Chapter 1 Chemistry and Measurements 1 1 3

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Chapter 1 Chemistry and Measurements 1 1. 3 Units of Measurement Chemistry: An Introduction

Chapter 1 Chemistry and Measurements 1 1. 3 Units of Measurement Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

Units of Measurement 2 Scientists use the metric system of measurement and have adopted

Units of Measurement 2 Scientists use the metric system of measurement and have adopted a modification of the metric system called the International System of Units as a worldwide standard. International System of Units (SI) is an official system of measurement used throughout the world for units in length, volume, mass, temperature, and time. Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

Units of Measurement, Metric and SI 3 Chemistry: An Introduction to General, Organic, and

Units of Measurement, Metric and SI 3 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

Length, Meter (m) and Centimeter (cm) 4 1 m = 100 cm 1 m

Length, Meter (m) and Centimeter (cm) 4 1 m = 100 cm 1 m = 39. 4 in. 1 m = 1. 09 yd 2. 54 cm = 1 in. Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

Volume, Liter (L) and Milliliter (m. L) 5 1 L = 1000 m. L

Volume, Liter (L) and Milliliter (m. L) 5 1 L = 1000 m. L 1 L = 1. 06 qt 946 m. L = 1 qt We use graduated cylinders to measure small volumes. Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

Mass, Gram (g) and Kilogram (kg) 6 1 kg = 1000 g 1 kg

Mass, Gram (g) and Kilogram (kg) 6 1 kg = 1000 g 1 kg = 2. 20 lb 454 g = 1 lb The mass of a nickel is 5. 01 g on an electronic scale. Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

Temperature, Celsius (o. C) and Kelvin (K) 7 Water freezes: 32 o. F 0

Temperature, Celsius (o. C) and Kelvin (K) 7 Water freezes: 32 o. F 0 o. C The Kelvin scale for temperature begins at the lowest possible temperature, 0 K. A thermometer is used to measure temperature. Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

Time, Second (s) 8 The second is the correct metric and SI unit for

Time, Second (s) 8 The second is the correct metric and SI unit for time. The standard measure for 1 s is an atomic clock. A stopwatch is used to measure the time of a race. Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

Learning Check 9 What are the SI units for the following? A. volume B.

Learning Check 9 What are the SI units for the following? A. volume B. mass C. length D. temperature Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

Solution 10 What are the SI units for the following? A. The SI unit

Solution 10 What are the SI units for the following? A. The SI unit for volume is the cubic meter, m 3. B. The SI unit for mass is the kilogram, kg. C. The SI unit for length is the meter, m. D. The SI unit for temperature is Kelvin, K. Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.