CHEM 103
Chemistry 103 Module 1 Exam : 100 Multiple-Choice Questions
with Correct Answers and Detailed Rationales
Gradegurus
This exam contains:
❖Chemistry 103 Module 1 Exam
❖100 Multiple-Choice Questions with Correct Answers and
Detailed Rationales
,Chemistry 1.1–1.11: Practice Quiz with Correct Answers
and Rationales
1. Exponential Numbers
1. Express 0.00000456 in scientific notation.
A) 4.56 × 106
B) 4.56 × 10−6
C) 45.6 × 10−7
D) 0.456 × 10−5
Correct Answer: B
Rationale: The number is smaller than 1, so the exponent is negative. Move the decimal 6
places to the right: 4.56 × 10−6.
2. Convert 2.63 × 107 to standard form.
A) 26,300,000
B) 2,630,000
, C) 263,000
D) 0.000000263
Correct Answer: A
Rationale: Positive exponent means the number is larger than 1. Move the decimal 7
places to the right: 26,300,000.
3. Write 7,800,000 in scientific notation.
A) 7.8 × 105
B) 7.8 × 106
C) 78 × 105
D) 0.78 × 107
Correct Answer: B
Rationale: The number is larger than 1, so the exponent is positive. Move the decimal 6
places to the left: 7.8 × 106.
4. Convert 8.26 × 10−5 to standard form.
A) 0.0000826
B) 0.000826
C) 826,000
D) 0.00000826
Correct Answer: A
Rationale: Negative exponent means the number is smaller than 1. Move the decimal 5
places to the left: 0.0000826.
5. Express 0.000673 in scientific notation.
A) 6.73 × 104
, B) 6.73 × 10−4
C) 67.3 × 10−5
D) 0.673 × 10−3
Correct Answer: B
Rationale: The number is smaller than 1, so the exponent is negative. Move the decimal
4 places to the right: 6.73 × 10−4.
6. Convert 3.82 × 104 to standard form.
A) 3,820
B) 38,200
C) 382,000
D) 0.000382
Correct Answer: B
Rationale: Positive exponent means the number is larger than 1. Move the decimal 4
places to the right: 38,200.
2. Metric System — Unit Conversions
7. Convert 656 cm to meters.
A) 6.56 m
B) 65.6 m
C) 0.656 m
D) 6560 m
Correct Answer: A
Rationale: 656 cm × 100
1m
cm
= 6.56 m.
Chemistry 103 Module 1 Exam : 100 Multiple-Choice Questions
with Correct Answers and Detailed Rationales
Gradegurus
This exam contains:
❖Chemistry 103 Module 1 Exam
❖100 Multiple-Choice Questions with Correct Answers and
Detailed Rationales
,Chemistry 1.1–1.11: Practice Quiz with Correct Answers
and Rationales
1. Exponential Numbers
1. Express 0.00000456 in scientific notation.
A) 4.56 × 106
B) 4.56 × 10−6
C) 45.6 × 10−7
D) 0.456 × 10−5
Correct Answer: B
Rationale: The number is smaller than 1, so the exponent is negative. Move the decimal 6
places to the right: 4.56 × 10−6.
2. Convert 2.63 × 107 to standard form.
A) 26,300,000
B) 2,630,000
, C) 263,000
D) 0.000000263
Correct Answer: A
Rationale: Positive exponent means the number is larger than 1. Move the decimal 7
places to the right: 26,300,000.
3. Write 7,800,000 in scientific notation.
A) 7.8 × 105
B) 7.8 × 106
C) 78 × 105
D) 0.78 × 107
Correct Answer: B
Rationale: The number is larger than 1, so the exponent is positive. Move the decimal 6
places to the left: 7.8 × 106.
4. Convert 8.26 × 10−5 to standard form.
A) 0.0000826
B) 0.000826
C) 826,000
D) 0.00000826
Correct Answer: A
Rationale: Negative exponent means the number is smaller than 1. Move the decimal 5
places to the left: 0.0000826.
5. Express 0.000673 in scientific notation.
A) 6.73 × 104
, B) 6.73 × 10−4
C) 67.3 × 10−5
D) 0.673 × 10−3
Correct Answer: B
Rationale: The number is smaller than 1, so the exponent is negative. Move the decimal
4 places to the right: 6.73 × 10−4.
6. Convert 3.82 × 104 to standard form.
A) 3,820
B) 38,200
C) 382,000
D) 0.000382
Correct Answer: B
Rationale: Positive exponent means the number is larger than 1. Move the decimal 4
places to the right: 38,200.
2. Metric System — Unit Conversions
7. Convert 656 cm to meters.
A) 6.56 m
B) 65.6 m
C) 0.656 m
D) 6560 m
Correct Answer: A
Rationale: 656 cm × 100
1m
cm
= 6.56 m.
