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STEM Chem Unit 2 Review

Total questions: 137

Worksheet time: 34hrs 15mins

Name
Class
Date
1.
How many moles are in 16.94g of water?
a)
16.94 mol H2O
b)
0.9401 mol H2O
c)
305.3 mol H2O
d)
1.063 mol H2O
2.
How many moles are in 19.82 g Mg? 
a)
1.226mol Mg
b)
481.7mol Mg
c)
1.000mol Mg
d)
 0.8156 mol Mg
3.

What is the mass in grams of 2.3456 moles of W?

a)

431.22 grams

b)

6.02 grams

c)

207.2 grams

d)

486.01 grams

4.

How many moles are in 1459 grams of Na?

a)

63.46 moles

b)

60.36 moles

c)

10 moles

d)

1 mole

5.

How many moles are in 20g of potassium (K)?

a)

782 mol

b)

512 mol

c)

0.512 mol

d)

0.023 mol

6.

How many grams are in 0.375 mol KBr

a)

39,10 g

b)

44.625 g

c)

0.003 g

d)

56.525 g

7.

How many moles are in 10 g of salt (NaCl)?

a)

0.171 mol

b)

0.086 mol

c)

3.42 mol

d)

58.45 mol

8.

How many moles are equal to 89.23 g of calcium oxide, CaO?

a)

1.59 mol

b)

2.03 mol

c)

1.77 mol

d)

3.21 mol

9.

How many moles are in 100 g of carbon dioxide, CO2?

a)

2.27 mol

b)

2.36 mol

c)

3.51 mol

d)

1.49 mol

10.

What is the mass in grams of 5.90 mol C8H18?

C= 12.01 g

H=1.01 g

Round to nearest HUNDREDTHS place (2 dp)

(a)  

11.

How many moles are in 9.8 grams of calcium? 

Round to nearest HUNDREDTHS place (2 dp)

(a)  

12.

How many moles are in 22 g of argon? 

Round to nearest hundredths place (2 dp)

(a)  

13.

36.0 g of Be contains how many moles?

Round to nearest whole number

(a)  

14.

4.0 moles of H2O would have what mass?

Round to nearest hundredths place (2 dps)

(a)  

15.

How many grams are in 88.1 moles of magnesium?

Round to nearest hundredths place (2 dp)

(a)  

16.

Determine the amount of moles of BaCl2 that are in 436 g of the compound.

Round to nearest hundredths place (2 dp)

(a)  

17.

Find the mass of 5.82 mol of MgCl2.

Round to the nearest hundredth place (2 dp).

(a)  

18.

Find the mass of 3.8 mol of H2O.

Round to the nearest hundredth place (2 dp).

(a)  

19.

Find the mass of 3.6 mol of Au.

Round to nearest HUNDREDTHS place (2 dp)

(a)  

20.

(0903) Suzie wants to know the mass of 1.55 moles of nitrogen trichloride. How do you set up the problem?

a)

1.55 mole NCl3 × 1 molemolar mass of NCl3 (g)=1.55\ mole\ NCl_3\ \times\ \frac{1\ mole}{molar\ mass\ of\ NCl_3\ \left(g\right)}=

b)

1.55 mole NCl3 × molar mass of NCl3 (g)1 mole=1.55\ mole\ NCl_3\ \times\ \frac{molar\ mass\ of\ NCl_3\ \left(g\right)}{1\ mole}=

c)

 1 mole × 1.55 mole NCl3molar mass of NCl3(g)=\ 1\ mole\ \times\ \frac{1.55\ mole\ NCl_3}{molar\ mass\ of\ NCl_3\left(g\right)}=

d)

 molar mass of NCl3(g) × 1 mole1.55 mole NCl3=\ molar\ mass\ of\ NCl_3\left(g\right)\ \times\ \frac{1\ mole}{1.55\ mole\ NCl_3}=

21.

How many grams are in 2 moles of Sulfur?

Round to TENTHS place (1 dp)

(a)  

22.

How many grams are in 3.5 moles of Helium (He)?

Round to nearest whole number (no dp)

(a)  

23.

How many moles are in 35 grams of Silicon (Si)?

Round to nearest HUNDREDTH place (2 dp)

(a)  

24.

