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Worksheets

8p1.4

Total questions: 125

Worksheet time: 1hrs 24mins

Name
Class
Date
1.

Which is the best example of a pure substance?

a)

peanuts

b)

milk

c)

gold

d)

air

2.

Which statement best explains how periods on the periodic table are organized?

a)

increasing atomic number from left to right

b)

increasing number of neutrons from left to right

c)

decreasing number of electrons from left to right

d)

decreasing atomic mass number from left to right

3.

An ice cube is put into a heated pan. What will most likely happen to the molecules in the ice as the ice is heated?

a)

The molecules will begin to move slower.

b)

The molecules will begin to move faster.

c)

The molecules will begin to increase in density.

d)

The molecules will begin to condense in the air.

4.

Which best explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?

a)

A physical change occurred.

b)

Atoms involved in the reaction lost mass.

c)

Precipitates were created in the new solution.

d)

Gases were released to the atmosphere.

5.

What happens to water molecules during the boiling process?

a)

They move faster and move farther apart as they absorb heat.

b)

They move faster and remain close together as they absorb heat.

c)

They move more slowly but move farther apart as they lose heat.

d)

They move faster and move farther apart as they lose heat.

6.

Which pair of elements has the most similar properties?

a)

Li and B

b)

I and Ca

c)

K and He

d)

N and P

7.

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?

a)

12 atoms of carbon (C)

b)

6 atoms of carbon (C)

c)

3 atoms of carbon (C)

d)

2 atoms of carbon (C)

8.

Which element would Element X most likely be grouped with on the periodic table?

a)

calcium

b)

chlorine

c)

copper

d)

potassium

9.

Which shows one example of a physical change and one example of a chemical change?

a)

boiling water and melting wax

b)

rusting iron and baking a cake

c)

dissolving powder and shredding paper

d)

freezing water and burning coal

10.

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

a)

During a chemical reaction, the total amount of matter stays the same.

b)

During a chemical reaction, matter is destroyed.

c)

During a chemical reaction, one or more new substances are formed.

d)

During a chemical reaction, the total number of atoms increases.

11.

If a substance is composed of atoms arranged in one particular way, how is this substance best classified?

a)

element

b)

compound

c)

mixture

d)

gas

12.

In the current model of the Periodic Table of Elements, the elements have been placed in groups or families. Why have the elements been organized in such a way?

a)

Elements in each group have similar densities.

b)

Elements in each group all have similar boiling points.

c)

Elements in each group have similar physical and chemical properties

d)

Elements in each group have the ability to chemically react with the other elements within that group

13.

A science teacher mixes calcium chloride and vinegar in a test tube. He passes the test tube around for his students to feel. The students notice that the test tube is hot. The science teacher asks the students to decide if the mixing of the two chemicals involved a physical or chemical change. He also asks the students to justify their answer. Which student gave the correct response?

a)

Student 1: The change was physical because a temperature change occurred.

b)

Student 2: The change was chemical because a temperature change occurred.

c)

Student 3: The change was physical because the two chemicals mixed

d)

Student 4: The change was chemical because the two chemicals mixed

14.

Sodium and chlorine can react chemically to form table salt. How does the mass of the table salt formed in this reaction compare to the mass of the sodium and chlorine before the reaction takes place?

a)

The mass of the table salt formed is less than the sodium and chlorine.

b)

The mass of the table salt formed is greater that the sodium and chlorine.

c)

The mass of the table salt formed is twice the mass of the sodium and chlorine.

d)

The mass of the table salt formed is the same as the mass of the sodium and chlorine.

15.

2Mg + O2 → 2MgO


The right side is called....

a)

Reactants

b)

Products

c)

Yields

16.

2Mg + O2 → 2MgO


The left side is called....

a)

Reactants

b)

Products

c)

Yields

17.

2Mg + O2 → 2MgO


The arrow means....

a)

Reactants

b)

Products

c)

Yields

18.

The amount of matter does not change during a chemical reaction, only that the atoms are rearranged to form new substances.

a)

True

b)

False

19.

Law of Conservation of Mass states...

a)

Matter cannot be created or destroyed.

b)

Atoms are rearranged to create new substances.

c)

Both

d)

Neither

20.

The mass of the reactants will equal the mass of the products in a “__________ system.”

a)

closed

b)

open

21.

