Question

the law of conservation of mass says that matter *
can not be created or destroyed.
must change to a different state.
will equal the amount of matter left in the container the experiment occurred in.
will only happen if heat is applied.

bob puts 200 grams of ice into a pitcher with 900 grams of water. he gets distracted and comes back later to find that the ice has melted in the water. how many grams of water does bob now have in the pitcher?
900 grams
200 grams
700 grams
1100 grams

Explanation:

The Law of Conservation of Mass states that matter is neither created nor destroyed in a chemical or physical change. For the first question, this is the key concept. For the second question, when the ice melts, the total mass of water in the pitcher is the sum of the initial mass of water and the mass of ice which has now become water, following the law of conservation of mass.

Answer:

1. A. can not be created or destroyed.
2. D. 1100 grams