Cobalt (II) chloride

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Testing For Water | Chemical Tests | Chemistry | FuseSchool

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Phase Changes: Exothermic or Endothermic?

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PHYSICAL VS CHEMICAL CHANGE - POWERPOINT

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PHYSICAL VS CHEMICAL CHANGE - POWERPOINT