Chemical Bonding Questions and Answers

a dsp3 b d2sp3 c sp3 d sp2 Question 29 Marked out of 1 Not yet answered a 413 KJ b 7 4 KJ Flag question For the following reaction 4Fe s 302 g 2Fe203 s AH 1652 KJ How much heat is evolved when 1 0 g of iron is reacted with excess of oxygen

Two nitro NO groups are chemically bonded to a patch of surface They can t move to another location on the surface but they can rotate see sketch at right It turns out that the amount of rotational kinetic energy each NO group can have is required to be a multiple of E where e 1 0 x 1024 J In other words each NO group could have e of rotational kinetic energy or 2e or 3e and so forth but it cannot have just any old amount of rotational kinetic energy Suppose the total rotational kinetic energy in this system is initially known to be 18e Then some heat is removed from the system and the total rotational kinetic energy falls to 14e Calculate the change in entropy Round your answer to 3 significant digits and be sure it has the correct unit symbol A Two rotating NO groups bonded to a surface

The ionisation potential of two atoms A and B are 14 eV atom and 10 94 eV at om respectively and their electron affini ties are 8 4 eV atom and 6 eV atom res pectively If atoms A and B form co vale nt bond what percent covalent charact er is in the bond

A gas can be compressed to a fraction of its volume The same volume of a gas can be spread all over a room The reason for this is that B D The volume occupied by molecules of a gas is negligible as compared to the total volume of the gas Gases consists of molecules which are in a state of random motion Gases consist of molecules having very large inter molecular space which can be reduced or increased None of these

Select the correct order of evaporation for water alcohol petrol and kerosene oil B C D water alcohol kerosene oil petrol alcohol petrol water kerosene oil petrol alcohol water kerosene oil petrol alcohol kerosene oil

3 Which of the following option will be the limiting molar conductivity of CH3COOH if the limiting molar conductivity of CH3COONa is 91 Scm mol Limiting molar conductivity for individual ions are given in the following table S No Ions limiting molar conductivity Scm mol 349 6 1 2 3 a 350 Scm mol b 375 3 Scm mol c 390 5 Scm mol d 340 4 Scm mol H Na K OH 50 1 73 5 199 1

30 ml of a mixture of C2 H2 and CO exploded with 40 ml of oxygen The gases after the reaction had a volume of 45 ml On treatment with KOH 12 ml of oxygen remained Calculate the composition of the mixture A A C H 6 5ml CO 23 5ml B C2 H2 24ml CO 6ml c C H 4ml CO 26ml o

A 2 5 cm diameter pipe carrying condensing steam at 101 kPa passes through the center of a square block of insulating material having k 0 04 W m C The block is 5 cm on a side and 2 m long The outside of the block is exposed to room air at 27 C and a convection coefficient of 5 1 W m C The outside of the insulation may be assumed black Calculate the heat lost by the steam pipe

What is a chemical bond according to valence bond theory

D Structure of Molecules and Molecular Ions On a separate sheet of paper set up the following table with eight columns for each of the molecules molecular ions that are assigned to you your group The central atom of the molecule molecular ion is italicized Molecule or Molecular Ion 1 CH 2 SF 3 H 0 a H O b NH3 c NH t Lewis Structure H H C H H a Gal b PC1 F3 c BrF3 Valence Shell Bonding Electron Electron Pairs Pairs 4 4 d CH e SnH f BF Nonbonding Electron Pairs 0 1 Complete the table as outlined above for the following molecules molecular ions all of which obey the Lewis octet rule Complete those that are assigned by your laboratory instructor g PO h PF3 i AsH3 VSEPR Formula AX g XeOF h SbF6 i SF j SiF4 k H S 1 NH Approx Bond Angle 109 5 2 Complete the table as outlined above for the following molecules molecular ions none of which obey the Lewis octet rule Complete those that are assigned by your laboratory instructor d XeF2 e XeF4 f XeOF Geometric Shape tetrahedral j SnF2 k IFA 1 IFA

