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.
The part of a solution that is dissolved is called the?
SOLUTE
the part of a solution that is doing the dissolving is called the?
SOLVENT
what is an alloy?
Solution of metals
what is a solution?
Mixture like a suspension, except its parts do not settle to the bottom.
what is an example of a colloid? Muddy water, cake mix, mayonnaise, OJ
MAYONNAISE
what is the purpose of distillation
PURIFY WATER
Steel is an example of what?
ALLOY
What is a compound?
substance composed of two or more elements
what is chemical change?
when atoms link together in new ways to create a new substance.
what is a reactant?
a substance that takes part in and undergoes change during a reaction.
what is a product?
end result of a reaction
what is a precipitate?
2 liquids come together - example food coloring in water.
which of the following is not an example of chemical change; tarnished spoon, bubbles in soda, respiration, forming a precipitate
respiration
How is a compound different from a mixture?
Cannot be separated by physical change
List the signs that a chemical change may have occurred?
smell, changes color, admits heat energy and light, tarnishes or rusts, fizzes or bubbles.
a painting exposed to the air could have which effects?
when paint is exposed to air, it becomes oxidized and the paint could fade.
Examples of acids
tastes sours, smells pungent, burns if you touch or stings skin, turns blue litmus paper red
examples of bases
tastes bitter, feels soapy or slippery, dissolves fats and oils , turns red litmus paper blue
