What is a chemical equation?

A short way to show a chemical reaction using symbols

A way to explain a chemical reaction using words

The blue numbers in the image below represent ________

I don't know, and don't want to try

none of the answers are correct

The red numbers in the image below represent ________

I don't know, and don't want to try

None of the answers are correct

Why is the following chemical equation not balanced? H 2 + O 2 --> H 2 O

each side of the equation has a different number of oxygen atoms

each side of the equation has a different number of hydrogen atoms

What is a balanced chemical equation?

A chemical equation is balanced when the product or products has the same elements and amount of each element as the reactants had before the reaction occurred

A chemical equation is unbalanced when the product or products don't have the same elements or amount of each element as the reactants had before the reaction occurred

Balancing

Quiz

•

Chemistry

•

KG - University

•

Practice Problem

•

Hard

•

NGSS

HS-PS1-7, MS-PS1-5, MS-PS1-1

+2

Standards-aligned

Charles Martinez

FREE Resource

34 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Solve the problem: Al + S --> Al2S3

Al + 2S --> 2Al2S3

2Al + 3S --> Al2S3

Tags

NGSS.HS-PS1-7

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is a reactant?

The chemical substances that begin the reaction.

What comes from the reaction.

Tags

NGSS.HS-PS1-7

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Is this equation balanced?: CS₂ + 20₂ --> CO₂ +2SO₂

Yes

No

Tags

NGSS.HS-PS1-7

4.

MULTIPLE CHOICE QUESTION

1 min • 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.

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is a product?

What's left of the chemical reaction.

The beginning formulas.

Tags

NGSS.HS-PS1-6

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Mg + ___ HCl → MgCl₂ + H₂

1

2

3

4

Tags

NGSS.HS-PS1-1

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

PCl₅ + _ H₂O → _ HCl + H₃PO₄

4, 5

1, 6

3, 8

2,2

Tags

NGSS.HS-PS1-7

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Balancing

34 questions

Solve the problem: Al + S --> Al2S3

What is a reactant?

Is this equation balanced?: CS2 + 202 --> CO2 +2SO2

What is a coefficient?

What is a product?

Mg + ___ HCl → MgCl2 + H2

PCl5 + ___ H2O → ___ HCl + H3PO4

Is this equation balanced?

Is this equation balanced?

PCl5 + ___ H2O → ___ HCl + H3PO4

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Discover more resources for Chemistry

Is this equation balanced?: CS₂ + 20₂ --> CO₂ +2SO₂

Mg + ___ HCl → MgCl₂ + H₂

PCl₅ + _ H₂O → _ HCl + H₃PO₄

PCl₅ + _ H₂O → _ HCl + H₃PO₄