AnswersAZ-Physical Science A-CRChemical Properties

Chemical Properties — Unit test Answers

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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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The atoms in a sample are close together but can slide past one another. As the atoms lose energy, they move slower. The atoms become locked in place because of attractive forces between them.

A
gas to solid
B
gas to liquid
C
liquid to solid
D
solid to liquid
3

Which have different numbers of electrons?

A
different ions of an element
B
different isotopes of an element
C
the nucleus of an element
D
each of the atoms of an element
4

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.
5

Particle A has very little mass in comparison to Particle B. Both particles are in the same atom. Which is the best conclusion about Particles A and B?

A
They have the same charge.
B
They are located in the nucleus together.
C
Particle A has a positive charge, and Particle B is neutral.
D
Particle A orbits the nucleus, and Particle B is located in the nucleus.
6

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.
7

The model below shows an atom of an element.

Question illustration
A
6
B
8
C
9
D
16
8

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.
9

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
10

Rutherford used positively charged particles to investigate the structure of the atom. The results surprised him, and he developed the atomic model shown below.

Question illustration
A
A few positive particles bounced back because they bounced off of the net formed by the ovals.
B
A few positive particles bounced back because they were pushed away from the positive center.
C
Most positive particles passed through because of the empty space between the outer edge and the center.
D
Most positive particles passed through because they were attracted by the small particles moving around the center.
11

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.

A
Only Test 3 will indicate a chemical property of sodium bicarbonate. Tests 1 and 2 will show a physical property of the substance.
B
Only tests 1 and 2 will indicate chemical properties of sodium bicarbonate. Test 3 will show a physical property of the substance.
C
Only Test 2 will indicate a chemical property of sodium bicarbonate. Tests 1 and 3 will show a physical property of the substance.
D
Only tests 1 and 3 will indicate chemical properties of sodium bicarbonate. Test 2 will show a physical property of the substance.
12

An atomic physicist determines that an atom is composed of 8 positively charged particles and has a mass of 15 amu. Which is the best conclusion that can be drawn?

A
The atom has 7 neutrons and 8 protons.
B
The atom has 7 electrons and 8 protons.
C
The atom has 8 neutrons and 7 electrons.
D
The atom has 8 electrons and 7 protons.
13

When hydrogen peroxide bubbles, it is undergoing a chemical change. Which statement best describes what is happening?

A
The atoms in hydrogen peroxide are breaking apart and forming new types of molecules.
B
The atoms in hydrogen peroxide are breaking apart and recombining into the original molecules.
C
The molecules of hydrogen peroxide remain intact as new types of molecules form and move out of the liquid.
D
The molecules of hydrogen peroxide remain intact but move more quickly to allow evaporation.
14

During which changes of state do atoms that cannot move past one another become free to move?

A
vaporization and sublimation
B
boiling and deposition
C
sublimation and melting
D
condensation and melting
15

Which ranks these materials by the attraction between their atoms from the weakest to the strongest?

A
oxygen gas, liquid water, liquid honey, solid iron ore
B
liquid water, liquid honey, oxygen gas, solid iron ore
C
solid iron ore, liquid honey, liquid water, oxygen gas
D
oxygen gas, liquid honey, liquid water, solid iron ore

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