Question 4 1 point 1 Listen Which molecule below contains an atom that is sp hybridized OH3C OH H3C O CH3 OHC CH OHAC CHO

Identify the reaction type for each of the following equations a 2H g O2 g 2H O 1 b MgI aq 2 AgNO3 aq 2 Agl s Mg NO3 2 aq c CaCO3 s CaO s CO g

The Lewis structure for the ion 103 should show single bond s double bond s and lone pair s 1 3 12 3 2 9 O 3 0 10 2 1 8 3 0 7

Which of the following elements would form ionic compounds Select one O a Oxygen and neon O b Calcium and oxygen O c Carbon and hydrogen O d Sodium and magnesium

Match the items in the left column to the appropriate blanks in the sentences on the right View Available Hint s fewer structure II structure I more The better Lewis structure is H C S Structure I charges because it has H 1 H S C Structure II Reset Help atoms with nonzero

Here are four sketches of substances Each sketch is drawn as if a sample of the substance were under a microscope so powerful that individual atoms could b seen Decide whether each sketch shows a sample of an element a compound or a mixture Substance X element O compound O mixture Substance Z O element O compound Omixture Substance Y element compound mixture Substance T element O compound Omixture 15 A

Draw the Lewis structure for CO32 including any valid resonance structures Which of the following statements is TRUE The CO32 ion contains one C O single bond and two C O double bonds O The CO3 ion contains two C O single bond and one C O double bonds The CO3 ion contains three C O double bonds None of them are true The CO3 ion contains three C O single bond

SED THIS Watch KCV 5 4 IWE 5 6 Read Section 5 4 You can on the Review link to access the section in your eText art A Review Constants Periodic Table se formal charge to identify the better Lewis structure between the llowing H H C S Structure I structure I H H S C Structure II atch the items in the left column to the appropriate blanks in ne sentences on the right View Available Hint s The better Lewis structure is because it ha

a sp Question 6 1 point 1 Listen b p SiBr4 OH2CO O NO C 2s d sp d Which compound below would you predict can experience only dispersion forces OSF4 e als 2

MISSED THIS Watch KCV 5 3 IWE 5 2 Read Section 5 3 You can click on the Review link to access the section in your eText Construct a Lewis structure for each of the following molecules Part A PH3 Draw the molecule by placing atoms on the grid and connecting them with bonds Include all lone pairs of electrons i 11 C H O N S P F Br CI Review I Constants Periodic Table 1 X More

ISSED THIS Watch IWE 5 13 Read Section 5 10 You can click on the eview link to access the section in your e Text Part A Identify each molecule or ion as polar or nonpolar Drag the appropriate items to their respective bins View Available Hint s Polar BrF3 BrCl5 SO3 PC13 Nonpolar

In the best Lewis structure for BeBr2 what is the formal charge on the Be atom Question 34 2 5 points 40 Listen 2

Identify the compound with the largest dipole moment in the gas phase OHF OF O LiF O Cl OCIE

Part E Identify the molecular geometry of BrF2 linear trigonal planar bent tetrahedral trigonal pyramidal seesaw T shaped octahedral square pyramidal square planar Submit Request Answer art F Complete previous part s Part G Identify the molecular geometry of IBRA linear trigonal planar bent tetrahedral trigonal pyramidal seesaw T shaped octahedral square pyramidal

He2 0 1 02 5 0 02 01 5 Question 2 1 point Listen Give the electron geometry eg molecular geometry mg and hybridization for NH3 trigonal pyramidal mg tetrahedral sp3 eg trigonal pyramidal mg trigonal pyramidal sp3 eg tetrahedral mg trigonal planar sp eg tetrahedral mg trigonal pyramidal sp

Identify the number of bonding pairs and lone pairs of electrons in water 1 bonding pairs and 2 lone pairs 2 bonding pairs and 2 lone pairs O2 bonding pairs and 3 lone pairs 3 bonding pairs and 2 lone pairs 1 bonding pairs and 1 lone pairs

