Law of Conservation of Mass

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

• increases
• decreases
• is destroyed 
• stays the same

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-4

An ice cube melts and then evaporates. The ice cube and the water vapor have the same

• density
• mass
• temperature
• volume

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

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 student wanted to make a salad.  The student weighed each vegetable before cutting and placing it in the salad.  Which best describes the weight of the salad compared to the total weight of the vegetables?

• The total weight of the vegetables will be the same as the weight of the salad because the vegetables did not lose or gain weight.
• The total weight of the vegetables will be more than the weight of the salad, because cutting the vegetables increased their weight.
• The total weight of the vegetables will be less than the weight of the salad, because the vegetables weigh less when they are cut.
• The weight of the salad will be more than the total weight of the vegetables, because the vegetables were chemically changed.

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 it most likely weigh?

• 4 pounds
• 6 pounds
• 7 pounds
• 8 pounds

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-4

Jasmine bought a 525-gram bag of unfrozen fruit popsicles. Which best describes the mass of the popsicles after they were completely frozen?

• 325 grams
• 425 grams
• 525 grams
• 625 grams

Joe melted two 4-oz sticks of butter. Which best describes the weight of the melted butter?

• 2 oz.
• 4 oz.
• 6 oz.
• 8 oz.

Amanda melted a 4-oz chocolate bar in a pot with a lid. What is most likely true about the weight of the melted chocolate?

• It weighs more than 4 oz.
• It weighs less than 4 oz.
• It weighs exactly 4 oz.
• It weighs double 4 oz.

Tags

NGSS.MS-PS1-5

Ivy mixed 30 g of hot chocolate mix with 200 g of hot milk. She then added 5 marshmallows with a mass of 8 g each. Which best describes the mass of her hot chocolate?

• 243 g
• 200 g
• 30 g
• 270 g

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A rock weighing 50 g is broken into 2 pieces. What are possible weights for the two pieces of rock?

• 20 g and 20 g
• 20 g and 30 g
• 30 g and 30 g
• 25 g and 35 g