Chemical Changes

Chemical Changes

How do we know?

Multiple Choice

Select the example of a chemical change - creating a new substance:

• Snow melts into water.

• Campfire turning wood into ash

Multiple Choice

Select the proper chemical reaction versus a physical change:

• child blows bubbles in his milk

• Vinegar and bakingsoda fiz making bubbles

Multiple Choice

Select the chemical change that produces light:

• Luminol fluorescing after it encounters blood

• Light-bulb illuminating when electrons are forced through a thin wire

Multiple Choice

Which is the correct example of a chemical change identified by temperature changing

• Temperature of a glass of water dropping when ice put in.

• Seal broken between water and amonium nitrate allowing them to mix in an icepack

Multiple Choice

Select the correct chemical change exemplified by color change:

• Colorless phenolphthalein mixed with a colorless strong base creating a pink color

• Mixing blue and red paintto create a purple paint

Multiple Choice

Identify the chemical change as indicated by the precipitate:

• Little mineral chunks falling to the bottom of a glass of ice water as ice melts

• A red crusty substance building up on a metal post for a bridge over seawater

Multiple Choice

Identify the chemical reaction as indicated by the odor:

• Food that has gone bad after being in the fridge too long

• Perfume applied to the wrist