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Chemical Reactions

Authored by VICKI WEBB

Chemistry

8th Grade

NGSS covered

Used 1+ times

Chemical Reactions
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49 questions

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1.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

In a chemical equation, is it true that

the reactant side and product side can have different numbers of atoms for each element
there can be different elements on the reactant side and the product side
the reactant and product side have the same atoms for each element

Tags

NGSS.MS-PS1-5

2.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What is a coefficient?

The small number on the right of the chemical symbol.
The large number to the left of a formula.

Tags

NGSS.HS-PS1-7

3.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Why must chemical equations be balanced?

So that the equation doesn't explode
The reaction won't happen until it is balanced
Matter cannot be created or destroyed
None of these

Tags

NGSS.HS-PS1-7

4.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

2Ca + O2 --> 2CaO 
What is the 2 located behind oxygen (O) called?

coefficient
reactant
subscript
product

5.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

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

Mg and O2
MgO
Mg and MgO
O2 and MgO

Tags

NGSS.MS-PS1-2

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How many atoms of hydrogen (H), sulfur (S), and oxygen (O) are there in sulfuric acid (H2SO4)?

H-6, S-4, O-4
H-1, S-2, O-8
H-2, S-1, O-4
H-2, S-4, O-4

Tags

NGSS.MS-PS1-1

7.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

Which of the following IS a physical change?

Getting a haircut
Rusty metal
sour milk
A compound

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