Chem_5ed Chap 3 Review

What is a mole?

• A mole is a type of chemical reaction.
• A mole is a measure of temperature in chemistry.
• A mole is a type of animal found in gardens.
• A mole is a unit of measurement for amount of substance, equal to 6.022 x 10^23 particles.

What does 525600 g equal in kilograms?

• 525.6 kg
• 5250 g
• 526 kg
• 530 kg

If you measure the volume of a liquid 3 times and find your measurements to be 12.5 mL, 12.4 mL, and 12.8 mL and the actual value is 12.6 mL, how would you describe your measurement?

• accurate but not precise

• both accurate and precise

• neither accurate nor precise

• precise but not accurate

If you were to measure the volume of a liquid 3 times and measure it to be 25.6 mL, 25.5 mL and 25.7 mL, but the actual measurement is 31.2 mL, how would you describe your measurement?

• accurate but not precise

• precise but not accurate

• both accurate and precise

• neither accurate nor precise

How can you measure the accuracy of a measurement?

• by comparing it to the known value

• by finding a small percent error

• by checking if your measurement makes sense within its context

• all of these are ways to check accuracy

convert 987 km to mm

• 9.87 x 10⁶ mm

• 9.87 x 10⁴ mm

• 9.87 x 10^-6 mm

• 9.87 x 10⁸ mm

How many significant figures are in this measurement: 0.000050430 g

• 8

• 6
• 5
• 4
• 10

How many significant figures are in this measurement: 2.00300 g

• 6
• 2

• 4
• 5

If a substance has a volume of 65.04 mL and a mass of 85.15 g, what is its density?

• 0.85 g/mL
• 0.7638 g/mL

• 1.309 g/mL

• 1.31 g/mL

Perform this operation: (365 m)(2.6 km)

• 950000 km²

• 0.95 km²

• 0.949 km²

• 949000 km²