Significant Figures Rules
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Questions and Answers

Which of the following is a correct rule regarding significant figures according to the text provided?

  • Zeroes at the end of a number are significant, regardless of the presence of a decimal point.
  • Non-zero numbers are not considered significant.
  • Leading zeroes are always significant.
  • Zeroes between non-zero numbers are not considered significant. (correct)

What is the correct rule for significant figures in relation to ending zeroes in a number?

  • Ending zeroes are never significant.
  • Ending zeroes are only significant if there is no decimal point present.
  • Ending zeroes are significant only if there is a decimal point present. (correct)
  • All ending zeroes are always significant.

How many rules from the total 5 rules for determining significant figures mention that all non-zero numbers are significant?

  • 1 (correct)
  • 4
  • 2
  • 3

Which of the following numbers has both leading and ending zeroes that are significant?

<p>0800.10 (A), 800.1 (D)</p> Signup and view all the answers

In the context of significant figures, how are leading zeroes treated according to the rules?

<p>Leading zeroes are never considered significant. (A)</p> Signup and view all the answers

If a number has multiple rules for determining significant figures applied to it, which rule takes precedence?

<p>'Rules 1 &amp; 4' (A), 'Rules 1 &amp; 4' (B)</p> Signup and view all the answers

When rounding the answer, why did the final mass of 917.551 g become 917.55 g?

<p>To match the least number of significant figures in the numbers provided. (C)</p> Signup and view all the answers

What is the total mass when 0.03 g of NaCl is added to 155 g of water?

<p>155.03 g (A)</p> Signup and view all the answers

In the calculation 28.3 cm X 5.0 cm, why is the answer rounded to 140 cm2 instead of 141.5 cm2?

<p>To align with the least precise measurement's significant figures. (D)</p> Signup and view all the answers

Why does 454.02 g of aluminum hydroxide multiplied by 5.2 g equal 2400 g?

<p>To match the least number of significant figures in the numbers provided. (D)</p> Signup and view all the answers

Flashcards

Significant Figures Rule

Zeroes between non-zero numbers are significant.

Ending Zeroes

Ending zeroes are significant only with a decimal point.

Non-zero Significance

All non-zero numbers are always significant.

Leading Zeroes

Leading zeroes are never considered significant.

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Rule Precedence

When multiple rules apply, follow Rules 1 & 4.

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Rounding Rules

Final mass adjusted to least significant figures.

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Mass Calculation

0.03 g of NaCl + 155 g water = 155.03 g total mass.

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Area Calculation Rounding

In 28.3 cm X 5.0 cm, round to 140 cm².

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Mass Multiplication

454.02 g Al(OH)₃ X 5.2 g = 2400 g based on significant figures.

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Total Significant Figures

There are 5 rules for determining significant figures.

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