OSE 7.1 Chemical Reaction Lesson 2

Why do students record the mass of the whole system before and after the reaction?

• To determine if new matter was added or gas was formed

• To see how much water the bath bombs absorbed

• To ensure the bottle cap is tightly on

• To compare the weight of the dry and wet bath bombs

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

What does hearing a hiss when opening the bottle cap indicate?

• Gas escaping from the system

• Water leaking from the bottle

• The bath bombs reacting again

• The bottle cap being too tight

What key idea explains why the mass decreased when the bottle cap was opened?

• Gas is matter and has mass, so when it escapes, mass decreases.

• The water evaporated inside the bottle.

• Bubbles dissolved into the water, causing less mass.

• The bath bombs absorbed more water, decreasing mass

When students hear a hissing sound upon opening the bottle, what conclusion can they draw?

• The gas was part of the closed system, and it escaped when opened.

• The bath bombs are dissolving again.

• Water is leaking from the bottle.

• The bottle cap was not tight enough.

Tags

NGSS.MS-PS1-5

What is a conclusion from crushing the dry bath bomb in a closed bag?

• The bag did not inflate, indicating the gas was not from the dry bath bomb alone.

• The bag inflated quickly, showing the gas came from the bath bomb alone.

• The bag burst open due to the trapped gas.

• The bag remained unchanged, indicating no gas presence.

Tags

NGSS.MS-PS1-2

Which piece of evidence can support the idea that gas is not new matter?

• The mass did not change from before to after mixing the bath bombs with water in a closed bottle.

• The bottle cap makes a hissing sound when removed.

• The bath bomb starts fizzing rapidly when mixed with water.

• The dry bath bomb does not inflate the closed bag.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

How can you tell that gas has mass in the investigation?

• The mass decreases after the cap is removed and gas escapes.

• The water level rises after adding the bath bombs.

• The bubbles make the bottle lighter.

• The fizzing sound is an indication of mass.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

What happens when you open the bottle’s cap after mixing the bath bombs?

• You can hear the hiss of gas escaping.

• The bath bombs re-solidify.

• The water changes color.

• The bottle loses water.

Tags

NGSS.MS-PS1-2

How do the observations of the bag with crushed bath bombs support the claim about gas?

• The bag does not inflate, indicating gas is not trapped inside the bath bomb.

• The bag inflates showing new gas is formed.

• The mass of the bag increases significantly.

• The bag changes color accordingly.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Match the following observations with their implications regarding the claim that the gas is new matter.

• Complete dissolution of the bath bomb.

• The bath bomb dissolves completely.

• Observation that refutes the claim that the gas is new matter.

• The water in the bottle becomes cloudy.

• Change in water appearance.

• The mass of the closed system does not increase after adding the bath bombs.

• Sound indicating gas release.

• The bottle makes a hissing sound when the cap is removed.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2