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True or False: Recycled cotton fibre is made from cotton figbres of old jeans and t-shirts
True
True or False: Eco friendly fleece is soft, light and warm. It is not a great insulator
False
it behaves like plastic but it is biodegradable
shrilk
It is incredibly strong, and light. It is used to make solar cells and electronic components
Graphene
True or False: Fermentation is a chemical reaction caused by living beings.
True
True or False: Combustion happens when substances are burned. It needs oxygen and it produces a new substance called ash.
true
When a substance gains oxygen and a new substance called rust is produced this is called
oxidation
True or False: Chemical reactions create chemical changes in matter. These changes are reversible
False
When a gas changes directly into a solid without changing first into a liquid it is...
reverse sublimation
When gas changes into liquid it is called...
condensation
When a solid substance changes into a liquid it is....
melting
True or False: In physical change the original matter stays the same and new substances are made
False
They can change their shape and their volume
gases
True or False: Liquids can change their shape but not their volume
True
It can´t change its shape nor its volume. It´s a ......
solid
True or False: Evaporation is used to separate liquids that have different boiling points
False
______ is used to separate solids from liquids in homogeneous mixtures or solutions
Evaporation
True or False: Filtration is used to separate solids from liquids or solids with different sized particles
True
A solution is a...
homogeneous mixture of a solid dissolved in another substance
A homogeneous mixture in which one of the substances is a metal.
alloy
In this mixture we cannot see the separate substances
homogeneous
True or False: In heterogeneous mixtures we can´t see the separate substances
False
True or False: Pure substances are made up of just one type of matter.
true
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