Intro Chemical Reactions

A different chemical substance is formed when _____.

• water boils

• metal rusts

• ice melts

• rock is crushed

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Digesting your food is an example of 

• chemical change

• physical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

You are testing unknown gas A with a small flame test. You observe that when gas A is exposed to the flame the flame turns from orange to blue. Using the provided chart, determine which gas is most likely gas A.

• Oxygen

• Methane

• Carbon Dioxide

• Either Carbon Dioxide or Nitrogen

• Not enough information

Tags

NGSS.MS-PS1-2

You are testing unknown gas B with a small flame test. You observe that when gas B is exposed to the flame the flame goes out. Using the provided chart, determine which gas is most likely gas B.

• Oxygen

• Methane

• Carbon Dioxide

• Either Carbon Dioxide or Nitrogen

• Not enough information

Tags

NGSS.MS-PS1-2

You are testing unknown gas C with a small flame test. You observe that when gas C is exposed to the flame the flame burns bright green. Using the provided chart, determine which gas is most likely gas C.

• Oxygen

• Methane

• Carbon Dioxide

• Either Carbon Dioxide or Nitrogen

• Not enough information

Tags

NGSS.MS-PS1-2

Cherylanne mixes together Chemical A and Chemical B in a test tube, forming Chemical C. The mixture instantly turns cool to the touch. She then adds Chemical D, and the reaction becomes hot and explodes.

• Chemicals A and B form an endothermic reaction, and chemicals C and D form an exothermic reaction.

• Chemicals A and B form an exothermic reaction, and chemicals C and D form an endothermic reaction.

• Chemicals A and C form an endothermic reaction, and chemicals B and D form an exothermic reaction.

• Chemicals A and B form an exothermic reaction, and chemicals B and D form an endothermic reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

For a science project, Janet performs four experiments that are supposed to show a chemical reaction. She displays her results in a table. In the column titled "Chemical reaction?," which experiment’s data should be changed to "No”?

• experiment 1

• experiment 2

• experiment 3

• experiment 4

Tags

NGSS.MS-PS1-2

Two chemicals react in an endothermic reaction. What can be known about this reaction?

• The new substance will need more energy to form its chemical bonds than the old substance will release.

• More energy will be released from the old substance than the new substance will need to form its chemical bonds.

• A precipitate will form as a result of the reaction.

• A gas will form as a result of the reaction.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What must occur in order for a chemical reaction to be specifically classified as endothermic instead of

• Atoms are rearranged.

• Chemical bonds are formed.

• Energy is released in the form of heat.

• Energy is absorbed in the form of heat.

Tags

NGSS.HS-PS1-4

Which best explains why a firework being ignited is an example of an exothermic reaction and not an endothermic reaction?

• The fireworks produce colors.

• The fireworks give off heat.

• Igniting the fireworks requires energy.

• Igniting the fireworks makes an odor.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5