Unit 2
Give an example of a chemical change.
Burning, smoke, bubbles, fizzing, baking
The center of the atom is called . . .
Nucleus
Give an example of a compound
H2O
CO
CO2
Determine the net force AND direction this scenario will travel.
15 <- -> 12
3N to the left
How does heat transfer?
Hot to Cold or Cold to Hot
Hot to Cold
Draw the molecules for a solid, liquid and gas.
Solid - tight together
Liquid - spaced out
Gas - lots of room
The nucleus is made up of what 2 parts?
Protons and neutrons
What is best used to separate sand and salt?
Filter
How does friction affect a moving object?
Slows it down, rubs against it
Solar, Wind, Water, Biomass, Geothermal
Liquid to solid is what phase change?
Freezing
How many atoms of bromine are in MgBr2?
2 Bromines
What separation method can we use to separate iron and black pepper?
Magnet
Place these densities in order from top to bottom.
A - 0.6, B - 1.2, C - 0.9, D - 2.4
A, C, B, D
Describe the changes in kinetic and potential energy as you go down a hill on your bike.
Kinetic increases
Liquid to Gas is what phase change?
Evaporation
How many total atoms are in H2SO4?
7 total
Provide the pH scale values for acid, base and neutral
Acid 1-6
Neutral 7
Base 8-14
A cart pulls a 500 gram load. If we reduce the load to 250 grams and used the same force, what would happen to the speed of the cart?
Sound waves are not able to travel through?
A vacuum
Gas to a liquid is what phase change?
Condensation
In a chemical reaction, compared to the mass of the reactants, the mass of the products should be . . .
Equal
Give 2 ways to speed up the rate of dissolving a solution
Stirring
Smaller pieces
What 2 factors affect gravity?
Mass and distance
What do we call the bending of light rays as it passes through a medium?
Refraction