(a) Interpretation: ( 7.9 × 10 4 ) + ( 5.2 × 10 4 ) must be added using the correct number of significant figures in the answer. Concept Introduction: For addition, the number with minimum number of significant figures is chosen and in the final answer same number of significant number is kept. The answer should not be more precise than the number with minimum number of significant figures.
(a) Interpretation: ( 7.9 × 10 4 ) + ( 5.2 × 10 4 ) must be added using the correct number of significant figures in the answer. Concept Introduction: For addition, the number with minimum number of significant figures is chosen and in the final answer same number of significant number is kept. The answer should not be more precise than the number with minimum number of significant figures.
Solution Summary: The author explains that the final result must contain two significant figures.
(7.9×104)+(5.2×104) must be added using the correct number of significant figures in the answer.
Concept Introduction:
For addition, the number with minimum number of significant figures is chosen and in the final answer same number of significant number is kept. The answer should not be more precise than the number with minimum number of significant figures.
Interpretation Introduction
(b)
Interpretation:
(8.73×104)+(6.7×103) must be added using the correct number of significant figures in the answer.
Concept Introduction:
For addition, the number with minimum number of significant figures is chosen and in the final answer same number of significant number is kept. The answer should not be more precise than the number with minimum number of significant figures.
Interpretation Introduction
(c)
Interpretation:
(3.63×10−4)+(4.776×10−3) must be added using the correct number of significant figures in the answer.
Concept Introduction:
For addition, the number with minimum number of significant figures after decimal point is chosen and in the final answer same number of significant number is kept after decimal point. The answer should not be more precise than the number with minimum number of significant figures.
3:18
For each of the following, carry out the mathematical operation and report answers in scientific
notation.
X
(a) (2.88 x 10¹) × (3.2 × 10-10)
x 10 (select)
(b) (6.1 × 107) ÷ (2.5 × 10-4)
x 10 (select)
(c) (2.2 × 10−7) ÷ (9.2 × 107)
x 10 (select) ✓
(d) (7.6 × 10¹)³
× 10 (select) ✓
(e) (3.81 x 104) (9.8 x 105)
X 10 (select) ✓
(fi) (7.44 × 107 ) ÷ (2.46 × 10¯¹)
× 10 (select) ✓
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5.31
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8
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6.53
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7
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Q1: Fill the below situations in the table
Chemical change
Physical change
Melting of wax
• Evaporation of alcohol
• Burning a paper
• Dissolving salt in water
• Grinding a salt, then reacting it with another
• Rusting of iron
Q2: Find the answer according significant figures?
• 1.00021+ 0.112 - 0.0032
• 10. × 15
2.07+0.031
7.001(1.9–0.04)
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