# How Many Feet Is 250 Centimeters

**How Many Feet Is 250 Centimeters** – Careful and accurate measurements of ingredients are important when cooking and in the chemistry lab! Foundations of College Chemistry, 15th ed. Morris Hein, Susan Arena and Cary Willard & Schultz Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

Chapter Outline 2.1 Scientific Notation 2.2 Measurement and Uncertainty 2.3 Significant Figures A. Rounding Figures 2.4 Significant Figures in Calculations A. Addition or Subtraction B. Addition or Division B. Multiplication or Division Calculations 2.5 Calculation Measurement A. Metric Measurement. Volume 2.6 Dimensional Analysis: A Problem Solving Method 2.7 Percent 2.8 Temperature Measurement 2.9 Density Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

Table of Contents

## How Many Feet Is 250 Centimeters

3 2.1 Scientific notation Scientific notation: A way of writing very large or small numbers (measurements) in a contracted form. 2.468 x 108 A number raised to a power of 1-10 (-/+ or a fraction) Method of writing a number in scientific notation Move the decimal point from the original number to the first non-zero digit. Multiplying this number by 10 increases the number of places the decimal point has moved. The exponent indicates the direction the decimal moves. Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

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Write in scientific notation. Place the decimal between 4 and 2. 4.23 Decimal is moved to 4 places so that the exponent is 4. The decimal is moved to the right so that the exponent is negative. 4.23 x 10-4 Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

What is the correct scientific notation for the number 353,000 (to 3 significant figures)? a x 104 b x 105 c x 106 d x 10-5 e x 105 Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

Measurement: quantitative observation. Example: 1 cup, 3 eggs, 5 atoms, etc. Measurements are expressed by a numerical value and a 2. unit of measurement. Example: Numeric Value Units 50 Kilometers A measurement always requires a unit. Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

Every measurement made with the instrument requires estimation. There is uncertainty in the last digit of the measurement because this part of the numerical value is estimated. The remaining two digits are perfect. These numbers do not change in reading from person to person. A barometer invented by E. Torricelli- hence the name Tor Numerical values obtained from measurements are not exact values. 21.2 ºC Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

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All measurements have some degree of uncertainty. By convention, a measure usually consists of all specific figures and an estimated figure. Because of this level of uncertainty, any measurement can be expressed with a limited number of digits. e. Barometer invented by Torricelli – hence the name Tor these numbers are called significant numbers. Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

22.0 Recorded as °C (3 significant figures with uncertainty in last digit) Recorded as °C (4 significant figures with uncertainty in last digit) Barometer invented by E. Torricelli—hence the name Tor 22.0 ºC 22.11 ºC Copyright © 2016 Wiley & Sons , Inc. All rights reserved.

We must be careful to use the correct number in significant figures in calculations. e. Barometer invented by Torricelli- Hence Tor Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

1. All non-zero digits are significant. There are some numbers that have infinite sigs Eg. 12 inches is still in 1 foot Exact number has no uncertainty. 3. When zeros are significant: a. They are between non-zero digits Ex has 4 significant digits (7, 5, 0 and 4) b. They are at the end of the number after the decimal point. Ex has five significant digits (3, 2, 4, 1, and 0) Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

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Zeros are not significant: a. They appear before the first non-zero digit. Ex has three significant numbers (3, 2 and 1) that appear at the end of the number without a decimal point. Ex has three significant digits (6, 9 and 2) If you doubt the zeros are significant, use scientific notation! e. Barometer invented by Torricelli- Hence Tor Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

Let’s practice! How many significant figures are there in these measurements? 3.2 inches 2 significant figures 25.0 grams 3 significant figures 103 people Exact number (∞ number of sig figures) 0.003 kilometers 1 significant figure Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

With a calculator, answers are often expressed with more digits than the correct number of significant figures. These extra digits are subtracted from the reported number and the value of the last digit is determined by rounding. Rounding rules If the first digit after the number to be retained is: 1. < 5, the retained digit remains unchanged. Ex = 53.2 (Other digits dropped) Digit kept 2. ≥ 5, Digit kept increased by one. Ex = (Other digits reduced) Complete up to 8 digits Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

The number of significant figures is given. (four) 79.14 0.0435 (three) 136.2 (three) 136 (two) 0.18 Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

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The results of the calculation are only as accurate as the exact measurement. Calculations involving multiplication or division depend on the measurement with the least significant number of digits in the answer. Example 79.2 x 1.1 = 87.12 Since 1.1 has only two significant figures, the answer must have two significant figures. 79.2 x 1.1 = 87 Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

Important number. (12.18)(5.2) = 4.872 13 a. 4.9 b 4.8 4.872 e. 5.0 Answer rounded to 2 fig sig. (5.2 and 13 each have only 2 signs) Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

The results of the calculation are only as accurate as the exact measurement. Calculations involving addition or subtraction depend on the precision of the smallest measurement on which the significant figure of the answer depends. Example Add , 79 and 31.7. 136.23 79 31.7 246.93 The smallest precise number is 79, so the answer must be rounded to 247. Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

Important number. a b 130 129.5 129 142.57 13.0 – 129.57 Answer rounded to tenths. Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

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Important number. 10.1 12.18 5.2 a b c d – 6.98 The numerator must be rounded to the tenth place. 7.0 = 10.1 Now the final answer is rounded to 2 significant figures. Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

This calculation consists of ? – 0.005 A. 1 B. 2 C. 3 d. 4 1.6 23 0.005 24.595 The smallest number in the round (23). Round to the same place (25). Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

A standard system of measurement of mass, length, time, and other physical quantities. Based on standard units that vary by factors of 10. Prefixes are used to indicate multiples of 10. This makes the metric system a decimal system. Quantity Name Unit Abbreviation Length Meter m Mass Kilogram kg Temperature Kelvin K Time Second s Substance Mole Mole Electric Current Ampere A Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

Common metric system prefixes and numerical values for SI units Copyright © 2016 John Wiley & Sons, Inc. All rights reserved.

### What Is 250 Cm In Feet And Inches?

Meter (m): A standard unit of length in the metric system. Definition: Distance light travels in a vacuum in 1/299, 792, 458 of a second. Common length relationships: 1 meter (m) = 100 centimeters (cm) = 1000 millimeters (mm) 1 kilometer (km) = 1000 meters Relationship between metric and English systems: 1 inch (inch) = 2.54 cm Copyright © 2016 Wiley & Sons , Inc. All rights reserved.

A. You must complete the following steps to receive full credit. 1. Write down what you know. 2. Write down what you don’t know. 3. Write a plan on how to get the unknown from the known. 4. Write the conversions you will use. 21/9/2018 21:43

A. You must complete the following steps to receive full credit. 5. Complete the chart. Draw a table based on the following: 1 column for unknowns 1 column for each exchange 1 column for unknowns 2 rows in each table 21/9/2018 21:43

A. You must complete the following steps to receive full credit. 5. Complete the table Known_Unit (Given) Conversion of Unknown_Units (Answer) Unknown_Unit (Answer) Conversion of Known_Units (Bate) 9/21/2018 9:43 PM

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6. How do you know what is happening above in the conversion column? Your unit starts with them down. units

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