Compounds & Chemical Reactions #21

What is evidence that a chemical reaction has occured?

• Shredding paper

• Blue & Red paint mixing to make purple paint

• a new gas is observed in the form of bubble

• a phase change occurs

Tags

NGSS.MS-PS1-2

Peyton & Michael take two clear liquids and mix them together. When observing the final product, you notice a yellow solid has formed. What is the term for the solid that is formed as a result of a chemical change?

• condensate

• evaporate

• precipitate

• sublimate

Tags

NGSS.MS-PS1-2

Julia & Jillian were enjoying the fireworks when they got into a chemistry argument. Julia insisted that the fireworks were the result of a chemical reaction. Jillian disagreed. What would you tell them to solve this argument?

• It is a change of state, solid to gas, due to the addition of energy.

• It was a physical reaction since the fuse was lit and heat was produced.

• The color changes and the release of energy indicate a chemical reaction.

• It is an endothermic reaction because energy was added.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Evidence of a chemical change does NOT include

• producing a gas.

• change in color.

• change in shape.

• change in temperature.

Tags

NGSS.MS-PS1-2

A compound is a pure substance composed of two or more elements, combined by chemical means, in a definite ratio. Which container represents a chemical compound? Hint: An elements chemical symbol only contains ONE uppercase letter.

• Cl

• Na

• N₂

• H₂O

Tags

NGSS.MS-PS1-1

Which model represents the chemical formula NO_2, nitrogen dioxide?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

Boiling Water (select the correct answer)

• Physical Change

• Chemical Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

What evidence(s) of a chemical reaction do you see in the pictures? (Select all that are correct)

• Gas

• Precipitate

• Color Change

• Giving off light

Tags

NGSS.MS-PS1-2

What evidence of a chemical reaction do you see in the picture?

• bubbling (bubbles)

• color change

• precipitate

• heat

Tags

NGSS.MS-PS1-2

Which of the following are evidence(s) of a chemical change that you see in the picture? (Select all that are correct.)

• giving off light

• wood

• camping

• temperature change

Tags

NGSS.MS-PS1-2