Chemical changes caused by heat,light,electricity

A student mixed two substances in a test tube, he

noticed that the test tube became warm. He also

noticed an odor coming from the test tube. Based

on Jose's observations, what was

most likely occurring inside the test tube?

• A. The substances were melting.

• B. The substances were evaporating.

• C. The substances were undergoing a chemical

  reaction.

• D. The substances were undergoing an

  endothermic reaction.

Tags

NGSS.MS-PS1-2

Which process is an example of a chemical change?

• An iron nail rusting

• Bath water cooling while you take a bath

• A piece of metal being heated until it expands

• A glass window breaking when hit with a baseball

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A physical change is...

• Something that changes the physical properties of a substance (size, shape or form)

• A reaction that rearranges the particles of two or more substances to create at least one new substance.

• A reaction that changes the color, produces odor, creates sounds, releases gas and produces light.

Tags

NGSS.MS-PS1-4

Breaking down a substance into simpler substances

• Displacement
• Synthesis
• Decomposition
• Oxidation

Combining a substance with oxygen

• Displacement
• Synthesis
• Decomposition
• Oxidation

Tags

NGSS.HS-LS1-7

What type of reaction is the equation 2NaCl →2Na +Cl₂?

• Synthesis Reaction
• Decomposition Reaction
• Single Displacement Reaction
• Double Displacement Reaction

Tags

NGSS.MS-PS1-2

Consider the chemical equation CH₄ + 2 O₂ → CO₂ + 2 H₂O. In this equation, CH₄ is a

• product
• reactant
• displacement

Tags

NGSS.MS-PS1-5

Consider the equation 4 Fe+3 O₂ → 2 Fe₂O₃ . In this equation, 3 O₂ is a

• product
• reactant
• compound

Combustion reactions will always involve

• Oxygen and a solid

• Liquid nitrogen and heat

• Oxygen and heat/energy

• CO and H₂O

What are the products in the following chemical equation? 
2H₂ + O₂   -->   2H₂O

• H₂
• O₂
• 2H₂ + O₂
• 2H₂O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5