Measurement and Significant Figure Lab

Part 3: Calculate density of a metal an unknown metal. 1. Using the pictures below, record the displayed data in the data table in the report sheet. Make sure to include the right number of significant figures in the measurements and calculations. Mass measurement 7.1 g Volume of water measurement. There's only one measurement here – the larger image is for magnification only. -20 15 m Volume of water and metal measurement. There's only one measurement here – the larger image is for magnification only. 20 m 15

Part B Gather all of your pennies dated before 1982. Then follow the steps to complete the table. Include units as necessary. Record the number of pennies dated before 1982. Weigh (as a group) the pennies dated before 1982. Record the total mass. If you’re unfamiliar with using an electronic balance, watch this video before continuing. Calculate and record the average mass of a single penny. If you need help with the calculation, visit the averaging data section of the math review. number of pennies: 8 combined mass of the pennies (g): 49.2 average mass of a penny (g): 5.525 Part C Now gather all of your pennies dated after 1982. Complete the table for the post-1982 pennies using the same steps from part B. number of pennies: 9 combined mass of the pennies (g): 51.7 average mass of a penny (g): 5.744 Part D In parts B and C, you measured the average mass of each group of pennies. Now you’ll measure their volume. (For this part, assume that the pennies dated before and after…

Part B Gather all of your pennies dated before 1982. Then follow the steps to complete the table. Include units as necessary. Record the number of pennies dated before 1982. Weigh (as a group) the pennies dated before 1982. Record the total mass. If you’re unfamiliar with using an electronic balance, watch this video before continuing. Calculate and record the average mass of a single penny. If you need help with the calculation, visit the averaging data section of the math review. number of pennies: 8 combined mass of the pennies (g): 49.2 average mass of a penny (g): 5.525 Part C Now gather all of your pennies dated after 1982. Complete the table for the post-1982 pennies using the same steps from part B. number of pennies: 9 combined mass of the pennies (g): 51.7 average mass of a penny (g): 5.744 Part D In parts B and C, you measured the average mass of each group of pennies. Now you’ll measure their volume. (For this part, assume that the pennies dated before and after…

2. Calculate the circumference. Diameter of watch glass was 10.2cm

Expressing Errors in Measurement: Scientists often express their uncertainty and error in measurement by giving a percent error. The percent error is defined as: % error actual value - measured value x 100 actual value Answer the following four questions. Pay attention to significant figures, and show your work! 1. While doing a lab, a student found the density of a piece of pure aluminum to be 2.85 g/cm°. The accepted value for the density of aluminum is 2.70 g/cm³. What was the student's percent error? 22.70 26 Demystifying Scientific Data: RET 2006, Rev 2

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For each of these problems, set up the calculation as described in your worksheet, using the proper conversion factor(s), and give the answer with the appropriate units and number of significant figures. Use scientific notation where appropriate. 1. Convert 5.89 inches into centimeters.

2. For this question you'll need to perform calculations for the data listed below. Imagine you performed the same set of measurements as the instructor did in the video using a 10-mL graduated cylinder. Be sure to show your calculations on this sheet. density of water 0.995124 g/ml mass of empty flask mass of flask + water 24.3165 g, 34.3175 g. 44.1982 g. 54.1597 g. 64.1712 g. 74.2704 g. 84.2420 g. 94.6730 g. 103.9727 g. 114.7728 g 15.5552 g (10 runs) a. Calculate the mean volume of water for the graduated cylinder data above. b. Calculate the standard deviation for the volume of water for the graduated cylinder data typed up above on this page. c. Calculate the standard error for the volume of water for the graduated cylinder data typed up above on this page.

Fill up the missing data

Leaming Goal: To learn how to round an answer to the correct number of significant figures. Multiplication and division When multiplying or dividing, the final answer is rounded to the same number of significant figures as the measured number with the fewest significant figures. When we report a measurement in science, we are careful to report only digits known with certainty, plus a final digit that is recognized to be uncertain. We call this set of digits significant figures. Often, these numbers are used in calculations. When we use a calculator, the calculator does not automatically account for significant figures, so we have to do so ourselves. There are some basic rules for handling significant figures in calculations as shown in the table and outlined to the right. Addition and subtraction When adding or subtracting, the final answer is rounded to the same number of digits to the right of the decimal point as the measured number with the fewest digits to the right of the decimal…