Shivani measures out 6.0 moles of epsom salt (MgSO4) to put in her bath. How many grams of MgSO4 went in the bath?

Round to nearest WHOLE NUMBER

(a)  

25.
Which of the following dimensional analysis setups will correctly convert 2.50 moles of sodium to grams of sodium?
a)
A
b)
B
c)
C
d)
D
26.

Calculate how many moles are in 10 grams of magnesium oxide, MgO

Round to the nearest HUNDREDTH place (2 dp)

(a)  

27.

Calculate the mass of 0.25 moles of magnesium oxide, MgO

Round to nearest HUNDREDTH place (2 dp)

(a)  

28.

Calculate the mass of one mole of magnesium oxide, MgO

Round to nearest HUNDREDTH place (2 dp)

(a)  

29.

What would the mass of 2.5 moles of ethanol (C2H5OH) be?

Round to nearest TENTH place (1 dp)

(a)  

30.

How many moles of ethanol (C2H5OH) would be in 115 grams?

Round to the nearest TENTH place (1 dp)

(a)  

31.

What would the mass of 6 moles of sulfur dioxide SO2 be?

Round answer to nearest TENTH place (1 dp)

(a)  

32.

What would the mass of 1.25 moles of sulfur dioxide SO2 be?

Round to the nearest TENTH place (1 dp)

(a)  

33.

What would the mass of 1.25 moles of water be?

Round to nearest hundredth place (2 dp)

(a)  

34.

What would the mass of 3 moles of water be?

Round to nearest hundredth place (2 d.p.)

(a)  

35.
Ice melting
a)
Chemical Change
b)
Physical Change
36.
Water freezing
a)
Chemical Change
b)
Physical Change
37.
Wood burned in a fireplace
a)
Chemical Change
b)
Physical Change
38.
Cake batter baked in an oven
a)
Chemical Change
b)
Physical Change
39.
Baking soda and vinegar combine to make carbon dioxide
a)
Chemical Change
b)
Physical Change
40.
Glass bottle that is shattered
a)
Chemical Change
b)
Physical Change
41.
Is wood burning a physical or chemical change?
a)
Physical 
b)
Chemical
42.
Is melting butter for popcorn a chemical or physical change?
a)
chemical
b)
physical
43.

Scrambling eggs is an example of

a)

A physical change

b)

A chemical change

c)

Solution

44.

Tearing paper into small pieces is an example of a

a)

Mixture

b)

Physical change

c)

Chemical change

45.

Which of the following is a chemical change?

a)

Cutting bread

b)

Slicing carrots

c)

Melting butter

d)

Soured milk

46.

Which of the following is a physical change?

a)

Ice melting

b)

Baking potatoes

c)

Rusty nail

d)

Rotting wood

47.

Which change creates a NEW substance?

a)

Physical change

b)

Chemical Change

48.

Heating a solid until it changes color and produces an odor, and noting the solid cannot be changed back is an example of

a)

Physical Change

b)

Chemical Change

49.
Sodium Hydroxide dissolves in water
a)
Chemical Change
b)
Physical Change
50.

A green powder is heated & a gas is given off while it turns to a black solid. This describes

a)

Physical Change

b)

Chemical Change

c)

Change in State

d)

Change in Temperature

51.

A Chemical Change is also known as what?

a)

Physical Change

b)

Physical Property

c)

Chemical Reaction

d)

Chemical Property

52.

Which of the following could indicate that a chemical change took place?

a)

Change in color

b)

Production of Energy

c)

Formation of Gas

d)

All are correct

53.

Identify what type of change happening in the picture below...

a)

Chemical Change

b)

Physical Change

c)

Endothermic Reaction

d)

Exothermic Reaction

54.

Identify what type of change happening in the picture below...

a)

Chemical Reaction

b)

Physical Change

c)

Change in State

d)

Change in appearance only

55.

Which of the following is an example of a physical change?

a)

A glass falling and shattering on the floor.

b)

Baking a birthday cake.

c)

Burning a piece of paper.

d)

Baking soda and vinegar mixing together.

56.

A property that is observed without making changes to the substance.

a)

Chemical Reaction

b)

Chemical Property

c)

Physical Property

d)

Physical Reaction

57.

