Unit 1 Review

Which measurement contains a total of three significant figures?

• 0.01 g

• 0.010 g

• 0.0100 g

• 0.01000 g

Using the rules for significant figures, the sum of 0.027 gram and 0.0023 gram should be expressed as

• 0.029 gram

• 0.0293 gram

• 0.03 gram

• 0.030 gram

The following weighings were made during a laboratory exercise: Mass of evaporating dish ........... 59.260 g Mass of sugar sample ............... 1.61 g What is the total mass of the evaporating dish plus the sample, expressed to the proper number of significant figures?

• 60.870 g

• 60.87 g

• 60.9 g

• 61 g

Which milligram quantity contains a total of four significant figures?

• 0.3010 mg

• 3010 mg

• 3100 mg

• 30001 mg

In a laboratory exercise to determine the density of a substance, a student found the mass of the substance to be 6.00 grams and the volume to be 2.0 milliliters. Expressed to the correct number of significant figures, the density of the substance is

• 3.000 g/mL

• 3.00 g/mL

• 3.0 g/mL

• 3 g/mL

The diagram shows a section of a 100-milliliter graduated cylinder. When the meniscus is read to the correct number of significant figures, the volume of water in the cylinder would be recorded as

• 75.7 mL

• 75.70 mL

• 84.3 mL

• 84.30 mL

Which measurement has the greatest number of significant figures?

• 6.060 mg

• 60.6 mg

• 606 mg

• 60600 mg

Base your answer to the question on the table shown.

The density of hydrogen at STP is 0.0899 gram per liter. Express this density to two significant figures.

• 0.090

• 0.089

• 0.09

• 0.091

Which is an example of a compound?

• ammonia

• calcium

• diamond

• uranium

Which pair are classified as chemical substances?

• mixtures and solutions

• compounds and solutions

• elements and mixtures

• compounds and elements