AnswersAZ-Science 8 A SharmaChemical Properties

Chemical Properties — Unit test Answers

15 verified answers
1
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Which statement gives two characteristics of all liquids?

A
They spread out to fill space and have atoms that vibrate in place.
B
They have atoms that vibrate in place and have a definite shape.
C
They will change shape to fit a container and have definite volume.
D
They have definite volume and have atoms that move freely in all directions.
2
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T
The atoms in hydrogen peroxide are breaking apart and forming new types of molecules.
T
The atoms in hydrogen peroxide are breaking apart and recombining into the original molecules.
T
The molecules of hydrogen peroxide remain intact as new types of molecules form and move out of the liquid.
T
The molecules of hydrogen peroxide remain intact but move more quickly to allow evaporation.
3

What is conserved in physical changes?

A
shape
B
energy
C
mass
D
density
4

An amount of nitrogen undergoes a physical change and increases its volume. What can be known about this physical change?

A
The boiling point of the nitrogen increased.
B
The mass of nitrogen increased.
C
The color changed.
D
The density changed.
5

Ella makes this table to organize her notes on whether atoms gain or lose energy during the changes of state.

Question illustration
A
freezing, boiling, and melting
B
melting, vaporization, and sublimation
C
sublimation, deposition, and condensation
D
freezing, deposition, and condensation
6

Citing sources can help students avoid accusations of plagiarism because it

A
indicates where they found information.
B
shows that they used credible sources.
C
proves that their sources are relevant.
D
documents their research process.
7

Which example illustrates a chemical change?

s
shredding paper
s
smashing a soda can
b
burning wood
c
chopping wood
8

compare, effect, or causeif, because, or thenwho, what, why, or howwhen or where

A
compare, effect, or cause
B
if, because, or then
C
who, what, why, or how
D
when or where
9

A cylinder at left with balls in a layer on the bottom of the cylinder has an arrow leading to a cylinder at right with balls stacked near the bottom of the cylinder.

Question illustration
A
Atoms gain energy as a solid changes to a gas.
B
Atoms gain energy as a liquid changes to a gas.
C
Atoms lose energy as a solid changes to a gas.
D
Atoms lose energy as a liquid changes to a gas.
10

Which property of physical changes explains why matter is conserved in a physical change?

A
The arrangements of particles do not change, and the bonds between atoms do not break.
B
Mass, not energy, changes in a physical change.
C
Energy and mass change in a physical change.
D
The bonds between atoms do not break; it is only the arrangement that changes.
11

Chanel has some cotton candy that came in a cloudy shape. She wants to make it more dense. Which describes the candy before and after Chanel manipulated it?

A
The candy before was a cube, and the candy after was a ball.
B
The candy before was compacted, and the candy after was fluffy.
C
The candy before was fluffy, and the candy after was compacted.
D
The candy before was a ball, and the candy after was a cube.
12

If a person has the values for an object’s density and volume, what value can be calculated?

A
the object’s size
B
the object’s mass
C
the shape the object forms in a container
D
the amount of space the object takes up
13

Which tools would Sara use to find an irregularly shaped object’s mass and volume?

A
a meter stick, a ruler, and water
B
a meter stick, a balance, and water
C
a balance, water, and a ruler
D
a balance, water, and a beaker
14

Four students are analyzing four different substances and recording their findings in this table.Which most describes this table?

Question illustration
A
Leonna has a solid, Xiao and Blake have liquids, and Amir has a gas.
B
Leonna and Amir have gasses, Xiao has a liquid, and Blake has a solid.
C
Leonna has a solid, Xiao has a liquid, Blake has a gas, and Amir made a mistake.
D
Leonna has a solid, Xiao has a liquid, Blake made a mistake, and Amir has a gas.
15

Marco wants to investigate the chemical properties of sodium bicarbonate, or baking soda. He plans to carry out the tests below.Test 1: Mix a teaspoon of sodium bicarbonate into a cup of warm water to see if it dissolves.Test 2: Mix a teaspoon of sodium bicarbonate into a cup of vinegar to see if it fizzes.Test 3: Heat a teaspoon of sodium bicarbonate in the oven to see if its melting point is less than 400 degrees Fahrenheit.

O
Only Test 3 will indicate a chemical property of sodium bicarbonate. Tests 1 and 2 will show a physical property of the substance.
O
Only tests 1 and 2 will indicate chemical properties of sodium bicarbonate. Test 3 will show a physical property of the substance.
O
Only Test 2 will indicate a chemical property of sodium bicarbonate. Tests 1 and 3 will show a physical property of the substance.
O
Only tests 1 and 3 will indicate chemical properties of sodium bicarbonate. Test 2 will show a physical property of the substance.

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