CHEM 0010 Unit


UNIT # 1
Introduction
Objectives
Reading
1.1 Metric System 1.2 Temperature Measure- ments 1.3 Scientific Notation 1.4 Dimensional Analysis 1.5 Precision, Accuracy, Uncertainty 1.6 Significant Figures 1.7 Calculations Involving Significant Figures 1.8 Density 1.9 Specific Gravity
Problems 1 \| 2 \| 3

MEASUREMENT

1.8 - Density

1.8.1 - Density and Temperature

Density is temperature dependent (i.e. - it varies with temperature).

eg - Mercury

Temperature Density Notation

at 20^oC 13.55 g/mL = 13.55 g/mL

at 270^oC 12.95 g/mL = 12.95 g/mL

Compare the densities of some common materials:

Material Density at room temperature

Solid:

Aluminum 2.70 g/cm³

Lead 11.4 g/cm³

Liquid:

Gasoline 0.67 g/mL

Mercury 13.55 g/mL

Water 1 g/mL

Gas:

Air 1.3 g/L

Chlorine 3.17 g/L

When mercury, gasoline and water are mixed at room temperature, we would observe three layers because these liquids are immiscible. Look at the densities of these liquids given above, can you predict the order of these layers?

Section 2.8
Dimensional Analysis Method of Problem Solving for Conversions ..p33

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