Conservation of Mass

Peter and Ava mixed together 15.00g of hot chocolate mix with 32.00g of milk. The students stirred the mixture until it dissolved and then measured the mass of the mixture. The reading on the balance was

• 32.00g

• 47.00g

• 17.00g

• 0.52g

Tags

NGSS.MS-PS1-5

Harry bought a container of vanilla ice cream. He noticed that the label on the outside said that there was 510g of ice cream in the container. Unfortunately Harry forgot to put the ice cream in the freezer and it melted. What is the mass of the ice cream now?

• 51g

• 500g

• 10g

• 510g

Rosie measured the mass of a cup of water. The mass was 67g. She left the container by the window. When she looked at the water again it looked like some of the water has disappeared. She measured the mass again. This time it was 41g. What is a possible explanation?

• The water froze into a solid and the mass changed

• 26g of water evaporated to water vapor gas and so the mass of the cup decreased

• 41g of water evaporated to water vapor gas and so the mass of the cup decreased

• 21g of water evaporated to water vapor gas and so the mass of the cup decreased

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Students carried out an experiment to measure the mass of sugar and water before and after mixing. The results are shown below. Choose the correct missing results.

• sugar only 22g, water only 17g, water and sugar only 45g

• sugar only 8g, water only 16g, water and sugar only 31g

• sugar only 5g, water only 14g, water and sugar only 27g

• sugar only 6g, water only 17g, water and sugar only 23g

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

When 10g of salt is added to 100g of water, the mixture weighs 110g. Choose the correct explanation

• The mixture contained the same number of particles as the individual salt and water added together, so the mass stayed the same

• Some new particles appeared in the mixture, so the mass stayed the same

• Some particles disappeared from the mixture, so the mass stayed the same

• The salt disappeared, so the mass stayed the same

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2