Chemical Reactions

_______________ is an example of both a color change and new substance produced from a chemical change with oxygen and metal.

• shredded paper
• rust (iron oxide)
• wood chips
• melted wax

A candle wick burning is an example of a _________________________

• physical reaction
• condensation
• neutrons
• chemical reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

_____________________ is a chemical reaction in plants to produce glucose (sugar).

• Photosynthesis
• Decomposition
• Foliage 
• Respiration

In a ___________change, a substance changes into a different substance.

• Physical
• Chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of these is NOT a sign that a chemical change has occurred? 

• Change in shape.
• An unexpected color change
• A temperature change
• The formation of a precipitate

Tags

NGSS.MS-PS1-2

In a chemical reaction, bonds are broken and new bonds are formed that create new substances. Which of the following is the result of a chemical reaction?

• Salt
• Ice
• Atoms
• Catalysts

The smell your dog makes after eating to much people food.

• Chemical Change
• Physical Change

You know you a chemical reaction has occurred if 

• there is a precipitate (new solid)
• there is a color change.
• there is a temperature change.
• All of these answers are evidence.

Tags

NGSS.MS-PS1-2

When a candle melts, it is a ___________________  change.

• chemical
• physical
• transparent
• undefined

What indicates a chemical reaction occurred?

• Heat or Light is released
  heat or light is produced
• gas (bubbles) produced
• color change
• all of the above

Tags

NGSS.MS-PS1-2