Mass before and after

Question 1

100 g of water and 20 g of salt are stirred until the salt dissolves. What is the total mass?

Answer g

Question 2

Rust forms on an iron nail. The rusty nail has MORE mass than the clean nail. Why?

• A. Oxygen from the air joined with the iron.
• B. Rust is always heavier than anything.
• C. The nail grew longer.
• D. Rust is made from nothing.

Question 3

Vinegar and baking soda are mixed inside a sealed plastic bottle on a balance. They fizz and make a gas. The mass before was 268 g. What is the mass after the fizzing stops?

Answer g

Question 4

220 g of water and 55 g of salt are stirred until the salt dissolves. What is the total mass?

Answer g

Question 5

A sealed flask of water is weighed, heated until some water boils into steam, then weighed again with the lid still on. What happens to the mass?

• A. It goes down.
• B. It goes up.
• C. It stays the same.
• D. It becomes zero.

Question 6

Vinegar and baking soda are mixed inside a sealed plastic bottle on a balance. They fizz and make a gas. The mass before was 239 g. What is the mass after the fizzing stops?

Answer g

Question 7

190 g of sand and 25 g of iron filings are mixed together. What is the total mass?

Answer g

Question 8

A burning candle on a balance gets lighter. Has matter been destroyed?

• A. No, the balance is broken.
• B. Yes, the flame eats the wax.
• C. Yes, burning destroys matter.
• D. No, the wax has turned into gases that escaped into the air.

Question 9

Vinegar and baking soda are mixed in an OPEN cup on a balance. They fizz and 4 g of gas escapes into the air. The mass before was 186 g. What does the balance show after the fizzing stops?

Answer g

Question 10

150 g of water and 45 g of salt are stirred until the salt dissolves. What is the total mass?

Answer g

Question 11

A burning candle on a balance gets lighter. Has matter been destroyed?

• A. Yes, burning destroys matter.
• B. No, the balance is broken.
• C. Yes, the flame eats the wax.
• D. No, the wax has turned into gases that escaped into the air.

Question 12

Vinegar and baking soda are mixed in an OPEN cup on a balance. They fizz and 6 g of gas escapes into the air. The mass before was 278 g. What does the balance show after the fizzing stops?

Answer g

Question 13

180 g of water and 15 g of salt are stirred until the salt dissolves. What is the total mass?

Answer g

Question 14

A burning candle on a balance gets lighter. Has matter been destroyed?

• A. Yes, burning destroys matter.
• B. No, the balance is broken.
• C. Yes, the flame eats the wax.
• D. No, the wax has turned into gases that escaped into the air.

Question 15

Vinegar and baking soda are mixed in an OPEN cup on a balance. They fizz and 2 g of gas escapes into the air. The mass before was 278 g. What does the balance show after the fizzing stops?

Answer g

Question 16

175 g of sand and 40 g of iron filings are mixed together. What is the total mass?

Answer g