# Chem 180 Lab

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• Published : April 7, 2013

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Although the world may disagree about many issues there is a commonality that continuously unites nations from all over the world, and it is a fundamental system in which the world cannot function without, the International System of Units (SI). The SI was established in 1960 by the 11th Conference of Weight and Measures; it began with 17 nations including the United States and today has become widely used among 51 nations (Historical). The SI is a metric system of units of measurement and is predominantly used in the scientific community to communicate and to be able to share research anywhere in the world. The SI system has common units such as; meters, kilograms, moles, seconds and Kelvins to measure length, mass, amount of substance, time and temperature (Historical). The SI system is very useful because it allows the world to communicate in a common language, without the system many tedious conversions would have to be made just to share knowledge throughout the world.

Purpose

While the SI system may be useful, it is useless without the knowledge of how to use it to make precise and accurate measurements. The objectives in the experiment are to learn how to use laboratory equipment to determine volume, mass and temperature. It is also important to learn how to combine units to determine concentration and density in order to measure the density and concentration in different dilutions.

Procedure
Exercise 1
Length Measurements
1)Gather DVD or CD, key, spoon and fork.
2)Measure the length of each item in centimeters with one degree of uncertainty, record. 3)Measure the length of each object in millimeters with one degree of uncertainty, record. 4)Convert measurements from millimeters to meters.

Temperature Measurements
5)Gather 100 mL glass beaker, lighter, cup, burner stand, burner fuel and a thermometer. 6)Turn the tap water to hot, wait 15 seconds then measure the fill the 100 mL beaker to 75 mL with hot tap water and measure the temperature in (˚C). 7)Place the beaker of water on the stand and put on safety goggles. 8)Light the burner and placed it under the burner stand.

9)When the water comes to a full boil measure the temperature with one degree of uncertainty. 10)Wait 5 minutes and take the temperature similarly to step 5. 11)Place the lid on the burner fuel to extinguish the fire. 12)Run tap water cold for 15 minutes, measure the temperature as before. 13) Get a cup and add ice, after one minute record the temperature and after five minutes record the temperature. Convert the temperatures to ˚F and K. Mass Measurements

14)Gather a pencil, a key, 5 pennies 4 quarters and 4 dimes 15)Estimate the masses of each object listed in Table 3.
16)Record the mass of the pencil and repeat for the remaining objects in Table 3.

Exercise 2
Volume and Density Measurements (Liquid)
1)Gather a graduated cylinder, short pipet and isopropyl alcohol 2)Record the mass of the graduated cylinder
3)Fill the graduated cylinder with 5 mL of distilled water using the short stemmed pipet 4)Place the filled graduated cylinder on the scale and record the mass 5)Calculate the mass of the water by taking the difference of the two masses 6)Repeat steps 2-5 for the isopropyl alcohol

7)Calculate the densities for each and find the percent error knowing that the density of water is 1 g/mL and the density of isopropyl alcohol is 0.786g/mL Volume and Density Measurements (Solids)

8)Gather the magnet, metal bolt, string, graduated cylinder, ruler, beaker and scale 9)Record the mass of the magnet and measure the length width and height in centimeters 10)Calculate the density by diving the mass by the volume

Water Displacement Method
11) Record the mass of the magnet
12)Fill the graduated cylinder with 7 mL and record the volume 13)Submerge the magnet into the water and record the volume, then calculate the density 14)Find volume by subtracting the final volume from...