Chemistry Unit Exam

A solution has a pH of 5. The solution is...

• an acid

• a base

• neutral

• all of the above

The KI (potassium iodide) that we used in our "elephant toothpaste" experiment helped facilitate the reaction, but didn't actually participate in it. This makes it a....

• Product

• Reactant

• Enzyme

• Catalyst

Classify this reaction

• Combustion

• Synthesis

• Decomposition

• Single Displacement

• Acid/Base

When potassium (K) reactions with water (H2O), it produces a very basic solution. Which product is responsible for the high pH?

K + H₂O --> KOH + H₂

• K

• H₂O

• KOH

• H₂

Balance this equation

(your answer should be a number)

Which of the following is the formula for the poly-atomic ion hydroxide?

• OH

• SO₄

• NH₄

• H₂O

An ice cube melting would be classified as what type of reaction?

(the ice cube is the system)

• Endothermic

• Exothermic

• Both

• Neither

Looking at the reaction diagram, what is the activation energy in kJ?

(your answer should just be a number)

Looking at this reaction, how energy was released/absorbed?

• 240 kJ

  Absorbed

• 80 kJ

  Absorbed

• 240 kJ

  Released

• 80 kJ

  Released

Which of the following does NOT affect reaction kinetics?

• Geometry of the Molecule

• Concentration

• Temperature

• pH