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

Test Balancing Equations

Authored by Charles Martinez

Chemistry

KG - University

NGSS covered

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34 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Solve the problem: Al + S --> Al2S3

Al + 2S --> 2Al2S3

2Al + 3S --> Al2S3

Tags

NGSS.HS-PS1-7

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

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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

Yes

Tags

NGSS.HS-PS1-7

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.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is a product?

What's left of the chemical reaction.

The beginning formulas.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Mg + ___ HCl → MgCl₂ + H₂

Tags

NGSS.HS-PS1-7

MULTIPLE CHOICE QUESTION

1 min • 1 pt

PCl₅ + _ H₂O → _ HCl + H₃PO₄

4, 5

1, 6

3, 8

2,2

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

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Test Balancing Equations

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

Mg + ___ HCl → MgCl₂ + H₂

PCl₅ + _ H₂O → _ HCl + H₃PO₄

PCl₅ + _ H₂O → _ HCl + H₃PO₄