# Determine whether each molecular diagram represents 3 pure

## Problem 42E Chapter 1

Chemistry: A Molecular Approach | 3rd Edition

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Chemistry: A Molecular Approach | 3rd Edition

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Problem 42E

Determine whether each molecular diagram represents 3 pure substance or a mixture. If it represents 3 pure substance, classify the substance as an element or a compound. If it represents 3 mixture, classify the mixture as homogeneous or heterogeneous.

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Solution 42E: All digits of a measurement including uncertain number are called significant figures. Significant figures = all certain digits + one uncertain digit The rules for determining the significant figures are (i) Zeros between nonzero digits are always significant (ii) Zeros at the beginning of a number are never significant. (iiI) Zeros at the end of a number are significant if the number has a decimal point only. Rules for find out the significant figures for multiplication and division When multiplication and division is carried out, the results must contain the same significant figures with the measured one which has the fewest significant figures. That is way the result should be rounded off when it contains more correct significant figures. Rules for find out the significant figures for Subtraction and addition The decimal places will be same for the result as the the measurement with the fewest decimal places.That is way the result should be rounded off when it contains more correct significant figures. Rules for rounding off the significant figures If the result contains more number of correct significant figures, then the result should be rounded off. (i) To round off the number, we have to look carefully the leftmost digit which one, we are going to be removed. (ii) If the removing leftmost digit is less than 5, then the number should be keep unchanged (iii) if the removing leftmost digit is 5 or more than 5, then the preceding number is increased by one. (a) 320.5-(6104.5/2.3) Here we have to calculate the final value by using the following operation = 320.5- (2654.13) = -2333.630...

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##### ISBN: 9780321809247

The answer to “Determine whether each molecular diagram represents 3 pure substance or a mixture. If it represents 3 pure substance, classify the substance as an element or a compound. If it represents 3 mixture, classify the mixture as homogeneous or heterogeneous.” is broken down into a number of easy to follow steps, and 39 words. This textbook survival guide was created for the textbook: Chemistry: A Molecular Approach, edition: 3rd. The full step-by-step solution to problem: 42E from chapter: 1 was answered by Sieva Kozinsky, our top Chemistry solution expert on 02/22/17, 04:35PM. Chemistry: A Molecular Approach was written by Sieva Kozinsky and is associated to the ISBN: 9780321809247. This full solution covers the following key subjects: Answer, appropriate, carry, express, figures. This expansive textbook survival guide covers 82 chapters, and 9464 solutions. Since the solution to 42E from 1 chapter was answered, more than 284 students have viewed the full step-by-step answer.

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