When Ms. Goldbaugh cut her hair, did she make a physical change or a chemical change?
Physical Change - her hair will grow back.
100
Define conductors and insulators.
Conductors are materials that allow electrons to pass through them easily.
Insulators are materials that do not allow electrons to pass through them.
100
The area around a magnet where it can pull or push is called _________________
magnetic field
100
Are mixtures and solutions physical or chemical changes?
Physical Changes
200
How does the chemical structure of water change from liquid form to gas form?
The chemical structure does not change at all. It is still H2O.
200
When a liquid turns into a gas, it is called __________
evaporation
200
Which kind of electric current flows back and forth?
alternating current
200
What kind of magnet is a permanent magnet?
bar magnet
200
Give an example of a mixture and an example of a solution.
Answers will vary...
300
When a gas turns to a liquid, it is called ___________
condensation
300
List three clues that fireworks are a chemical change.
gas produced, new smell produces, light produced, cannot be undone, heat produced
300
How is a series circuit different from a parallel circuit?
A series circuit only has one path for electrons to flow. A parallel circuit has more than one path.
300
Which of these materials will a magnet attract?
copper
rubber
iron
plastic
Iron
300
A student has four items - an iron bar, a light bulb, a battery, and wire. Which three items will he need to use to make an electromagnet?
iron bar, battery, wire
400
What does adding heath to an object do to the atoms?
Gives the atoms more energy... makes them move more
400
The ability of a substance to react with other substances in a certain way is called a ________________
chemical property
400
Which kind of circuit do we use in schools and other buildings?
We use parallel circuits because they allow us to have some devices on and some devices off. In a series circuit, all the lights would have to be on or all off at the same time.
400
Name two advantages of electromagnets.
Poles can be switched
Can be turned on and off
Strength can be controlled
400
How could you separate a solution of salt and water?
You could boil it. The salt would be left behind after the water evaporates.
500
Explain what happens to the atoms in water as it freezes to ice.
The atoms slow down and stop moving as much. The become closer together.
500
When I brew coffee in the morning, is that a physical or chemical change?
Physical... it is a solution
500
Explain the sayings "if it's open it's broken" and "if it's closed it flows." What is broken? What flows?
If it's open it's broken means the device will not turn on because electric current cannot get to the device.
If it's closed it flows means electric current can flow to the device to power it/turn it on.
500
In order to work, an electromagnet must be part of a ______________