The pharmacist weight 800 mg of a substance on a balance of dubious accuracy. When checked on a balance of high accuracy, the weight was found to be 785mg. calculate the percentage error in the first weighing.

Q: Calculating the density of a rectangular wooden block (fig 3). In determining the density of a…

A: Density of the substance is equal to the ratio of mass to volume. Formula: Formula of wooden block:

Q: Standard deviation is an indication of the... a. precision of one measurement b. accuracy of one…

A: Standard deviation:a number which is used to inform how measurements for a group are spread out from…

Q: 15. In preparing a certain ointment, a pharmacist used 28.35 grams of zinc oxide instead of the 31.1…

A: Given, mass of zinc oxide (used) = 28.35 g mass of zinc oxide (required) = 31.1 g

Q: A cylindrical glass tube 12.7 cm in length is filled withmercury (density = 13.6 g/mL). The mass of…

A: Given, Length of cylindrical tube = 12.7 cm Density of mercury = 13.6 g/mL mass of mercury = 105.5 g…

Q: A 1.00m long beam of stainless steel with a square 2.00cm×2.00cm cross section has a mass of 3.02…

A: Given:Length of stainless steel=1.00 mCross-sectional area=2.00 cm x 2.00 cmMass=3.02…

Q: What is the uncertainty of a measurement using a milligram balance?

A:

Q: Copper can be drawn into thin wires. How many meters of 34-gauge wire (diameter 5 6.304 x10-3 in)…

A: Given information is as follows; Percentage of copper by mass = 66%  Fraction of copper by mass =…

Q: What is the volume of a sample of mercury (d = 13.6 g/ml) which weighs 1000. g?

A:

Q: 20 Express the answer to this multi-step calcu- lation using the appropriate number of sig- nificant…

A:

Q: Suggest two sources of systematic error and two sources of random error in measuring the width of a…

A: Error in a measurement is observed when the true measurement value differs from the measured value.…

Q: Explain the difference between random error and systematic error.

A: A mistaken result or false result obtained in an experiment or study is termed as error. Error is…

Q: A student experimentally determines the density of water to be 0.9955 g/mL. The reported density of…

A:

Q: Which of the following statements about the sensitivity of an analytical method is true? O The…

A: Two questions based on tools in analytical chemistry that is to be accomplished.

Q: Volume of water in gradudated cylinder:33.8 mL Volume of water plus pellets:41.8 mL Volume of…

A: Given Volume of water in gradudated cylinder:33.8 mL Volume of water plus pellets:41.8 mL

Q: Does standard deviation give a measure of precision or accuracy?

A: Interpretation - Does standard deviation give a mesure of precision or accuracy -      Introduction…

Q: A 1.00 m long beam of stainless steel with a square 2.00 cm times 2.00 cm cross section has a mass…

A: Since density of any metal is given by  Density = mass of metal / volume of metal

Q: How are systematic method errors detected?

A: Systematic method error is a kind of systematic error. It will have a different calculated mean…

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: Five students used the same ruler to measure the length of the same pencil. These are their results:…

A: a. Given data : The results of the five students are given below : 15.34 cm, 15.33 cm, 15.34 cm,…

Q: You have a 40-lb baggage limit for a transatlantic flight. When your baggage is put on the scale,…

A:

Q: Water Temperature 8 degrees Time (sec) to 60 cm Time (sec) to 40 cm Time (sec) to 20 cm Skittle…

A: A question based on matter that is to be accomplished.

Q: How are systematic errors detected?

A: Systematic method error is a kind of systematic error. It will have a different calculated mean…

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…

Q: A student estimated that the volume of a crucible was 28.6 mL. When the volume was accurately…

A: percentage error is given by  % error = (experimental value - actual value ) X 100 / actual value.

Q: How many picograms are in 4.28 x 10^-11g?

A: 1 picogram = 10-12 grams

Q: An empty Erlenmeyer flask weighs 235.6 g. When filled with water (d = 1.00 g/cm3), the flask and its…

A: Given, Mass of flask = 235.6 g Mass of flask + water = 571.3 g Density of water = 1.00 g/cm3

Q: The usual dose of digoxin for rapid digitalization is a total of 1.0 mg, divide into two or more…

A: Given : Total dose of digoxin = 1.0 mg  And concentration of digoxin solution = 50 mcg/mL

Q: How do I solve this problem using dimensional analysis? Copper can be drawn into thin wires. How…

A: Copper is malleable and ductile metal which can easily change to wires and sheets. This is because…

Q: A group of students took turns using a laboratory balanceto weigh the water contained in a beaker.…

A: A group of students took turns using a laboratory balance to weigh the water contained in a beaker.…

Q: A method of analysis yields masses of gold that are lower by 0.40 mg. Calculate the percent relative…

A: The percentage relative error is percentage discrepancy in finding out the exact value of a…

Q: If the average American throws away 4.5 lb of trash each day, and the population of the US is…

A: Given: Population of US is 311 million. Amount of trash thrown by an American is 4.5lb.

Q: 2000 00010 A student has been asked to calculate the mass of an unknown liquid. He used a 10.00 mL…

A: Calculate the average mass:

Q: How many picograms are there in 3290 kg?

A:

Q: Suppose you were measuring out an organic liquid, and some of it is evaporated after you have…

A: The density of the substance is calculated by the relation shown below. Density=massVolume

Q: The legal limit for chromium in drinking water is 0.10 ppm. What is the maximum permissible mass of…

A:

Q: what is the thickness of a material that spreads over an area of 600 cm2  and has a volume of 0.25…

A: Thickness: Volume divided by the area gives the thickness of any object.

Q: Explain why materials with very low density exhibit a greater degree of uncertainty in mass when…

A:

Q: You’re attempting to calculate the density of a titanium alloy. The titanium alloy is in the shape…

A:

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: 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: An empty Erlenmeyer flask weighs 201.9 g. When filled with water (d = 1.00 g/cm), the flask and its…

A:

Q: At a particular instant in time, the Earth is judged to be92,955,000 miles from the Sun. What is the…

A: Significant figures can be defined as the total number of digits present in the number including…

Q: B. Perform the following calculations, and give the correct number of significant figures in the…

A:

Q: In determining the density of a rectangular wooden block, use the information in the table below and…

A: Concept introduction: Density of the substance is equal to the ratio of mass to volume. Formula:…

Q: Volume: 200 mL  Diameter = 5.45 cm  Height = 9.72 cm Using the equation V= ??2ℎ, calculate the…

A: Formula used :- V = πr2h