Mixtures
What do we call a blend of substances that aren’t chemically bonded?
mixture
Which tool helps pull out iron pieces from sand?
Magnet
What is magnetism?
A pull on certain metals
What is the invisible area around a magnet where force is felt?
Magnetic field
When electricity and magnetism work together, it’s called:
Electromagnetism
Which of these statements is true about mixtures?
a) They form one pure substance
b) The parts keep their individual traits
c) All parts combine into new substances
b) The parts keep their individual traits
What do we use in filtration to trap solids?
a filter
A magnet that always has magnetic power is called:
Permanent magnet
A paperclip becomes magnetic after rubbing with a magnet because it’s a(n):
Induced magnet
What tool uses electricity to create a temporary magnet?
Electromagnet
A mixture that looks the same throughout is called
Homogeneous
What method would best separate a solid that doesn’t dissolve in water?
Filtration
Which mineral is naturally magnetic?
Magnetite
What material can we sprinkle on paper to see a magnet’s field?
Iron filings
What makes an electric current flow?
Moving electrons
Which example is a uniform mixture where you can’t see the parts?
E.g. Salt water
What process involves boiling a liquid and capturing its steam?
Distillation
What happens when two magnets with the same poles meet?
Repel
A magnet can work even if it:
Doesn’t touch the object
What happens to an electromagnet when the power source is removed?
It loses its magnetism
In which mixture can you easily spot the different components?
E.g. A Salad
Which process is useful for separating different colored dyes?
Chromatography
Which metal is not affected by magnets?
E.g. aluminum
Name an example of a magnet’s force through a surface?
Holding a paper on a fridge
Why are electromagnets useful?
They can be switched on and off