- Laboratory 1b Worksheet Exercise A Measurement Of Distance Laboratory Width M Calculate Approximate Area Width M X 1 (50.59 KiB) Viewed 105 times
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LABORATORY 1B WORKSHEET Exercise A - Measurement of distance Laboratory width: m Calculate approximate area: width, m x length Paper width: cm Paper length: cm Calculate approximate area: width cm x length cm = Paper hole diameter: mm Your height: cm, which is equal to m Indicate which metric unit of length you would use to measure the following: length of a fork width of a plant cell size of a small pea length of your car height of a refrigerator_ distance to the beach diameter of an apple. size of a dust particle Exercise B-Measurement of volume Volume of fluid in Beaker A=. ml Volume of fluid in Test Tube B = Exercise C-Measurement of mass Mass of Graduated Cylinder=_ g Mass of Graduated Cylinder with 50 ml of water - Mass of 50 ml of water: g Difference between calculated and actual mass of 50 ml of water: Mass of 1 ml of water based on your measurements: Mass of Large Paper Clip = Name Section Laboratory length: m = ml g/50 ml = m cm² g/ml C
Exercise D-Measurement of temperature Ambient temperature in lab °C ice water °C Convert the following temperatures using the formulas on page 10 of the lab exercises: Mild temperature: 72 °F= °C 98.6 °F= Body temperature Very hot day Cold day 10 °C=_ °F 34 °C= Exercise E-Converting from decimal notation to exponential notation Convert the following decimal numbers to exponential numbers: 186,000 = = 0.00018 32.9= -0.0369 700.02 = = 0.00000025 Exercise F-Converting from exponential notation to decimal notation Convert the following exponential numbers to decimal numbers: 3.7 x 10³ 106 1.01 x 107 - 2.818 x 10³ 4.0103 x 10¹ = 8 x 10² Exercise G-Metric conversions Convert the following measurements to the indicated unit: 335.9 g. kg 0.00939 μl ml 456.82 ng 20 megabytes = 8 megabase pairs (mbp). 95 °C- °F Hg kilobytes kbp boiling water °C °C °F m = 0.0886 km kg = 89 mg dl= 900.5 cl jum mm °C 0.37 mm 11.5 nm 100 °F
Exercise A - Measuring distance 1. Obtain a wooden meter stick. If you look on the back of the meter stick, one meter is approximately 39 inches or about 3 inches longer than one yard (36 inches). Using the meter stick, estimate the size of the laboratory by measuring its width and length to the nearest meter. 2. Observe that the meter is divided into 100 equal units called centimeters. A centimeter is about the width of a small finger. Using the meter stick, estimate the dimensions of a regular piece of notebook paper to the nearest centimeter. 3. How tall are you? Go over to the medical weight and height scale to measure how tall you are to the nearest centimeter. 4. Next, obtain a small plastic metric rule. Observe that each centimeter is divided into 10 small units called millimeters. A millimeter is about the thickness of a fingernail. Using the small plastic ruler,; estimate the diameter of a hole on a regular piece of notebook paper to the nearest millimeter.
Exercise B- Measuring volume 1. Obtain a one liter (L or 1) beaker. One liter is equal to 1,000 cubic centimeters (cc = cm³ = milliliter ml). Fill the beaker with one liter of water. To do this, add water until the meniscus (top level of the water) reaches the 1 liter marker on the beaker. Pour the water into a 2 liter soda bottle. Once again, fill the beaker with one liter of water by adding water until the meniscus reaches the 1 liter mark. Pour the water into the 2 liter soda bottle. Once again, fill the beaker with one liter of water by adding water until the meniscus reaches the 1 liter mark. Over the sink, add the 1 liter of water to the 1 quart container provided. Notice that 1 liter is just a little bit more than 1 quart. In fact, 1 liter = 1.057 quarts. 2. One way to measure the volume of a fluid in a laboratory is to use a graduated cylinder. Whereas beakers are generally used to hold fluids, graduated cylinders are used to accurately measure volumes. Obtain a 50 milliliter (ml) graduated cylinder. Fill the graduated cylinder with water until the meniscus reaches the 50 ml mark. Add the water to a 1 liter (1,000 ml) beaker. Notice that 50 ml is equal to 1/20th of a liter. Next, measure the fluid in the flask labeled "A" to the nearest 0.1 ml.
Exercise C-Measuring mass A balance scale is used to measure the mass of a sample in grams (g). CHAUS 1. Place an empty 50 ml graduated cylinder on the balance and determine its mass in grams. 2. Next, fill the graduated cylinder with 50 ml of water and measure the mass of both the cylinder and the water. From this value subtract the mass of the cylinder to get the mass of the water. By definition, one gram is the mass of exactly 1.0 ml of water, thus 50 ml of water has a mass of 50.0 grams. How far off was your measured mass from the true mass of 50 ml of water? 3. Next, take a large paper clip and place it on the balance and determine its mass in grams.
Exercise D- Measuring temperature The metric unit for temperature is "Celsius (°C). Water freezes at 0 °C and boils at 100 °C. Note that this is much easier to remember than the corresponding values of 32 °F and 212 °F. 1. Use a thermometer to measure the following in degrees Celsius: A) the ambient temperature of the lab B) a bucket of ice water C) a beaker of boiling water 2. Convert the temperatures on your worksheet from °C to °F or °F to °C with the following formulas: °C 5/9 x (°F-32) = °F (9/5 x °C) + 32 =