Math of Chemistry Retest Review

You know 1000 mg = 1 g. Convert 2.5 grams to milligrams.

• 25 mg

• 250 mg

• 0.00025 mg

• 2500 mg

If 1 plop = 2.5 yims and 1 yim = 4.1 bunts, how many bunts are in 3.6 plops? Round to the nearest whole number.

How would you write 564,000,000 in scientific notation?

• 5.64 x 10^-7

• 5.64 x 10⁸

• 5.64 x 10^-8

• 5.64 x 10⁷

What is 9.3 x 10^-3 in standard form?

• .093

• 9.300

• .0093

• 9300

What is 7.0 x 10^-5 in standard form?

• .000070

• .0000070

• 700,000

• 70,000

What is the molar mass of C₂H₄O₂? Round to the nearest whole number.

• 40g

• 60g

• 50g

• 68g

What would the mass (grams) be of 1.5 mol H₂O? Round to the nearest whole number.

• 20 g

• 27 g

• 32 g

• 40 g

How many molecules would be in 8.4 moles of C₈H₁₈?

• 5.06 x 10²⁴

• 5.06 x 10²³

• 1.39 x 10^-23

• 1.39 x 10^-24

Which has more molecules?

• 1 mole H2O

• 1 mole NaCl

• 1 mole Al(OH)₃

• They are all the same

How many moles of carbon atoms are there in 5 g of carbon?

• 60.06 moles

• 0.42 moles

• 17.22 moles

• 0.98 moles