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Chemical Formulas, Equations, and Reactions

Total questions: 55

Worksheet time: 1hrs 10mins

Name
Class
Date
1.

Match the following chemical formulas/equations terms to their definitions

a)

Gives the number of molecules

1.

Coefficient

b)

Gives the number of atoms of each element

2.

Subscript

c)

The substances involved in a chemical reaction

3.

Reactants

d)

The substances produced by a chemical reaction

4.

Products

2.

New substances are formed when the ​ (a)   of substances are rearranged during a​ (b)   reaction. The law of ​ (c)   of mass states that the total number of atoms of each ​ (d)   is not created or ​destroyed during a chemical reaction. Instead, the atoms are ​ (e)   to form new substances.

Choose from the below words
atoms
chemical
conservation
element
rearranged
compound
physical
3.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
4.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
5.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
6.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
7.
Na + MgF2 -->  NaF + Mg
What are the reactants?
a)
Na + MgF2
b)
Na
c)
NaF + Mg
d)
NaF
8.
NH3 ---> N2 + H2
What are the products?
a)
N2 + H2
b)
N2
c)
H2
d)
NH3
9.
All of the following are chemical changes except
a)
iron rusting
b)
water evaporating
c)
wood burning
d)
food rotting
10.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes
b)
Oxygen is present
c)
A new substance is produced
d)
Coal is made up of more than one element
11.

How many different kinds of elements are there?

a)

4

b)

3

c)

2

d)

1

12.

How many molecules of caffeine are there?

a)

2

b)

5

c)

10

d)

24

13.

How many elements are there?

a)

0

b)

1

c)

3

d)

5

14.

How many atoms of hydrogen are there?

a)

2

b)

4

c)

6

d)

11

15.

How many carbon atoms are there?

a)

2

b)

3

c)

8

d)

16

16.

How many atoms of carbon are there?

a)

2

b)

4

c)

12

17.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
18.
How many molecules are in 10MgCl2?
a)
10
b)
2
c)
30
d)
13
19.
The law of conservation of mass states that....
a)
Matter can be created
b)
Matter is sometimes destroyed
c)
Matter cannot be created or destroyed
d)
Matter can be created but not destroyed
20.

Which of the following correctly identifies the number of each element involved in the chemical formulas? NH4CO3

a)
b)
c)
d)
21.

A model of one molecule of a chemical compound is shown. What is the correct way to write the formula for three molecules of this compound?

a)

A. 2H2O

b)

B 3(2H2O)

c)

C. H2O2

d)

D. 3H2O2

22.

Which of the following examples would support that a chemical reaction has occurred?

a)

A. After putting liquid batter into a hot pan, the batter solidifies and begins to turn brown.

b)

B. After turning on a blender filled with fruits, the fruit is chopped up and mixed together.

c)

C. After taking a tray filled with ice cubes out of the freezer, the cubes begin to melt.

d)

D. After adding a spoonful of sugar to a mug of hot coffee, the sugar dissolves completely.

23.

When vinegar and baking soda are combined, bubbles begin to form. Bubbles are evidence of a chemical reaction because they -

a)

A. are less dense than air.

b)

B. form at a fast rate.

c)

C. released a gas

d)

D. have no mass.

24.

During an experiment, a student combines a solid, metallic substance with a clear liquid in a beaker. The mixtures turns hot, produces bubbles, and sparks. Based on the observations, the student can conclude that –

a)

A. a phase change has occurred.

b)

B. atoms have been rearranged to form a new substance.

c)

C. the products are likely harmful to human skin.

d)

D. the metal substance is a poor conductor of heat.

25.
A copper penny turning greenish after a few years is an example of...
a)
Chemical Change
b)
Physical Change
26.
Which of the following could indicate a chemical change? 
a)
All of the answers could indicate Chemical Change 
b)
a color change has occurred 
c)
bubbles appear 
d)
properties are different after a reaction
27.

In air, phosphorous, a white solid, spontaneously reacts to produce a pale, green light. Why might the green light be evidence of a chemical reaction?

a)

Green is a color associated with reactions.

b)

Phosphorous is a solid at room temperature.

c)

The reaction will not occur in a closed container.

d)

It indicates a change in temperature.

28.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
29.
In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 
a)
4g
b)
5g
c)
9g
d)
14g
30.
A chemical reaction between Hydrogen and Oxygen produces water. If 2g of Hydrogen and 4g of Oxygen react together, how much water is produced?
a)
2g
b)
4g
c)
6g
d)
Not enough information to answer
31.
12g of Carbon react with 16g of Oxygen, how much carbon monoxide (CO) is formed? 
a)
28 g
b)
4g
c)
30g
d)
12g
32.

