Concept explainers
You set out to determine the density of lead in the laboratory. Using a top loading balance to determine the mass and the water displacement method (Study Question 41) to determine the volume of a variety of pieces of lead, you calculate the following densities: 11.6 g/cm3, 11.8 g/cm3, 11.5 g/cm3, and 12.0 g/cm3. You consult a reference book and find that the accepted value for the density of lead is 11.3 g/cm3. Calculate your average value, percent error, and standard deviation of your results.
Interpretation: The average, percent error and standard deviation has to be calculated.
Concept introduction:
Precision: Is a measurement indicates how well several determination of the same quantity agree.
Accuracy: Is the agreement of a measurement with the accepted value of the quantity.
Percent error: The difference between measured result and the accepted value.
Answer to Problem 62RGQ
The average value is
The percent error obtained is
The obtained Standard deviation is
The average value, percent error and standard deviation is calculated as,
Explanation of Solution
Average density Value:
Hence, the average density value is obtained as shown above. Hence, the average value is
Percent error:
From the above calculation, the percent error is obtained as shown above.
Standard deviation:
The obtained Standard deviation is
The average value was calculated as
The percent error obtained was calculated as
The obtained Standard deviation was calculated as
Want to see more full solutions like this?
Chapter 1 Solutions
Chemistry & Chemical Reactivity
Additional Science Textbook Solutions
Chemistry In Context
Chemistry: The Central Science (13th Edition)
Chemistry
Chemistry: The Central Science (14th Edition)
Organic Chemistry (9th Edition)
- Vanadium metal is added to steel to impart strength. The density of vanadium is 5.96 g/cm3. Express this in SI units (kg/m3).arrow_forwardAlthough the preferred SI unit of area is the square meter, land is often measured in the metric system in hectares (ha). One hectare is equal to 10,000 m2. In the English system, land is often measured in acres (1 acre = 160 rod2). Use the exact conversions and those given in Exercise 47 to calculate the following. a. 1 ha = __________ km2 b. The area of a 5.5-acre plot of land in hectares, square meters, and square kilometers c. A lot with dimensions 120 ft by 75 ft is to be sold for 6500. What is the price per acre? What is the price per hectare?arrow_forwardEquivalency, conversion factor, solving quantitative problems, analyze, identify, construct, check.arrow_forward
- Which of the following represent physical properties or changes, and which represent chemical properties or changes? You curl your hair with a curling iron. You curl your hair by getting a “permanent wave” at the hair salon. Ice on your sidewalk melts when you put salt on it. A glass of water evaporates overnight when it is left on the bedside table. Your steak chars if the skillet is too hot. Alcohol feels cool when it is spilled on the skin. Alcohol ignites when a flame is brought near it. Baking powder causes biscuits to rise.arrow_forwardYou receive a mixture of table salt and sand and have to separate the mixture into pure substances. Explain how you would carry out this task. Is your method based on physical or chemical properties? Explain.arrow_forwardGiven the two liquids, gasoline (d = 0.70 g/mL) and chloroform (d = 1.5 g/mL), how could you identify each liquid given a beaker of water and the two liquids?arrow_forward
- if oil is placed in a large body of water, such as a lake or ocean it spreads out to form a surface monolayer one molecule thick. 0.10mL of oil will spread out over a roughly 40 square meters area. Given 1 L= 1000mL= 0.001 m^3. Volume = area x height. Given this information, calculate the average diameter of an oil molecule in nanometers. 1 nanometer= 10^-9 meters.arrow_forwardtion 24 of 27 An empty beaker weighs 31.99 g.31.99 g. When completely filled with water, the beaker and its contents have a total mass of 405.55 g.405.55 g. What volume does the beaker hold? Use ?=1.00 g/mLd=1.00 g/mL as the density of water. volume: mLmL How much would the beaker and its contents weigh if it was completely filled with mercury? The density of mercury is ?=13.5 g/mL.d=13.5 g/mL. total mass:arrow_forwardIn the movie, "Raiders of the Lost Ark", Indiana Jones takes a gold idol from a cave. The statue is resting on a table which is rigged with a weight sensor. The weight sensor can detect when the weight is removed and will set off a series of unfortunate accidents. To prevent this from happening, Indiana replaces the gold idol with a bag of sand. The volume of the gold idol is approximately 1.0 L. The density of gold is 19.3 g/mL and the density of sand is 2.3 g/mL. 1. a. Assuming the idol is pure gold, what volume would the bag of sand have to be in order to weigh exactly the same as the idol and not set off the booby-traps? b. Let’s assume that Indiana is successful in removing the idol and returning with it to his laboratory. He decides to determine if it is really pure gold. He weighs the idol and measures the volume by a water displacement method. The results are: mass = 16.5 kg and volume of water displaced = 954 mL. Is the idol made of pure gold? Explain your answer based on…arrow_forward
- 1) State your interpretation of the meaning of the slope for the first graph you prepared of Volume of Steel Nuts (mL) versus Number of Steel Nuts. Hint: Understanding the meaning of a slope involves several factors: the units which are a ratio of the y axis units over the x axis units, the interpretation of the slope as “number of the y axis units for every one of the x axis units” and the concept that constructing the best line or curve that follows the trend in the data is a sort of averaging of the random error throughout the data.arrow_forwardState the rules governing the use of significant figures in Adding/subtracting measurements. How does this compare with multiplication/division of measurements? Please cite an example of the rule governing addition or subtraction.arrow_forwardFill in first the missing part of this equation using a UNIT RATIO. * For example, converting m to cm would require multiplying by the unit ratio: (1cm)/(10-2 m)arrow_forward
- Chemistry & Chemical ReactivityChemistryISBN:9781337399074Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage LearningIntroductory Chemistry: A FoundationChemistryISBN:9781337399425Author:Steven S. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage Learning
- Introductory Chemistry: An Active Learning Approa...ChemistryISBN:9781305079250Author:Mark S. Cracolice, Ed PetersPublisher:Cengage LearningChemistry: Matter and ChangeChemistryISBN:9780078746376Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl WistromPublisher:Glencoe/McGraw-Hill School Pub Co