3.1 Law of Conservation of Mass HW

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of reactants equals the total mass of products.

Front

In a reaction A + B -> C, if A has 5g and C has 9g, how much does B weigh?

Back

4g

Front

If Bob puts 200 grams of ice into 900 grams of water, how much water does he have after the ice melts?

Back

1,100 g

Front

What is an Open System in terms of matter exchange?

Back

An Open System allows matter to flow freely in and out.

Front

If a reaction starts with 75g of reactants, how much should it produce?

Back

75g of products.

Front

If a reaction starts with 20g of reactants, how much should it produce?

Back

20g of products.

Front

What happens to mass in a closed system during a chemical reaction?

Back

The total mass remains constant; it does not change.

Front

What is a Closed System?

Back

A Closed System does not allow matter to enter or leave, but energy can be exchanged.

Front

How do you calculate the mass of a missing reactant in a reaction?

Back

Subtract the mass of known products from the total mass of reactants.

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations ensures that the Law of Conservation of Mass is upheld, showing that mass is conserved.