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balancing chemical equations

Last updated about 2 years ago

6 questions

Instructions

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Question 1

1.

Why is it important to balance chemical equations?

To make the equations look uniform

To satisfy the Law of Conservation of Mass

To make the equations easier to solve

To satisfy the Law of Conservation of Energy

Question 2

2.

Which of these reactions are correctly balanced?

CH4 + 2O2 -> 2H2O + CO2

2H2O -> 2H2 + O2

H2 + O2 -> H2O

2H2 + O2 -> 2H2O

Question 3

3.

What is the balance of this chemical equation? H2 + O2 -> H2O

Question 4

4.

The balancing of a chemical equation involves only changing the coefficients (numbers before elements/compounds), not the subscripts.

True

False

Question 5

5.

It is possible to balance a chemical equation by changing the chemical symbols of the elements involved.

True

False

Question 6

6.

The principle of conservation of mass states that no atoms are lost or created during a chemical reaction, hence they must be balanced on both sides of a chemical equation.

True

False