Science Chapter 10 Flashcards
What is a physical change?
alters or changes the way it looks. EXAMPLE when a liquid turns into gas
What is sublimation?
the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase. An example is Dry ice turning into Carbon Dioxide
what is a melting point?
temperature at which substance will melt. An example would be temperature at which butter will melt in a microwave.
What is a boiling point?
temperature at which substance will boil. An example would be temperature at which water boils before you put the pasta in.
What is a freezing point?
Temperature at which a substance will freeze. An example would be temperature at which water freezes to ice.
What is thermal expansion?
the tendency of matter to change its shape, area, and volume in response to a change in temperature. an example would be heating a marshmallow in the microwave
What is thermal contraction?
he “shrinking” of substances as they cool. an example would be when water turns to ice.
Which of the following is not an example of physical change: Melting snow, boiling water, chopping an onion, frying an egg?
Frying an egg
True of False - the chang win an object’s volume that occurs when heat is added is called THERMAL CONTRACTION.
FALSE - The correct answer is THERMAL EXPANSION
what is the change of state from solid to gas?
SUBLIMATION
why is it important to make sure water pipes don’t freeze on cold nights?
water molecules can expand when they freeze which can cause the pipes to break
What is distillation?
process of separating liquids by using evaporation and condensation
the maximum amount of a solute that can dissolve in a solvent is called
SOLUBILITY
what is a colloid?
a mixture that looks the same everywhere, even under a microscope.
what is a mixture?
a physical combination of substances.
