Law of Conservation of Matter

Multiple Choice

If 20g of sugar is stirred into a beaker containing 100g of water. What would the mass of the dissolved solution be after the sugar is dissolved fully?

• 20g

• 100g

• 80g

• 120g

Multiple Choice

Suppose you have 15g of baking soda and mix it with 15g of vinegar. When they are combined they bubble and fizz a lot. The final solution has a mass of 25g. What happened to the "lost" 5g?

• it dissappears

• it is still there just not weighted

• it is in the gas that is formed

• nothing happened

Multiple Choice

Balance this equation:

MgCl₂ --> Mg₄ + Cl₂

• It's already balanced.

• 4 MgCl₂ --> Mg₄ + 4 Cl₂

• 4 MgCl₂ --> Mg₄ + 5 Cl₂

Multiple Choice

How many atoms of aluminum are on each side of the following equation?

4Al + 3O₂ --> 2Al₂ O₃

• 2

• 6

• 4

• 1