6.6E ! Evidence of Chemical Changes TEST

Abigail, Ava, and Aiden were doing a science project. They observed different scenarios and had to identify which one shows that a chemical reaction has occurred. Which of the following scenarios they observed shows that a chemical reaction has occurred?

• Abigail struck a rock with a hammer and it broke into smaller pieces.

• Aiden left a hammer outside for too long and rust formed on it.

• Ava added a few drops of red food coloring to a cup of water and it turned pink.

Tags

NGSS.MS-PS1-2

TEKS.SCI.6.6E

A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?

• The level of the substance in the beaker is higher after the other liquid is added.
• A yellow solid forms and then settles to the bottom of the beaker.
• Small white crystals are left behind in the flask that held the first liquid.

Tags

NGSS.MS-PS1-2

TEKS.SCI.6.6E

Which of the following is NOT evidence that that a chemical reaction has occurred?

• produces light/heat
• production of a gas
• formation of a precipitate
• melting

Tags

NGSS.MS-PS1-2

TEKS.SCI.6.6E

Which observation(s) might be used as evidence that a chemical reaction occurred in this picture ?

• Color change
• Odor change
• Temperature change

• All of the above

Tags

NGSS.MS-PS1-2

TEKS.SCI.6.6E

Identify if example or not example of a chemical change.

Groups:

(a) Evidence of Chemical Reaction

,

(b) Not evidence of chemical reaction

• Melting

• Production of light

• Temperature Change

• Mixing

• Gas Production

• Formation of a precipitate

• Boiling

• Dissolving

• Freezing

• Color Change

Tags

NGSS.MS-PS1-2

Match the following is evidence of a chemical reactions.

• Production of gas

• 
• Formation of a precipitate

• 
• Change in temperature Exothermic

• 
• Change in temperature

  Endothermic

• 
• Change in color

• 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Is this an example of a chemical reaction?

• True

• False

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following are examples of chemical reactions? Choose all that apply (2)

• two liquids combine and a gas is released

• a substance is added to water and dissolves

• two liquids are combined and a solid precipitate forms

• add food coloring to water

Tags

NGSS.MS-PS1-2