Chapter 1 D2L Homework Online

A chemist measures the amount of nitrogen gas produced during an experiment. She finds that 27.7 g of nitrogen gas is produced. Calculate the number of moles of nitrogen gas produced. Round your answer to 3 significant digits. mol x10 Elanation Check O 2022 McGraw Hill LLC. All Rights Reserved. Terms of Use Privacy Center Accessiblity 80 F Cloudy DELL Delete PrtScr Insert F11 F12 F9 F10 F7 F8 F5 F6 F3 F4 F1 F2 Backspace

[References] Use the References to access important values if needed for this question. Write each of the following numbers in exponential or scientific notation. Write each number to two decimal places with only one non- zero digit before the decimal point. Example: Use 1.20 × 104 not 0.120 × 10-³ or 12.0 × 10-5. 7640 0.000125 0.000844 257000 Submit Answer 4 Try Another Version 1 item attempt remaining Previous Next

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

Part B Gather all of your pennies dated before 1982. Then follow the steps to complete the table. Include units as necessary. Record the number of pennies dated before 1982. Weigh (as a group) the pennies dated before 1982. Record the total mass. If you’re unfamiliar with using an electronic balance, watch this video before continuing. Calculate and record the average mass of a single penny. If you need help with the calculation, visit the averaging data section of the math review. number of pennies: 8 combined mass of the pennies (g): 49.2 average mass of a penny (g): 5.525 Part C Now gather all of your pennies dated after 1982. Complete the table for the post-1982 pennies using the same steps from part B. number of pennies: 9 combined mass of the pennies (g): 51.7 average mass of a penny (g): 5.744 Part D In parts B and C, you measured the average mass of each group of pennies. Now you’ll measure their volume. (For this part, assume that the pennies dated before and after…

Part B Gather all of your pennies dated before 1982. Then follow the steps to complete the table. Include units as necessary. Record the number of pennies dated before 1982. Weigh (as a group) the pennies dated before 1982. Record the total mass. If you’re unfamiliar with using an electronic balance, watch this video before continuing. Calculate and record the average mass of a single penny. If you need help with the calculation, visit the averaging data section of the math review. number of pennies: 8 combined mass of the pennies (g): 49.2 average mass of a penny (g): 5.525 Part C Now gather all of your pennies dated after 1982. Complete the table for the post-1982 pennies using the same steps from part B. number of pennies: 9 combined mass of the pennies (g): 51.7 average mass of a penny (g): 5.744 Part D In parts B and C, you measured the average mass of each group of pennies. Now you’ll measure their volume. (For this part, assume that the pennies dated before and after…

» Significant Figure Rules 01 >> 02 >> 03 >> 04 >> 05 >> All nonzero digits are significant. Zeros that appear between other nonzero digits are always significant. Zeros that appear in front of all of the nonzero digits are called left-end zeros. Left-end zeros are never significant. Zeros that appear after all nonzero digits are called right-end zeros. Right-end zeros in a number that locks a decimal point are not significant. ▬▬▬ 美銀銀時 ☐☐ Right-end zeros in a number with a decimal point are significant. This is true whether the zeros occur before or ofter the decimal point. 237 has three significant figures. 1.897 has four significant figures. 39,004 has five significant figures. 5.02 has three significant figures. 0.008 has one significant figure. 0.000416 has three significant figures. 140 has two significant figures. 75,210 has four significant figures. 620.0 has four significant figures. 19.000 has five significant figures. For multiplication and division problems, the answer…

Can you please solve #9,10,11  show all of your steps and explain how you do it, the second picture is my work I was trying to do but I don't know if my work is right. SHOW ALL YOUR WORK IN PICTURES! DO NOT TYPE IT. THank you !

Please show work and please be clear thank you

Answer number 1-4 pls. I don't want to waste my money here.

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

Gaseous ethane CH3CH3 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O . Suppose 17. g of ethane is mixed with 99.4 g of oxygen. Calculate the minimum mass of ethane that could be left over by the chemical reaction. Round your answer to 2 significant digits. Please give correct answer and typed answer only, no copy paste

answer then one of those cheap samples crept into ou stock of metal samples and you "unknown metal”. Note: volume measurements are not very exact. If your density determination is off by 0.1 or 0.2 from the known value, that's probably good enough for an identity. Metal Platinum Gold Tantalum Silver a) You weight your sample and determine it weighs 71.8 grams. You put the sample into 15.6 mL of water and the total volume rises to 22.4 ml. What metal do you have? Density (g/ml) 21.45 19.32 16.65 10.50 Metal Palladium Rhodium Plutonium Uranium Density (g/ml) 12.02 12.41 19.84 18.95 Metal Polonium Niobium Tungsten Gallium Density (g/ml) 9.3 8.57 19.35 5.91 b) You weight your sample and determine it weighs 56.3 grams. You put the sample into 28.9 mL of water and the total volume rises to 32.9 ml. What metal do you have? c) You weight your sample and determine it weighs 105.3 grams. You put the sample into 31.2 mL of water and the total volume rises to 39.6 ml. What metal do you have? d)…

Here is my current numbers from my chem lab today. I’m not sure how to take these numbers and get the last two calculations. We are supposed to use our lab numbers to get those numbers.

Unless otherwise informed, report all answers in standard notation to 3 significant figures.

A student calculated the density of isopropyl alcohol to be 0.688 g/mL. The accepted density for isopropyl alcohol is 0.786 g/mL. Calculate the percent error % (omit the units) *SHOW YOUR WORK

A chemist adds 1.13 L of a 44.1 g/dL calcium bromide (CaBr,) solution to a flask. Calculate the mass in kilograms of calcium bromide the chemist has added to the flask. Round your answer to 3 significant digits. kg Check O 2022 McGraw Hill LLC. All Rights Reserved Terms of Use tv FED 27 MacBook Air

Instructions for this problem say, "Solve each problem and report your answer to correct significant figure and units. Remember that units multiply, divide, add, subtract, and simplify just like variables." (3.1 x 10^4 nm^2)^1/2   How do I solve with a half exponent? Image of my attempt attached.

Leaming Goal: To learn how to round an answer to the correct number of significant figures. When we report a measurement in science, we are careful to report only digits known with certainty, plus a final digit that is recognized to be uncertain. We call this set of digits significant figures. Often, these numbers are used in calculations. When we use a calculator, the calculator does not automatically account for significant figures, so we have to do so ourselves. There are some basic rules for handling significant figures in calculations as shown in the table and outlined to the right. Significant Figure in Calculations MULTIPLICATION DIVISION 123.1 x 23 = 2.8 x 10 4 s.f. 2 s.f. 2 s.f. 123.1/23 = 5.4 4 s.f. 2 s.f. 2 s.f. ADDITION SUBSTRACTION 123.1- 23 = 1.00 x 10 (also 100.) 123.1 + 23 = 140 1 d.p. Od.p. O d.p. 1 d.p. O d.p. Od.p.

Please help with question 4

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See attached image. Calculate the moles and mass of acetylsalicylic acid in each tablet (molar mass = 180.16 g/mol).

2 - MEASUREMENTS AND CALCULATIONS O Previous Page 21 of 22 E Next O References Use the References to access important values if needed for this question. Use unit analysis to show how to calculate the mass of 16.8 mL of aluminum. See the table below for the density of aluminum. (number) (unit) 16.8 mL Al g Al 16.8 (number) (unit) Densities of Some Common Substances Substance Density (g/mL) Water 1.00 Aluminum 2.72 étv A A O 66 JAN 27 280

Chapter 1 hw