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Law of Conservation of Mass/Matter 2

Total questions: 55

Worksheet time: 1hrs 2mins

Name
Class
Date
1.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, changed
d)
None of the above
2.

The small number to the lower side of an element is a

a)

Subscript

b)

Superscript

c)

Coefficient

d)

Charge

3.

The large number in front of a compound or element is a

a)

Subscript

b)

Coefficient

c)

Superscript

d)

Charge

4.

What is the coefficient in compound 8H6O?

a)

6

b)

2

c)

8

d)

48

5.

If reaction starts with 20g of reactants then how much product should produced

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

6.

In a reaction A + B ----> C,  reactant A has 10g and product C has 32g. How many grams does reactant B should have? 

a)

22g

b)
5g
c)
9g
d)
14g
7.

What is the measure of the amount of matter in a subsance?

a)
mass
b)

size

c)

pounds

d)
density
8.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
9.
The Law of Conservation of matter states that the total amount of matter ______________ after it undergoes change.
a)
disappears
b)
stays the same
c)
weighs less
d)
explodes
10.
An oreo cookie weighs 20 grams.  It gets crushed into crumbs for a recipe.  How much do its crumbs weigh?
a)
15 grams
b)
25 grams
c)
20 grams
11.

Which of the following are Subscripts in this Chemical Formula: 3Fe2O4

a)

3,4

b)

3,2

c)

2,4

d)

6

12.

How many nitrogen atoms does the compound N6H3 have?

a)

6

b)
2
c)
3
d)
4
13.

How many (Fe) iron atoms are in this chemical formula?

a)

6 iron atoms

b)

2 iron atoms

c)

3 oxygen atoms

d)

4 iron atoms

14.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
15.

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

16.

What do we call the chemicals that are created from a chemical reaction?

a)

reactants

b)

products

c)

subscripts

d)

coefficients

17.

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

a)

7

b)

10

c)

17

d)

20

18.

According to the Law of Conservation of Mass, what would happen to wood and oxygen when it is burned?

a)

The wood disappears.

b)

It stays the same chemically.

c)

The atoms in the wood and oxygen rearrange and form smoke and ash.

d)

Nothing.

19.

Substances present at the start of a chemical reaction. What we start with are called the __________.

a)

subscripts

b)

coefficients

c)

reactants

d)

products

20.

A 35gram egg is placed in a pot. After 15 minutes the egg is boiled, which is most likely the mass of the egg?

a)
50 
b)
55 
c)

105

d)

35

21.

12g of Carbon is added to 28g of Oxygen, how much carbon monoxide (CO) is formed?

a)

28 g

b)

40g

c)

30g

d)

12g

22.

When sodium and chlorine combine to form sodium chloride, sodium chloride is the:

a)

Originator

b)

Reactant

c)

Product

d)

yield

23.

How many Hydrogen atoms are in 8H2O?

a)

16

b)

8

c)

2

d)

4

24.

What will have more mass when a chemical change is complete:

the reactants or the product

a)

They both will have the same mass

b)

The product always has more mass than the reactant

c)

The reactant will have more mass than the product

d)

They both will lose mass after the reaction

25.
If there are 4 H atoms on the reactant side, how many H atoms will be on the product side? 
a)
2
b)
4
c)
6
d)
You need more information to answer this question
26.

A student mixes 15 grams of sugar, 250 grams of water and 15 grams of flavoring. The solution weighs...

a)

250 grams

b)

280 grams

c)

375 grams

d)

400 grams

27.

Jamie weighs a glass of water and observes its weight to be 12 ounces. Jamie then adds 10 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
d)

22 ounces

28.

Two or more atoms joined together form a _____.

a)

atom

b)

molecule

c)

solution

d)

mixture

29.

Which two of the following would be classified as a molecule?

a)

NaCl

b)

H2

c)

Fe

d)

dirt

30.

What is the smallest particle of anything in the universe?

a)

cells

b)

gases

c)

atoms

d)

liquids

31.

How many different elements make up the compound Fe10C6H12O6?

a)

1

b)

28

c)

4

d)

36

32.
What do we call a chemical substance made up of 2 or more different types atoms bonded together?
a)
formula
b)
atom
c)
subscript
d)
compound
33.

Which of the following is an element?

a)

H2O

b)

O

c)

NaCl

d)

FeO

34.

Which of the following would not be an example of matter?

a)

Dog

b)

Dust

c)

Air

d)

Water

e)

Neither, they are all forms of matter

35.

What is the total mass of the following compound C6H12O6?

a)

10

b)

2

c)

24

d)

18

36.

1. Jimmy said all compounds are molecules but not all molecules are compounds.

2. Rachel said all compounds are molecules and all molecules are compounds.

3. Raberto said they both are wrong.

4. Dalton saId all compounds are compounds but not all molecules are molecules.

Who is correct?

a)

Raberto

b)

Rachel

c)

Jimmy

d)

Dalton

37.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
38.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
39.
What is the arrow in a chemical equation...
H2 + O --> H2O
a)

Reactants or equal symbol

b)

Products or reactants symbol

c)

Produces or yields symbol

d)

to turn right

40.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
41.
Balance this equation-
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
42.

The red numbers in the image below represent ________

a)
Charges
b)
coefficients
c)
subscripts
d)
none of the answers are correct
43.
The blue numbers in the image below represent ________
a)
Charges
b)
coefficients
c)
subscripts
d)
none of the answers are correct
44.
Which side of a chemical equation is the reactant side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
45.

Which side of a chemical equation is the product side?

a)
Left (before the yields sign)
b)
Right (after the yields sign)
46.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
47.
These contain only one kind of atom. 
a)
element 
b)
compound 
c)
mixture 
d)
water 
48.

The air we breath is classified as a _________. 

a)
element 
b)
mixture 
c)
compound 
d)
energy 
49.

Pure water is a ___________.

a)

element

b)

mixture

c)

compound

50.

What would we classify salt as?

a)
compound 
b)
element 
c)
mixture 
51.

Matter is anything that has ___ and takes up space (volume)

a)

space

b)

color

c)

smell

d)

mass

52.

Which one is an element

a)

water

b)

oxygen

c)

cereal

d)

atom

53.

Which TWO answers are examples of elements?

a)

Water

b)

Hydrogen

c)

Trees

d)

Helium

54.

A substance made from 2 or more different kinds of atoms chemically combined is a(an)...

a)

element

b)

molecule

c)

compound

d)

mixture

55.

What is fruit salad with yogart classified as?

a)

Compound

b)

Element

c)

Mixture

d)

a mess

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