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UIC / Science / DAOB 1220 / how many carbon atoms are there in a diamond (pure carbon) with a mass

how many carbon atoms are there in a diamond (pure carbon) with a mass

how many carbon atoms are there in a diamond (pure carbon) with a mass

Description

School: University of Illinois at Chicago
Department: Science
Course: Chemistry
Professor: Islam
Term: Fall 2016
Tags: Chemistry
Cost: 50
Name: Chem 122 Exam 1 study guide
Description: This study guide covers chapters 1-4 for Exam number 1 of Dr. Islam's class. I have included practice problems and answers. Good luck studying!
Uploaded: 02/05/2017
6 Pages 77 Views 0 Unlocks
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CHEM 122 STUDY GUIDE 1) The 3 states of matter are:_______, ________, and ________. 2) __________ has a fixed shape and volume 3) __________ takes up the shape and volume of a container 4) __________ conforms to the shape of a container, but not the volume. 5) __________ mixtures have no distinguishable parts 6) __________ mixtures have some distinguishable parts 7) Physical changes are ___________________________________________ 8) Chemical changes are___________________________________________ 9) a) Solid CO2 sublimes into gaseous CO2: C or P  b) Liquid oxygen evaporates: C or P  c) Sodium metal burns when put into water: C or P  d) Barium melts at 725 degrees celsius: C or P  e) Solid AgCl forms when solutions of AgNO3 and NaCl are mixed: C or P 10) How many significant figures are in this number: 1.30 _________ 11) How many significant figures are in this number: 0.001125 __________ 12) How many significant figures are in this number: 5.0003 __________ 13) Write this in scientific notation: 315,171,000 ______________ 14) Write this in decimal notation: 1.18 x 10^-7_______________ 15) Calculate the answer with the correct number of sig figs: 56.55 x 0.920 / 34.2584 = 16) Calculate the answer with the correct number of sig figs: 0.987 + 125.1 - 1.22 = 17) __________ properties are independent on the size/ amount of the substance 18) __________ properties are dependent on the size/ amount of the substance 19) Classify whether each property is extensive or intensive: a) Mass is __________ b) Density is __________ c) Concentration is __________ d) Volume is __________ e) Temperature is __________ 20) An element has four naturally occurring isotopes with the masses and natural abundances given here. Find the atomic mass of the element and identify it. Isotope Mass (amu) Abundance (%) 1 135.90714 0.19 2 137.90599 0.25 3 139.90543 88.43 4 141.90924 11.13


24) What is the formula for Potassium Carbonate?




22) How many carbon atoms are there in a diamond (pure carbon) with a mass of 52 mg?




What is the mass of a proton in picograms?



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21) The mass of a proton is 1.67 x 10^-27 kg. What is the mass of a proton in picograms? 22) How many carbon atoms are there in a diamond (pure carbon) with a mass of 52 mg? 23) Calculate the number of moles of sulfur in 57.8 g of Sulfur. 24) What is the formula for Potassium Carbonate? 25) What is the empirical formula of a compound containing C, H, and O if combustion of 3.69 g of the compound yields 5.40 g of CO2 and 2.22 g of H2O? 26) What are the coefficients for the decomposition of nitroglycerin? ___C3H5N3O9 -----> ___N2 + ___CO2 + ___H2O + ___O2 27) FInd the mass percent of each element in NaClO228) What is the volume of one silver atom if its density is 10.50 g,cm^3 and if there are 107.9g in one mole of silver atoms is 6.022 x 10^23 silver atoms in units of cm^3 29) Write the formula for aluminum bromide 30) What is the IUPAC name for FeCl3 31) What is the molar mass of calcium phosphate? 32) Convert 5.36 m^3 to mm^3 33) Calculate the number of carbon atoms in 25.0 grams of isopropyl alcohol (C3H8O)? 34) How many molecules of sucrose (C12H22O11, molar mass = 342.30 g/mol) are contained in 14.3 mL of .140M sucrose solution? 35) The titration of 25.0mL of an unknown concentration H2SO4 solution requires 83.6 mL of 0.12M LiOH solution. What is the concentration of the H2SO4 solution (in M)? H2SO4+2LiOH----->H2O+Li2SO4 36) Determine the oxidation state of nitrogen in NO37) An atom of the most common isotope of gold, 197Au, has _____ protons, _____ neutrons, and 79 _____ electrons. 38) Isotopes that have the same ________________ but differing ________________. 39) The correct name for NaHCO3 is ______________________. 40) Elements in group 2A are known as the ________________________. 40) ELements in group 8A are known as the _______________________. 41) The chemical formula of Potassium Carbonate is ____________________. 42)ANSWERS 1) Solid, Liquid, Gas 2) Solid 3) Liquid 4) Gas 5) Homogeneous 6) Heterogeneous 7) Changes only in state or appearance, not chemical composition 8) Changes that alter the composition of matter 9) a) P  b) P  c) C  d) P  e) C 10) 3 sig figs 11) 4 sig figs 12) 5 sig figs 13) 3.15 x 10^8 14) .000000118 15) 1.52 (3 sig figs) 16) 124.8 (1 decimal place) 17) intensive 18) extensive 19) these properties are...  a) extensive  b) intensive  c) intensive  d) extensive  e) intensive 20) Atomic mass = sum fraction of isotope x mass a) 135.90714amu x .0019 = .258 b) 137.90599amu x .0025 = .345 c) 139.90543amu x .8843 = 123.72 d) 141.90924amu x .1113 = 15.79 i) Add all answers (a-d) together to get atomic mass of 140.1 21) 1.67 x 10^-11 22) 7.2 x 10 ^21 atoms C 23) 1.8 moles 24) K2CO3 25) CH2O 26) 4,6,12,10,1 27) 25.4% Na, 39.20% Cl, 35.39% O28) 1.706 x 10^-23 29) AlBr3 30) Iron (iii) chloride 31) Ca3(PO4)2= 310.174 g/mol 32) 5.36x10^9mm^3 33) 7.52 x 10^23 atoms C 34) 1.21 x 10^21 molecules sucrose 35) .20M 36) +2 37) 79, 118, 79 38) Atomic number, mass number 39) Sodium Bicarbonate 40) Alkaline earth metals 41) Noble Gasses 42) K2CO3
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