Chemical Reactions

Serena mixed two samples together: a gray solid that smells like flowers and a gray solid that smells like bleach. She analyzed the results and found two ending substances. One of the ending substances was a white solid. This ending substance is made up of the repeating group of atoms shown above. Which of the diagrams to the left shows the repeating groups of atoms that make up the samples Serena mixed together?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Tiana is a chemist who is making a chemical to add to swimming pools in order to make the water safer. She mixed two solid substances together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Tiana found two liquid substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?  

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Damian mixed two samples together: a red liquid that smells irritating and a black solid with no smell. He analyzed the results and found two ending substances. One of the ending substances was a yellow solid. This ending substance is made up of the repeating group of atoms shown above. Which of the diagrams to the left shows the repeating groups of atoms that make up the samples Damian mixed together?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

 Santiago is a chemist working to make a new kind of antacid, which is a medicine that helps with stomach pain. He mixed two powdery solid substances together in a sealed container. The diagram above shows the repeating groups of atoms that make up the two starting substances.

After mixing, Santiago found two liquid substances in the sealed container. (Nothing had escaped.) Which of the diagrams to the left shows the repeating groups of atoms that make up the ending substances?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a reactant in a chemical reaction?

• A substance that is produced in the reaction.

• A substance that speeds up the reaction.

• A substance that is consumed in the reaction.

• A substance that remains unchanged in the reaction.

Tags

NGSS.MS-PS1-1

Which of the following is a sign of a chemical reaction?

• Change in color

• Change in shape

• Change in size

• Change in texture

Tags

NGSS.MS-PS1-2

What is the law of conservation of mass?

• Mass can be created and destroyed in a chemical reaction.

• Mass is lost in a chemical reaction.

• Mass is conserved and remains constant in a chemical reaction.

• Mass is doubled in a chemical reaction.

Tags

NGSS.MS-PS1-5

Which of the following is a characteristic of a chemical reaction?

• It involves a change in state

• It involves the formation of new substances

• It is always reversible

• It does not involve energy changes

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is an endothermic reaction?

• A reaction that releases heat.

• A reaction that absorbs heat.

• A reaction that produces light.

• A reaction that produces sound.

Tags

NGSS.HS-PS1-4

Which of the following is an example of a chemical property?

• Boiling point

• Solubility

• Reactivity with acid

• Density