MAGNETS
What are the two poles of a magnet?
North pole and South pole
What is the invisible area around a magnet called?
magnetic field
What is an electromagnet?
A magnet made using electricity
What is a chemical reaction?
A process where new substances are formed
What type of reaction releases heat?
What type of reaction absorbs heat?
Exothermic reaction
Endothermic reaction
What happens when two opposite poles come together?
They attract
Where is the magnetic force strongest on a magnet?
At the poles
What happens to an electromagnet when the current stops?
It loses magnetism
What are the starting substances in a reaction called?
What are the new substances formed called?
Reactants
Products
Burning is an example of what type of reaction?
Combustion reaction
Name one magnetic material.
Iron / Nickel / Cobalt
What do magnetic field lines show?
The direction and strength of the magnetic field
Name one use of electromagnets.
Doorbells / Speakers / Motors
Name one sign of a chemical reaction.
Color change / Gas produced / Temperature change / Light
What is rusting?
A reaction between iron, oxygen, and water
What happens when two similar poles come together?
They repel
In which direction do magnetic field lines move outside the magnet?
From North pole to South pole
How can you make an electromagnet stronger?
Add more coils or increase current
What gas is usually produced when an acid reacts with a metal?
Hydrogen gas
What can speed up a chemical reaction?
Higher temperature / Catalyst / Larger surface area
What device uses a magnetic needle to show direction?
A Compass
What can we use to see magnetic field patterns?
iron filings
What material is usually placed inside a coil to make a strong electromagnet?
Iron core
Is melting ice a chemical or physical change?
physical change
What is the word equation for magnesium reacting with oxygen?
Magnesium + oxygen → magnesium oxide