In an “______ system”, gas and heat can escape causing a change in mass during a reaction.

a)

closed

b)

open

22.

How many atoms:


2H3

a)

2

b)

3

c)

5

d)

6

23.

How many atoms:


Na2

a)

2

b)

3

c)

5

d)

6

24.

How many atoms:


4CO2

a)

4

b)

6

c)

12

d)

10

25.
Which of the following is a chemical reaction?
a)
Sodium and chlorine atoms bond to form salt molecules
b)
Ice melts to form water
c)
Carbon dioxide freezes to form dry ice
d)
Salt and water mix to form salt water
26.

In the equation 2H2 + O2 -> 2H2O, what are the reactants?

a)

Hydrogen and oxygen molecules

b)

Hydrogen atoms

c)

Water molecules

d)

Ice crystals

27.

Sulfuric acid is made of two hydrogen atoms (H), one sulfur atom (S), and four oxygen atoms (O). What is its molecular formula?

a)

H2SO4

b)

H2S2O4

c)

2H4SO

d)

H4S2O

28.
What is the best synonym for the word "stoichiometry?"
a)
Balancing chemical equations
b)
Combining atoms
c)
Discovering new chemical formulas
d)
Breaking the chemical bonds that hold molecules together
29.
The chemical symbol "Ni" represents:
a)
Nickel
b)
Carbon
c)
Antimony
d)
Lead
30.
How do the products of chemical reactions compare to their reactants?
a)
The products often have completely different properties than the reactants.
b)
The products usually weigh more than the reactants.
c)
The products usually have more atoms than the reactants.
d)
The products are usually more toxic than the reactants.
31.

What's the problem with the chemical equation H2 + O2 -> H2O?

a)

There's a missing oxygen in the product.

b)

There's a missing hydrogen in the reactants.

c)

There's an additional oxygen in the product.

d)

There's an additional hydrogen in the reactants.

32.
What's the easiest way to balance a chemical equation?
a)
Trial and error
b)
Using the periodic table
c)
Complex algebra
d)
Calculus
33.

Which reactant is missing from the equation ? + PO4 -> H3PO4?

a)

Three hydrogen atoms

b)

One hydrogen atom

c)

One phosphorus atom

d)

One oxygen atom

34.

What is the product of the equation 2Na + S2O3 -> ____________?

a)

Na2S2O3

b)

NaS2O3

c)

NaS4O3

d)

Na2S2O5

35.
Measure of the amount of matter 
a)
mass
b)
volume
c)
weight
d)
density
36.
Anything that has mass & takes up space
a)
gravity
b)
force
c)
matter
d)
volume
37.
Smallest unit of an element
a)
compound
b)
atom
c)
molecule
d)
product
38.
Smallest unit of a compound
a)
atom
b)
density
c)
element
d)
molecule
39.
Substance that cannot be broken into simpler substances
a)
element
b)
molecule
c)
gram
d)
proton
40.
Substance made up of chemically combined elements
a)
atom
b)
element
c)
electron
d)
compound
41.
Number placed in front of a chemical formula
a)
product
b)
coefficient
c)
reactant
d)
subscript
42.
Number written below & to the right of a chemical symbol
a)
subscript
b)
reactant
c)
product
d)
coefficient
43.
Highly reactive metals in first column of periodic table
a)
halogens
b)
noble gases
c)
alkali metals
d)
metalloids
44.
Highly reactive non-metals in second to last column on periodic table
a)
noble gases
b)
metalloids
c)
alkali metals
d)
halogens
45.
Unreactive gases in last column of periodic table
a)
halogens
b)
alkali metals
c)
noble gases
d)
metalloids
46.
Substances that form as the result of a chemical reaction
a)
products
b)
reactants
c)
coefficients
d)
subscripts
47.
Substances present at the start of a chemical reaction
a)
subscripts
b)
coefficients
c)
reactants
d)
products
48.
Electrons in the outermost orbit or shell
a)
quarks
b)
molecules
c)
valence
d)
compounds
49.
How many iron atoms are in 
Fe(NO3)2
a)
1
b)
2
c)
3
d)
6
50.
How many nitrogen atoms are in 
Fe(NO3)2
a)
1
b)
2
c)
3
d)
6
51.
How many oxygen atoms are in 
Fe(NO3)2
a)
1
b)
2
c)
3
d)
6
52.

