Science chapter 15 study guide

39 terms by barbinga

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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

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