AP Chem: Unit 4.1 & 4.4 Introduction to Reactions

Unit 4.1 & 4.4 Introduction to Reactions

by Jennifer Haycraft

Poll

Do you agree or disagree? Why?

• Agree, a new compound has been formed.

• Disagree, the substances can be separated by physical means.

• Agree, chemical changes always happen.

• Disagree, a color change is a is only a physical change

Multiple Choice

What is the best description of the matter shown below?

• Gas & Element

• Liquid & Element

• Solid & Compound

• Gas & Compound

• Liquid & Compound

Fill in the Blank

Chemical or Physical Change?

$$2H_2O\left(g\right)\ \rightarrow\ 2H_2\ \left(g\right)\ +\ O_2\ \left(g\right)$$  

Fill in the Blank

Chemical or Physcial Change?

$$H_2O\ \left(l\right)\ \rightarrow\ H_2O\ \left(g\right)$$  

Multiple Select

Which of the following represents a chemical process?

• Calcium chloride dihydrate is slowly heated in a crucible to become calcium chloride (anhydrous).

• A hydrocarbon, such as propane  $$C_3H_8$$  , undergoes combustion to power a grill.

• A rock climber's rope becomes frayed and the color of the rock.

• Acid rain corrodes an air conditioner coil.