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Metric Measurement and Conversion Lab Purpose: In this lab session, you will learn how to use instruments to make quantitative observations and apply metric conversions. Directions: Working with a partner, move to each station and answer the questions on a sheet of paper. Be sure to include all units and properly label each station. Station 1 Length: 1. Find the length of the room in meters. _______________________m 2. Convert the length to centimeters, then kilometers. ______________________cm ___________________km 3. Find the width of the room in meters. ___________________m 4. Convert the width to cm, then kilometers. ______________________cm ___________________km 5. Find the area of the floor in the room in square meters, then square centimeters. Area = length x width _____________________m2 = ___________________cm2 Station 2 Mass: 1. Find the mass of object A in grams using the electronic balance. Then convert to kilograms and milligrams. ______________g _______________mg ______________kg 2. Find the mass of object B in grams using the electronic balance. Then convert to kilograms and milligrams. ______________g _______________mg ______________kg Station 3 Volume: 1. Find the volume of object A in cubic centimeters. L x W x H __________________cm3 Measuring volume by displacement: -If you have an irregularly shaped object and you would like to know the volume of this object, you can do so by displacement. To do this: a. Use a graduated cylinder that has a larger opening than the size of the object. b. Fill the graduated cylinder ½ full of tap water. Record the volume of water in the cylinder. c. Now tilt the graduated cylinder and slowly slide the object into the water. Be careful not to splash. d. Now record the volume of the water + object. e. To determine the volume of the object, all you have to do is subtract the 2 pieces of data collected. 2. Find the volume of the marble in milliliters and then covert to cubic centimeters. 1 ml = 1 cm3 Volume before the marble _____________ml marble _______________ml Volume after the Volume of the marble _______________ml =______________cm3 3. How much liquid is the graduated cylinder holding? ____________________________________ml Station 4: Measuring Temperature 1. What is the temperature of the water in the beaker? ____________°C 2. What is the temperature of the water in the beaker on the hot plate? ____________°C 3. What is the difference in temperature? ____________°C Convert the difference to Fahrenheit ___________________°F 9 F C 32 5 Station 5: Length Using a metric ruler: Record the length of your right index finger. Record the length in millimeters. (You should have 2 decimal places in your answer) Length of right index finger: _________mm=_______________cm = _____________dm Using a meter stick determine your height in centimeters. Record your height in meters. Height: __________________ cm= ______________________m Station 6: Reading Graduated Cylinders Reading Instruments to the correct number of significant figures. When reading instruments, you need to record the reading to the correct number of significant figures. What this means is that you are to record your answers so that you record all numbers you are sure of in the measurement, plus you are allowed one guess. If the measurement appears to be on a line, then the last figure written should be a zero. 1. To the right are sections of graduated cylinders with water in them. The units for all of the measurements are milliliters. 2. Read each graduated cylinder and record the measurement to the correct number of significant figures. Always state the figures you are sure of, plus one guess. 3. Make sure you record your measurements using the proper units. 4. Each of the graduated cylinders may be different from each other. Station 7: Reading a Triple Beam Balance Reading a balance: Below are 2 different types of balances. Record the mass for each balance to the proper number of significant figures. Make sure you use grams for your units. Station 8: Practicing Scientific Notation and Sig. Figures Convert the following numbers to/from scientific notation: 1.) 2.) 3.) 4.) 5.) 93,000,000,000 6.57 x 10-5 3.11 x 106 0.0003549 315,200 Solve the following problems to the correct number of sig. figs. 6.) 0.030210 x 2.56 = 7.) 5.21 x 0.31 = 8.) 10.12 – 6 = 9.) 15.1537 + 0.021 = 10.) 200 ÷ 15 = Discussion Questions 1. Why is it important to use correct significant figures when recording measurements in a lab? 2. Look at the picture below. According to this picture, what is the length of the bolt in centimeters? How many significant figures should your answer have? Explain to me why that is a correct measurement. 3. A man in front of you at Hobby Lobby is complaining to the check-out clerk because he asked for 1.75m of fabric to be cut but instead got 175cm. Does he have a valid complaint? Why or why not? 4. You use a balance in the lab to record the mass of a beaker. The balance gives you a readout of 163.6 grams. You write this down and move on with the experiment. Later on in the lab you measure the beaker's mass again, but this time the scale gives you a readout of 166.3 grams. You assume that you must have misread the instrument the first time. But is there an alternate plausible conclusion? If so, what could it be?