8.5E Evidences of Chemical Reactions

Evidence of a chemical reactions is anything that shows - 

• a new substance has formed
• a solid dissolved in a liquid
• interaction between 2 gases
• a change in the state of matter

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

You know that a chemical reaction is occurring here because you see __________________ . (Pick 3)

• purple color

• smoke

• ice formation

• fire

• a yellow precipitate

Tags

NGSS.MS-PS1-2

Which is the name of the kind of solid substance formed in this figure?  

• aqueous 
• precipitate
• acid
• synthesis 

Tags

NGSS.MS-PS1-2

Baking soda and vinegar combine to make carbon dioxide, which is a (a)   change?

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which statement best describes evidence that a chemical reaction occurs as a cake bakes?

• The water in the cake batter evaporates.

• The cake rises as gas bubbles form in the baking cake.

• The cake takes the shape of the container in which it is baked.

• The water in the cake batter is used to keep the cake moist as it bakes.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a container, a solid consisting of clear crystals is combined with a blue liquid and the following observations are obtained.
 How many of the listed observations indicate a new substance was formed?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-2

For an investigation a student poured a blue solution of CuSO₄ into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes.
The student inferred that a chemical reaction occurred. What evidence supports this inference?

• A dark solid formed on the zinc metal.
• 
  The zinc metal remained silver-colored and shiny
• The CuSO₄ solution turned blue when the zinc metal was added.
• None of these

Tags

NGSS.MS-PS1-2

A change in the size, shape, or state of matter.

• chemical change
• physical change
• chemical reaction
• electron change

Tags

NGSS.MS-PS1-4

Which of the following could indicate a chemical change? 

• All of the answers could indicate Chemical Change 
• a color change has occurred 
• bubbles appear 
• identifying one or more new chemical products 

Tags

NGSS.MS-PS1-2

Exothermic reactions...

• Absorb energy
• Release energy
• Release Color
• Absorb Color

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1