Preparation and Properties of Compounds Questions and Answers

The shape of an atomic orbital is defined by the spin quantum number s principal quantum number n O magnetic quantum number m secondary quantum number 0

SO2 reacts with H S as follows 2H2S SO2 35 2H O When 7 50 g of H S reacts with 12 75 g of SO2 which statement is true A SO2 is the limiting reagent OB S is the limiting reagent OC H S is the limiting reagent D H O is the limiting reagent

At 25 C the equilibrium constant for the reaction 2 A aq B aq C aq is 1 77 If he concentration of B aq is 0 353 M and the concentration of C aq is 0 497 M what vould be the minimal concentration of A aq in mol L required to make the reaction pontaneous

For assessments in lab and lecture you must have these conversions memorized 1 m g L 10 m X 106 X 10 n X Show your work 1 Convert 100 um to a nm c m b mm 2 Convert 350 mL to A liter is a unit of volume a L b nL

According to Coulomb s law if the separation between two particles of the same charge is tripled the potential energy of the two particles is triple as high as it was before the distance separation is nine as high as it was before the distance separation O is one third as high as it was before the separation Odoes not change

Use the information and table to answer the question A chemistry company is hired to produce sodium chloride NaCl using the following equation HCl aq aq Na s The team of chemists recorded Mass of Na 14 25 g NaCl H g the following data Total Mass of Products 23 75 g Mass of HCI Solution 9 50 g Develop a plan the company can use to test and justify that a chemical reaction has

You synthesize a new radon compound in which the central radon atom is bonded to four fluorine atoms and two oxygen atoms How many valence electrons does its Lewis structure contain 48 32 28 12

select select a What is the most abundant isotope of magnesium Bis the most abundant isotope b What is the least abundant isotope of magnesium Bis the least abundant isotope Magnesium 24 has 24 Magnesium 25 has Magnesium 26 has c Will the relative atomic mass of magnesium be closer to a value of 24 or 25 or 26 The relative atomic mass will be closer to select d List the number of protons electrons and neutrons in each of the ions shown in the mass spectrum protons 10 13 protons 25 Mass charge protons electrons and electrons and 11 17 electrons and 26 neutrons neutrons neutrons

Complete the following table by selecting true or false for each statement always an integer rarely an integer a measurement the sum of the number of protons and neutrons The mass number of an atom is select B select B select B select B The mass of an atom is select B select B select B select B

Suppose that the isotope abundance of magnesium on another planet has been determined to different from that on Earth as shown in the following table Calculate the relative atomic ma magnesium on this planet Isotope Mass amu Natural abundance 24 Mg 23 985 20 00 25 Mg 24 985 20 00 25 983 60 00 26Mg amu

Identify the type of organic compound shown CH3 C O CH3 O aldehyde O ester O amine O ketone none of these

8 Three Letter Crossword Entries Excluding J Q X and Z how many 3 letter crossword puzzle entries can be formed that contain no repeated letters It has been conjectured that all of them have appeared in puzzles over the years sometimes with painfully contrived definitions shable 11 letter

a b 4 Where do molecules store chemical energy when their atoms are bonded together In their valence electrons In their nucleus c In their bonds d a In their subshells 5 How would heat flow when a pan is placed on a hot stove Heat would not flow in this scenario From the cold pan to the warmer stove From the cold stove to the warmer pan d From the hot stove to the cooler pan

6 The formation of water from gaseous hydrogen and gaseous oxygen has a negative enthalpy of reaction This means the reaction is Endothermic Exothermic Nuclear Explosive 2 H g O g 2 H O 1 AH 579 0 kJ mol

What is the stereochemistry of the product of the following reaction A B C 2R 3R 2R 39 2S 3R D 2S 3S H Br KCN

7 Which graph would benefit the most from a catalyst Left graph Both graphs c Right graph Neither d 8 If a catalyst was added to both graphs which graph would experience a decrease in activation energy Left graph c Right graph Both graphs d Neither Potential Energy Activation energy Reactants energy released Reaction Progress Products Potential Energy Activation energy Reactants Products energy absorbed Reaction Progress

3 Potential Energy kJ 240 2004 220 120 40

1 NaOH s HCl g NaCl s H O g 133 8 kJ 2 2 CO2 s 556 kJ 2 CO O2 8 3 Potential Energy kJ 24 0 2004 180 1404 44

1 NaOH s 2 2 CO2 3 ot 240 Potential Energy kJ 2004 100 1204 HCl g NaCl s H O g 133 8 kJ 556 kJ 2 CO 028 g

6 Endothermic b Exothermic C Nuclear d Explosive The formation of water from gaseous hydrogen and gaseous oxygen has a negative enthalpy of reactio This means the reaction is 2 H g O g 2 H O 1 AHxn 579 0 kJ mol

Refer to the following phase diagram not to scale for methane P atm 45 7 1 00 0 092 90 6 90 7 T Kelvin A sample of methane at a pressure of 1 00 atm and a temperature of 92 8 K is heated at constant pressure to a temperature Which of the following are true Choose all that apply 109 1 190 7 The final state of the substance is a gas One or more phase changes will occur O The sample is initially a liquid The sample is initially a solid O The gas initially present will solidify

BCh Group E Expanded Octets SF PCI Group F Multiple Central Atoms C H6 Cals Brfs C H5OH BeF2 XeF C H CIF C F2

