Question 1

What does the Law of Conservation of Mass state?

Accepted Answer

Mass cannot be created or destroyed in a chemical reaction

Answer

Mass can be created in a chemical reaction

Answer

Mass can change form but not amount

Answer

Mass can be destroyed in a chemical reaction

Question 2

In a closed system, if 10 grams of reactants are used in a chemical reaction, how much mass should the products weigh?

Accepted Answer

10 grams

Answer

15 grams

Answer

5 grams

Answer

20 grams

Question 3

Which of the following is an example of the Law of Conservation of Mass?

Accepted Answer

Burning wood in a fireplace produces ash and gases, but the total mass remains the same

Answer

A candle burning and disappearing completely

Answer

Water evaporating and leaving no trace

Answer

Iron rusting and losing weight

Question 4

What happens to the mass of substances during a chemical reaction according to the Law of Conservation of Mass?

Accepted Answer

The total mass of the reactants equals the total mass of the products

Answer

The total mass increases

Answer

The total mass decreases

Answer

The total mass becomes unmeasurable

Question 5

Which statement best describes what occurs in a chemical reaction in terms of mass?

Accepted Answer

The mass of the reactants equals the mass of the products

Answer

Mass is lost during the reaction

Answer

The mass of the reactants turns into energy

Answer

The mass of the products is greater than the mass of the reactants

Question 6

Which scenario illustrates the Law of Conservation of Mass?

Accepted Answer

Mixing vinegar and baking soda produces carbon dioxide gas, but the total mass before and after the reaction stays the same

Answer

Dissolving sugar in water where the sugar seems to vanish

Answer

Boiling water resulting in steam that disappears

Answer

Burning paper, which results in ash that weighs less than the original paper

Question 7

What does the Law of Conservation of Mass imply about the products of a chemical reaction?

Accepted Answer

The mass of the products will always equal the mass of the reactants

Answer

The products have no mass

Answer

The products will weigh more than the reactants

Answer

The products will weigh less than the reactants

Question 8

If 20 grams of hydrogen reacts with 16 grams of oxygen to form water, what will be the total mass of the water produced?

Accepted Answer

36 grams

Answer

16 grams

Answer

4 grams

Answer

20 grams

Question 9

When you combine water and salt, which of the following statements is true according to the Law of Conservation of Mass?

Accepted Answer

The total mass of the water and salt mixture is equal to the sum of the masses of water and salt before mixing

Answer

Salt disappears into the water

Answer

The mass decreases after mixing

Answer

Water evaporates and reduces total mass

Question 10

How does the Law of Conservation of Mass apply to a closed vessel during a chemical reaction?

Accepted Answer

The mass inside the closed vessel remains constant

Answer

Mass inside the vessel decreases over time

Answer

Mass can escape from the vessel

Answer

Mass is converted to energy

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