Which best represents a balanced equation?

a)
b)
c)
d)
53.

Which is best represented by the equation?

a)

Law of Conservation of Mass

b)

Law of Conservation of Energy

c)

Law of Conservation of Sublimation

d)

Law of Superposition

54.

Which set of coefficients will balance this chemical equation?

a)

1, 3

b)

1, 2

c)

2, 3

d)

2, 5

55.

Which set of coefficients will balance this chemical equation?

a)

2, 3

b)

1, 2

c)

1, 3

d)

2, 2

56.

What coefficient for O2 demonstrates the law of conservation of mass?

a)

2

b)

1

c)

3

d)

4

57.

Which of the following is a correctly written chemical equation that demonstrates the conservation of mass?

a)
b)
c)
d)
58.

The chemical equation shows reactants and products. Which statement is BEST supported by analyzing the equation 6C02 + 12H2O + light + enzymes -> C6H1206 + 602 + 6H20

a)

The atoms rearrange in the chemical reaction so that C6H1206 glucose, is made.

b)

C02 is made from the chemical reaction.

c)

02, oxygen gas, is needed to make the reaction start.

d)

No new compounds are made from this reaction.

59.

Which best describes how to balance this chemical equation shown to support the law of conservation of mass?

a)

Add the coefficient 2 before the Mg on both sides of the equation.

b)

Add the coefficient 2 before the O2 on the left side of the equation.

c)

Add the coefficient 2 before the Mg on the left side of the equation.

d)

Add the coefficient 2 before the MgO on the right side of the equation.

60.

In this equation, suppose 11 grams of zinc react with 12 grams of hydrogen chloride to form 16 grams of zinc chloride and an unknown amount of hydrogen gas. Based on the Law of Conservation of Mass, how many grams of hydrogen gas will form?

a)

7 grams

b)

1 gram

c)

19 grams

d)

24 grams

61.

The reaction shown takes place in a closed system. Which best describes this balanced equation?

a)

Reactants and products are equal in the chemical reaction.

b)

More products and less reactants are produced.

c)

More reactants and less products are produced.

d)

No chemical change occured.

62.

The conversion of 7.0 grams of carbon monoxide and 7.5 grams of nitrogen monoxide using 3.0 grams of platinum catalyst is shown. Which best represents the total mass of carbon dioxide and nitrogen gases produced in this process?

a)

14.5 grams

b)

3.5 grams

c)

10.5 grams

d)

19.5 grams

63.

Which products would balance this equation?

a)
b)
c)
d)
64.

Which substance would make the equation true and balanced?

a)
b)
c)
d)
65.

A chemical reaction is shown by the equation shown. Based on the law of conservation of mass, how much hydrogen gas is produced compared to the amount of oxygen produced?

a)

twice as much

b)

half as much

c)

the same amount

d)

four times as much

66.

What is the total number of oxygen atoms on the reactant side of the equation shown?

a)

5

b)

3

c)

2

d)

7

67.

How many atoms of hydrogen are involved in this reaction?

a)

4

b)

1

c)

2

d)

8

68.

Examine the lab procedures that Sam followed in completing an experiment to determine which answer best describes Sam’s conclusion.

a)

No change in mass occurred after heating.

b)

A change in mass occurred after heating.

c)

A physical change occurred, producing new products.

d)

A chemical change occurred, producing new reactants.

69.

How many methane (CH4) molecules would be needed to produce 13 carbon dioxide (CO2) molecules?

a)

13

b)

4

c)

26

d)

52

70.

If this chemical reaction starts with 10 times the amount of oxygen and hydrogen atoms shown, which best describes the amount of product?

a)

There would be 10 times more water molecules produced.

b)

There would be 1 less water molecule produced.

c)

There would be 20 times more water molecules produced.

d)

There would be the same amount of water molecules produced.

71.

Which best explains how this chemical reaction follows the law of conservation of mass?

a)

The same number of hydrogen and oxygen atoms are on both sides of the equation.

b)

The hydrogen and oxygen molecules combine to form water.

c)

Hydrogen and oxygen are held together by strong chemical bonds.

d)

There are hydrogen and oxygen atoms on both sides of the equation.

72.

