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What is a pure substance?
A pure substance is made up of one type of molecule.
Name two types of mixtures
Homegeneous and heterogeneous
What is a homogeneous mixture and give an example
Mixtures that have a consistent colour and texture ex. chocolate etc
What is a heterogeneous mixture and give an example
A mixture that has a varied colour and texture ex. a salad
What is a solution? Name the different parts.
Is a mixture of one or more liquids with one or more other substances. Solute and solvent.
Give an example of a solution and it's different parts.
Students own answer
Name three types of separation techniques.
Filtration, evaporation and distillation
Can we separate a chemically combined mixture?
No
How can we separate an insoluble solid from a mixture? and give an example
Filtration. Soil/coffee can be filtered from water
How can we seperate a soluble solid from a solution and give an example?
Evaporation. Salt from salt water through the heat from the sun.
How can we separate a liquid from a solution or two liquids? Give an example.
Distillation. Alcohol from water.
How can we seperate sand from sugar?
Filtration and evaporation
Can we reverse the effects of a chemical reaction?
No
What three things do you need for combustion to take place?
Oxygen, heat and fuel
What type of reaction produced thermal energy?
An exothermic reaction
Give three examples of combustion use in our everyday lives.
Students own answers
Give 3 examples of problems caused by combustion.
Global warming, respiratory illnesses and acid rain.
What is oxidation?
It is a chemical reaction in which an atom loses one or more electrons to another atom.
Can you describe what happens during the oxidation of a half eaten apple.
Students own answer
What do we call the oxidation of iron?
Rusting
What happens to a car when it starts to rust?
It turns orange/red and becomes brittle.
How can we prevent iron from rusting?
By painting it.
Can you think of an example where browning in fruit is desirable?
Turning grapes to raisins.
What three things can be used for fermentation?
Yeast, bacteria and microorganisms,
Is fermentation a physical or chemical change?
A chemical change
What is yeast?
It's a microscopic unicellular fungus
Explain what happens in the fermentation process of yeast.
yeast consumes sugar and converts it into alcohol and carbon dioxide
Name three things that can be made by fermentation.
Students own answers
Wha special fungus is sometimes added to cheese to make it softer?
penecillium


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