Chemistry Notebook

Estimated volume of crucible 25.0 mL  measured volume of crucible 23.0 mL  percent error of estimate (% error=accepted value-experimental value/accepted value ) volume in (use measured volume of crucibleto answer for the ):  kL cL

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6. Question: Hint: Chapter: 1 Lesson: 2 A student weighs 20 M&Ms and finds that the average weight of a single M&M is 0.8695 g. How many M&Ms are in a 1 lb (453.6 g) bag of M&Ms? Assume that all of the M&Ms have the average mass of a single M&M.

3. A method of analysis yields masses of gold that are low by 0.4 mg. Calculate the percent relative error caused by this result if the mass of gold in the sample is a. 500 mg​​ b. 250 mg c. 60 mg 4. The method described above is to be used for the analysis of ores that assay about 1.2% gold. What minimum sample mass should be taken if the relative error resulting from a 0.4-mg loss is not to exceed a. -0.1% b. -0.8%

Please help with 7&8

Question 3

121 (OL) Lab 3 Den... V Layout Search References Mailings Review View Help 1 2 3 5 6 I i Lynette Maina Commer 7 LE T Chem 121(OL) Lab 3: Density of Common Materials Part C Thickness of Aluminum Foil (For help understanding the calculations read the introduction and procedure) An experiment performed for Part C to measure the length, width and mass of a piece of aluminum foil gave the following data. You will use this data to solve for the thickness of aluminum foil using the equation from Part C in the introduction. Length of foil Width of foil Mass of foil 13.10 cm 9.50 cm 9.745 g Use the data in the table to determine the thickness of your aluminum foil (in cm) using the 2.6989 g/mL for the density of aluminum then convert this value to meters (m) and micrometers (um). Show your work here (use back if necessary). ons: On Accessibility: Investigate F3 F4 W cm K F5 ►11 F6 K H m um DELL F7 F8 Gu F9 Focus BB 5= 57°F Mostly sunny 4/1 F10 F11 F12 PrtScr "T

How will each of the following experimental errors influence the results of your calculated densities you reported? State whether the error will tend to make your density results too large, too small or unchanged. Explain why this would occur by identifying which measurements would be affected (high or low) and how this would affect the calculated density. Use the followingIn method 2, the metal cylinder you used had a number of air bubbles on its when immersed in the water

Estimated volume of crucible 25.0 mL  measured volume of crucible 23.0 mL  percent error of estimate (% error=accepted value-experimental value/accepted value ) volume in (used measured volume of crucible) kL cL

#5

Question 4

Make a graph of the average mass vs. year. Make sure axes are labeled. Please please answer super fast please answer as fast as possible

Pre-Lab Study Questions 1. What property of oil makes it float on water? Water has more density than oil There is more water mass than oil per unit volume 2. Why would heating the gas in a hot air balloon make the balloon rise? Because there is hot air inside the baloon (from the heater/bun and it makes is less dense than the air of the outside the baloon 3. What is the difference between density and specific gravity? Ratios of each other. Density is the measure of the amount of mass per volume. Specific gravity is a measure of density relative to the density of a reference substance 4. An object has a mass of 18.4 g and a volume of 11.2 mL. a. What is the density of the object? p = m = 1.6 g/m² b. What is the specific gravity of the object? 18.49 - It is a number with no units olensity of substance g/mL density of water 1.00g/mL c. Will the object sink or float in water? Object will sink 11.2mL b. What mass, in grams, of the liquid is in 34.6 mL of the liquid? 1 (g) of liquid volume…

1. a. What are the three classifications of chemicals used in analytical chemistry? (one is Primary Standard Grade) b. What are the three common sources of error encountered in weighing (one is buoyancy) c. To what precision can analytical balances (in mg) and pan balances (in g) be read

Using the following mass standard data, calculate the Rx value. mass of mass of area of area of isopentyl acetate (g) isopentyl alcohol (g) isopentyl acetate peak isopentyl alcohol peak 80.0 1.10 1.28 189 Please report your answer to 3 decimal places. (No units required)

As viewed from Earth, most stars appear to move across the sky each night because A stars orbit around Earth   B Earth rotates on its axis   C stars revolve around the center of the galaxy   D Earth revolves around the sun

Part A 35 mLmL of 0.240 MM H2SO4H2SO4 Express your answer using two significant figures. .............. L ?   Part B 165 mLmL of 0.115 MM H2SO4H2SO4 Express your answer using three significant figures. .............L?   Part C 70 mLmL of 0.115 MM H2SO4H2SO4 Express your answer using two significant figures. ................L?

Laboratory 2 Report Sheet-Lab 2 A.2 Area Your measurements Length = Width = Area = (Show calculations.) Why could two students obtain different values for the calculated areas of the same rectangle? A.3 Volume of a solid by direct measurement Shape of solid Formula for volume of solid 18 Height Width Another student's measurements Volume of the solid (Show calculations of volume including the units.) Length Diameter (if cylinder) Page 3 of 3 482 words 区

Is this calculation correct? See image below. ...

ngures. Useful Information: 2.540 cm 1.000 in 29.6 mL 1.00 oz 3.28 ft= 1,00 m 1) What is the density in g/mL of gasoline if 0.066 kg occupies 100 mL? 2) What is the mass of heptane that will occupy 250 mL of its density is 0.684 g/mL?

Please help with #5

How do I solve for the percent value? The sample data calculated the answers but I have no idea how they obtained the percent error values. Calculate sample data #1 with detailed steps.

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Question 3 Does standard deviation give a measure of precision or accuracy? Use the editor to format your answer