General Questions and Answers

If 650 0 grams of HCl are spilled what is the minimum number of grams of barium hydroxide necessary to completely neutralize the spill 2 HCl Ba OH 2 BaCl2 2 H O

5 An unknown compound was decomposed into 316g of carbon 26 3g of hydrogen and 208g of oxygen What is this compound s molecular formula What is its empirical formula

According to the video Raw to Ready Bombardier what is added to aluminum to make the skin of the airplane stronger O titanium O copper iron zinc

A plot of pressure volume isotherms for an ideal gas at two different temperatures is shown below In which of these processes would AH gas 0 Pressure Atm 25 20 15 10 5 State X A X Y B Y Z C Z X 2 State Y D X Y and Y Z E Y Z and Z X 4 State Z Volume L 6 T 546 K T 273 K 8

Which pair of particles has the same number of electrons A F Mg B Ne Ar C Br Se D Al P

What mass of sodium hydroxide NaOH molar mass 40 0 g mol is needed to make 100 0 mL of a 0 125 M NaOH solution A 0 0500 g B 0 500 g C 3 13 g D 5 00 g

2 Circle the acid in this equation a H CO3 H O H3O HCO3 b KOH C H6O KC H5O H O c 2HCl Mg OH 2 2H O MgCl2 ed to amen d 96 00 A sam en Seved woy is Moldes KOH C H6O KC H5O H O

Aldoses contain a C O bond True O False

1 ammonium sulfite NH4 2 SO3 molar mass of compound 11 15 N214 07 H 609 7

34 2 points Water is commonly one of the products formed in which type of chemical reaction O decomposition combustion single displacement combination Previous

Question 3 of 11 Predict the products of the following reaction H SO4 BaCl 4 points JA BaSO4 s HCl aq B BaSO4 aq HCl s C CISO4 aq BaH s OD No Reaction

1 List the chemical formula including charge for each of the following ions a sulfate b chlorite c acetate d sulfide e dichromate f phosphate

Which of the following systems is not at equilibrium O The pencil lead with which you are answering questions on this exam The table salt in your kitchen cabinet O A diamond ring A bottle of water at room temperature and pressure

d If you have a yellow light bulb and a blue light bulb which emits the largest wavelength the highest frequency the highest energy and the fastest speed

Question 3 Points 2 Which among the following three themes can be found in G B Shaw s Pygmalion Revenge love and friendship Survival capitalism and love Love friendship and death Love survival and dead

using the following thermochemical equation determine the amount of heat produced from the combustion of 14 3g benzene c6h6 the molar mass of benzene is 78 11 g mole 2C6H6 1 1502 g 12C02 g

Most of the people who work for the O Executive Branch O Judicial Branch are members of the civil service

The energy for the following reaction was measured to be 653 0 kJ mol K g Cl g KCI s Using this fact and the data in the table below calculate the enthalpy in kJ mol required to separate the ions from the lattice for this reaction KCI s K g Cl g lonization Electron Substance Energies Affinities kJ mol kJ mol K g 418 8 48 384

58 2 points Convert 735 2 K to degree Fahrenheit Answer to 1 decimal place Type your answer

3 points Given a compound has the following mass percent of elements Sr 49 89 C 13 68 and O 36 43 Given the molar mass in g mol are Sr 87 62 C 12 01 and O 16 00 Show your works for partial credit Sr4C204 Sr5CO3 SrCO3 SrC 04

Select the conjugate acid of a base PO4 3 O PO4 3 O H3PO4 OH PO4

Pb NO3 2 aq CaCl aq PbCl2 s Ca NO3 2 aq An ionic compound is soluble in water if it contains one of the following Positive lons Lit Na K Rb Cs NH4 Negative lons NO3 C H O 2 CI Br I except when combined with Ag Pb2 or Hg 2 SO except when combined with Ba Pb Ca Sr or Hg Ionic compounds that do not contain at least one of these ions are usually insoluble

Molality is defined as O moles of solute per liter of solvent moles of solute per kilogram of solvent O moles of solute per kilogram of solution O moles of solute per liter of solution

3 3 points Molecular iodine 12 Molar mass 253 81 g mol is produced by the reaction of 7 14 g of CuCl2 Molar mass 134 45 g mol according to the following equation 2 CuCl2 4 KI 2 Cul 4 KCI 12 How many grams of 12 is produced Answer to 2 decimal places Type your answer

Choose the correct answer If a Member of Parliament MP dies or resigns a special election called a is held in that s MP s constituency to choose a replacement Omid term election off term election by election

Write a balanced half reaction describing the reduction of aqueous vanadium V cations to aqueous vanadium I cations 0

Write and balance the reaction described below under acidic conditions Sum up all the stoichiometric coefficients on the left side or reactants side and pick that number for the answer NO Al AIO NH4 5 9

Predict and balance the following reaction Ag Cu NO3 2 The reaction does not occur Ag Cu NO3 2 Cu Ag NO3 2 Ag Cu NO3 2 Ag Cu NO3 2 O2Ag Cu NO3 2 Cu 2AgNO3

Which of the following will increase entropy in a reaction O cooling down the reaction heating up the reaction Making less moles of products than there were reactants Using a larger particle

