Question 1

What does the Law of Conservation of Mass state during a chemical reaction?

Accepted Answer

Mass is neither created nor destroyed; it is conserved.

Answer

Mass increases as substances combine.

Answer

Mass decreases as substances react.

Answer

Mass varies depending on the temperature.

Question 2

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

Accepted Answer

Burning a piece of wood and measuring the ashes and gases produced.

Answer

Dissolving sugar in water until it disappears.

Answer

Melting ice into water and raising the temperature.

Answer

Evaporating water and collecting the steam.

Question 3

In a closed container, a reaction occurs where 10 grams of reactants are used. What is the expected mass of the products after the reaction?

Accepted Answer

10 grams

Answer

5 grams

Answer

8 grams

Answer

12 grams

Question 4

Which statement best exemplifies a physical change where mass is conserved?

Accepted Answer

Freezing water into ice and measuring its mass before and after.

Answer

Mixing vinegar and baking soda and measuring the foam created.

Answer

Rusting of iron and measuring the mass of the rust.

Answer

Burning paper and measuring the ash produced.

Question 5

When a metal reacts with an acid, producing a gas and a salt, what happens to the total mass?

Accepted Answer

The total mass remains the same before and after the reaction.

Answer

The total mass decreases because gas escapes.

Answer

The total mass increases due to gas production.

Answer

The total mass fluctuates depending on the acid used.

Question 6

Which activity best demonstrates the conservation of mass during a chemical change?

Accepted Answer

Mixing iron filings with sulfur and heating the mixture until it forms iron sulfide.

Answer

Grinding a rock into powder and weighing the powder.

Answer

Freezing orange juice and measuring the ice cubes.

Answer

Dissolving salt in water and measuring the solution.

Question 7

What process can you observe to confirm that mass is conserved during a physical change?

Accepted Answer

Melting chocolate and weighing it before and after it melts.

Answer

Baking bread and measuring the dough.

Answer

Burning wood and weighing the ash left behind.

Answer

Dissolving sand in water and measuring the solution.

Question 8

During a chemical reaction where 20 grams of reactants are combined, what should the mass of the products be?

Accepted Answer

20 grams

Answer

18 grams

Answer

22 grams

Answer

25 grams

Question 9

What happens to the total mass of a closed system when ice melts into water?

Accepted Answer

The total mass remains the same.

Answer

The total mass increases.

Answer

The total mass fluctuates.

Answer

The total mass decreases.

Question 10

Which of the following scenarios best illustrates the Law of Conservation of Mass?

Accepted Answer

A sealed balloon filled with gas has its mass measured before and after heating.

Answer

Sugar dissolves in water and seems to disappear.

Answer

A pot of water is boiled and some water evaporates.

Answer

A metal is rusted and its mass is weighed after.

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