15. In preparing a certain ointment, a pharmacist used 28.35 grams of zinc oxide instead of the 31.1 grams called for. Calculate the percentage of error on the basis of the desired quantity.

Q: What is one example of systematic error that can occur in an experiment and one example of random…

A: The difference between true value and an measured value of an experiment is known as errors. If any…

Q: (i) The maximum error in each mass measurement using the balance is ±0.005 g. Calculate the…

A: Cr=19.5152=0.375Cl=39.9635.5=1.126H=4.511=4.51O=36.0216=2.25Whole No. ratios,Cr=1Cl=3H=12O=6So the…

Q: density of irregular solid mass of irregular solid 9.039 g initial volume 68 mL final volume 74…

A: Given , Mass of irregular solid = 9.039 g Initial volume = 68 mL Final volume = 74 mL Total volume…

Q: What is the percent error? And how do I find it with the information provided.

A: Percent error or percentage error expresses as a percentage the difference between an approximate or…

Q: An empty Erlenmeyer flask weighs 241.3 g. When filled with water (d 5 1.00 g/cm3), the flask and its…

A: Given: Mass of the empty Erlenmeyer flask= 241.3g Density of water = 1.00 g/cm3 Mass of flask filled…

Q: Which of the following is incorrect: a. General steps in quantitative analysis include: Method…

A: A multiple choice question based on chemical analysis, which is to be accomplished.

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A: “Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: You are working in a hospital and you saw that a patient took 500 mg of ibuprofen but the chart…

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Q: An average fly has a mass of 0,048 grams, An average ant has a mass of 3,12 × 10-à grams. • Would…

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Q: After performing precipitation gravimetry, Asta placed the weighing form inside the crucible, heated…

A:

Q: A contractor has 215 bags of cement. Each bag weighs 25.0 kg. How many tonnes of cement does the…

A: Often while calculating, there is a need to convert units from one system to another system. The…

Q: Which of the following is incorrect: a. General steps in quantitative analysis include: Method…

A: Statement a is correct as it includes general steps in quantitative analysis.  Statement b is…

Q: show calculation setups and answers for the following problem:  A metal sample weighs 56.8 g. How…

A: The given sample weight in grams is first converted into lb shown as below,

Q: In a copper-plating experiment, the experimental amount of copper deposited is 3.0 grams. If the…

A: Use the percent error formula to calculate expected or theoretical amount of copper deposited to…

Q: The relative error calculated for the analysis of Zn alloy was -4.1%. Assuming that the sample is…

A: The relative error is the ratio of absolute error to the measurement being taken multiplied by 100.…

Q: 8) The vessel to be weighed should be placed of the pan. (off to the side, or in the center) 9)…

A: 8. The vessel to be weighed should be placed in the center of the pan.  For proper weighing, vessel…

Q: Which of the following is incorrect: a. General steps in quantitative analysis include: Method…

A: Statement a is correct because it include correct general steps in quantitative analysis.

Q: You try your best to put your samples in the middle of the balance pan when you try to weigh them…

A: Random error is the error occurs when error in experimenal process and the value of this error is…

Q: I need help with convertion problems in chemistry, Suppose you need 8.5m of Grade 70 tow chain,…

A: Given length of chain = 8.5 m  conversion factor - mass per length = 2.16 kg/m  we can say that 1 m…

Q: You record the following data during the Qualitative and Quantitative Characterization of Aspirin…

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Q: A standard sample of pooled human blood serum contains 42.0 g of albumin per liter.Laboratory X…

A: Precision is the reproducibility of measurements where accuracy is the closeness of measured value…

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A: Metric conversion factors are used to convert the units of numbers.  Some of the factors that can be…

Q: What is the density of a liquid, in g/mL, which has a mass of 1500 mg when the reference liquid used…

A:

Q: You are given a cube of pure adamantium. You measure the sides of the cube to find the volume and…

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Q: 4-The density of water at 4°Cs known to be 1.00 g/ml kim experimentally found the density of water…

A: Given the density of water at 4 degree centigrade is 1.00g/ml. Experimental density of water is…

Q: A data set is recorded to find the density and identity of a spherical piece of an unknown metal.…

A:

Q: G. An irregularly-shaped sample of aluminum (- put on a balance and found to have a mass of 43 9.…

A: Volume of copper = Difference in the water levels…

Q: Calculate the density of an unknown solid (g/ml) = A top-loader balance measured the mass of the…

A: Density = mass÷ volume Number of moles = mass ÷ molar mass

Q: -- - p I You are to give ampicillin 25 mg/kg to a child with a mass of 66 lb. If stock on hand is…

A:

Q: 6. An empty Erlenmeyer flask weighs 241.3 g. When filled with water (d = 1.00 g/cm³), the flask and…

A:

Q: You are given the following data set: 50.3 52.8 60.3 55.4 48.3 35.4 57.6 Please choose the best…

A: As per our community guidelines we can only answer 3 sub-parts of a question, out of all the…

Q: "Systematic errors typically affect accuracy whilst random errors generally affect precision”. Do…

A: Accuracy means if we are performing any experiment and if we get a true value(expected value) than…

Q: A method of analysis yields masses of gold that are low by 0.5 mg. This method is used for analysis…

A:

Q: Use the simulated data below to calculate the mass/mass percent of casein in your sample of milk.…

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Q: When calculating the percent error how do I know how many digits should be in my final answer can…

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Q: A piece of alloy in the form of a disc weighs 50.0 g.  The disc is 0.250 inches thick and has a…

A: First we have to find the volume occupied by the disc

Q: A pycnometer is a device used to measure density. It weighs 20.455 g empty and 31.486 g when filled…

A: Density is given by,

Q: 1. The manufacturer of the vinegar used in the experiment stated that the vinegar contained 5.0%…

A: Percentage error is the accepted value minus experimental value devided by accepted value and…

Q: I measured a line that was 8.4 centimeters which is the same as 3.375 inches. How do I calculate the…

A: The relative percentage error is equivalent to the algebraic ratio between the difference measured…

Q: 40 85 50 pard 65 rastes 2 105 5 240 90 Total following: at you choose a basis of 100 kg as a waste…

A:

Q: In compounding a prescription, a pharmacist weighed 0.05 g of a substance on a balance insensitive…

A: We have, Weight of the substance measured = 0.050 g Smallest quantity that can be measured = 0.004 g…

Q: A loss of 0.4 mL of Zinc occurs in the course of an analysis to determine that element. Calculate…

A: Given that in an experiment involving Zn there is a loss of 0.4 mg of Zn. We need to calculate the…

Q: Which of the following is incorrect: a. General steps in quantitative analysis include: Method…

A: Statement a is correct as general steps is quantitative analysis includes all given steps.

Q: The maximum level that the EPA considers safe for lead air pollution is 1.5 micrograms per cubic…

A: Given : Volume of lungs = 5.30 L And maximum safe level concentration of lead = 1.5 µg/m3

Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.