4. When you get your 5th correct answer, you will get a certificate that you can share with your teacher letting your teacher know how you did. Please provide a screenshot of your certificate showing you got this completed. DATA Part B: Measuring the Mass of Materials Top Loading Balance Mass Empty Beaker (g) Mass of Beaker + Paper Clips (g) Mass of Paper Clips (g) Analytical Balance Mass of Empty Beaker (g) Mass of Beaker + Paper Clips (g) Mass of Paper Clips (g) DATA ANALYSIS: 1. Show your calculation for the mass of paper clips using the top-loading and analytical balances. 2. Which of the balances, top-loading or analytical, has the most uncertainty per measurement? Explain. Page 10 of 14

please help with all the parts in this question, it is practice so I want to have all the parts to study

CHE 100-Lab 1 - Measurement Background Reference: Openstax - Chemistry, Atoms First, 2e Section 1.4 - measurement units, derived units, density, water displacement method Section 1.5 - measurement uncertainty, number of digits Chemlibre - Basics of GOB Chemistry (Ball) Section 1.5-measurement uncertainty, number of digits Chem Libre - Chemistry for Allied Health (Soult) Section 1.2-measurement uncertainty, number of digits CHE100 Video Tutorials Measurement units, measurement uncertainty and "every digit is certain, except for the last one" rule. Materials Needed: Electronic balance, beakers (10,50,250 mL), graduated cylinder (100 mL), volumetric flask (50 cylinders. mL), water, household item that will sink in water and fit in one of the beakers or graduated Procedure: 1. Water density (different quantities of water) a. Determine the mass (grams) and volume (mL) of a sample of water using each type of glassware below. For the volume measurement, report the values with the correct…

No need to explain. Just give the answers directly. Thank you. 1. Round off 1.274 to one (1) significant figure 2. Round off 1653 to one (1) significant figure 3. Round off 534.5 to three (3) significant figures

An electric current of 155.0 mA flows for 42.0 minutes. Calculate the amount of electric charge transported.. Be sure your answer has the correct unit symbol and 3 significant digits. 0 x10 μ 0 9 X

55. Round the number on the left to the number of significant figures indicated by the example in the first row. (Use scientific notation as needed to avoid ambiguity.) Rounded to Rounded to Rounded to 4 Significant 2 Significant 1 Significant Figures Number Figures Figure 1.45815 1.458 1.5 8.32466 84.57225 132.5512

Convert 75 miles into meters. (Use the conversion 1.0 km = 0.621 miles and use metric conversions for the rest of the conversions).

It was still incorrect please solve it again.

Why should the selected rule(s) be followed? Weighing wet items will cause the displayed mass to be greater than the actual mass of the object. A residue left on the balance will contaminate the balance pan surface and anything that comes into contact with it afterwards. Objects at any temperature other than room temperature can create air currents which can affect the balance pan, causing the measured mass to be higher or lower than the true mass. There may be discrepancies in accuracy between individual balances.

Question 40- (PLEASE LOOK AT THE ATTACHED IMAGES TO SOLVE FOR THIS QUESTION, Also, PLease show your work and explain your answer so I can understand going forward.) Report the following volume measurement to the correct number of significant figures. (LOOK AT ATTACHED IMAGES TO SOLVE THIS QUESTION)

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(SHOW CALCULATIONS) The mass of a sample is 8.2 x 10-2 milligrams. Express that mass in kilograms with the proper number of significant figures. In your calculations, be sure to show the conversion factor.

PART 3 A Volumetric Flask + A С — ALI50 SOA A 50-mL volumetric flask measures a volume of 50.00 mL. In this experiment, we want to show that this is true. 50.00 mL is the actual volume measured by this volumetric flask. EXPERIMENT: The mass of an empty volumetric flask is measured. Then water is added to the volumetric flask and the meniscus is adjusted to be at the correct level. Then the mass of the volumetric flask and the water is measured. Finally, the temperature of the water in the volumetric flask is measured. RESULTS: Mass of empty volumetric flask = 37.04 g Mass of volumetric flask and water = 86.83 g Temperature of the water in the volumetric flask = 23°C 4 Densities of water at different temperatures: Density of Water at Different Temperatures (g/cm) Temp, °C Density Temp, °C Density Temp, °C Density 18 0.99862 21 0.99802 24 0.99733 19 0.99844 22 0.99780 25 0.99708 20 0.99823 23 0.99757 26 0.99681 (a) Using the mass of the water measured and the density of the water,…

Complete the following addition/subtraction calculations. Report your final answer to the correct number of significant figures and units. 14.62 g+ 0.1338 g 359.6+56.07 - 1088 367.2580 g - 80.4 g VI. Complete the following calculations. Report your final answer to the correct number of significant figures and units. 6.8 cm x 0.290 cm