Chemistry Lab Techniques and Measurement

Experiment #1

Laboratory Techniques and Measurement

PURPOSE

The purpose of this laboratory is to become familiar with measurements, materials, calculations, conversions, and procedures used in chemistry lab.

DATA

1. Length Measurements

Object Centimeters Millimeters

a. Pencil 10.5 cm 105 mm

b. Checkbook 14.2 cm 142 mm

c. Wallet 11.7 cm 117 mm

2. Warm Temperature Measurements

Item Temperature

a. Tap water 40 Celsius

b. Boiling water 97 Celsius

3. Cold Temperature Measurements

Item Temperature

a. Tap water 14 Celsius

b. Ice water 0 Celsius

4. Volume Measurements

Item Measurement

a. Test tube 10 mL

b. Pipet 4 mL

28 drops in 1 mL

5.

6. Density Measurements

Item Measurement

i. 25 mL graduated cylinder 16.5 g

ii. 25 mL cylinder with 5 mL water 21.5 g

iii. 5 mL water 5.00 g

iv. Density of water 1.00 g/cc

v. Mass of 5mL alcohol 4.70g

vi. Density of 5mL alcohol 0.94 g/cc

vii. Mass of 5mL saturated solution and graduated cylinder 22.4 g

viii. Mass of saturated solution 5.8 g

Density should be greater than density of water

ix. Density of saturated solution 1.16 g/cc

x. Mass of bolt 8.00 g

xi. Mass of half-full beaker 94.6 g

xii. Volume of bolt 1.10 cc

xiii. Density of bolt 7.27 g/cc

xiv. Mass of magnet 4.70 g

xv. Volume of magnet 2.00 cc

xvi. Density of magnet 2.35 g/cc

xvii. Dropped to bottom 4.50 cc

xviii. Volume of magnet l/w/h 2.60 cm x 0.50 cm x 0.50 cm = 0.65 cc

xix. Density of magnet 7.23 g/cc

The two density measurements are not similar at all. I believe the second measurement is more accurate, because the measurements are more exact. Holding the magnet on a string in the water depends greatly upon how low into the water you place it, how much your hand moves, and whether or not you accidentally hit the side.

A.What is the relationship between mL and cm3?

They are identical measurements of volume.

B. Everyone knows that water is supposed to boil at 100° C. Why did your water sample

boil at a different temperature?

Experimental error accounts for measurements being different from standard expectations.

C.