Which is the correct way to balance this chemical equation?

a)
b)
c)
d)
73.

Use the notes that Max recorded to explain how the law of conservation of mass was demonstrated in the experiment?

a)

The mass of the resulting solution was equal to the mass of the solute and liquid.

b)

The solute completely dissolved in the liquid.

c)

The liquid was chemically changed by the addition of the solute.

d)

Some of the mass of the solute was lost during the experiment.

74.
Sodium sulfate and barium chloride react with each other to form sodium chloride. Which statement MOST accurately describes the mass of the reactants compared to the mass of the products?
a)
The mass of the reactants is the same as the mass of the products.
b)
The products have a greater mass because matter was created during the reaction.
c)
The reactants have a greater mass because some of the mass was converted to heat.
d)
The reactants have a greater mass because some matter was destroyed by the reaction.
75.
How does the concept of conservation of mass apply to chemical reactions?
a)
The reactants and products have exactly the same atoms.
b)
The reactants and products have exactly the same molecules.
c)
The change in the amount of matter is equal to the change in energy.
d)
The change in the amount of matter is only a small percentage of the total mass.
76.
A chemical reaction separates water into hydrogen gas and oxygen gas. Which of the following statements is true about the mass of the water and the combined mass of the two gases?
a)
The combined mass of the two gases is the same as the mass of the water.
b)
The mass of the water is greater than the combined mass of the two gases.
c)
The combined mass of the two gases is much greater than the mass of the water.
d)
The mass of the water is the same as double the combined mass of the two gases.
77.
If 100 grams of vinegar and 5 grams of baking soda are poured in a container, a small amount of gas will be produced. What will the final mass of the products be if the gas is trapped in the container?
a)
105 grams
b)
100 grams
c)
104 grams
d)
110 grams
78.
When a mixture of oxygen and hydrogen is ignited in a test tube, the reaction {Hydrogen + Oxygen → Water + Energy} occurs. What happens to the total mass of the contents of the test tube?
a)
The total mass remains the same.
b)
The total mass increases.
c)
The total mass decreases.
d)
Part of the mass is changed to heat energy.
79.
How does a balanced chemical equation satisfy the Law of Conservation of Mass?
a)
During a chemical reaction, the total amount of matter stays the same.
b)
During a chemical reaction, matter is destroyed.
c)
During a chemical reaction, one or more new substances are formed.
d)
During a chemical reaction, the total number of atoms increases.
80.
If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?
a)
6 atoms of carbon (C)
b)
12 atoms of carbon (C)
c)
3 atoms of carbon (C)
d)
2 atoms of carbon (C)
81.
Which best explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?
a)
Gases were released to the atmosphere.
b)
A physical change occurred.
c)
Atoms involved in the reaction lost mass.
d)
Precipitates were created in the new solution.
82.
Which best represents a balanced equation?
a)
120 grams of carbon plus 80 grams of oxygen → 200 grams of carbon dioxide
b)
120 grams of carbon plus 20 grams of oxygen → 200 grams of carbon dioxide
c)
120 grams of carbon plus 50 grams of oxygen → 200 grams of carbon dioxide
d)
120 grams of carbon plus 60 grams of oxygen → 200 grams of carbon dioxide
83.
When chemicals react in a closed container, which must be true?
a)
The mass both before and after the reaction is the same.
b)
The mass both before and after the reaction is variable.
c)
The same number of compounds is present both before and after the reaction.
d)
Water is always a byproduct of reactions in closed containers.
84.
Substance A has a mass of 7 grams. When substance A was mixed with substance B, a new substance was formed. Which statement best describes the Law of Conservation of Mass?
a)
The mass of the product is equal to the mass of the reactants.
b)
The mass of substance B is equal to the mass of the product.
c)
The mass of the product is less than the mass of the reactants.
d)
The mass of the reactants is greater than the mass of the product.
85.
The compound ammonia is composed of nitrogen and hydrogen atoms. If two atoms of nitrogen completely react with six atoms of hydrogen to form two molecules of ammonia, which best describes the number of hydrogen atoms present in the two molecules of ammonia?
a)
six hydrogen atoms
b)
two hydrogen atoms
c)
four hydrogen atoms
d)
eight hydrogen atoms
86.

