wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

Law of Conservation of Mass

Total questions: 65

Worksheet time: 2hrs 4mins

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.
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
3.
This type of system allows matter to flow freely in and out...
a)
Closed System
b)
Open System
4.
A boiling pot with a lid on it to keep in the energy is what type of system?
a)
Closed System
b)
Open System
5.
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
6.
Since gasses weigh nothing, when they are produced in a reaction they do not have to be accounted for.  
a)
True
b)
False
7.
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
8.
Which of these is not a chemical reaction?
a)
Burning of wood
b)
Milk going bad
c)
Mixing vinegar and baking soda
d)
Melting of ice
9.

According to the Law of Conservation of Mass, what happens to the 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.

10.
Measure of the amount of matter 
a)
mass
b)
volume
c)
weight
d)
density
11.
Is melting butter for popcorn a chemical or physical change?
a)
chemical
b)
physical
12.
a)
Physical Change
b)
Chemical Change
13.
a)
Physical Change
b)
Chemical Change
14.
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
15.
What is the definition of chemical change?
a)
any change that results in the formation of new chemical substances. 
b)
changing clothes
c)
matter cannot be created or destroyed, only change form
d)
changes affecting the form of a chemical substance, but not its chemical composition.
16.
What are the three states of matter?
a)
solid, liquid, and gas
b)
solid, water, and gas
c)
wood, liquid, and gas
d)
solid, liquid, and helium
17.
The amount of matter something contains is its ______________.
a)
gas
b)
solid
c)
weight
d)
mass
18.
________________ is anything that has mass and takes up space.
a)
volume
b)
matter
c)
mass
d)
weight
19.
Volume is the amount of space an object takes up.
a)
True
b)
False
20.

How would you find the mass of an object?

a)

Measure its dimensions with a ruler, and then multiply length x width x height

b)

Water displacement

c)

use a balance/scale

d)

use a timer

21.
What types of systems are there?
a)
Mechanical and Electrical Systems
b)
Inside and Outside Systems
c)
Open and Closed Systems
d)
Human and Machine Systems
22.
This type of system requires interaction with the environment around it
a)
Closed System
b)
Open System
23.

How tightly packed matter is in an object.

a)

Volume

b)

Density

c)

Mass

d)

Mixture

24.

What is a mixture?

a)

two substances that are physically combined

b)

anything that has mass and takes up space

c)

substance made of two or more chemically combined elements

d)

a single atom that cannot be broken down easily

25.

In a mixture, substances loose their identities and properties.

a)

true

b)

false

26.

Which of the following diagrams represents a pure substance? (all the same atom with the same composition or 2 different atoms bonded with the same composition)

a)
b)
c)
d)
e)
27.
When a solid reaches the temperatures of its ___, it can become a liquid.
a)
melting point
b)
freezing point
c)
boiling point
d)
density
28.
Which state of matter has particles that are tightly packed?
a)
liquid
b)
gas
c)
solid
29.
Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is its density?
a)
3 g/cm3
b)
1/3 g/cm3
c)
27 g/cm3
d)
39 g/cm3
30.

This diagram represents...

a)

An element

b)

A molecule

c)

A compound

d)

A mixture of elements and compounds

31.

What word describes the relationship between the mass of a material and its volume?

a)

Volume

b)

Weight

c)

Height

d)

Density

32.

Rusting is when substances react slowly with _________.

a)

Water

b)

Oxygen

c)

Hydrogen

d)

Lithium

33.
Which of the following is a pure substance? 
a)
Water
b)
Salad
c)
Chocolate milk
d)
All of them 
34.

A group of 2 or more items, that are not chemically combined

a)

Pure Substance

b)

Mixture

35.

How can we determine if 2 unknown substances are the same or different substance?

a)

observe the size of each substance

b)

observe the shape of the substances

c)

test properties of the substances

d)

make a hypothesis, educated guess

36.

Mixing kool-aid powder and water together makes a new substance.

a)

True

b)

False

37.

When 2 or more substances are mixed together and the resulting substances properties HAVE NOT changed a chemical reaction has occurred.

a)

True

b)

False

c)

Maybe

38.

When a substance goes through a phase change ___.

a)

molecules are rearranged in some of the substances

b)

molecules rearrange making new substances

c)

a chemical reaction occurs

d)

the atoms making up molecules are not rearranged

39.

A phase change IS NOT a chemical reaction. Choose the options that support this claim. You may choose more than one.

a)

The substance are mixed together and keep their properties

b)

The atoms making up the molecules are rearranged creating new substances

c)

The atoms and molecules are mixed together BUT do not create new molecules

d)

The atoms are rearranged creating a new product with a different arrangement of atoms

40.

Scientific principle #6 states: properties of a given substance are the same regardless of the amount of the substance. Based on this scientific principle, which options below will not change if the amount of a substance is increased?

a)

melting point of the substance

b)

volume of the substance

c)

mass of the substance

d)

density of the object

e)

solubility of the substance

41.

According to scientific principle #6 properties (denstiy, hardness, melting point, solubility) of a substance will:

a)

change because it isn't possible to stay the same if the amount changes

b)

stay the same ONLY if the amount of the substance is the same

c)

stay the same, even if the amount of the substance is different

d)

change based on the amount of the substance present

42.

Ice can change from a solid (ice) to liquid (water) to gas (water vapor). What vocabulary term does this describe?

a)

chemical reaction

b)

phase change

c)

melting point

d)

boiling point

43.

Something is considered a ________ when it is made of one type of material all the way through. An example could be water, chalk, vinegar, or copper.

a)

molecule

b)

chemical

c)

substance

d)

solvent

44.

_________ is when on substance is able to dissolve in another.

a)

phase change

b)

substance

c)

density

d)

solubility

45.

What vocabulary term is being described: Unique characteristic that helps identify a substance.

a)

matter

b)

substance

c)

property

d)

product

46.

Which of the following could help you identify a mystery substance?

a)

hardness

b)

mass

c)

temperature

d)

volume

47.

Does the amount of a substance affect its properties. Select the BEST answer.

a)

Yes. The more of a substance you have the stronger the properties will be.

b)

No. A property is unique and does not depend on how much of a substance you have.

c)

Yes. The more of a substance you have the higher the density will be.

d)

No. Mass is not a property so the amount doesn't matter.

48.

Which change will produce a chemical reaction/new substance?

a)

Mixing Kool Aid and water

b)

baking brownies

c)

freezing water

d)

boiling gasoline

49.
What is the name of the substances that participate in a chemical reaction?
a)
products
b)
reactants
c)
catalysts
d)
intermediates
50.
Which of the following is NOT evidence that that a chemical reaction has occurred?
a)
produces light/heat
b)
production of a gas
c)
formation of a precipitate
d)
melting
51.
A precipitate is a 
a)
liquid that forms when two solids are reacted
b)
a solid that forms when two liquids are mixed
c)
a gas that forms when vinegar and baking soda react
d)
a change of color in a solution
52.
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
53.
In a chemical reaction, everything to the right of the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
54.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
55.
Which observation(s) might be used as evidence that a chemical reaction occurred?
a)
Color change
b)
Odor change
c)
Properties change
d)
All of the above
56.
Which of the following is an example that includes evidence of a chemical reaction?
a)
A sample of zinc is placed in water and it settles to the bottom
b)
A solid block of ice is heated and it completely melts into a liquid. 
c)
Sugar that is burned gives off an odor and turns brown and then black.
d)
A tomato is placed into a blender and chopped up into smaller pieces.
57.
A student observes some sugar as it is heated and burns. The student concludes that a chemical reaction has occurred. Which of the following observations about the burning sugar provides evidence of a chemical reaction?
a)
Heat is added to the sugar crystals.
b)
The sugar melts and becomes a liquid.
c)
Gas is produced as the sugar turns black.
d)
No evidence of chemical reaction is present.
58.
For an investigation a student poured a blue solution of CuSO4 into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes.
The student inferred that a chemical reaction occurred. What evidence supports this inference?
a)
A dark solid formed on the zinc metal.
b)

The zinc metal remained silver-colored and shiny
c)
The CuSO4 solution turned blue when the zinc metal was added.
d)
None of these
59.
Hydrogen peroxide breaks down to form water and oxygen gas. Which observation is evidence that a chemical reaction has occurred?
a)
The mass of the solution remains the same.
b)
 Phase changes are observed.
c)
 The color of the solution remains clear.
d)
The temperature of the solution increases. 
60.
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
a)
The level of the substance in the beaker is higher after the other liquid is added.
b)
A yellow solid forms and then settles to the bottom of the beaker.
c)
Small white crystals are left behind in the flask that held the first liquid.
61.
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
62.
24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride
a)
62 
b)
38
c)
24
d)
14
63.

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

a)

8

b)

12

c)

24

d)

40

64.
Which equation best represents the law of conservation of mass? 
a)
A
b)
B
c)
C
d)
D
65.
12g of Carbon react with 16g of Oxygen, how much carbon monoxide (CO) is formed? 
a)
28 g
b)
4g
c)
30g
d)
12g

Similar Resources on Wayground

Unit 3 Physics Review

60 questions

Unit 3 Physics Review

quiz

Worksheet

•

7th Grade - University

Symbiotic Relationships

64 questions

Symbiotic Relationships

quiz

Worksheet

•

6th - 8th Grade

Magnets and Circuits Review

70 questions

Magnets and Circuits Review

quiz

Worksheet

•

6th - 8th Grade

Grade 7 Science Final Review!

60 questions

Grade 7 Science Final Review!

quiz

Worksheet

•

7th Grade

PASS Weather Review 2019

64 questions

PASS Weather Review 2019

quiz

Worksheet

•

5th - 7th Grade

HMH 7th Grade Science 1st 9-Wks Exam Study Guide

65 questions

HMH 7th Grade Science 1st 9-Wks Exam Study Guide

quiz

Worksheet

•

7th Grade

Lab Safety

61 questions

Lab Safety

quiz

Worksheet

•

5th - 12th Grade

Science Review

60 questions

Science Review

quiz

Worksheet

•

4th - 8th Grade