Chemical Reactions and Mass Conservation

Chemical Reactions and Mass Conservation

Assessment

Interactive Video

Chemistry, Science

6th - 9th Grade

Hard

Created by

Jackson Turner

FREE Resource

The video tutorial explains the Law of Conservation of Mass, stating that mass cannot be created or destroyed in a chemical reaction. It uses examples involving hydrogen and oxygen to demonstrate that the total mass of reactants equals the total mass of products. The tutorial further explains that the number of atoms remains constant before and after a reaction, reinforcing the concept of mass conservation. The lecture concludes by summarizing the key points and reiterating the law's definition.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is formed when hydrogen and oxygen chemically combine?

Carbon dioxide

Water

Methane

Hydrogen peroxide

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many grams of water are produced when 2 grams of hydrogen react with 16 grams of oxygen?

18 grams

22 grams

16 grams

20 grams

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

According to the law of conservation of mass, what happens to mass during a chemical reaction?

It is created

It is destroyed

It doubles

It remains constant

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is no new mass created in a chemical reaction?

Because atoms disappear

Because atoms are destroyed

Because atoms are created

Because atoms rearrange

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the total mass of reactants in the given example of hydrogen and oxygen?

16 grams

22 grams

18 grams

20 grams

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many molecules of water are formed from 4 atoms of hydrogen and 2 atoms of oxygen?

3 molecules

4 molecules

2 molecules

1 molecule

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What remains constant in a chemical reaction according to the lecture?

Number of protons

Number of electrons

Number of molecules

Number of atoms

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