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39 terms

Science chapter 15 study guide

STUDY
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substances are either elements or mixtures
false - compounds
the color of a substance is a physical property
True
smoke is a compound
false colloid
distillation is a way to separate a mixture using the physical property of boiling point
true
the law of conservation of mass states that the mass of all substances before a physical change equals the mass of all the substances after the change
false - chemical
colloids are mixtures
true
the freezing of water is a chemical change
false - physical
homogeneous mixtures include colloids, solutions and suspensions
false, only solutions
when lightning converts oxygen gas, O2, into ozone, O3, it s a physical change
false chemical
a fruit salad is a homogeneous mixture
false, heterogeneous
flammability is a physical property
false, chemical
when a firecracker explodes, mass is lost
F conserved
if a mixture scatters light and does not settle upon standing, it is a suspension
F colloid
a suspension is a homogeneous mixture
false heterogeneous
the breaking of a glass windwo is a physical change
true
using oxyten to separate molten copper sulfide into copper and sulfur dioxide is a phusical change
false - chemical
three examples of physical change are
boiling of water, bursting of a balloon, and crumpling a piece of paper
the shape of an appi is a
physical property
fog is an example of a colloid
colloid
when a log burns in a fire
new substances are formed
what is another name for a homogeneous mixture
solution
when two or more substances are combined so each substance can be separated by physical means, the result is
a mixture
collloid, compound, suspension, solution is NOT a mixture
compound
the scattering of light by colloids is called
the tyndall effect
permanentppress fabric, glue, vinegar, gelatin is NOT a homogeneous mixture
permanent press fabric
you are given a flask that contains 250 ml of a clear brown liquid. you shine a light through the liquid, and no light beam is visible. in the following list of items, record a y if that item could be a valid definition for the liquid. record a N if that item could not be a valid definition

a substance
b colloid
c solution of a solid in a liquid
d suspension
solution of a liquid in a liquid
a yes
b no
c yes
d no
e yes
composition
mixture
has mass, takes up space
matter
two or more elements combined
compound
all atoms the same
element
composition definite
substance
matter is classified as _____________and mixtures
substances
a colloid is a __________mixture
heterogeneous
river deltas, which form as silt and mud settle, are evidence that river water is a
suspension
a particle scatters light if it is larger than the ________of light
wavelength
when acid rain falls on limestone, ________weathering occurs
chemical
the resistance of diamond (a form of carbon) to corrosion is a ___________property
chemical
when sugar and salt are mixed together, the properties of the final substances are ___________those of the beginning substances
the same as
the law that states mass is neither gained nor lost in a chemical change is
the law of conservation of mass