5.P.2.2 Law of Conservation of Mass

Anthony is performing an experiment. He adds 2 grams of baking soda to 5 grams of water and stirs. Anthony watches as the baking soda dissolves in the water. If Anthony weighs the water and baking soda solution, what will its mass be?

• 2 grams

• 5 grams

• 7 grams

• 3 grams

If 10 grams of water are added to 5 grams of salt, how much salt water will be made?

• 2 grams
• 5 grams
• 10 grams
• 15 grams

A rock weighing 60 g is broken into 2 pieces. What are possible weights for the two pieces of rock?

• 20 g and 20 g
• 30 g and 20 g
• 30 g and 30 g
• 45 g and 10 g

Jackie creates a piece of artwork by melting crayons and mixing the colors together. She uses 10 crayons that weighed 20 grams in all. How much do the melted crayons weigh?

• 2 grams

• 20 grams

• 30 grams

• 200 grams

Leslie places 5 pounds of ice in a 1 pound bucket with a lid. The next day, she notices all the ice has melted. When she weighs the bucket with the melted ice, what will itmost likely weigh?

• 4 pounds
• 6 pounds
• 7 pounds
• 5 pounds

Thomas has 1,200 g of salt water. Which could be the correct measures of salt and water before they were mixed?

• 400 g of salt and 800 g of water

• 900 g of salt and 200 g of water

• 1,200 g of salt and 1,200 g of water

• 700 g of salt and 5,000 g of water

Maria fills a bowl with 200 g of water. She puts the bowl of water in the freezer, and the water freezes. Which will most likely be the mass of the frozen water?

• 50 g
• 100 g
• 200 g
• 400 g

Anything that has mass & takes up space

• gravity
• force
• matter
• volume

A student notices an inflated balloon gets larger when it is warmed by a lamp. Which best describes the mass of the balloon as a result of this change?

• The mass of the balloon increases because the size of the balloon increased.

• The mass of the balloon increases because the temperature of the balloon has increased.

• The mass of the balloon stays the same because the gas inside the balloon still has the same mass after it warms up.

• The mass of the balloon stays the same because warming decreases the mass enough to cancel out the effect of increasing in size.

A jeweler melts gold to make jewelry. As the gold melts, the mass

• increases

• stays the same

• decreases