Question

questions on law of conservation of mass

Answer 1

the law of conservation of mass states that the mass is neither be created nor be destroy but it can transfer from one form to another form

Answer 2

Which of the following statements best defines the law of conservation of mass?

Mass cannot be created but it can be destroyed under extreme pressures.

Mass cannot be conserved during a chemical reaction; a little bit of mass is always lost.

The mass of a closed system cannot change over time; mass cannot be created nor destroyed.

When added to a system, energy can destroy mass.

1. In a chemical reaction, 300 grams of reactant A are combined with 100 grams of reactant B. Both A and B react to completion. How much will the product weigh?

200 grams

400 grams

300 grams

It cannot be determined from the given information.

2. In a reaction, 25 grams of reactant AB breaks down into 10 grams of product A and an unknown amount of product B. Using the law of conservation of mass, how much does product B weigh?

25 g

10 g

15 g

It cannot be determined from the given information.