Anonymous asked 5/22/2010 Chlorine And Fluorine Are Located In The Same Group In The Periodic Table. If The Reaction Were Performed With Fluorine Instead Of Chlorine, How Many Moles Of H2 Would Be Required To Balance The Equation?
Anonymous asked 5/22/2010 Three Elements, X, Y, And Z, Have Consecutive Increasing Atomic Numbers. If Element X Is A Noble Gas, What Will Be The Symbol For The Ion Of Element Z In Its Compounds?
Anonymous asked 5/22/2010 The Figure Above Shows A Compound Containing Hydrogen (H) And An Unknown Element Z. To Which Group On The Periodic Table Does Element Z Belong?
Anonymous asked 5/21/2010 5C + 2SO2 Yields CS2 + 4CO Carbon Disulfide Is Prepared Industrially By Reacting Carbon With Sulfur Dioxide According To The Above Equation. If 5.9 Moles Of Carbon React, How Many Moles Of CS2 Are Produced?
Anonymous asked 5/21/2010 A Student Hypothesizes That Bromine (Br) Has Different Chemical Properties From Krypton (Kr). The Periodic Table Supports This Hypothesis By Indicating That -?
Anonymous asked 5/21/2010 Potassium (K) Has A Smaller Atomic Mass Than Argon (Ar) Even Though The Atomic Number Of Potassium Is Larger Than The Atomic Number Of Argon. Which Of The Following Best Accounts For This Observation?
Anonymous asked 5/20/2010 In The Reaction 2SO2 (g) + O2 (g) 2SO3 (g), Which Change Would Cause The Greatest Increase In The Concentration Of SO3?
Anonymous asked 5/20/2010 If Excess Ammonium Sulfate Reacts With 20 Grams Of Calcium Hydroxide, How Many Grams Of Ammonium Hydroxide Are Produced?
Anonymous asked 5/19/2010 With N Representing The Outermost Energy Level, The Electron Configuration For That Level For Elements In Group 14 Is -?
Anonymous asked 5/19/2010 A Team Of Chemistry Students Made The Above Measurements And Density Calculations Of The Same Type Of Material. The Accepted Value (true Value) Of The Density Of The Material Is 5.72 G/cm3. Which Trial Has The Least Amount Of Absolute Error?
Anonymous asked 5/18/2010 C-12 And C-13 Are Naturally-occurring Isotopes Of The Element Carbon. C-12 Occurs 98.89% Of The Time And C-13 Occurs 1.108% Of The Time. What Calculation Should Be Used To Determine The Atomic Mass Of This Element?
Anonymous asked 5/18/2010 An Ice-skating Rink Has Tubes Under Its Floor To Freeze The Water. Salt Water Is Cooled Well Below The Freezing Point Of Water And Pumped Through The Tubes To Freeze The Water In The Rink. Why Can The Salt Water Be Cooled So Low Without Freezing?
Anonymous asked 5/18/2010 Water Has Several Unique Properties Such As High Boiling Point, High Surface Tension, And Low Vapor Pressure. The Type Of Attraction That Best Accounts For These Unique Properties Is?
Anonymous asked 5/18/2010 A Chemist Is Examining An Unidentified Element Sample With Oxidation States Of +2, +3, And +6. The Element Has A Shielding Effect Similar To That Of Potassium (K). Which Statement About The Unidentified Element Is Most Likely True?
