Compounds and Chemical Reactions

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

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

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

A solid is formed when two liquids (or solutions) are mixed together. Select the correct vocabulary word that goes with this definition.

• cloud

• precipitate

• vinegar

• heat

Tags

NGSS.MS-PS1-2

A subscript is

• the number of atoms that each element has in a chemical formula.

• at the pharmacy.

• the number of molecules.

• a compound.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Kaida was assigned the task of making a model volcano. To make her volcano erupt, Claudia mixed baking soda and vinegar. When these two substances came in contact with one another they produced bubbles and fizzed making it look like the volcano was erupting. After "erupting" her volcano Claudia's teacher told her that she had created a chemical reaction inside of the volcano. What evidence did Claudia see of a chemical reaction?

• change in color

• gas production

• change in odor

• light production

Tags

NGSS.MS-PS1-2

Burning a candle is a chemical change. What is the primary evidence that burning the candle is a chemical reaction?

• change in color

• change in odor

• formation of a solid

• temperature change

Tags

NGSS.MS-PS1-2