Lab Safety
You find broken glass on the lab floor. What should you do?
Tell the teacher and keep away from it.
In which state are the particles close together in fixed positions, only vibrating?
Solid
What is the change from a solid to a liquid called?
Melting
Which technique separates the different dyes in an ink?
Paper chromatography
What is the smallest particle of an element?
An atom
Why should you wear safety goggles during an experiment?
To protect your eyes from splashes.
Which state has no fixed shape and no fixed volume?
Gas
What is the change from a gas to a liquid called?
Condensation
A cup of salt water was left on the window and over a few days the only thing left in the cup was salt crystals. What happened to the water?
It evaporated
What is an element?
A substance made of only one type of atom.
What does the hazard word "flammable" mean?
It catches fire easily.
Which state has a fixed volume but takes the shape of its container?
Liquid
What happens to particles when a substance is heated?
They gain energy and move faster.
Dyes separate on the paper because they are...
Soluble
What is a compound?
Two or more different elements chemically joined together.
What is the safe way to smell a chemical?
Gently waft the vapour towards your nose with your hand.
Why can a gas be compressed (squashed)?
There are large gaps between its particles.
What is diffusion?
Particles spreading from a high concentration to a low concentration.
You would use this separating technique to separate sand from water.
Filtration
What is the chemical symbol for iron?
Fe
A chemical splashes into your eye. What should you do?
Rinse your eye with plenty of clean water for 20 minutes and have someone tell the teacher.
Why can a liquid flow?
Its particles can slide past each other.
Why does food colouring spread faster in warm water than in cold water?
The particles move faster, so they diffuse more quickly.
a physical separation process that purifies a liquid mixture by heating it to form vapor and then cooling that vapor to turn it back into a liquid
Distillation
What is a mixture?