An engineer pours hot, liquid metal into a mold. As it cools, it takes the form of a solid beam. In this process, what is the evidence that a physical change occurred?

a)

I and II only

b)

II only

c)

III only

d)

I, II, and III

87.

Vinegar is a dilute solution of acetic acid (CH3COOH). It has a density of 1.01 g/mL and freezes at approximately 2°C (36°F). It has a sour taste and is often used to make pickles. It can also be combined with baking soda to produce carbon dioxide gas. Which of the following describes a chemical property of vinegar?

a)

Vinegar can react with baking soda.

b)

Vinegar freezes at 2°C.

c)

Vinegar has a density of 1.01 g/mL.

d)

Vinegar has a sour taste.

88.
When a substance undergoes a physical change,
a)
its composition remains the same.
b)
its mass always decreases.
c)
its color always changes.
d)
its composition always changes.
89.
Which of the following is a physical change?
a)
the sublimation of dry ice
b)
an iron bar rusting
c)
oil floating on water
d)
a copper skillet tarnishing
90.
Gerald's science teacher mixed liquid X and liquid Y, both at room-temperature, in a large beaker. The mixture in the large beaker still looked clear like water, but when the students, one at a time, carefully touched the outside of the large beaker, it felt warm to the touch. Why did the large beaker most likely feel warm?
a)
A chemical reaction produced a new substance.
b)
The two liquids were not soluble in water.
c)
The release of a gas heated the solution.
d)
The energy of mixing warmed the liquids.
91.
When a small piece of white marble rock is carefully placed in a beaker of hydrochloric acid, bubbles form on the surface of the rock and rise to the top of the liquid. Which conclusion best fits this observation?
a)
The rock reacted with the acid and made a new gaseous substance.
b)
The rock was changed by the acid into its gaseous form.
c)
The rock heated the acid until it began to boil.
d)
The rock dissolved in the acid by breaking into its smallest pieces.
92.
Jeannie dropped a solid object into a beaker of water and observed it for five minutes. Based on her observations, she determined that only a physical change occurred. Which of the following observations would indicate that only a physical change occurred after she added the object?
a)
The object broke apart and seemed to disappear when dropped into the glass of water.
b)
Bubbles formed around the object as it sank to the bottom of the water and did not resurface.
c)
The object floated on the top of the water when when dropped into the glass.
d)
The object sank to the bottom when dropped into the glass of water.
93.
Baking soda and vinegar can be used to model a volcanic eruption in a science demonstration because they bubble violently when mixed. What can be concluded about mixing vinegar and baking soda?
a)
Vinegar and baking soda react to form a new gaseous substance.
b)
Vinegar boils when it comes in contact with baking soda.
c)
Baking soda and vinegar make a uniform mixture.
d)
Baking soda has a lower density than vinegar.
94.
A cube of sodium chloride—which is table salt—is soluble in water. A _______ property of salt is that it will _______ in water.
a)
physical; dissolve
b)
chemical; sink
c)
physical; corrode
d)
chemical; dissolve
95.
What do the chemical reactions that occur during burning and rusting have in common?
a)
They are both reactions of a substance with oxygen.
b)
They are both reactions that produce oxygen.
c)
They are both reactions of a substance with water.
d)
They are both reactions that happen very quickly.
96.

When iron reacts with oxygen, it forms iron oxide, or rust. If 112 g of iron (Fe) combines with 24 g of oxygen (O2), how much iron oxide is formed?

a)

136 g Fe2O3

b)

88 g Fe2O3

c)

112 g Fe2O3

d)

24 g Fe2O3

97.

In atomic theory, new substances are formed when the atoms of other substances are rearranged. In this kind of change, the total number of atoms is conserved. An example of this is shown in the diagram. There are six atoms both before and after the arrow. Which statement below is also true of the rearrangement of atoms?

a)

The amount of matter is conserved.

b)

The number of substances is conserved.

c)

The amount of matter decreases.

d)

The number of substances increases.

98.

The balanced equation for the production of sugars by photosynthesis is shown in the image. This equation demonstrates the law of conservation of mass because

a)

there is the same number of each type of atom on the right side of the equation as the left.

b)

there are more oxygen atoms on the right side of the equation than on the left.

c)

there is the same number of compounds on the right side of the equation as the left.

d)

the sugar molecule on the right has the same mass as the carbon dioxide molecules on the left.

