Pre-AP CHEM Unit 1 MC Exam Practice Days 1-2

Which of the following numbers has three significant figures? 

• 16.07 
• 0.0140 
• 1.070 
• 7,203.00 

Using significant figures, what is the proper solution to the following equation? 
(150 + 2.5 + 36.75) ÷ (6.60 + 0.173) =
 

• 30
  
• 28
  
• 27.9
  
• 27.94
  

You have a reported 1 pound bar of gold.  Every time you determine its mass on a balance, the balance reads a mass of 937.00g. (1 lb = 453.6 g)
This is an example of 

• Precision ONLY
• Accuracy ONLY
• BOTH Precision AND Accuracy
• NEITHER Precision NOR Accuracy

A student calculates the density of iron as 6.8g/cm³ using lab data for mass and volume.  A handbook reveals that the correct value is 7.86g/cm³.  What is the percent error to correct significant figures?  
The percent error formula is on your formula chart, but it's a good idea to memorize it:)

• 13%
• 13.5%
• -16%
• 15.6%

The number 2.0×10¹⁵ is 

• greater than one
  
• less than one
  
• smaller than 2.0 × 10⁻¹⁵
• equal to 2.0 × 10⁻¹⁵

How many grams of tomatoes are equivalent to 2.09 pounds of tomatoes?  (1 lb = 453.6 g) Answer using correct number of significant figures. 

• 948.0 g 
• 948 g
• 217.0 g
• 217 g

Ponder the epic statements of equality below:
1 quaffle = 120 winkles
1 twirrel = 52 kerpinkles
24 kerpinkles = 97 quaffles
Which dimensional analysis shown correctly indicates the number of twirrels in 240 winkles?

• A
• B
• C
• D

Which dimensional analysis shown correctly indicates the number of nanoliters in 72 kiloliters?

• A

• B

• C

• D

For the conversion of 0.073 gallons to milliliters, the conversion factors are:
4 quarts = 1 gallon
1.057 quarts = 1 liter
1×10⁻³ liters = 1 milliliter
The correctly expressed answer is 

• 3.1 x 10² mL
• 3.09 x 10² mL
• 2.76 × 10² mL 
• 2.8 × 10² mL 

Which piece of lab equipment shown could be used to most precisely measure the volume of a liquid?

• Beaker
• Graduated Cylinder
• Buret
• All three would make equally precise measurements