Mixtures Answers

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What is the correct classification of a mixture in which both a solid and a liquid are visible?

A
a homogeneous mixture and a solution
B
a homogeneous mixture and a suspension
C
a heterogeneous mixture and a solution
D
a heterogeneous mixture and a suspension
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A
element
B
pure substance
C
mixture
D
solution
3

Otis watches a cooking show on making mayonnaise. The chef dissolves salt and sugar in vinegar. She mixes in an egg yolk, and then mixes in oil until the ingredients are completely blended together. The chef says that it’s great on sandwiches and that it can be stored without separating.Which best describes the purpose of the egg yolk in the recipe?

A
It allows the oil to change from liquid to a gas in order to form bubbles.
B
It acts to hold the vinegar and oil together in a colloid.
C
It helps the vinegar be able to form a solution with the salt and sugar.
D
It mixes with both the vinegar and oil to form a suspension.
4

Julie takes a cold glass of clear, colorless liquid out of the refrigerator and puts it on the table. As the liquid warms up to room temperature, Julie sees bubbles of gas form in the liquid and rise to the surface.Which conclusion is best supported by Julie’s observations?

A
The liquid is a pure substance because it is colorless.
B
The liquid is a mixture because its temperature rises.
C
The liquid is a pure substance because it remains liquid when cold.
D
The liquid is a mixture because it has a gas dissolved in a liquid.
5

Which is a characteristic of colloids?

A
are homogeneous mixtures
B
have large dispersed particles
C
will settle out over time
D
are made up of at least two substances
7

Which would most likely form a homogeneous mixture?

A
10 marbles mixed with 10 small balls
B
a pinch of sugar mixed with a cup of water
C
a pile of big rocks mixed with a bag of sand
D
1 cup of peas mixed with 1 cup of carrots
8

Which is a property of every heterogeneous mixture?

A
The mixture is made up of at least two different states.
B
The mixture is made up of something dissolved in a liquid.
C
The composition of the mixture is the same throughout.
D
The characteristics of the mixture change within a sample.
10

Which will settle out if allowed to sit on a table?

A
a suspension
B
a colloid
C
a solution
D
a compound

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