Law of Conservation of Mass

Anthony is performing an experiment. He adds 0.25 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?

• 4.75 grams
• 5.0 grams
• 5.25 grams
• 7.5 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 5 grams each. What is most likely the weight of her artwork?

• 4 grams
• 20 grams
• 50 grams
• 100 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 are the correct measures of salt and water before they were mixed?

• 600 g of salt and 600 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

A student notices that 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 has 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 the size.