Sum of Parts and Physical and Chemical Changes

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.

Which is an example of a different substance being formed? 

• glass breaking 
• metal melting
• water freezing 
• wood burning

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. 

A student pours ¼ cup of salt on a scale. The student then puts 3 cups of water in a container on the scale, and records the weight of the salt and the container of water. The student pours the salt into the container of water, and waits for it to dissolve. The student then weighs the salt and water solution. Which of the following best describes the weight of the salt and water mixture compared to the weight of the salt and water before they were mixed?

• The weight of the salt and water mixture will be the same, because the mass of the salt and the mass of the water did not change. 
• The weight of the salt and water mixture will be less, because the salt lost some of its mass when it dissolved. 
• The weight of the salt and water mixture will be more, because the salt molecules will inflate, causing the mass to increase. 
• The weight of the salt and water mixture will be more because the water absorbes the salt, which increases in mass. 

Which example best describes a physical change? 

• baking a pie 
• burning a candle 
• making a paper airplane 

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

Which best describes why deflating the air from a basketball is an example of a physical change? 

• The basketball’s shape is changed. 
• The basketball’s color is changed. 
• The basketball’s size is changed. 

 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? 

• 235 grams
• 238 grams
• 270 grams

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

• 550 g of salt and 650 g of water 
• 900 g of salt and 200 g of water
• 1,200 g of salt and 1,200 g of water