Experimenting Change
Published on Nov 19, 2015
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PRESENTATION OUTLINE
Melted Chocolate
- It is a physical change.
- It is reversible by cooling.
- Solid to liquid.
Melted chocolate is a physical change because it has only changed form and not created a new substance. It is reversible by cooling but it won't be the same shape. It will take the shape of it's container. The chocolate started as a solid chocolate block and changed to liquid melted chocolate. This change occurred by heating.
Photo by peter pearson
Burning Candle (wax)
- It is a physical change.
- It is reversible.
- Solid to liquid (wax).
A burning candle is a physical change because the wax can be returned to a solid by cooling and it hasn't created a new substance. It is reversible by cooling. The wax started as solid wax and change to liquid wax. This change occurred by heating.
Photo by SilverStack
Berocca and Water
- It is a chemical change.
- It is irreversible.
- Solid to liquid (tablet).
Berocca dissolving in water is a chemical change because a new substance has been formed. It is irreversible because it is a chemical change. The tablet starts as a solid and transforms into a liquid. This change occurred by mixing two substances together.
Melted Ice Block
- Physical change.
- Reversible by freezing.
- Solid to liquid.
A melted ice block is a physical change because the ice block has only changed form and not created a new substance. It is reversible by freezing. The ice block started as a solid and changed into a liquid ice block. This change occurred by heat.
Burnt Chocolate
- Chemical change.
- Irreversible.
- Liquid to solid (charcoal).
Burning chocolate is a chemical change because a new substance has been formed which is charcoal. It is irreversible because it is a chemical change. The chocolate started as liquid chocolate and changed into solid charcoal. This change occurred by too much heat.
Frozen Milk
- Physical change.
- Reversible by heating.
- Liquid to solid.
Freezing milk is a physical change because the milk has only changed form and not created a new substance. It is reversible by heating or just leaving it in a fridge to thaw. The milk started as a liquid and changed into a solid. This changed occured by freezing.
Salty Water
- Physical change.
- Reversible by heating.
- Solid to liquid (salt).
Salt mixed in water is a physical change because it is reversible. It is reversible by heating the salty water in a saucepan. The water started as solid salt and changed into a liquid. This change occurred by mixing two substances together.
Water, Bicarbonate of Soda and Citric Acid.
- Chemical change.
- Irreversible.
- Solid to liquid.
Mixing water, bicarbonate of soda and citric acid is a chemical change because you cannot change it back into it's natural form and it made a new substance when you mix it. It is irreversible because it is a chemical change. It started as a solid and changes into a liquid. This change occurred by mixing.
Spilt Vinegar
- Physical change.
- It is reversible by condensing.
- Liquid to gas.
Spilt vinegar is a physical change because it is reversible. It is reversible by trapping the vinegar into a condenser and it will go back into it's natural form. The vinegar started as liquid vinegar and changed into a gas when it evaporated into the atmosphere.
Theory
- We found it at 11:30am.
- At least 10 minutes.
We found the Mess when we walked in from first break at 11:30. I think that it had been there for at least 10 minutes because the chocolate was started to become hard and the Berocca wasn't fizzing.