99.

The chemical reaction shown in this image takes place in a closed system. What is true about the system while the reaction occurs?

a)

The total mass of the particles in the system stays the same.

b)

The total number of particles in the system increases.

c)

The total mass of the particles in the system increases.

d)

The total number of particles in the system decreases.

100.
Berny has a 0.15-kilogram candle, a 1.00-kilogram jar, and a 0.25 kilogram candle holder. He places the candle and candle holder in the jar, lights the candle, and then immediately closes the jar. What should the total mass of the jar and its contents be after the candle goes out?
a)
1.40 kilograms
b)
1.15 kilograms
c)
1.00 kilograms
d)
1.25 kilograms
101.

Look at the equation O2 + CS2 → CO2 + SO2 Which of the following shows the equation balanced?

a)

3 O2 + CS2 → CO2 + 2 SO2

b)

O2 + CS2 → CO2 + SO2

c)

4 O2 + 4 CS2 → 4 CO2 + 4 SO2

d)

3 O2 + CS2 → 2 CO2 + SO2

102.
In a chemical reaction, atoms are rearranged to form new molecules. However, atoms are neither created nor destroyed. What happens to the total mass of the atoms involved in a chemical reaction?
a)
It will stay the same no matter how the atoms are rearranged.
b)
It always changes as the atoms are rearranged into new molecules.
c)
It will decrease if two molecules combine to form a single compound.
d)
It will increase if a new compound is formed during the reaction.
103.
When limestone (calcium carbonate) is strongly heated, it breaks down into calcium oxide and carbon dioxide. If 88 grams of carbon dioxide is released when 200 grams of limestone is heated, how much calcium oxide is produced in this reaction?
a)
112 grams
b)
56 grams
c)
200 grams
d)
88 grams
104.
Which of the following errors might explain why an experiment's results would indicate that mass was not conserved?
a)
Failure to collect the gas and dust released by the burning charcoal.
b)
Mass is not conserved when an object undergoes a chemical change.
c)
Forgetting to measure the mass of the charcoal while it was still burning.
d)
Burning the charcoal for a longer period of time than another scientists.
105.
Twenty-four grams of magnesium metal reacts with sixteen grams of oxygen gas to form magnesium oxide. According to the law of conservation of mass, how much magnesium oxide will there be after the chemical change is complete?
a)
40 g
b)
16 g
c)
24 g
d)
30 g
106.

In the chemical reaction below, sodium metal and chlorine gas combine to form sodium chloride. sodium metal + chlorine gas → sodium chloride (table salt) If the combined mass of the reactants is 50 grams, then the mass of sodium chloride formed once the reaction has reached completion

a)

will be exactly 50 grams.

b)

will be exactly 100 grams.

c)

will be between 50 and 100 grams.

d)

will be less than 50 grams.

107.

When electricity flows through water, the water molecules split into molecules of hydrogen and oxygen gas. How many oxygen (O2) molecules are produced from the splitting of two molecules of water (H2O) if the balanced equation for the reaction is 2H2O → 2H2 + O2

a)

1

b)

2

c)

4

d)

3

108.
When solid magnesium burns, it reacts with oxygen in the air to form a powder called magnesium oxide. A chemist performed this reaction in a lab and found that the mass of the magnesium oxide was greater than the mass of the magnesium. What is the reason behind this increase in mass?
a)
The increase in the mass of the magnesium oxide was due to oxygen atoms in the air.
b)
The increase in the mass of the magnesium oxide happened because oxygen is heavier than magnesium.
c)
The increase in the mass of the magnesium oxide was due to magnesium atoms in the air.
d)
The increase in the mass of the magnesium oxide happened because magnesium is heavier than oxygen.
109.

The chemical equation 2Li + S → Li2S represents the chemical reaction between lithium (Li) and sulfur (S). In the equation, why is the number 2 present in front of lithium on the reactants side of the equation?

a)

to show the number of lithium atoms involved in the reaction

b)

to show the number of electrons gained by lithium in the reaction

c)

to show the atomic number of lithium in the periodic table

d)

to show the number of electrons lost by lithium in the reaction

110.
Henry puts 2.0 grams of baking soda into a 1.0 gram plastic bag. He then pours 5.0 grams of vinegar into the bag and immediately closes it. A reaction takes place. Henry observes a gas being produced, and the plastic bag with the baking soda and vinegar becomes cold to the touch. What will be the total mass of the bag and its contents after the reaction?
a)
8.0 grams
b)
5.0 grams
c)
6.0 grams
d)
7.0 grams
111.