This change is a

a)

chemical reaction

b)

physical change

c)

musical change

d)

Ice Ice baby

58.
Salt dissolves in water
a)
physical Change
b)
chemical change
59.
Physical or Chemical Change?  Iron rusts
a)
Physical Change
b)
Chemical Change
60.
Is copper tarnishing a physical or chemical change?
a)
Physical 
b)
Chemical
61.
Frying an egg
a)
Physical Change
b)
Chemical Change
62.
freezing chocolate covered bananas
a)
physical change
b)
chemical change
63.

Which is an example of a chemical change?

a)
b)
c)
d)
64.

Which is an example of a chemical change?

a)
b)
c)
d)
65.

Which is an example of a physical change?

a)
b)
c)
d)
66.

Which is an example of physical property?

a)

color

b)

flammability

c)

reactivity

d)

toxicity

67.

Which of the following are examples of PHYSICAL changes?

a)
b)
c)
d)
e)
68.

Which of the following are CHEMICAL changes?

a)
b)
c)
d)
e)
69.

Which characteristics show a CHEMICAL change has taken place?

a)

breaking

b)

change in temperature

c)

change in size or shape

d)

bubbles

e)

gas

70.

Which characteristics show a CHEMICAL change has taken place?

a)

tearing

b)

odor

c)

folding

d)

change in color

e)

sound

71.

An ice pack getting cold after you put it in the freezer for an hour is a

a)

chemical Change

b)

physical Change

72.

Exploding fireworks is a

a)

Physical Change

b)

Chemical Change

c)

Katy Perry Song

73.

Which answer below makes a correct statement?

a)

Physical change only changes the color.

b)

Physical change only changes the size.

c)

Physical change changes the matter into something totally different.

d)

Physical change begins and ends with the same matter.

74.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
75.
Fizzing, foaming, and burning are all examples of
a)
Chemical change
b)
Physical change
76.
Which is an example of a chemical reaction?
a)
paper cut into small pieces
b)
chocolate melting in a pan
c)
flour and sugar mixed in a bowl
d)
cookies baking in an oven
77.

A student mixed two substances in a test tube, he

noticed that the test tube became warm. He also

noticed an odor coming from the test tube. Based

on Jose's observations, what was

most likely occurring inside the test tube?

a)

The substances were melting.

b)

The substances were evaporating.

c)

The substances were undergoing a chemical

reaction.

d)

The substances were undergoing an

endothermic reaction.

78.

Which of the following models a physical

change?

a)

An apple ripens and turns red.

b)

A nail rusts and becomes reddish brown.

c)

A hamburger is cooked and turns brown.

d)

A red apple is cut in half.

79.

A chemical reaction is occurring for certain when

a

a)

solid dissolves.

b)

new substance is formed.

c)

steam-like substance is created.

d)

mixture is made.

80.

After Billy injured his ankle from falling off his

bicycle, his mother placed an ice pack on his

ankle. Pete noticed that the ice in the ice pack

began to melt after about 30 minutes. What was

demonstrated by the melting ice pack?

a)

a chemical change

b)

a physical change

c)

a substance being destroyed

d)

a change in the identity of a substance

81.

Charcoal is often used for outdoor cooking. When

charcoal burns, ashes are left in the bottom of the

grill. What kind of change has taken place?

a)

A solution has formed.

b)

A physical change has occurred.

c)

A mixture has formed.

d)

A chemical change has occurred.

82.

When liquids X and Y react, a solid, Z, is formed.

Combining liquids X and Y causes a

a)

physical change.

b)

chemical change.

c)

change in phase.

d)

change in mass.

83.

Reggie the robot has a brown, flaky substance after being left outside in the rain. What has the rain most likely done to the robot?

a)

It caused a chemical reaction that combined the

atoms in his metal body, causing it to melt.

b)

It caused a chemical reaction that heated up the

atoms in his metal body, causing it to burn.

c)

It caused a chemical reaction that rearranged

the atoms in his metal body, causing it to rust.

d)

It caused a chemical reaction that broke apart

the atoms in his metal body, causing it to decay.

84.

