Question | Answer |
how could snow disappear without making a puddle? | sublimation! |
does a gas gain heat when it condenses? | no - condensation comes with cooling |
what might happen if there were no spaces between sections of a sidewalk? | the sidewalk would break from thermal expansion and contraction |
the temperature at which a substance melts is called its __________ | melting point |
why wouldn't turning up the heat on the stove make boiling water cook things faster? | because liquid water can't get hotter than it is when it's boiling! |
what kind of mixture is dusty air? | it's a suspension |
what might happen if you mixed two suspensions? | you might get four layers! |
how can you tell muddy water isn't a colloid? | because the dirt eventually settles to the bottom |
why might fish not get enough oxygen in hot water? | because hot water can't hold as much dissolved oxygen as cold water |
if two liquids boil at about the same temperature, would it be easy to separate them by distillation? | no, because it would be too easy to boil them both away at the same time! |
a solution of metal is called an ___________ | alloy |
a solution of sugar in water has a solubility limit. Do heterogenous mixtures have solubility limits? | nope- you can just make that mixture more chunky - like Ben & Jerry's Ice Cream! |
How can matter change state? | by gaining or losing energy! |
what happens to the temperature when matter is changing state? | the temperature stays the same |