Sp2021 Exam 2

55R) The density of lead is 11.4 g/cm3. The mass of a lead ball with a radius of 0.50 mm is _g. 4nr. (n = 3.1416; Vsphere = "n3/3) A) 6.0 B) 4.6 x 10-2 C) 4.6 x 10-5 D) 6.0 x 10-3 E) 4.6

Ţ 51 51 speed speed speed speed speed speed speed speed speed speed speed speed B number number number number number number number number number number number number A B B B A 7 23 A

24R) The density of silver is 10.5 g/cm3. A piece of silver with a mass of 61.3 g would occupy a volume of cm3. A) 0.171 B) 644 C) 10.5 D) 0.00155 E) 5.84

The mass of a proton is 1.67 × 10-27 kg. What is the mass of a proton in femtograms? A) 1.67 × 10-21fg B) 1.67 x 10-18fg C) 1.67 x 10-15fg D) 1.67 x 10°fg E) None A В C E

Please answer questions 2&3

V LISten What is the structure of the product expected from the following reaction? .CI heat PRODUCT CI CI MacBook Air 吕0 F3 D00 D00 F4 ト F2 F5 F6 F7 FB F9 @ 23 24 & * 2 3 4 5 7 W E く0

I’m not sure if my answer is correct, can someone show me how to do the problem?

What is the mass of a magnesium block that measures 5.00 cm × 2.00 cm × 2.00 cm? The density of magnesium is 1.738 g/cm3.      Please type answer note write by hend.

Answer question 4 and 5 please

[References] blems 1 pt INTERACTIVE EXAMPLE Uncertainty in Measurement 1 pt In analyzing a sample of polluted water, a chemist measured out a 25.00-mL water sample with a pipet. At another point in the analysis, the chem to measure 25 mL of a solution. 1 pt The quantity 25 mL means that the volume is between X and X mL. 1 pt The quantity 25.00 mL means that the volume is between X and x mL. 1 pt Resubmit Hide Tutor Steps 1 pt Incorrect

634 mK/s = _______ K/s

Chapter 1 em 13 13 Part D A pound of coffee beans yields 60 cups of coffee (4 cups = 1 qt). How many milliliters of coffee can be obtained from 1.0 g of coffee beans? %3D Express your answer using two significant figures. Vα ΑΣφ mL Submit Request Answer < Return to Assignment Provide Feedback P Pearson t Contact Privacy Policyl Permissions Terms of Use | Copyright © 2020 Pearson Education Inc. All rights reserved. 47% 6)

The measurement of the brass cylinder is taken. The diameter is 2.0 cm, height is 4.0 cm, and mass is 110 grams. What is the experimental value of the mass density of the brass cylinder in g/cm^3 ?   a. 8.75 b. 8.05 c. 7.08 d. 8.50

Canvas Question 46 A The date on a penny recovered from the floor of Ruggles MBTA stop is unreadable. The following data for this penny are then collected. Measurement Value Density of Pure Copper Density of Pure Zinc Diameter of Penny Thickness of Penny Mass of Penny 8.96 g/cm³ 7.140 g/cm³ 19.05 mm 1.52 mm 3.878 g Given the facts below, which can you conclude about this penny? Minting Date of Penny Pre-1982 Composition by Mass 100% Cu 1982-Present 2.5% Cu, 97.5% Zn O the penny was minted before 1982 and contains 3.675 x 1022 atoms Cu O the penny was minted after 1982 and contains 3.483 x 1022 atoms Cu O the penny was minted before 1982 and contains 9.1187 x 1020 atoms Cu O the penny was minted after 1982 and contains 8.930 x 1020 atoms Cu $ 4 % M 5 MacBook Pro T A 6 & Y 7 1 8 U J 9 1 O O K 2

Curved arrows are used to illustrate the flow of electrons. Using the provided starting and product structures, draw the curved electron-pushing arrows for the following reaction. Be sure to account for all bond-breaking and bond-making steps. Select to Add Arrows esc ⒸHO-O k H₂O 0:8- F1 143,177 HgSO4 H₂O H₂O F2 31 Select to Add Arrows Select to Add Arrows DEC 80 F3 H₂O Q F4 tv ♫ 9 F5 A F6

15 - When you consider the significant numbers, which one is the result of (1,500 x 2.0) + (4.50/0.9) correct? a) 80 В) 8.0 NS) 8 O D) 80.0 TO) 8.00

Please help with #3

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

i think this is physics and chemistry so i hope you can help me to answer this, only TRUE OR FALSE

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