Law of conservation of mass (Revision)

Front

Law of Conservation of Mass

Back

Matter cannot be created nor destroyed

Front

Bob puts 200 g of ice into a pitcher with 900 g of water. How many grams of water does Bob now have in the pitcher after the ice melts?

Back

1100 g

Front

When calcium carbonate is heated, it forms calcium oxide and carbon dioxide. What happens to the mass of the products if 100 g of calcium carbonate is heated?

Back

The sum of the products’ masses equals the mass of the calcium carbonate

Front

32 g of oxygen completely reacts with 8 g of hydrogen to produce ___ g water

Back

40

Front

Explain what happened when a reaction in an open container produced a gas, with reactants weighing 20 g and the product weighing 18 g.

Back

The gas that was produced was not able to be weighed since the container was open.

Front

5 g of magnesium was added to 20 g of hydrochloric acid in an open vessel. If 19.6 g of solution remained, how much hydrogen gas was produced?

Back

0.4 g

Front

A student mixes 125 grams of sugar, 250 grams of water and 5 grams of flavoring. The solution weighs...

Back

380 grams

Front

If reaction starts with 20g of reactants, what is the total mass of products produced?

Back

a total of 20g of products

Front

What will weigh more when a chemical change is complete? The reactants before the chemical reaction, or the product after the reaction is complete?

Back

They both will weigh the same

Front

According to the Law of Conservation of Mass, what happens to the wood and oxygen when it is burned?

Back

The atoms in the wood and oxygen rearrange and form smoke and ash.