• Include PHASES CHANGES 
• e.g melting, freezing, condensation, boiling.

• 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.

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.

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.

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.

• 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 ………………… + ……………

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

……………...……… --> …………..……… + …………..

• Anhydrous copper (II) sulphate
• Cobalt (II) chloride

• 5 reactions - watch video and then fill in the notes
• 4 gases tests
• All the reactions follow in posts below: