Law of Conservation of Mass

Law of Conservation of Mass

8th Grade

20 Qs

quiz-placeholder

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Law of Conservation of Mass

Law of Conservation of Mass

Assessment

Quiz

Chemistry

8th Grade

Hard

NGSS
MS-PS1-5, MS-PS1-2

Standards-aligned

Created by

Charles Martinez

FREE Resource

20 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is an example of a chemical reaction?
A marshmallow turning black when heated over a fire
A powder dissolving in water to make lemonade
An ice cube melting into a puddle of water
Salt crystals being crushed into a powder

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens when chemical bonds break and new bonds form?
a physical change
a chemical reaction
matter is destroyed
surface area increases

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The principle of conservation of mass is true
only for reactions that take place in open systems.
only for reactions that take place in closed systems.
for reactions in both open and closed systems.
for no reactions at all.

Tags

NGSS.MS-PS1-5

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image
When heated, oxygen reacts with copper to form copper oxide:
If this reaction occurs in a sealed container, will the mass of the container and everything in it increase, decrease, or stay the same and why?
The mass will stay the same because the number of each kind of atom stays the same.
The mass will increase because a new kind of molecule is formed.
The mass will decrease because two substances combine to form one substance.
More information is needed to tell if the mass will change.

Tags

NGSS.MS-PS1-5

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the Law of Conservation of mass?
Mass is created in a chemical reaction
Mass is created in a physical change
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
Mass is never created or destroyed

Tags

NGSS.MS-PS1-5

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams should reactant B have? 
4g
5g
9g
14g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

7.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

A chemical reaction is balanced when
both sides have the same elements
Both sides have the same  number of atoms
Same subscripts
Same coefficients

Tags

NGSS.MS-PS1-5

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