In any chemical reaction, the mass of the products is always:

the same as the mass of the reactants

slightly less than the mass of the reactants

much less than the mass of the reactants

greater than the mass of the reactants

Students react baking soda & vinegar. Which of the following would provide the evidence that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction?

The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.

Bubbles were produced during the reaction, which meant that a gas was being produced.

The plastic bag did not change in any way, indicating that it was not involved in the reaction.

The mass of the baking soda was exactly equal to the mass of the vinegar used to create the chemical reaction.

Which of the following is true of the law of conservation of mass?

The same number and type of each atom will always be present before and after a chemical reaction takes place.

Some of the atoms present before the reaction will always be lost during a chemical reaction.

Some of the atoms will always be changed into a different type of atom by a chemical reaction.

During a chemical reaction, atoms will always be combined into much larger molecules.

What is the law of conservation of matter? Best Answer

Nothing can be created or destroyed and conservation means the same.

A set of rules that you have to follow to conserve matter

What is wrong with this chemical formula? Na 3 O 2 + O H --> OH +ONa 3

There is an extra Na in the product

conservation of mass

Quiz

•

Chemistry

•

7th - 8th Grade

•

Practice Problem

•

Medium

•

NGSS

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

Standards-aligned

Anonymous Anonymous

Used 205+ times

FREE Resource

31 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Fill in the blank:
The law of conservation of mass states that matter cannot be created nor __________________.

destroyed

rearranged

transferred

changed

Tags

NGSS.MS-PS1-5

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Fill in the blank:
A __________________ chemical equation shows that the same number of atoms in the reactants are also in the product.

balanced

transferred

rearranged

beautiful

Tags

NGSS.MS-PS1-5

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In a closed system, a chemical reaction takes place. The mass of the reactants in the beginning of the reaction is 25g. What does the mass have to be in the end of the reaction in order to follow the law of conservation of mass?

25g

You can't tell with the given information.

30g

15g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a chemical reaction, the mass of the reactants was 15g. The mass of the products was 12g. Did this chemical reaction follow the law of conservation of mass?

Yes

No

You can't tell with the given infomation

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The following chemical reaction occurs:
2S + 3O₂ -> 2SO₃_{How many atoms of oxygen are there in the reactant?}

2 atoms of oxygen

3 atoms of oxygen

6 atoms of oxygen

1 atom of oxygen

Tags

NGSS.MS-PS1-1

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The following chemical reaction occurs:
N₂+ 3 H_{2 ->}2NH₃How many atoms of hydrogen are there in the product?

3 atoms of hydrogen

2 atoms of hydrogen

6 atoms of hydrogen

1 atom of hydrogen

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The following chemical equation occurs:
CH₄+ 2O₂-> CO₂+ 2H₂O
Does this equation follow the law of conservation of mass? In other words, are there the same number of carbon, hydrogen, and oxygen atoms in the reactants and the products?

Yes

No

You can't tell with the given information

Tags

NGSS.MS-PS1-5

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conservation of mass

31 questions

Fill in the blank:
The law of conservation of mass states that matter cannot be created nor __________________.

Fill in the blank:
A __________________ chemical equation shows that the same number of atoms in the reactants are also in the product.

In a closed system, a chemical reaction takes place. The mass of the reactants in the beginning of the reaction is 25g. What does the mass have to be in the end of the reaction in order to follow the law of conservation of mass?

In a chemical reaction, the mass of the reactants was 15g. The mass of the products was 12g. Did this chemical reaction follow the law of conservation of mass?

The following chemical reaction occurs:
2S + 3O₂ -> 2SO₃_{How many atoms of oxygen are there in the reactant?}

The following chemical reaction occurs:
N₂+ 3 H_{2 ->}2NH₃How many atoms of hydrogen are there in the product?

The following chemical equation occurs:
CH₄+ 2O₂-> CO₂+ 2H₂O
Does this equation follow the law of conservation of mass? In other words, are there the same number of carbon, hydrogen, and oxygen atoms in the reactants and the products?

There are two reactants in a chemical equation, and one product. The mass of the product is 30g. The mass of the first reactant is 17g. What must the mass of the second reactant be, if the equation is to follow the law of conservation of mass?

If reaction starts with 20g of reactants it should produce

Which are the reactants in the following reaction?
2Mg + O₂ ---> 2MgO

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Discover more resources for Chemistry

conservation of mass

31 questions

Fill in the blank:The law of conservation of mass states that matter cannot be created nor __________________.

Fill in the blank:A __________________ chemical equation shows that the same number of atoms in the reactants are also in the product.

In a closed system, a chemical reaction takes place. The mass of the reactants in the beginning of the reaction is 25g. What does the mass have to be in the end of the reaction in order to follow the law of conservation of mass?

In a chemical reaction, the mass of the reactants was 15g. The mass of the products was 12g. Did this chemical reaction follow the law of conservation of mass?

The following chemical reaction occurs:2S + 3O2 -> 2SO3How many atoms of oxygen are there in the reactant?

The following chemical reaction occurs:N2 + 3 H2 -> 2 NH3How many atoms of hydrogen are there in the product?

The following chemical equation occurs:CH4 + 2O2 -> CO2 + 2H2ODoes this equation follow the law of conservation of mass? In other words, are there the same number of carbon, hydrogen, and oxygen atoms in the reactants and the products?

There are two reactants in a chemical equation, and one product. The mass of the product is 30g. The mass of the first reactant is 17g. What must the mass of the second reactant be, if the equation is to follow the law of conservation of mass?

If reaction starts with 20g of reactants it should produce

Which are the reactants in the following reaction?2Mg + O2 ---> 2MgO

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Chemistry

Fill in the blank:
The law of conservation of mass states that matter cannot be created nor __________________.

Fill in the blank:
A __________________ chemical equation shows that the same number of atoms in the reactants are also in the product.

The following chemical reaction occurs:
2S + 3O₂ -> 2SO₃_{How many atoms of oxygen are there in the reactant?}

The following chemical reaction occurs:
N₂+ 3 H_{2 ->}2NH₃How many atoms of hydrogen are there in the product?

The following chemical equation occurs:
CH₄+ 2O₂-> CO₂+ 2H₂O
Does this equation follow the law of conservation of mass? In other words, are there the same number of carbon, hydrogen, and oxygen atoms in the reactants and the products?

Which are the reactants in the following reaction?
2Mg + O₂ ---> 2MgO