Chemistry Quiz

A student measures the mass of a 1.00 g aluminum rod as 0.99 g. The best estimate of the percent error associated with this measurement is

• 0.01 %

• 0.1%

• 1%

• 10%

The most efficient way to determine whether a reaction is an exothermic chemical reaction is to use

• an oxygen probe

• a temperature probe

• a pressure probe

• a pH probe

• I don't know

2Al(C₂H₃O₂)₃ + 3BaSO₄ → Al₂(SO₄)₃ + 3Ba(C₂H₃O₂)₂ Which type of chemical reaction does this equation represent?

• Synthesis

• Neutralization

• Oxidation - Reduction

• Double Replacement

• I don't know

A student measured the mass of a small object and found it to be 80.2 grams. The object's mass is known to be 70.6 grams. What is the percent of error in the student's measurement?

• 0.14 %

• 14 %

• 0.12 %

• 12 %

How many significant digits are in 0.0450 grams?

• 5

• 4

• 3

• 2

What is the volume of the water in this graduated cylinder?

• 4.41 mL

• 4.42 mL

• 4.38 mL

• 5.61 mL

A student wants to do an experiment that studies the effects of temperature on balloon volume. The student should

• Research the chemical properties of many different balloons.

• Measure the volume of the balloon at various pressures, keeping the temperature constant.

• Measure the volume of the balloon at various temperatures, keeping the pressure constant.

• Measure the temperature of the balloons at various pressures, keeping volume constant.

What is the charge (oxidation number) of an oxide ion?

• -1

• +1

• -2

• +2

What is the molarity of a solution with 0.2 moles of potassium permanganate (KMnO2) dissolved in enough water to make a 500.0 mL solution?

• 0.0004 M

• 0.1 M

• 0.4 M

• 100 M

• I don't know

What is the density of an aqueous solution that has a mass of 10.081 g and 12.5 mL?

• 126 g/mL

• 0.806 g/mL

• 1.24 g/mL

• 0.008 g/mL

• I don't know