4 grams of hydrogen and 32 grams of oxygen will combine to form:

a)

36 grams of water

b)

28 grams of hydroxide

c)

32 grams of oxygen

d)

36 grams of deuterium

33.

Jackie and Josh wanted to do an experiment to demonstrate the Law of Conservation of Mass. To do this, they measured the mass of baking soda and vinegar (reactants) and received a mass of 35g. Then, they mixed the two substances and after the reaction, the mass was measured at 33g. What is the possible explanation as to why the mass was not the same before and after the reaction?

a)

Mass was destroyed in the reaction.

b)

They did not measure correctly.

c)

The students did not include an instrument to capture the gas produced in the reaction.

d)

These two substances do not react so nothing would have happened.

34.
A 500-gram block of solid cheese is melted in a pot. Which is most likely the mass of the cheese after it is melted?
a)
500 grams, because the cheese does not gain or lose mass just because it was melted
b)
499 grams, because some of the cheese evaporates as it melts
c)
502 grams, because the cheese absorbs heat as it melts
35.
A student notices that an inflated balloon gets larger when it is warmed by a lamp. Which best describes the mass of the balloon as a result of this change?
a)
The mass of the balloon increases because the size of the balloon has increased.
b)
The mass of the balloon increases because the temperature of the balloon has increased.
c)
The mass of the balloon stays the same because the gas inside the balloon still has the same mass after it warms up.
36.
Jamie weighs a glass of water and observes its weight to be 12 ounces. Jamie then adds 6 ice cubes to the glass of water. Each ice cube weighs one ounce. After all of the ice cubes have melted, what will be theapproximate weight of the glass of water?
a)
6 
b)
12 
c)
18 ounces
37.
A 55-gram egg is placed in a pot. After the egg is boiled, which is most likely the mass of the egg?
a)
50 
b)
55 
38.

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B have?

a)

4g

b)

5g

c)

9g

d)

14g

39.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
40.
What will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?
a)
They both will weigh the same
b)
The product always weighs more than the reactant
c)
The reactant will weigh more than the product
d)
They both will loose mass after the reaction
41.
If a reaction starts with a total 75g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 75g of products
c)
a total of 180 g of products
d)
None of the above
42.
In the reaction AB-----> A + B reactant AB has 12g and product B has 5g. How many grams should product A have?
a)
17g
b)
2g
c)
7g
d)
None of the above
43.
12g of Carbon react with 16g of Oxygen, how much carbon monoxide (CO) is formed? 
a)
28 g
b)
4g
c)
30g
d)
12g
44.
24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride
a)
62 
b)
38
c)
24
d)
14
45.

32 g of Oxygen completely reacts with 8 g of Hydrogen to produce _____ g Water

a)

8

b)

12

c)

24

d)

40

46.

4 grams of hydrogen and 32 grams of oxygen will combine to form:

a)

36 grams of water

b)

28 grams of hydroxide

c)

32 grams of oxygen

d)

36 grams of deuterium

47.

In a chemical reaction, 4 grams of sodium must combine with how many grams of chlorine to produce 10 grams of table salt?

a)

4 grams

b)

6 grams

c)

8 grams

d)

10 grams

48.

Why does this picture demonstrate the Law of Conservation of Mass?

a)

the number of atoms of each element are the same on both sides

b)

they start out separate and end up combined

c)

the same elements are used

d)

it doesn't demonstrate the Law of Conservation of Mass

49.

When a log is burned, what happens to the wood?

a)

The mass stays the same, but becomes smoke and ash.

b)

It disappears.

c)

The mass changes as it goes away.

d)

Nothing. You're imagining things.

50.

Balanced or Not?


H2 + Cl2 ---> 2HCl

a)

Balanced

b)

Unbalanced

51.

Balanced or Not?


H2 + O2 ---> H2O

a)

Balanced

b)

Not

52.

Balanced or not?


N2+6H2 ----> 2NH6

a)

Balanced

b)

Unbalanced

53.

How many oxygen atoms are in the products for the chemical reaction below?
4Fe + 3O2 → 2Fe2O34Fe\ +\ 3O_{2\ }\rightarrow\ 2Fe_2O_3  

a)

2

b)

3

c)

5

d)

6

54.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
55.

Is mass being conserved?

a)

Yes

b)

No

c)

Not enough information

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