Chemical vs. Physical Change

What happens when Zoe stirs the very hot water with the spoon made from Gallium metal?

• Zoe's hand catches on fire

• The metal melts

• the water boils

• the pot melts

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What kind of change happens when Zoe stirs the very hot water with the spoon made from Gallium metal?

• Mental

• Chemical

• Physical

• Actionable

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What happens when Dr. Jeff puts the gummy candy into a tube containing oxidizer?

• the gummy candy bursts into wind producing currents (new substances).

• the gummy candy bursts into dance producing moves.

• the gummy candy bursts into water producing waves (new substances).

• the gummy candy bursts into flames producing smoke and carbon (new substances).

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What kind of change happens when Dr. Jeff puts the gummy candy into a tube containing oxidizer?

• Chemical

• Physical

• Actionable

• Mental

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What method did the team use to test what type of gas was produced in the reaction between the Mentos and soda?

• Dr. Jeff, Izzy and Zoe used a net to collect some of the gas produced when soda and Mentos were combined.

• Dr. Jeff, Izzy and Zoe used a balloon to collect some of the gas produced when soda and Mentos were combined.

• Dr. Jeff, Izzy and Zoe used a bag to collect some of the gas produced when soda and Mentos were combined.

• Dr. Jeff, Izzy and Zoe used a bowl to collect some of the gas produced when soda and Mentos were combined.

When Zoe pours the carbon dioxide gas onto the candles, why do they go out one by one?

• Someone blows out each candle so it goes out.

• The wax melts down and the candle doesn't have enough oxygen, so it goes out.

• The water flows down the side and the candle doesn't have enough oxygen, so it goes out.

• The carbon dioxide flows down the steps because it is heavier than the air that was there. When the carbon dioxide displaces the air, the candle doesn't have enough oxygen, so it goes out.

What evidence did the team find that the reaction between the Mentos and soda was a physical change?

• the gas produced was carbon dioxide, which is the same gas already used to make the soda fizzy. That means it is not a new substance, making this a physical change.

• the gas produced was oxygen, which is the same gas already used to make the soda fizzy. That means it is not a new substance, making this a physical change.

• the gas produced was carbon dioxide, which is the same gas already used to make the soda fizzy. That means it is not a new substance, making this a chemical change.

• the gas produced was helium, which is the same gas already used to make the soda fizzy. That means it is not a new substance, making this a physical change.

Tags

NGSS.MS-PS1-2

What is a flame test and what can we learn from it?ANSWER

• A flame test is a way to tell different types of chemicals apart.

• A flame test is a way to tell different types of gases apart.

• A flame test is a way to tell different types of areas apart.

• A flame test is a way to tell different types of colors apart.

Explain how the reaction of a flame to carbon dioxide is different from the reaction of a flame to hydrogen in terms of cause and effect.

• Oxygen displaces the oxygen the flame needs to burn, which causes the flame to go out (the effect). When a flame is placed near oxygen, it causes a popping noise (the effect) as the oxygen burns.

• Helium displaces the oxygen the flame needs to burn, which causes the flame to go out (the effect). When a flame is placed near helium, it causes a popping noise (the effect) as the helium burns.

• Propane displaces the oxygen the flame needs to burn, which causes the flame to go out (the effect). When a flame is placed near propane, it causes a popping noise (the effect) as the propane burns.

• Carbon dioxide displaces the oxygen the flame needs to burn, which causes the flame to go out (the effect). When a flame is placed near hydrogen, it causes a popping noise (the effect) as the hydrogen burns.

Tags

NGSS.MS-PS1-2

What is a mixture?

• A mixture contains 1 or substance that is not chemically combined. Mixtures cannot be physically separated into their individual components.

• A mixture contains 5 or more substances that are chemically combined. Mixtures cannot be physically separated into their individual components.

• A mixture contains two or more substances that are not chemically combined. Mixtures can be physically separated into their individual components.

• A mixture contains two or more substances that are chemically combined. Mixtures can be physically separated into their individual components.