When Sally and her parents first moved into

their house, the brick fireplace was very clean.

Now that they have built a few fires in their

fireplace, the inside is covered with black powder.

Sally's mother tells him this powder is called

soot. Which of the following best explains how

the soot came to be in the fireplace?

a)

A chemical reaction occurred when wood

burned, making a new substance called soot.

b)

The wood in the fireplace evaporated and made

a new substance called soot.

c)

Some of the bricks in the fireplace melted and

made a new substance called soot.

d)

A chemical reaction occurred between the bricks

and air, making a new substance called soot.

85.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

86.
Is digestion an example of a physical change or a chemical change?
a)
Physical Change
b)
Chemical Change
87.
A change in temperature is an indication of which type of change?
a)
Physical Change
b)
Chemical Change
88.

Which is the best example of a new substance forming?

a)

lighting a match

b)

cutting a piece of paper

c)

popping a balloon

d)

hitting a nail with a hammer

89.

A student mixes yellow powder with water. Which observation would prove a CHEMICAL change occurred?

a)

The powder DISSOLVED in the water

b)

The water turned the COLOR yellow

c)

The water's TEMPERATURE changed

d)

The STATE OF MATTER changed

90.

When mixing milk and vinegar (two liquids), a white, chunky, solid substance is formed. What has occurred?

a)

Physical change: state of matter

b)

Chemical change: precipitate (formation of a new solid)

c)

Physical change: freezing

d)

Chemical change: new gas

91.

Jack leaves solid butter near a warm surface. When Jack returns, the butter has turned into a liquid. Jack's friend Elijah insists this is a chemical change. Is Elijah right?

a)

no, because no new matter was formed

b)

yes, because the matter changed states

c)

no, because the butter didn’t have enough time to go through a chemical change

d)

yes, because melted butter is a new type of matter

92.

2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

Ethane (C2H6) combusts in the above reaction. What is the mole ratio of carbon dioxide to water?

a)
b)
c)
d)
93.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
94.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
95.

Drag and drop the coefficients that would balance this equation:

​ (a)   Al + ​ (b)   HCl --> ​ (c)   H2 + ​ (d)   AlCl3

Choose from the below words
2
6
3
1
96.

Drag and drop the coefficients that would balance this equation:

​ (a)   H2 + ​ (b)   O2 --> ​ (c)   H2O

Choose from the below words
1
2
3
4
97.

Drag and drop the coefficients that would balance this equation:

​ (a)   Mg + ​ (b)   O2 --> ​ (c)   MgO

Choose from the below words
2
1
3
4
98.

Drag and drop the coefficients that would balance this equation:

​ (a)   SeCl6 + ​ (b)   O2→ ​ (c)   SeO2 + ​ (d)   Cl2

Choose from the below words
1
3
2
4
99.

Drag and drop the coefficients that would balance this equation:

​ (a)   Zn+​ (b)   HCl -->​ (c)   ZnCl2 + ​ (d)   H2

Choose from the below words
1
2
3
0
4
100.

Drag and drop the coefficients that would balance this equation:

​ (a)   P4 + ​ (b)   O2  -->  ​ (c)   P2O3

Choose from the below words
1
3
2
4
0
101.

Drag and drop the coefficients that would balance this equation:

​ (a)   HgO --> ​ (b)   Hg + ​ (c)   O2

Choose from the below words
2
1
3
4
0
102.

Drag and drop the coefficients that would balance this equation:

​ ​ (a)   Fe + ​ ​ (b)   O2 -> ​ ​ (c)   Fe2O3

Choose from the below words
4
3
2
1
103.
A sealed test tube containing 8 grams of iron filings and 5 grams of sulfur is heated until the material in the test tube glows bright red.  What is the mass of products? 
a)
Mass is less than 13 grams
b)
Mass is equal to 13 grams
c)
Mass is greater than 13 grams
d)
Mass cannot be measured
104.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
105.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
106.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
107.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
108.
What is the number before a chemical formula called?
Ex: 2H2 + O2 --> 2H2O
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
109.
How many aluminum atoms are in Al2(SO4)3?
a)
1
b)
2
c)
3
d)
4
110.

Determined whether the following equation is balanced or unbalanced.