How many aromatic isomers of dibromobenzene exist 0 3 02 06 O 8 04

0 The standard enthalpy of formation of hematite Fe O3 s is 825 5 kJ mol What is the standard enthalpy of reaction for the reduction of hematite with carbon monoxide to give metallic iron as shown below AH xn 283 0 kJ mol CO g 2O2 g CO g Fe O3 s 3 CO g 2 Fe s 3 CO2 g A 23 5 kJ mol C 849 0 kJ mol AH rxn B 542 5 kJ mol D 1674 5 kJ mol

A glycosidic bond is Any bond that can be broken by reaction with water O a bond between any two carbohydrate molecules O None of the choices O a bond formed between an anomeric carbon atom and any OR group O A bond between anomeric carbon atoms on two separate monosaccharides

Two isomeric forms of a saturated hydrocarbon O have different compositions of elements O have the same molecular formula O react vigorously with one another O have the same structure O have a different content of the isotones of hi

17 Sodium halides crystallize in the rock salt structure which has a cubic unit cell with four formula units per unit cell A sodium halide has a density of 2 83 g cm and a unit cell edge length of 462 pm Which compound is it 2 83 N F B NaCI C NaBr D Nal

Which of the following is not a disaccharide O Maltose O Sucrose O Lactose O Glucose

24 Which reaction has AS rxn 0 All reactants and products are liquids A B C D Br Br Br

3 Aluminum crystallizes in a face centered cubic unit cell with an edge length of 405 pm What is its density B 1 35 g cm D 5 40 g cm 3 A 0 674 g cm C 2 70 g cm

Which compound is a secondary amine O N N dimethylethylamine O N ethyl N methylpropylamine O trimethylamine O isopropylamine diethylamine

Which of the following is a conjugate acid of water O H3O O HCI O NH4 O OH

All of the following are interactions that stabilize the tertiary structure of a protein except O Hydrogen bonding O Hydrophobic pocket O lonic salt bridges Covalent peptide bonding

An amino acid whose R group is predominantly hydrocarbon would be classified as O neutral polar O neutral nonpolar O basic O isoelectric O acidic

Which best explains phenol the conjugate base is the most stable due to resonance O the conjugate acid is the least stable due to resonance O the conjugate base is the least stable due to resonance O the conjugate acid is the most stable due to resonance

Write the reaction for the dissociation of acetic acid CH3COOH in H O If the equilibrium constant Ka 1 76 X10 5 is the reaction favored in the forward or reverse direction

Chartes Law Gay Lussace i As he pressure of 0 370 am at 500 C What is the pressure at standard temp Boyle s Law b Charles Law Gay Luss Band C OO L

oline together Write a complete balanced chemical equation with states of matter for the reaction that will occur in this lab 12 Label the charge of each substance in your equation and identify the following the chemical substance that is oxidized the chemical substance that is reduced and the spectator ion 13 Determine the empirical formula of a binary ionic compound that is found to be 22 71 magnesium and 77 29 chlorine by mass SHOW YOUR WORK

6 A 5 00 g mixture of potassium sulfide and potassium chloride contains 2 80 g potassium What percentage by mass of the mixture is potassium sulfide A 13 8 B 19 2 C 44 0 D 96 1

Select one 1 Dg Dg reaction below 2H O O H H 4 4 H H O H H 0 0 OH alter be 0 0 2H Tor 0

De Select one O Study the chemical reaction 1 O Which statement about this reaction is correct The reaction is balanced Both sides have equal numbers of atoms The reaction is not balanced There are more carbon atoms on the products side than on the reactants side The reaction is balanced Both sides have equal numbers of carbon atoms The reaction is not balanced There are more hydrogen atoms on the reactants side than on the products side and there are more oxygen atoms on the products side than on the reactants side CH4 O2 CO2 H O

18 Conservation of Mass Question 10 Na H O NaOH H 19 Select one This chemical reaction represents the reaction of sodium Na in water H2 0 to produce sodium hydroxide NaOH and hydrogen gas H When correctly balanced the coefficient for sodium hydroxide NaOH is O 1 O 3 02 O 4

3 Select one 4 De 18 lowing When a match burns the match goes away and thus some matter is destroyed 5 O True This chemical reaction destroys matter False The atoms are not destroyed they are only rearranged O True Matter is consumed by the flame 6 O False The mass of ash is the same than the match it came from 7 8 9 10

equation Select one 18 O NO Cl NOCI O O 2NaOH CaBr Ca OH NaBr 2A1C1 3Mg 3MgCl 2A1 O CaCO3 CaO 2CO BERJE LARAREA

For each phase transition is the process endothermic or exothermic Condensation Select Deposition Select Evaporation Freezing Melting Select Select Select Sublimation Select Select exothermic

6 14 0 mL of 0 53 M barium nitrate solution and 16 0 mL of 0 44 M sodium sulfate solution are mixed Which ion is LEAST abundant in solution A Ba B NO3 C Nat D SO4

Isopropanol C3H8O has a heat of vaporization of 45 4 kJ mol at 25 0 C How many joules of energy will be absorbed by 271 mL of isopropanol in order to evaporate at that temperature d 0 790 g mL

Acetone C3H6O has a heat of fusion of 5 69 kJ mol How many kJ of energy will be absorbed by 319 grams of acetone melting

Water has a heat of vaporization of 44 0 kJ mol at 25 0 C How many kJ of energy will be absorbed by 3 81 grams of water as it evaporates at this temperature

For each property choose which phase of matter fits the description for most substances Highest density Select Greatest molar volume Select Most compressible Select Strongest intermolecular forces Has a definite shape Select Select Easily changes shape but not density Select Select Expands to fill all available space Se gas solid