Does this follow the law of conservation of mass?

No, because there are not the same number of atoms.

Yes, because there are the same number of atoms.

Yes, because there are not the same number of atoms.

No, because there are the same number of atoms.

This chemical equation represents what happens when a nail rusts: 4Fe + 3O 2 –› 2Fe 2 O 3 . The total mass after the reaction is

exactly the same as before the reaction.

not considered before the reaction.

5 times less than before the reaction.

about twice as much as before the reaction.

Which of the following best describes the mass of the iron oxide that is produced during a chemical reaction when a fixed amount of iron combines completely with a fixed amount of oxygen?

equal to the mass of the iron plus the mass of the oxygen

greater than the combined mass of the iron and the oxygen

equal to the mass of the iron minus the mass of the oxygen

less than the mass of the iron but greater than the mass of the oxygen

Suppose 20 g of liquid hydrogen peroxide is heated so it completely breaks down into liquid water and oxygen gas. Which best describes the total mass of the water and oxygen that was produced?

20 g because no matter is added or removed

more than 20 g because of the addition of heat

more than 20 g because there are now two substances

less than 20 g because oxygen gas is very light

Which of the following equations is balanced?

C 2 H 4 + 3O 2 --> 2CO 2 + 2H 2 O

2C 2 H 4 + 2O 2 --> CO 2 + 3H 2 O

2C 2 H 4 + 3O 2 --> 2CO 2 + 3H 2 O

When acetic acid and baking soda are mixed together, carbon dioxide, water, and sodium acetate are formed. What are the products of this reaction?

carbon dioxide, water, and sodium acetate

When acetic acid and baking soda are mixed together, carbon dioxide, water, and sodium acetate are formed. What are the reactants of this reaction?

carbon dioxide, water, and sodium acetate

Evaluate this equation. What is the problem? 4Al + O 2 → 2Al 2 O 3

There are four missing oxygen atoms in the reactants.

There is one missing oxygen atom in the reactants.

There are two missing oxygen atoms in the reactants.

There is an extra aluminum atom in the product.

Evaluate this equation. What is the problem? H 2 + O 2 → 2H 2 O

There are two missing hydrogen atoms in the reactants.

There is one missing oxygen atom in the reactants.

There are two missing oxygen atoms in the reactants.

There is an extra hydrogen atom in the reactants.

Counting atoms, Balancing, Law of Conservation of Mass Review

8th Grade

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32 Qs

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Counting atoms, Balancing, Law of Conservation of Mass Review

Quiz

•

Chemistry

•

8th Grade

•

Practice Problem

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Medium

•

NGSS

MS-PS1-5, MS-PS1-2, MS-PS1-1

Standards-aligned

Kristen Koester

Used 180+ times

FREE Resource

32 questions

Show all answers

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How many Hydrogen atoms are there in 3H₂O?

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In CO₂, how many Carbon's are there?

infinite solution

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In H₂O + CO₂ + O₂, how many O's are there?

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In the compound 4Mg(OH)₂, how many Hydrogen's are there?

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In NH₃, how many Nitrogen's are there?

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Does this equation follow the law of conservation of mass?

Yes

Sometimes

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

According to the law of conservation of mass, which statement is true?

The atoms of the reactants and products are different

The atoms of the reactants and products are equal

The subscripts must be the same

The compounds must be the same

Tags

NGSS.MS-PS1-5

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Counting atoms, Balancing, Law of Conservation of Mass Review

32 questions

How many Hydrogen atoms are there in 3H₂O?

In CO₂, how many Carbon's are there?

In H₂O + CO₂ + O₂, how many O's are there?

In the compound 4Mg(OH)₂, how many Hydrogen's are there?

In NH₃, how many Nitrogen's are there?

Does this equation follow the law of conservation of mass?

According to the law of conservation of mass, which statement is true?

Salt is combined with water to make salt water. What are the reactants?

Salt is combined with water to make salt water. What are the products?

How many grams of products should there be?

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Popular Resources on Wayground

Discover more resources for Chemistry

Counting atoms, Balancing, Law of Conservation of Mass Review

32 questions

How many Hydrogen atoms are there in 3H2O?

In CO2, how many Carbon's are there?

In H2O + CO2 + O2, how many O's are there?

In the compound 4Mg(OH)2, how many Hydrogen's are there?

In NH3, how many Nitrogen's are there?

Does this equation follow the law of conservation of mass?

According to the law of conservation of mass, which statement is true?

Salt is combined with water to make salt water. What are the reactants?

Salt is combined with water to make salt water. What are the products?

How many grams of products should there be?

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Chemistry

How many Hydrogen atoms are there in 3H₂O?

In CO₂, how many Carbon's are there?

In H₂O + CO₂ + O₂, how many O's are there?

In the compound 4Mg(OH)₂, how many Hydrogen's are there?

In NH₃, how many Nitrogen's are there?