Space Stuff!
What object is at the center of our solar system?
the Sun
What two gasses make up 99% of the air near Earth's surface.
What are nitrogen and oxygen
What is the defining feature of a solution?
one substance was dissolved in another substance
What is the one and only FOR SURE sign of a chemical change?
A new substance was produced.
True or False: The amount of water on Earth is always decreasing.
False! It stays (pretty much) constant.
Which planet is closest to the sun?
Mercury
What is the lowest layer of the atmosphere called? (It's where all the weather happens.)
the troposphere
If you add so much salt to a glass of water that it all won't dissolve no matter how much you mix it, you could say the solution is ____________.
saturated (NOT supersaturated!)
What are the starting ingredients in a chemical reaction called?
reactants
What is it called when water (liquid or solid) falls from the sky down to Earth's surface?
Precipitation
Which planet is furthest from the sun?
Neptune
As you go up through our atmosphere, what two things happen to the air.
It gets colder and thinner/lighter/less dense
What are the two way to make a solution supersaturated?
Increase the heat or increase the pressure
If I mix 10g of baking soda and 10g of vinegar in a sealed bag, will the mass of the stuff in the bag after the reaction be greater than, less than, or equal to 20g?
equal to 20g
True or False: Clouds are made of water vapor.
False. They are made of tiny droplets of liquid water.
If you are looking down at Earth's north pole from space, in what direction would Earth be rotating, clockwise, or counterclockwise?
Counterclockwise
What is the difference between a weather forecast, and a weather report?
A forecast is a prediction, a report is just reporting current conditions.
What are the two ways to make a solution more concentrated?
Add more solute ("stuff that gets dissolved" is acceptable) or use less solvent (water is also acceptable)
True or False: When you open a can of soda, the release of bubbles means you just caused a chemical reaction.
False
What is it called when water changes from a liquid to a gas?
evaporation
(if you said "boiling" or "vaporization" I guess that also should count)
If stars are soooo much bigger than our moon, then why can't we see stars during the day, but we can sometimes see the moon during the day?
Because the stars are soooo much further away!
What is the weather variable that tells us how much water vaper is in the air?
Humidity
What type of membrane only lets SOME liquids and gasses pass through it?
a semipermeable membrane
What do you call an insoluble substance produced by a chemical reaction?
precipitate
What is it called when water vapor changes back into liquid water?
Condensation