CHM 101 Exam 1 Donovan 2026 | 100+ Chemistry Practice Questions with Answers & Detailed Rationales

CHM 101 Exam 1 – Donovan
Complete Practice Exam with 100+
Questions, ANSWERs, and Rationales 2026




SECTION 1: UNIT CONVERSIONS AND METRIC SYSTEM

Question 1

Convert 3.59 kg into grams. Do not include units in your ANSWER.



ANSWER: 3590



Rationale: 1 kg = 1000 g. Multiply 3.59 × 1000 = 3590 g.



Question 2

Convert from 2000.4 mm to kilometers. Do not include units in your ANSWER.



ANSWER: 0.0020004



Rationale: 1 km = 1,000,000 mm. Divide 2000.4 ÷ 1,000,000 = 0.0020004 km.



Question 3

Convert 62 picometers to millimeters. Do not use units or scientific notation in your ANSWER.



ANSWER: 6.2e-8

,Rationale: 1 pm = 10⁻¹² m and 1 mm = 10⁻³ m. 62 pm × (10⁻¹² m/1 pm) × (1 mm/10⁻³ m) = 6.2 × 10⁻⁸ mm.



Question 4

Convert 5.45 micrograms to femtograms. Do not include units in your ANSWER and do not use scientific
notation.



ANSWER: 5450000000.0



Rationale: 1 μg = 10⁻⁶ g and 1 fg = 10⁻¹⁵ g. 5.45 μg × (10⁻⁶ g/1 μg) × (1 fg/10⁻¹⁵ g) = 5.45 × 10⁹ fg =
5,450,000,000.0 fg.



Question 5

Convert 35 centigrams to grams. Do not include units in your ANSWER.



ANSWER: 0.35



Rationale: 1 cg = 0.01 g. 35 × 0.01 = 0.35 g.



Question 6

Convert 0.067 microliters to liters. Do not include units in your ANSWER.



ANSWER: 6.7e-08



Rationale: 1 μL = 10⁻⁶ L. 0.067 × 10⁻⁶ = 6.7 × 10⁻⁸ L.



Question 7

Convert 25°C to Kelvin.

,ANSWER: 298 K



Rationale: K = °C + 273.15. 25 + 273.15 = 298.15 K ≈ 298 K.



Question 8

Convert 68°F to degrees Celsius.



ANSWER: 20°C



Rationale: °C = (5/9)(°F − 32). (5/9)(68 − 32) = (5/9)(36) = 20°C.



Question 9

Convert 0.450 L to milliliters.



ANSWER: 450 mL



Rationale: 1 L = 1000 mL. 0.450 × 1000 = 450 mL.



Question 10

Convert 2.5 hours to seconds.



ANSWER: 9000 s



Rationale: 1 hour = 60 minutes = 3600 seconds. 2.5 × 3600 = 9000 s.



SECTION 2: SIGNIFICANT FIGURES

Question 11

How many significant figures are in the following number? 100

, ANSWER: 1



Rationale: Trailing zeros without a decimal point are not significant. Only the "1" is significant.



Question 12

How many significant figures are in the following number? 0.00090



ANSWER: 2



Rationale: Leading zeros are not significant. The digits "9" and the trailing zero after the decimal are
significant.



Question 13

How many significant figures does the following number have? 1.000803



ANSWER: 7



Rationale: All digits in a number with a decimal point are significant, including zeros between non-zero
digits.



Question 14

How many significant figures does the following number have? 0.0000000001



ANSWER: 1



Rationale: Leading zeros are not significant. Only the "1" is significant.



Question 15

How many significant figures does the following number have? 5.6709