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3 years ago

Which of the following has exactly 3 significant figures?

Biology

2 answers:

Stolb23 [73]3 years ago

8 0

Answer:

A. 0.0451

Explanation:

To determine the amount of significant figures in numbers in science, it is important to follow specific rules:

A non-zero digit is significant. For example: 0.0211

Zeros located between two significant numbers are significant. For example: 56.20006

Trailing zeros in cases of the presence of a decimal point. For example: 434.9100

Option A. 0.0451 has three significant figures: 4, 5, 1.

Option B. 450 has two significant figures: 4, 5.

Option C. 32.10 has four significant figures: 3, 2, 1, 0.

Option D. 370.0 has four significant figures: 3, 7, 0, 0.

Therefore, option A. 0.0451 is the correct answer.

BaLLatris [955]3 years ago

7 0

Answer:

Explanation:

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Black coffee has a pH around 5; hand soap has a pH of 10. How many times more acidic is coffee relative

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Answer:

$\boxed {\boxed {\sf 10^5 \ or \ 100,000 \ times \ more \ acidic}}$

Explanation:

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This scale is unique because it is logarithmic. So, every time the pH changes by 1 on the scale, the actual concentration of the solution increases or decreases by a tenfold.

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$10^ {difference \ in \ pH}$

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$10^5=100,000$

Coffee is 10⁵ or 100,000 times more acidic than hand soap.

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