Bath Bomb #2 Quiz

What happens to the mass of the system if gas escapes during the reaction?

• It increases

• It decreases

• It stays the same

• the gas is destroyed

Tags

NGSS.MS-PS1-5

How do properties like density help identify gases?

• Density tests can determine if a gas is heavier or lighter than air.

• Boiling point tests are irrelevant for identifying gases.

• Density only tells us the weight but doesn’t help in identification.

• Density does not help

How does observing the behavior of a flame help in identifying a gas?

• 1. Flame behavior changes the temperature of the gas.

• Flame behavior shows the taste of the gas.

• Flame behavior can indicate if a gas is flammable or extinguishing.

• Flames do not help with gases.

What do you think happens to the mass when gas is produced in a closed system like a balloon?

• The gas is trapped and decreases the mass of the balloon.

• In a closed system, the mass stays the same because the gas produced is trapped inside the balloon.

• In a closed system the mass increases because something NEW was created

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How can we make something new that was not there before?

• By observing the bath bomb without mixing.

• By adding more water to the mixture.

• By mixing solids and liquids without a change.

• By combining different atoms or molecules.

Tags

NGSS.MS-PS1-1

How can molecules of a new substance be formed from the old atoms or molecules we started with?

• Old molecules can be duplicated to form new substances.

• New molecules are formed by adding energy without changing the old atoms or molecules.

• Molecules can be created from nothing without any reactions.

• By rearranging and combining the atoms and molecules differently.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In explaining how new gas forms, what principle is essential?

• New gas particles come from original substances.

• 1. Particles vanish and reappear.

• Gas forms without changing the original state.

• Particles remain the same before and after.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What did scientists find when they ran electricity through water

• Gas bubbles appeared and rose to the surface.

• Water evaporated immediately.

• Water changed color.

• 1. Water turned into solid crystals.

Tags

NGSS.MS-PS1-2

How do models of molecules help to determine an unknown substance formed as a product from a chemical reaction?

• By comparing the atoms in the models to the atoms/molecules in the reactants.

• By comparing the atoms/molecules in the product and be sure there are more atoms than started with.

• By comparing the atoms/molecules in the product and be sure there are less atoms than started with.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

How can you prove whether 2 substances are the same or different?

• By mixing them together.

• By heating them both.

• By comparing their properties.

• By tasting them.

Tags

NGSS.MS-PS1-2