Chapter 2

# Chapter 2 - Chapter 1 - Lecture 2 CHEM 1010 Agenda: In...

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Chapter 1 - Lecture 2 CHEM 1010 Agenda: In Class Quiz Review of Problems Temperature Conversions Accuracy and Precision Significant Figures Calculations Conversion Factors Problems

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Solutions to Selected Problems: 1.25 Volume of (a): Number of Sig Figs: Length of (b): Number of Sig Figs: How many milliliters of water does the graduated cylinder in (a) contain and how tall in centimeters is the paper clip in (b)?How many significant figures do you have in each answer?
Solutions to Selected Problems: 1.27 The following cylinder contains three liquids that do not mix with one another: water (density 1g/mL), vegetable oil (density = 0.93 g/mL) and mercury (density = 13.5 g/mL). Which liquid is which? Yellow: Green: Blue:

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1.49 What SI prefixes correspond to the following multipliers? 10 3 10 -6 10 9 10 -12 10 -2 1.56 Bottles of wine sometimes carry the notation “volume = 75 cL”. What does the unit cL mean? Solutions to Selected Problems: 1.49, 1.56
1.59 How many microliters are in 1L? In 20 mL? Solutions to Selected Problems: 1.59.

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Temperature Scales Temperature measures the degree of “hotness” of an object. There are three temperature scales in common use in the world today. Fahrenheit (°F) commonly used in the United States outside a laboratory setting. Celsius (°C) the metric temperature scale used in most other countries outside a laboratory setting. Kelvin (K) the SI base unit of temperature used in most laboratories.
Temperature Scales

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Converting between temperature scales Converting °F to °C : ( 29 F 9 C 5 F 32 - F C ? ° ° × ° ° = ° Converting °C to °F : ( 29 F 32 C C 5 F 9 F ? ° + ° × ° ° = ° Converting °C to K : ( 29 C 1 K 1 C 273.15 C K ? ° ° + ° =
Convert 172.9 ° F to degrees Celsius. ºC = x ( ° F – 32) 9 5 ºC = x (172.9 – 32) = 78.3 ºC 9 5 Example Temperature Conversion Convert 15 °C to °F . ( 29 F 32 C C 5 F 9 F ? ° + ° × ° ° = ° ( 29 F 59 F 32 C 15 C 5 F 9 F ? ° = ° + ° × ° ° = °

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Convert 23.10 °C to K . ( 29 C 1 K 1 C 273.15 C K ? ° ° + ° = ( 29 C 1 K 1 C 273.15 C 23.10 K ? ° ° + ° = K 296.25 K ? = Example Temperature Conversion
Temperature Challenge Liquid helium boils at 4.2 K. What is the boiling point of He in degrees Celsius? The Temperature of dry ice (solid Carbon dioxide) in ice cream vending carts is -78˚C. What is the temperature on the Fahrenheit and Kelvin scales.

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Used to express very large or very small numbers easily and with the correct number of significant figures. Represents a number as a power of ten.
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## This note was uploaded on 10/25/2011 for the course CHEM 1010 taught by Professor Olga during the Spring '11 term at UOIT.

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Chapter 2 - Chapter 1 - Lecture 2 CHEM 1010 Agenda: In...

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