Ag + O2 ---> 2Ag2O

a)

Balanced

b)

Unbalanced

111.

Determine whether the following equations is balanced or unbalanced.

H2 + O2 ---> 2H2O

a)

Balanced

b)

Unbalanced

112.

Determine whether the following equation is balanced or unbalanced.

4P +5O2 ---> 2P2O5

a)

Balanced

b)

Unbalanced

113.

Determine whether the following equation is balanced or unbalanced.

H2 + Br2 ---> 2HBr

a)

Balanced

b)

Unbalanced

114.

In order for an equation to be balanced, there must be ...

a)

an equal amount of atoms on both sides

b)

a greater mass on the product side

c)

a greater mass on the reactant side

d)

elements with the same atomic # on both sides

115.

Drag and drop the coefficients that would balance this chemical equation?

​ ​ ​ (a)   Fe2O3 ---> ​ ​ ​ (b)   Fe + ​ ​ ​ (c)   O2​

Choose from the below words
2
4
3
1
116.

Drag and drop the coefficients that would balance this chemical equation:

​ ​ ​ (a)   K + ​ ​ ​ (b)   Cl2 ---> ​ ​ (c)   KCl

Choose from the below words
2
1
3
0
117.
How many phosphorus atoms are in PO4?
a)
1
b)
2
c)
3
d)
4
118.
How many hydrogen atoms are in 2 H2?
a)
1
b)
2
c)
3
d)
4
119.
How many Iron (Fe) atoms are in this chemical formula?
a)
2 iron atoms
b)
6 iron atoms
c)
5 iron atoms
d)
4 iron atoms
120.

Which best represents a balanced equation?

a)

120 grams of carbon plus 20 grams of oxygen → 200 grams of carbon dioxide

b)

120 grams of carbon plus 50 grams of oxygen → 200 grams of carbon dioxide

c)

120 grams of carbon plus 80 grams of oxygen → 200 grams of carbon dioxide

121.

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.

122.

A chemistry teacher combines 20 grams of lemon juice with 25 grams of baking soda in a flask covered with a balloon. The flask and balloon have a combined mass of 105 grams. What is the mass of the entire setup after a reaction has occurred?

a)

45 g

b)

150 g

c)

605 g

123.

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)

100 g

b)

104 g

c)

105 g

d)

110 g

124.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
125.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
126.
Which is the correct formula for:
one carbon (C)
two oxygen (O)
a)
CO2
b)
CO
c)
C2O
d)
2CO
127.

In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?

a)

2Mg and O2

b)

2MgO

c)

2Mg and 2MgO

d)

O2 and 2MgO

128.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
129.

Is the following equation balanced or unbalanced?

Fe + S --> FeS

a)

balanced

b)

unbalanced

130.
What are the smaller numbers that you CANNOT change in a chemical equation? 
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscript
131.
What are the larger numbers that you CAN CHANGE in a chemical equation? 
a)
Coefficient 
b)
Products
c)
Reactants
d)
Subscripts
132.
What law governs the balancing of chemical equations? 
a)
Law of Energy
b)
Law of Conservation of Matter/Mass
c)
Law of Gravity
d)
Law of Matter Movement 
133.

Drag and drop the coefficients that balance this equation

​ (a)   Fe  + ​ (b)   Cl2 ---->  ​ (c)     FeCl3

Choose from the below words
3
2
1
134.

Balance this equation ​ (a)   N2 + ​ (b)   H2 --> ​ (c)   NH3

Choose from the below words
1
3
2
135.

According to the Law of Conservation of Mass (Matter), Matter cannot be ​ (a)   or ​ (b)   , it can only be ​ (c)   . This means however many atoms of an element we have before a reaction must be ​ (d)   to the number after a reaction.

Choose from the below words
created
destroyed
changed
equal
136.

In 3P2O5, there are ​ (a)   phosphorus (P) atoms and ​ (b)   oxygen (O) atoms.

Choose from the below words
6
15
8
3
12
21
137.

Balance this equation:

​ (a)   Fe + ​ (b)   O2 --> ​ (c)   Fe2O3

Choose from the below words
4
3
2
1
0

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Unit 4 Review: Periodic table, Bonding , Nomenclature

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