Show:
Physical and Chemical Changes
States of Matter
Electric Charges
Charges and Electricity
Random
100
During what type of change does matter change its size and shape?
Physical
100
When ______ is added water changes from a liquid to gas.
heat
100
An electric charge can be either ________ or _________.
Positive or Negative
100
If you were to rub a wool cloth on a balloon, the balloon would then become __________ charged.
Negatively
100
How can you get rid of static electricity quickly.
Touch something of the opposite charge
200
Freezing and melting are a physical changes. True or False
True
200
If enough heat is removed from liquid water, the water may ________.
Freeze
200
Define what 'attract' is. Give the two types of charges that attract to each other
Attract means to pull toward. Positive and negative attract one another. Unlike charges attract!
200
Explain how the distance between charges affects the pull.
The closer they are in distance, the stronger the pull/push
200
Define static electricity
The build up of pos. or neg. charges on an object
300
John burned his stack of papers that was 20g. Afterwards, the mass of the ashes was 18g. What type of Change took place and why is the mass of the ashes less than the papers?
chemical Change took place. Some matter turned to gas, which is why the mass of the ashes are less.
300
Why does ice melt more slowly in a thermos?
Insulation
300
Define 'repel' and tell which types of charges repel one another.
Repel means to push apart. Like charges repel. Negative repels negative. Positive repels positive.
300
If a charged object becomes neutral, explain how that could have happened.
What is Negative charges of the object get slowly picked up by water particles in the air
300
Condensation is a Change from _____ to _______ Evaporation is a Change from _______ to ______
Cond. gas to liquid Evap. liquid to gas
400
give an example of a chemical Change.
Examples: burning Wood, cooking, decaying of leaves
400
What is an insulator. Give 2 examples of an insulator
A material that slows the flow of heat. Examples: Plastic, jacket, rubber...
400
Define static electricity. When does 'static cling' happen?
The buildup of positive or negative charges on an object Static cling happens when clothes having opposite charges stick to each other.
400
What does it mean to say that an object is neutral?
A neutral object has no overall charge which means they have an equal amount of positive and negative charges.
400
Define repel. Define attract.
Repel: push apart attract: pull towards
500
Define what a chemical change is and what a physical change is.
Physical change: A change in physical properties that does not change the type of matter Chemical change: A change that results in a new type of matter
500
What type of changes are Condensation and Evaporation?
physical
500
Explain the 3 things that happens when clothes coming out of the dryer cling together.
1. Different pieces of clothing rub against each other 2.Neg. charges move from one item to the others. Now some are Overall negative or Overall postitive 3. Oppositely charged items attract and 'cling' together.
500
If two people touch and feel a mild shock, what was it caused by?
The difference in charge between the two people/static electricity
500
Condensation: when a gas _________ heat Evaporation: when a gas _________ heat.
C: loses E: gains