The Reactions
1. Put two marble chips into a test tube.
Add enough hydrochloric acid to just cover them.
If a gas is made, collect it and test it for carbon dioxide.
Do the temperature test.
Do the pH test.
2. Put 1 cm of coiled magnesium ribbon into a test tube.
Add enough hydrochloric acid to just cover it.
If a gas is made, collect it and test it for hydrogen.
Do the temperature test.
Do the pH test.
3. Put 1 cm height of sodium hydroxide into a test tube.
Add 1 cm height of hydrochloric acid.
If a gas is made, collect it and test it for hydrogen.
Do the temperature test.
Do the pH test.
The Tests
Hydrogen
Take the stopper out of the test tube filled with your mystery gas and
put a lighted wooden splint into the top. A squeaky pop shows that the
gas is hydrogen because hydrogen is an explosive gas.
Carbon dioxide
Take the stopper out of the test tube filled with your mystery gas and
put a squirt of limewater in. Put the stopper back on and shake the
tube. If the limewater goes cloudy, the gas was carbon dioxide.
pH
Put a squirt of full range indicator into the tube. Use the pH chart to
find out the pH of the test substance and use it to work out if it is acid,
alkali or neutral.
Temperature
Use a thermometer to find out if the mixture is warmer or colder than
room temperature.
The Report
The Hard Bit
Each reaction must be fully reported before starting the next one.
Try to write an equation to describe each reaction.
Each equation will have the same framework.
Report the reaction using the following headings:
reactant + reactant  product + product



What I did
What I observed
What I think happened
The chemical names of the substances in each reaction will be
displayed on the board for you to choose from.