Question 1

Which of the following is not an element?

Accepted Answer

Ammonia(NH₃)

Answer

Potassium(K)

Answer

Carbon(C)

Answer

Gold(Au)

Question 2

Sodium carbonate Na₂CO₃has a total of ............ atoms.

Accepted Answer

six

Question 3

How many elements are present in Sodium carbonate Na₂CO₃?

Accepted Answer

3

Question 4

A coefficient is a number before an element or a compound.

Accepted Answer

true

Answer

false

Question 5

You cannot change a coefficient.

Accepted Answer

false

Answer

true

Question 6

When balancing an equation, always start with 6.

Accepted Answer

false

Answer

true

Question 7

Subscript is a number after an element.

Accepted Answer

true

Answer

false

Question 8

Subscript can be changed.

Accepted Answer

false

Answer

true

Question 9

Count the total number of atoms: 2C₂H₇NO₂(Ammonium acetate)

Accepted Answer

24 atoms

Question 10

Count the total number of elements: 2C₂H₇NO₂(Ammonium acetate)

Accepted Answer

4 elements

Question 11

What are the correct coefficients?

Accepted Answer

1&#44; 1&#44; 1&#44; 1

Answer

1&#44; 2&#44; 4&#44; 1

Answer

4&#44; 2&#44; 1&#44; 1

Answer

1&#44; 2&#44; 1&#44; 2

Question 12

What are the correct coefficients?

Accepted Answer

2&#44; 1&#44; 2

Answer

1&#44; 1&#44; 2

Answer

2&#44; 2&#44; 2

Answer

1&#44; 2&#44; 1

Question 13

Which of the following is true about the reactants in a chemical reaction?

Accepted Answer

It is always located on the left of the equation.

Answer

It contains elements only.

Answer

It is always located on the right of the eqation.

Answer

It contains compounds only.

Question 14

Which of the following statements is incorrect about the subscript of an element?

Accepted Answer

You can always change its value.

Answer

You can never change its value.

Answer

It is the number of atoms of an element

Answer

It is the number after an element.

Question 15

Select the compounds only.

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