Water hardens experiment: Results: Sample A: 426.3 ppm Sample B: 18.9 ppm Sample C: 354.9 ppm Based on the results of water samples A, B, and C. Based on the results, where did you think each sample came from? Justify your answer. The choices are: 1)Tap water 2)Water from the fountain filter 3)Distilled water 4)Water treated by a water softener 5)Water filtered by a water pitcher filter 6)My tap water tested by the Culligan Water Company was 350 ppm CaCO3.

Water hardens experiment: Results: Sample A: 426.3 ppm Sample B: 18.9 ppm Sample C: 354.9 ppm Based on the results of water samples A, B, and C. Based on the results, where did you think each sample came from? Justify your answer. The choices are: 1)Tap water 2)Water from the fountain filter 3)Distilled water 4)Water treated by a water softener 5)Water filtered by a water pitcher filter 6)My tap water tested by the Culligan Water Company was 350 ppm CaCO3.

Chemistry & Chemical Reactivity

9th Edition

ISBN:9781133949640

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

ChapterL: Let's Review

SectionL.2: Making Measurements: Precision, Accuracy, Experimental Error, And Standard Deviation

Problem 1CYU: Two students measured the freezing point of a sample of pure benzene. Student A used an ordinary...

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Two students measured the freezing point of a sample of pure benzene. Student A used an ordinary laboratory thermometer calibrated in 0.1 ℃ units. Student B used a thermometer certified by NIST (National Institute of Standards and Technology) and calibrated in 0.01 °C units. Their results were as follows: Student A: 52 °C, 5.7 °C, 5.5 °C, 5.2 °C Student B: 5.48 °C, 5.52 °C, 5.50 °C, 5.54 °C Calculate the average value for A and B and, knowing the freezing point of benzene is 5.50 °C (and using kelvins for temperature), calculate the percent error for each student. Which student has the smaller error?
Althea extracted 2g of pure dry salt frame 6g of rock salt. The mass of the salt obtained is less than the mass of rock salt because the rock was removed by ______?a dissolvingb. distillationc. evaporationd. decantation5. A mixture of different colored inks can be separate using ______?a. chromatographyb. distillationc. evaporationd. distillation6. what is one property of a suspension that is different from that of a solution or colloid?a. the particles of a suspension will settle down upon long standing.b. the particles of a suspension reflect light.c. A suspension is always clear.d. A suspension is colorless.
a sample of sodium carbonate Na2CO3 is being dried. after 1 hour of drying the mass of the sample was 0.337g. after an additional 30 minutes of drying the mass of the sample is 0.333g what is the percent change between the first and second measurement? if to be considered dry two consecutive measurements must have a percent change of less than or equal to plus or minus 1% is the sample dry?
An infant ibuprofen suspension contains 100 mg per 5.0 mL suspension. The recommended dose is 10 mg of ibuprofen per kg body weight. If, your child weight 46.31 lbs, how many teaspoons (tsp) should you give your child? Note that 1 lb = 453.59 g and 5 mL = 1 tsp.
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INSTRUCTIONS: SOLVE FOR THE FOLLOWING PROBLEMS. SHOW YOUR COMPLETE SOLUTION & THE CANCELLATION OF THE UNITS OF MEASUREMENT. BOX AND HIGHLIGHT YOUR FINAL ANSWER. LABEL YOUR FINAL ANSWER. OBSERVE THE CORRECT WAY OF COMPUTING. ROUND-OFF YOUR FINAL ANSWER INTO THE FOLLOWING: WEIGHT = 4 DECIMAL PLACES VOLUME = 2 DECIMAL PLACES DENSITY, SPECIFIC GRAVITY & SPECIFIC VOLUME= 4 DECIMAL PLACES 1. If 150 mL of polyethylene glycol has a density of 1.1333 g/ml. What will be its weight?
In lab, you determine that the mass of a Florence flask and a piece of aluminum foil weigh 39.862 g. After performing the experiment on an unknown, you find that the flask, foil, and condensed vapors weigh 40.572 g. The flask was removed at 98.3oC when all the liquid was vaporized. At the end of the experiment you place the Florence flask and foil on the balance, fill the flask with water at 20.2∘ C, and find a mass of 165.033 g. If the current barometric pressure is 756 torr, what is the molar mass of your unknown? Report your answer to one place after the decimal.
Jervin tested how much water a paper towel could absorb in an experiment. He found out that a single paper towel might first absorb 12.8g of water. He later discovered that his scale was not calibrated; thus, the experiment had to be repeated. He found that one paper towel could absorb 32.9g of water after repeating the experiment on a different scale. What is the approximate error between the first and second experiments' results?
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A urinometer is a hydrometer used to measure the specific gravity of a sample of urine. What is the density of urine sample that has a specific gravity of 1.012? Concentrated urine (Hyposthenuria) What is the mass of a 5.00-mL urine sample with a specific gravity of 1.012? (M = 5.06 g) 1.014g/ml
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Mary experimentally determines the boiling point of ethanol to be 72.2°C when it is actually 78.2°C. Determine both the experimental error and the percent error for Mary's experiment.