A mixture that appears to be the same throughout is called a?
homogenous mixture
100
define a gas in terms or volume and shape
no definite volume and no definite shape
100
Why are scientific models important?
The help visualize things that are complex, very large, or very small.
100
How are science and technology related?
Advances in science may lead to advances in technology and vice versa.
200
How is 0.00069 written in scientific notation?
6.9 X 10^-4
200
What is viscosity and give an example of something that has a high viscosity.
The resistance to flow Example: syrup
200
force distributed over an area is?
pressure
200
99% of all matter in the universe is what state of matter?
plasma
300
What is a substance made up of only one kind of atom?
An Element
300
How does filtration separate mixtures?
Particle Size
300
The law that states that the volume of a gas is directly proportional to its temperature in Kelvins if the pressure and the number of particles is constant is:
Charles law
300
During what phase change does the arrangement of water molecules become more orderly?
freezing
300
At what temperature does water boil on the Celsius scale?
100
400
What is an example of a mixture?
Sand
400
List 3 ways you know a chemical change has taken place
change in color, percipitate formed, gas produced
400
The phase change in which a substance changes from a solid to a gas or vapor without changing into liquid first.
sublimation
400
Rutherford's experiment provided evidence for what?
There is a dense positively charged center
400
Why are peer reviews important? List 3 things
receive criticism, check for accuracy, suggestions
500
Democritus coined what term?
atom
500
List 3 things that affect the pressure of an enclosed gas
temperature, volume, number of particles
500
JJ Thomson's experiment provided evidence for what?
the atom contains negatively charged atoms
500
What subatomic particle has a negative charge?
electrons
500
What does malleable mean and give an example
You can bend it without it shattering. Example: Gold