Question 1

In the balanced chemical equation 2H2 + O2 -> 2H2O, how many oxygen atoms are present in the products?

Accepted Answer

2

Answer

4

Answer

1

Answer

0

Question 2

In the balanced chemical equation 4NH3 + 5O2 -> 4NO + 6H2O, how many oxygen atoms are present in the reactants?

Accepted Answer

10

Answer

8

Answer

5

Answer

6

Question 3

In the balanced chemical equation 2Al + 3Cl2 -> 2AlCl3, how many chlorine atoms are present in the products?

Accepted Answer

6

Answer

2

Answer

4

Answer

3

Question 4

In the balanced chemical equation 6H2 + 2N2 -> 4NH3, how many nitrogen atoms are present in the products?

Accepted Answer

4

Answer

6

Answer

1

Answer

2

Question 5

In the balanced chemical equation 5C4H10 + 13O2 -> 10CO2 + 10H2O, how many carbon atoms are present in the reactants?

Accepted Answer

20

Answer

15

Answer

10

Answer

5

Question 6

In the balanced chemical equation 2K + Br2 -> 2KBr, how many bromine atoms are present in the products?

Accepted Answer

2

Answer

1

Answer

4

Answer

3

Question 7

In the chemical equation 2Na + Cl2 -> 2NaCl, how many chlorine atoms are there in the products?

Accepted Answer

2

Answer

1

Answer

4

Answer

3

Question 8

In the equation 4Fe + 3O2 -> 2Fe2O3, how many iron atoms are present in the reactants?

Accepted Answer

4

Answer

3

Answer

2

Answer

6

Question 9

In the equation 2C4H10 + 13O2 -> 8CO2 + 10H2O, how many carbon atoms are present in the products?

Accepted Answer

8

Answer

6

Answer

10

Answer

4

Question 10

What does the law of conservation of matter state?

Accepted Answer

Matter cannot be created or destroyed in a chemical reaction

Answer

Matter can be destroyed but not created

Answer

Matter can be created during chemical reactions

Answer

Matter can change into energy without any loss

Question 11

Which of the following best illustrates the law of conservation of matter?

Accepted Answer

A chemical reaction where reactants combine to form products with the same total mass

Answer

Burning wood which turns into ash and smoke

Answer

Dissolving sugar in water that completely disappears

Answer

Cooking an egg where the original egg disappears

Question 12

In a closed system, if 50 grams of reactants undergo a chemical reaction, what will be the total mass of the products?

Accepted Answer

50 grams

Answer

100 grams

Answer

25 grams

Answer

75 grams

Question 13

If a sealed bag of popcorn is heated and pops, what happens to the total mass of the popcorn and the gas released?

Accepted Answer

The total mass remains the same before and after popping

Answer

The mass decreases because it turns into steam

Answer

The mass becomes unpredictable after popping

Answer

The mass increases due to added air

Question 14

When hydrogen and oxygen combine to form water, how does this relate to the law of conservation of matter?

Accepted Answer

The total mass of hydrogen and oxygen equals the mass of the water produced

Answer

Some mass is lost when water is formed

Answer

Only hydrogen or oxygen is used up in the process

Answer

Water is formed by creating additional hydrogen and oxygen

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