Conservation of Mass

Front

What does the Law of Conservation of Mass state?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction; it remains constant.

Front

How does heating a gas in a balloon affect its mass?

Back

Heating a gas in a balloon causes the gas to expand, but the mass of the gas remains the same.

Front

What happens to the mass of a substance when it changes state, such as melting?

Back

The mass of a substance remains the same when it changes state, such as from solid to liquid.

Front

In a chemical reaction, if the mass of the reactants is 20 grams, what should be the mass of the products?

Back

The mass of the products should also be 20 grams, according to the Law of Conservation of Mass.

Front

What is the mass of water produced from 4 grams of hydrogen and 32 grams of oxygen?

Back

The mass of water produced is 36 grams.

Front

When wood burns, what happens to its mass?

Back

The mass of the wood stays the same, but it transforms into smoke and ash.

Front

If a reactant has a mass of 12 grams and one product has a mass of 5 grams, how do you find the mass of the other product?

Back

Subtract the mass of the known product from the mass of the reactant: 12g - 5g = 7g.

Front

What is an example of a physical change that does not affect mass?

Back

Melting ice is a physical change that does not affect the mass; the mass remains the same before and after melting.

Front

Why is it important to understand the conservation of mass in chemical reactions?

Back

Understanding the conservation of mass helps predict the amounts of reactants and products involved in chemical reactions.

Front

What is the relationship between reactants and products in a closed system?

Back

In a closed system, the total mass of reactants equals the total mass of products.