A student adds universal indicator to a solution, and the solution turns the color shown as "2" in this image. The solution must be

a)

strongly acidic.

b)

slightly basic.

c)

slightly acidic.

d)

strongly basic.

112.
Methane and oxygen react to form carbon dioxide and water. The reaction speed can be increased by:
a)
increasing the concentration of oxygen.
b)
increasing the concentration of carbon dioxide.
c)
decreasing the concentration of water.
d)
decreasing the concentration of methane.
113.
Which of the following factors can influence the rate of a chemical reaction?
a)
all of these
b)
the experimental temperature
c)
the presence of a catalyst
d)
the concentration of the reactants
114.
A chemical equation is a way of describing how
a)
pure substances change to produce one or more pure substances with different properties from the original substances.
b)
a mixture of substances change to produce one or more mixtures with the same properties as the original substances.
c)
pure substances are combined into a mixture that has the same properties as the original substances.
d)
a mixture of substances are separated into two or more pure substances that do not react with each other.
115.
A solution of baking soda has a pH of 9. Baking soda _______.
a)
is a base
b)
is a neutral substance
c)
is an acid
d)
could be either an acid or a base
116.
The substances in a chemical reaction that are combined or separated to form new substances are the _______.
a)
reactants
b)
products
c)
coefficients
d)
chemical equations
117.
During science lab, Jacob mixes together sodium hydroxide (NaOH) and hydrochloric acid (HCl). The two chemicals react to form sodium chloride (NaCl) and water (H2O). Which of the following are reactants in the chemical reaction?
a)
sodium hydroxide and hydrochloric acid
b)
hydrochloric acid and water
c)
sodium chloride and water
d)
sodium hydroxide and sodium chloride
118.
Litmus paper can be used to determine the _______ of a substance.
a)
relative pH
b)
temperature
c)
chemical formula
d)
relative volume
119.
Dr. West mixes zinc (Zn) and hydrochloric acid (HCl) together in his laboratory. The two chemicals react to form hydrogen gas (H2) and zinc chloride (ZnCl2). Which of the following are products in the chemical reaction?
a)
hydrogen gas and zinc chloride
b)
zinc and hydrogen gas
c)
zinc and hydrochloric acid
d)
hydrochloric acid and zinc chloride
120.
Which of the following will increase the rate of a chemical reaction?
a)
increasing the surface area of the reactants
b)
decreasing the experimental temperature
c)
decreasing the concentration of the reactants
d)
all of these
121.
Carrie's teacher hands out test tubes filled with different chemicals and tells the students to identify their liquid as an acid, base, or neutral chemical. Carrie's test tube contains a clear chemical. She adds phenolpthalein to her test tube and gently moves the tube from side to side. A few moments later, the chemical in the test tube turns bright pink. What type of chemical does Carrie have?
a)
Carrie has a basic chemical.
b)
Carrie has an acidic chemical.
c)
The type of chemical Carrie has cannot be determined.
d)
Carrie has a neutral chemical.
122.
Vinegar has a pH of 2. Vinegar _______.
a)
is an acid
b)
is a base
c)
could be either an acid or a base
d)
is a neutral substance
123.
Which of the following would most likely cause a chemical reaction to occur at a slower rate?
a)
decreasing the temperature of the reaction
b)
stirring the substances together vigorously
c)
increasing the temperature of the reaction
d)
dissolving the reacting substances in water
124.
When using pH paper, the pH of a solution can be determined by looking at the _______ of the paper.
a)
color
b)
mass
c)
texture
d)
length
125.
Which of the following shows a chemical reaction in which silicon tetrachloride and water are the reactants and silicon dioxide and hydrochloric acid are the products?
a)
silicon tetrachloride + water → silicon dioxide + hydrochloric acid
b)
silicon tetrachloride + hydrochloric acid → silicon dioxide + water
c)
silicon tetrachloride + silicon dioxide → water + hydrochloric acid
d)
silicon dioxide + hydrochloric acid → silicon tetrachloride + water

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