Signs of a Chemical Change

Fizzing and bubbles are NOT signs of a chemical change, but they are evidence that which sign has occurred?

• heat was released

• light was given off

• a gas was produced

• a precipitate formed

Tags

NGSS.MS-PS1-2

You know you a chemical reaction has occurred if 

• there is a precipitate.

• there is a color change.

• there is a temperature change.

• All of these answers are evidence.

Tags

NGSS.MS-PS1-2

One of the signs of a chemical reaction taking place is:

• Bubbles are produced 

• Reactants are not combining

• Products are not forming

• Color is not changing

Tags

NGSS.MS-PS1-2

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

Which is NOT an indication of a chemical change?

• temperature change

• formation of a precipitate

• shape change

• production of light

Tags

NGSS.MS-PS1-2

The Best Friend's Club uses "invisible ink" to write notes to each other. The invisible ink is actually lemon juice that is clear when it dries on paper, but turns brown when a club member holds a burning candle under the paper. Once it is heated, it is never invisible again.
 What type of change is occurring when the paper is heated?

• chemical change

• elemental change

• physical change

• temperature change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Substances giving off a smell (____________) while being combined is also an indicator of a chemical reaction.

• light

• odor

• molecule

• precipitate

Tags

NGSS.MS-PS1-2

Can you now list the 5 signs of the chemical reaction?

• Yes I can list the 5 signs

• Yes I can list 4 signs

• Yes I can list 3 signs

• Yes I can list 2 signs

• No,I can't list any sign

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The glow stick reaction is a

• Chemical change

• Physical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the evidence that a chemical change has taken place?

• gas production

• change in energy

• change in color

• production of a precipitate

Tags

NGSS.MS-PS1-2