Which molecule or compound below contains a polar covalent bond OKCI O AgCl OC H4 ONCI 3

Indicate if the following are metals non metals or metalloids 1pt each 1 Cesium 2 Yttrium 3 Tungsten 4 Radon 5 Boron 6 Give the definition of an ionic and covalent bond 2pts Indicate if the following are ionic or covalent 1pt each 7 BaF2 8 Na2CO3 9 NO 10 CCI4 11 Mg OH 2 Write the correct name for the following formulas 1pt each 12 Rb20 13 Sr MnO4 2 14 CO2 15 Fe2O3 16 H O Write the correct formula for the following names of compounds 1pt each 17 Manganese III Sulfide 18 Arsenic trichloride 10 Amm

Predict the bond angles around the indicated atoms in the compound Be sure to consider lone pai where needed to give complete octets 1 H HC F 2 H 2

Determine the molecular geometries of the following molecules a GeH4 b PH3 c CHCl3 d NO 7

Determine whether each diatomic molecule is polar or nonpolar a HBr b Cl c N d CO d HF

Which bond below is strongest The number in parentheses is the bond length OH CI 127 pm OH F 92 pm OH I 161 pm OH O 96 pm 11

x Incorrect Br G G Choose the major product OH NaOH 1 OH Your answer is incorrect Choose the minor product s OH No minor products expected

Give the hybridization for the O in OCI2 Osp O sp sp d

Classify each of the following as an atomic orbital hybrid orbital or molecular orbital a sp b p C 72s d sp d e 01s

Question 7 1 point Listen A Determine the electron geometry eg molecular geometry mg and polarity of SF4 O eg octahedral mg tetrahedral polar eg tetrahedral mg tetrahedral polar eg octahedral mg trigonal bipyramidal nonpolar eg trigonal bipyramidal mg see saw polar

Which compound below would you predict can experience only dispersion forces SF4 N13 H CO SiBr4

What is the a NO hybridization of nitrogen in each of the following ions and molecules b NO c N O d NO3

geometry OICI 3 SiF4 OPH 3 OPCI5 O BrF5 Question 5 1 point 4 Listen Which compound below contains polar bonds and has a permanent dipole moment AsCl5 SiF4 O CO BeCl2

ions is are FALSE Select all False Charges on ions must be explicitly shown A magnesium ion with a 2 charge has no electron dots shown A neutral oxygen atom has two pairs of electron dots and two unpaired dots shown The chloride ion with a 1 charge has seven valence electrons dots shown The sodium ion has eight valence electron dots shown Question 11 1 point Listen LOIS List the following compounds in decreasing electronegativity difference Cl HCI KCI HCI KCI

List the number of total electron groups the number of bonding groups and the number of lone pairs on the central atom respectively for the following molecular geometry shown here 06 4 0 6 6 0 6 6 2 6 4 2

Which compound below has the smallest dipole moment CF2C12 CF3Cl CFA

The compound ICI contains polar covalent bonds with partial negative charges on the I atoms metallic bonds ionic bonds polar covalent bonds with partial negative charges on the Cl atoms nonpolar covalent bonds Question 3 1 point Listen Arrange the elements in order of increasing electronegativity

Which compound below has the same shape as BeH2 OCS CS2 OH 0 HCN

Which pair of atoms forms the most polar bond OC and H C and O ON and O ON and F OC and F

Which bond is the most polar OC N C O OC F OC P C C

1 4 pts Circle the nucleophile in each reaction and draw arrows to show electron motion CH CH I OH CH CH OH 1

Which molecule or ion below has the same approximate geometry as NC13 IBr3 BrlO3 SO3 COCI

Draw the Lewis structure for acetamide C H NO Acetamide molecules have one carbonyl group and one amino group Be certain you include any lone pair C 0

Rank the following elements according to their ionization energy element germanium gallium silicon sulfur ionization energy Choose one Choose one Choose one Choose one V