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8th Gr Midterm
Study for your midterm
Question | Answer |
---|---|
What does a graduated cylinder measure? | Liquid volume |
What does a triple beam balance measure? | Mass |
All matter is made of .........? | atoms |
Physical changes are changes in .....? | Size, shape and state |
All phase changes are __________ changes. | Physical |
Name 7 phase changes. | Freezing, melting, boiling, evaporation, condensation, deposition, sublimation. ALL ARE PHYSICAL CHANGES! |
How do we know if a chemical change has taken place? | A NEW SUBSTANCE IS FORMED! |
What are some pieces of evidence that would indicate that a chemical change has taken place? | Creation of a gas, change in smell, formation of a precipitate |
Name the 3 forms of heat transfer. | Conduction, Convection, and Radiation |
Which form of heat transfer works best in solids? | Conduction |
Which form of heat transfer happens in FLUIDS? (liquids and gases) | Convection |
Which form of heat transfer happens because of differences in density? (hot things rise, cold things sink) | Convection |
Which form of heat transfer works only if substances are TOUCHING? | Conduction |
How does most of the energy from the sun reach the earth? | Radiation |
What happens to temperature during a phase change? | It stays the same! |
What does the phase change graph look like during a phase change? | It shows a plateau. (A straight horizontal line) |
Which phase of matter has the slowest moving and most densely packed particles? | SOLIDS |
Which state of matter has the fastest moving and most widely spaced particles? | GASES (and plasma) |
How do we calculate the net force if we have 2 forces acting in opposite directions? | Subtract them |
How do we calculate the net force if we have 2 forces acting in the same direction? | Add them |
Name Newton's First Law. | Inertia. (Objects in motion will stay in motion and objects at rest will stay at rest unless acted on by an outside force.) |
What is Newton's Second Law? | Force = mass x acceleration |
What is Newton's Third Law? | Every action has an equal and opposite reaction. |
What is friction? | Friction is the force opposing motion between 2 surfaces that are touching. |
Will adding sandpaper to a surface increase or decrease the friction provided by the surface? | Increase! |
Where will an object have the most kinetic energy? | Wherever it is moving the FASTEST! |
What is the best way to separate iron filings and sand? | With a magnet! |
What is meant by the term nonrenewable energy source? | It means that when it is gone....it is gone. Example: Fossil fuels ( coal , oil, and natural gas) |
Name some renewable energy sources. | Wind, solar, geothermal, hydroelectric |
Name an advantage and a disadvantage to using wind energy. | Advantage- Renewable and nonpolluting Disadvantage- Noisy, interferes with radio and TV signals |
Name an advantage and a disadvantage to using solar energy. | Advantage-Renewable and nonpolluting Disadvantage- high start up cost, not always sunny |
What is the ORIGINAL source of all energy on earth regardless of what kind we are referring to? | THE SUN!!! THE SUN!!! THE SUN!!! |
What is a solution? | When you have one substance dissolved into another |
What are 3 ways to make the solute dissolve faster in the solvent? | Heat the solvent, Crush the solute, or stir |
How can we remove salt from a salt water solution? | Boil the water until it is all changed to water vapor. The salt will remain |
Substances of various densities are placed in a beaker. Can we predict which will be on the bottom? On the top? | The most dense substance will be on the bottom and the least dense will be on the top. |
When we STATE THE RELATIONSHIP between two things, do we include numbers in our answer? | NO WE DO NOT! |
State the relationship between the amount of time practicing math and your grade in math. | As the number of hours that I practice math INCREASES, my math grade INCREASES also. See......no numbers! |