Question 14 Which of the following elements has the highest electronegativity Carbon Oxygen Nitrogen Boron

ered The equivalence point of a titration of 350 0 mL of 0 00016 M weak acid with 0 00082 M strong base is reached when 480 0 mL of strong base is added What is the pka of the weak acid 1 03

14 6 g of CH3OH is dissolved in 184 g of water Calculate a the mol fraction of CH3OH b the mass of CH3OH c the molality of CH3OH O a 0 043 b 7 35 c 2 5 m O a 0 46 b 7 35 c 0 005 m a 0 955 b 7 35 c 0 005 m a 0 07 b 7 35 c 55 5 m

39 Calculate the mole fraction of acetone C3H O in a solution of water where equal masses of both molecules are present a 0 237 b 0 310 c 0 500 d 0 763 0861 P

Ar I need 0 0076 moles of BI for a reaction how many grams should I weigh out on the balance BI3 10 81 31126 9 391 51 0 0076 mol x 391 51 2 975 g mol 39 55 2 975g mol

Multiple Select What attributes of a chemical weapon make them particularly difficult to identify before they inflict widespread damage Select all that apply The time required for the toxic effects of the chemicals to affect humans can be delayed by as much as forty eight hours They inevitably do not have any fingerprints or other identifying features attached to them They can be dispersed using aerosol or other propellants directly into the air They may be relatively small and easy to conceal

How many moles of Hydrogen gas will be produced if you start with 2 5 moles of Magnesium and an excess of Hydrochloric Acid given the following balanced chemical reaction Mg 2HCI MgCl2 H 5 0 Moles 1 25 moles 7 5 moles 2 5 moles

Base your answer to the question on the information below and on your knowledge of chemistry A metal worker uses a cutting torch that operates by reacting acetylene gas C H g with oxygen gas O g as shown in the unbalanced equation below C H g O g CO g H O g heat 3 Determine the mass of 25 moles of acetylene gram formula mass 26 g mol

11 3 2 Independent Practice Topographic Maps 1 What is the elevation in meters of point X 2 What is the elevation in meters of point Y 3 What is the elevation in meters of point Z 4 What is the difference in elevation in meters between points X and Y 366 5 What is the difference in elevation in meters between point Y and the highest point on this landform 6 What is the difference in elevation in meters between points X and Z 144 600 PO 726A Contour Interval 20 m Date A418 Y Contour Interval 20 m Period 240 200 st 780 Z 160 140 120 100 7 What is the elevation in meters of point A 8 What is the elevation in meters of point B 9 What is the elevation in meters of point C 10 What is the difference in meters between the two points labeled A and C 11 What is the difference in elevation in meters between point B and the top of the hill Record your answer in the boxes below Be sure to use the correct place value

Randy has a sheet of paper He cuts a square out of the center Which of the following physical properties of the paper changes Density Electrical conductivity Mass Melting point

Question 32 How many grams of water will be produced if you start with 4 0 grams of hydrogen and an excess of oxygen given the following balanced chemical equation 2H O2 2H O 54 0 grams 36 0 grams 32 0 grams z pl 18 0 grams

An 85 0 g sample of iron requires 954 J of heat to raise its temperature 25 0 C What is the specific heat of the iron a 3240 J g C b 0 449 J g C c 2 23 J g C d 281 J g C

36 Lithium chloride has a solubility of 84 5 g 100 g water at 25 C Select the maximum mass of LiCl that would be soluble in 130 mL of water at this temperature 84 5 g LICI 100 g LICI 110 g LiCl d 130 g LICI e 154 g LICI a b

write down a detaled mechamsm for the following transformations 2 incts Brz CHJ C Br S H Ac Br D chy

Calculate the molarity of 34 2 grams of sugar C12H22O11 in 0 150 L of solution O 0 67 M O 342 M 0 10 M O 0 015 M

Multiple Choice Why do you suppose it is dangerous to look at the blast created by a nuclear weapon Similar to a tsunami the blast pulls every object within a short range into its center O The release of nuclear energy travels at great speed and anything exposed to or facing the blast will disintegrate in less than a second The intense release of radiation occurs at such speed and intensity that the initial blast is millions of times brighter than the sun The unique mushroom cloud formation is simply too frightening to comprehend

What is a catalyst A substance added to the reaction that lowers the activation energy by providing an alternate pathway for the reactions to go to completion O A substance added to the reaction that raises the activation energy by providing an alternate pathway for the reactions to go to completion A substance that slows down the reaction by lowering the activation energy O A substance that speeds up the reaction by increasing the activiation energy

As a radiographer turned biomedical engineer considering a new alloy for the target of an x ray tube you are designing which of the following properties are undesirable Good luster 1 High electrical resistant i Low coefficient of friction Select one Oa and i en 1 and 1 c i and ii

H o Z C 0 O H Which hybrid orbitals overlap to form the sigma bonds between the indicate atoms in xanthine M H N C H A Csp Nsp B Csp Nsp C Csp Nsp D Csp Nsp E Csp Nsp

52 3 points How much water is needed to add to 37 4 mL of 9 16 M NaCl aqueous solution to make a 2 03 M solution Answer to 1 decimal place Type your answer

If 17mL of 0 0118M KMnO4 was used to reach endpoint what was the weight of iron in one pill O 56 01mg O 280 06mg O 28 01mg O 11 20mg