Lab Measurements data and questions 1411

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Northwest Vista College *

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1402

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Chemistry

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Feb 20, 2024

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Lab: Measurements Data and Questions Name: Maranda Maldonado I. Measurements A. Temperature Obtain a Celsius thermometer and record the temperatures of the objects on the lab bench. Then convert your measurements to Fahrenheit. Record your measurements in the data table below. Table 1. Temperatures Item Temperature (°C) Temperature (°F) Boiling water 320 608 Ice water 0 32 Room temperature water 20 68 Body (underarm) 30 86 Conversion factors for converting from Celsius to Fahrenheit. °F = (temperature °C x 1.8) + 32 B. Mass 1.Look at list of target masses below and find objects that your group thinks have the same mass as the target mass. For example, a small rock that has a mass of 1 gram. 2.Write down your estimate of the mass in the table below. 3.Then mass the objects using the scale provided. Do not forget to tare (zero) the scale before you begin. a) How many objects did you correctly match the target mass to the actual mass? Why was it difficult? Just one, because we weren’t as experienced in guessing and properly measuring the mass of of objects. b) Which has more MASS - a kg of lead or a kg of feathers? Why? They would have the same weight but different mass because of how much density is packed into the lead C. Volume Target mass (g) Object Estimate of mass (g) Actual mass (g) 0.1 Pipette Holder 0.1 1.75 1.0 Stick 1.0 8.96 5.0 Bag of metal cubes 5.0 32.57 50 Broken chain link 50 33.41 100 2 bags of 14 metal cubes 100 96.9

In the table below, record the volumes of the three small objects that you determined by using displacement. Object name Original volume (mL) New volume (mL) Volume of object (mL) Screw 12 mL 13 mL 1 mL Washer 17 mL 19 mL 2 mL Metal U 14 mL 15 mL 1 mL Look at the images below and write in the correct measurement of volume. All measurements are in milliliters. D. Length Team data Team member Length of little finger (mm) Isabelle 50 Skylar 50 Luis 75 Maranda 65 Class data Length of finger (mm) Number of students Length of finger (mm) Number of students 50 3 63 1 55 3 64 1 56 1 65 1 57 1 67 1 6.4 mm 50.4 mm

59 1 70 1 60 4 75 1 62 1 Range of little finger lengths (mm) 25 mm Average length of little finger lengths (mm) 61.76 mm Precision & Accuracy of Various Measuring Devices ● Accuracy is how close the measurement is to the actual “true value” (i.e. You don’t use bathroom scales to measure blades of grass or elephants). ● Precision is the reproducibility or reliability of the measurement (i.e. did your bag of tomatoes at the store measure 1.24 pounds every time you weighed them?). 1. Different measuring devices have different degrees of precision. Most measuring devices show major gradations (lines) with numbers and minor gradations that indicate a portion of the space between two numbers. A device can only be used if it has gradations accurate enough for the measurement. a) How far apart are the numbers on the major gradations on a 100 ml graduated cylinder? b) How far apart are the numbers on the minor gradations on a 100 ml graduated cylinder? By 1’s By 10’s

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c) If you had to measure 60 ml, which pipette would you use - 1ml, 5 ml, 10 ml or 100 ml would you use? Why? 100 mL, because it’s the only one that had enough to measure the 60 mL 2. What are the major and minor markings on each of these pipettes? Pipette Major markings at Minor markings at 1 ml 1/10 1/9 5 ml 1 mL 1/10 mL 10 ml 1 mL 1/10 3. Would it be appropriate to use a 1 mL or a 10 ml graduated cylinder to measure 0.68 ml of water? Explain your reasoning. The 1 mL, since it can focus on the much smaller markings along the cylinder, whether major or minor.