Quiz about The Law of Conservation of Mass

Question 1

In the chemical formula $$C_{12}H_{22}O_{11}$$ , how many elements are there?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 2

In the chemical formula $$C_{12}H_{22}O_{11}$$ , how many C atoms are there?

Accepted Answer

12

Answer

22

Answer

11

Answer

45

Question 3

In the chemical formula $$C_{12}H_{22}O_{11}$$ , how many O atoms are there?

Accepted Answer

11

Answer

12

Answer

22

Answer

45

Question 4

In the chemical formula $$C_{12}H_{22}O_{11}$$ , how many H atoms are there?

Accepted Answer

22

Answer

12

Answer

11

Answer

45

Question 5

What is the TOTAL number of atoms in the chemical formula $$C_{12}H_{22}O_{11}$$ ?

Accepted Answer

45

Answer

12

Answer

22

Answer

11

Question 6

Which of the following substances CANNOT be broken down into simpler substance? ?

Accepted Answer

$$Na$$

Answer

$$H_2O$$

Answer

$$C_6H_{12}O_6$$

Answer

$$CO$$

Question 7

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

Accepted Answer

During a chemical reaction, the total amount of matter stays the same.

Answer

During a chemical reaction, matter is destroyed.

Answer

During a chemical reaction, the total number of atoms increases.

Answer

During a chemical reaction, one or more new substances are formed.

Question 8

What happens to the total mass of the substances after a chemical reaction?

Accepted Answer

It remains the same.

Answer

It decreases.

Answer

It increases.

Answer

It increases then decreases.

Question 9

In a chemical reaction, the number of atoms in the products will always equal which amount?

Accepted Answer

the number of atoms in the reactants

Answer

half of the number of atoms in the reactants

Answer

twice the number of the atoms in the reactants

Answer

thrice the number of the atoms in the reactants

Question 10

Jin bought a heat pack that weighs 15 g. He shook it so it would release heat to warm his hands. The release of heat indicates a chemical reaction took place in a closed system. What would be the mass of the heat pack after the chemical reaction?

Accepted Answer

15 g

Answer

5 g

Answer

10 g

Answer

12 g

Question 11

The chemical formula for baking soda is $$NaHCO_3$$ . How many O atoms does it have?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 12

Matter can not be created nor destroyed: it can only be

Accepted Answer

Transformed, changed

Answer

Destroyed a little bit

Answer

Invisible

Answer

None of the above

Question 13

The number to the lower side of an element is a

Accepted Answer

Subscript

Answer

Superscript

Answer

Coefficient

Answer

Charge

Question 14

The number in front of a compound or element is a

Accepted Answer

Coefficient

Answer

Subscript

Answer

Superscript

Answer

Charge

Question 15

A chemical reaction is balanced when

Accepted Answer

Both sides have the same  number of atoms

Answer

both sides have the same elements

Answer

Same subscripts

Answer

Same coefficients

Question 16

If reaction starts with 20g of reactants it should produce

Accepted Answer

a total of 20g of products

Answer

a total of 40g of products

Answer

a total of 10g of products

Answer

a total of 80 g of products

Question 17

What is the Law of Conservation of mass?

Accepted Answer

Mass is never created or destroyed

Answer

Mass is created in a chemical reaction

Answer

Mass is created in a physical change

Answer

New chemicals formed from a chemical reaction have a larger overall mass than the original reactants

Question 18

Maria fills a bowl with 200 g of water. She puts the bowl of water in the freezer, and the water freezes. Which will most likely be the mass of the frozen water?

Accepted Answer

200 g

Answer

50 g

Answer

100 g

Answer

400 g

Question 19

How many atoms do you have in the compound 2MgCl₂?

Accepted Answer

6 atoms

Answer

2 atoms

Answer

4 atoms

Answer

8 atoms

Question 20

How many Ca (Calcium) atoms are found in Ca(OH)_2?

Accepted Answer

1 atom

Answer

5 atoms

Answer

3 atoms

Answer

2 atoms

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