The document contains instructions and observations for 5 student groups to conduct experiments on reversible and irreversible changes. Group 1 mixes different substances with water, vinegar or lemon juice to observe if reactions are reversible or irreversible. Group 2 burns different materials to observe changes. Group 3 heats materials to observe melting or other changes. Group 4 uses plaster of Paris and notes its properties. Group 5 observes dough rising before and after leaving it to rise.

1. Group 1 - MIXING
Reversible and Irreversible Changes
Materials Prediction Reversible / Irreversible? Observation after mixing
Bicarbonate of
soda + water
Bicarbonate of
soda + vinegar
Soda +
lemon juice
Soda +
vinegar
Soda +
water
Baking powder +
water
Which of the three liquids tend to dissolve the solids?
Which of the three liquids tend to react with them/makes gases?
What is the name of this type of liquid?
Why does the baking powder react differently with water?
Group 2 - BURNING

2. Reversible and Irreversible Changes
Material Appearance before Reversible / Observation after Reversible /
burning Irreversible? How? burning Irreversible? How?
Paper
Metal
Candle
String
Wood
Plastic
Charcoal
Fabric
Group 3 - HEATING

3. Reversible and Irreversible Changes
Material Appearance before Reversible / Observation after burning Reversible /
heating Irreversible? Irreversible? How?
Chocolate
Butter
Bread
Ice
Bread dough
Sugar
Wax
Salt Water
Word bank – melt, toast, burn, change colour, cook
Group 4 – Plaster of Paris
Reversible and Irreversible Changes

4. Write and draw about what happens when using Plaster of Paris?
Write and draw about what other substances that have similar properties to plaster e.g.
cement, be used for?
Group 5 – BAKING
Reversible and Irreversible Changes

5. Before leaving dough to rise After dough is left to rise
Height
Diameter
Weight
(remember to take away the
weight of container from
total)
Write and draw about what happened when making dough rise?
Word bank – dough, rise, risen, bake, ingredients, knead,

6. Before leaving dough to rise After dough is left to rise
Height
Diameter
Weight
(remember to take away the
weight of container from
total)
Write and draw about what happened when making dough rise?
Word bank – dough, rise, risen, bake, ingredients, knead,

7. Before leaving dough to rise After dough is left to rise
Height
Diameter
Weight
(remember to take away the
weight of container from
total)
Write and draw about what happened when making dough rise?
Word bank – dough, rise, risen, bake, ingredients, knead,

8. Before leaving dough to rise After dough is left to rise
Height
Diameter
Weight
(remember to take away the
weight of container from
total)
Write and draw about what happened when making dough rise?
Word bank – dough, rise, risen, bake, ingredients, knead,