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Chemical Reaction Word Problems

Authored by Lisa Thompson

Science

7th Grade

NGSS covered

Chemical Reaction Word Problems
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15 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

You have 2 chemicals, CHEMICAL A and CHEMICAL B. They are both liquids. When you combine them you notice some crystals starting to form within them. Did a chemical reaction occur?

Yes

No

Tags

NGSS.MS-PS1-2

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

This is the decomposition reaction of hydrogen peroxide. According to the law of conservation of mass, if you start with 40g of hydrogen peroxide you should end up with _____g of water and oxygen combined.

10

20

30

40

Tags

NGSS.MS-PS1-5

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

You have a solution of sodium chloride (NaCl) and you add silver nitrate (AgNO3) to it. A white precipitate forms. What is the precipitate?

Silver chloride (AgCl)

Sodium nitrate (NaNO3)

Sodium chloride (NaCl)

Silver nitrate (AgNO3)

Tags

NGSS.MS-PS1-2

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

When vinegar (acetic acid) is mixed with baking soda (sodium bicarbonate), bubbles form. What gas is produced?

Oxygen (O2)

Carbon dioxide (CO2)

Hydrogen (H2)

Nitrogen (N2)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In a chemical reaction, the mass of the reactants is 50 grams. After the reaction, the mass of the products is measured to be 50 grams. What principle does this demonstrate?

Law of Conservation of Mass

Law of Definite Proportions

Law of Multiple Proportions

Law of Conservation of Energy

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A piece of zinc is added to hydrochloric acid, and hydrogen gas is released. What type of reaction is this?

Synthesis

Decomposition

Single replacement

Double replacement

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the product when hydrogen gas reacts with oxygen gas?

Water (H2O)

Hydrogen peroxide (H2O2)

Ozone (O3)

Carbon dioxide (CO2)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

NGSS.MS-PS1-1

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