Intro to Chemical Reactions

The Law of Conservation of Mass states Matter is NEITHER created nor destroyed.

• True

• False

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

If a reaction starts with a total 75g of reactants it should produce 

• a total of 40g of products
• a total of 75g of products
• a total of 180 g of products
• None of the above

Tags

NGSS.MS-PS1-5

24 g of magnesium reacts with 38 g of fluorine to produce _____ g magnesium fluoride

• 62 
• 38
• 24
• 14

Tags

NGSS.MS-PS1-5

Select all indicators of a chemical reaction.

You have a sugar cube that you crush into a powder. After you crush it, you drop it into a mystery liquid that then turns the sugar black. After a few seconds, smoke comes off of the mixture and you notice that the beaker is hot.

• Unexpected color change

• Gas Evolution

• Change in Energy

• Precipitate Formation

• Water Production

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Select all indicators of a chemical reaction.

You are at a bonfire and you bring out some marshmallows! You put one on a stick and put it over the fire. You start to see the marshmallows turn black. You also smell a sweet, burnt smell.

• Unexpected color change

• Gas evolution

• Change in energy

• Precipitation Formation

• Water production

Tags

NGSS.MS-PS1-2

Select all indicators of a chemical reaction.

You are at a hibachi restaurant! You notice that the chef takes rubbing alcohol and sets it on fire on the grill. You feel the heat and light from the fire on your face. You notice after the fire goes out that there is a clear liquid left on the grill that won’t light on fire again.

• Unexpected color change

• Gas evolution

• Change in energy

• Precipitation Formation

• Water production

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Select all indicators of a chemical reaction.

You are doing a lab! You take two clear chemicals and mix them together. The liquid in the beaker turns bright blue. After letting it sit, you notice that there are blue chunks falling to the bottom of the beaker. You also notice the beaker got really cold.

• Unexpected color change

• Gas evolution

• Change in energy

• Precipitation Formation

• Water production

Tags

NGSS.MS-PS1-2

Select all indicators of a chemical reaction.

Oh no! You are cleaning your house and accidentally mix bleach and clear windex in one spray bottle. You notice that a yellow gas is forming at the top of the bottle. The smell is really gross, so you throw it outside.

• Unexpected color change

• Gas evolution

• Change in energy

• Precipitation Formation

• Water production

Tags

NGSS.MS-PS1-2

Select all indicators of a chemical reaction.

You take two clear chemicals and mix them together. The solution turns a gross brown color. After awhile, you put a third clear chemical in and the solution now turns deep purple. You notice that after you added the third chemical, you see some solid pieces floating in the container.

• Unexpected color change

• Gas evolution

• Change in energy

• Precipitation Formation

• Water production

Tags

NGSS.MS-PS1-2

Select all indicators of a chemical reaction.

You are watching Mr. Chaney light stuff on fire (again). He pours rubbing alcohol on the table, and once it has finished burning, there is a puddle on the table. He tries to light it on fire again, but it won’t, so he adds a piece of metal to the puddle that reacts and creates bubbles in the puddle and smoke comes off of the metal.

• Unexpected color change

• Gas evolution

• Change in energy

• Precipitation Formation

• Water production

Tags

NGSS.MS-PS1-2