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Stella [2.4K]
3 years ago
9

Even though we are well into the course Dumbledore notices some of the students are still having trouble with significant figure

s. Let’s review them once more: How many significant figures does the result of the following calculation have? (3.478-2.31)*(4.428-3.56)?
A) 1
B) 2
C) 3
D) 4
E) 5 2.
Chemistry
1 answer:
Sphinxa [80]3 years ago
5 0

Answer:

B) 2

Explanation:

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

The rule apply for the multiplication and division is :

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

The rule apply for the addition and subtraction is :

The least precise number present after the decimal point determines the number of significant figures in the answer.

(3.478-2.31) = 1.168 ≅ 1.17 (Rounded to least decimal digit)

(4.428-3.56) = 0.868 ≅ 0.87 (Rounded to least decimal digit)

So,

1.17 * 0.87 = 1.0  (Rounded to least significant)

Answer - two significant digits

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36. Dimensional Analysis: A useful way to convert units using multiplication & division *Always start with what you are give
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A) 7.9 x 10⁶ inches

B) 1004 g

C) 2.8 x 10³ inches/ min

D) 1.2 x 10⁻⁴ mm

Explanation:

A) Since 39.37 inches = 1 m, you can convert meters to inches by multiplying by the conversion factor (39.37 inches /  1 m).

Notice that if 39.37 inches = 1 m then 39.37 inches / 1 m = 1. That means that when you multiply by a conversion factor, you are only changing units since it is the same as multiplying by 1 :

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3 years ago
Read 2 more answers
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