AnswersNC-Physical Science CR 2024Metallic Bonds

Metallic Bonds — Unit test Answers

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Tijuan mixed a solid and a liquid together in a beaker. He determined that a chemical change occurred.

A
ice mixed into warm oil, because the change of state that occurred when the ice melted cannot be reversed
B
baking soda mixed into vinegar, because the production of bubbles indicates that a new substance formed
C
sugar mixed into hot water, because the disappearance of solid indicates that the chemical identity of the sugar changed
D
sand mixed into water, because when sand was added the mass of the beaker increased
2
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Which type of reaction has the general formula of AB + CD → AD + CB?

A
synthesis
B
decomposition
C
oxidation
D
replacement
3

Which clue can be used to identify a chemical reaction as a decomposition reaction?

A
The reaction involves oxygen.
B
The reaction involves ions.
C
The reaction has a single reactant.
D
The reaction has a single product.
4

The descriptions below explain two ways that water is used by plants on a sunny day.I. In a process called transpiration, some liquid water in leaves changes to water vapor. The water vapor is released into the air through tiny pores in the leaves. This allows more liquid water from the soil to be pulled up the roots and stem to replace water lost from the leaves.II. Plants use some of this water in leaves in a process called photosynthesis. During photosynthesis, water and carbon dioxide break apart and recombine to form two new substances, oxygen and glucose.

A
In transpiration, because some of its properties change, water undergoes a physical change but keeps its identity. In photosynthesis, because its identity changes, water undergoes a chemical change.
B
In transpiration, because some of its properties change, water undergoes a chemical change but keeps its identity. In photosynthesis, because its identity changes, water undergoes a physical change.
C
In transpiration, because its physical properties change, water undergoes a physical change and loses its identity. In photosynthesis, because it keeps its identity, water undergoes a chemical change.
D
In transpiration, because its chemical properties change, water undergoes a chemical change and loses its identity. In photosynthesis, because it keeps its identity, water undergoes a physical change.
5

Which condition must be met in order for an equation to be balanced?

A
The elements in the reactants are the same as the elements in the products.
B
There are fewer elements in the reactants than there are in the products.
C
The number of atoms in the reactants is greater than the number of atoms in the products.
D
The number of atoms in the reactants equals the number of atoms in the products.
6

Which would show an example of how physical changes are reversible?

A
cutting a gold bar in two pieces and then putting the pieces next to each other
B
burning a match and then relighting it
C
melting tin and then cooling it into a mold
D
combining sodium and chlorine to make the new material of table salt
7

Which is most likely a physical change?

A
cutting a substance into four pieces
B
burning a substance into ash and smoke
C
reacting a substance chemically to form a new substance
D
combining a substance with water to make rust
8

A substance occupies one half of an open container. The atoms of the substance are closely packed but are still able to slide past each other.What is most likely the phase of the substance?

A
gas
B
liquid
C
solid and gas
D
liquid and solid
9

Lexi is balancing equations. She is finding one equation to be very difficult to balance. Which explains how to balance the equation ZnSO4 + Li2CO3 → ZnCO3 + Li2SO4?

A
One reactant and one product needs the coefficient 2.
B
The products both need a 3 coefficient.
C
The reactants both need a 2 coefficient.
D
Atoms in the equation are already in balance.
10

During which change of state do atoms lose energy?

A
sublimation
B
freezing
C
boiling
D
melting
11

Three grams of the same substance in different phases are stored in three different containers. Each container is barely large enough to hold the substance.Which statement can be known about the behavior of the atoms in each container?

A
The atoms in the solid would be moving vigorously around the container.
B
The atoms in the liquid would be vibrating in position.
C
The atoms in the solid would be vibrating in position.
D
The atoms in the gas would be moving slowly around the container.
12

The diagram shows changes of state between solid, liquid, and gas. The atoms of a substance gain energy during a change of state. Before the change, the atoms are close together and cannot slide past one another. After the change, the substance can fill its container.

Question illustration
A
L
B
M
C
N
D
O
13

What are the products of the combustion of a hydrocarbon?

A
carbon and oxygen
B
carbon dioxide and water
C
carbon and hydrogen
D
carbon dioxide and hydrogen
14

Which is the process by which a gas changes to a solid?

A
deposition
B
evaporation
C
freezing
D
sublimation
15

Which procedure would best allow a scientist to observe a chemical property of hydrochloric acid (HCl) solution?

A
cooling the HCl solution until it becomes solid, and measuring this temperature
B
adding zinc to the HCl solution and observing whether or not bubbles are produced
C
placing a conductivity probe into a beaker of HCl solution to determine if it conducts electricity
D
measuring the mass of and volume of a sample of HCl solution to find its density
16

Which balances the equation Mg + O2 → MgO?

A
Mg + 2O2 → 4MgO
B
2Mg + 2O2 → 2MgO
C
2Mg + O2 → 2MgO
D
2Mg + 2O2 → 4MgO
17

Which describes a feature of the physical changes of all substances?

A
can dissolve in water
B
can conduct heat and electricity
C
rearranges atoms to form new substances
D
does not change the identity of a substance
18

Hydrochloric acid and sodium hydroxide can be combined to form sodium chloride and water. Which best explains the reaction?

A
The mass of sodium hydroxide will result in the same mass of sodium chloride.
B
The total mass of hydrochloric acid and sodium hydroxide will result in a lower total mass of sodium chloride and water.
C
The mass of hydrochloric acid will result in the same mass of sodium chloride.
D
The total mass of hydrochloric acid and sodium hydroxide will result in the same total mass of sodium chloride and water.
19

The density of solid aluminum is 2.70 g/cm3. If a 1g piece of aluminum is dropped in a cup of water, what will happen to the aluminum? (The density of water is 1.00 g/cm3.)

A
It will sink to the bottom.
B
It will float to the top.
C
It will hover in the middle.
D
It will move up and down.
20

Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation would most likely indicate that a chemical change has occurred in the substance?

A
If the substance is a liquid or solid, an increase in temperature would indicate a chemical change.
B
If the substance is a liquid, a change of some of the liquid to gaseous form would indicate a chemical change.
C
If the substance is a solid, a change of some of the solid to liquid form would indicate a chemical change.
D
If the substance is a liquid or solid, production of an odor would indicate a chemical change.

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