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
Why is the start line drawn in ink, not pencil ?
Pencil does not dissolve in the solvent.
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 have a different what?
Solubility
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.
Which dye travels furthest up the paper?
The most soluble dye
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 and 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 black ink separates into 3 spots. What does this show?
The ink is a mixture of 3 dyes.
Oxygen gas (O2) is two oxygen atoms joined together. Is it an element or a compound?
An element (made of molecules)