Chapters 3,4,5

Calculate the molar mass of Al(C2H3O2)3?

Al = 27 (or precisely 26.982) C = 12 ( " " 12.011) H = 1 ( " " 1.008) O = 16 ( " " 15.999) so the molar mass would be 27 + 3x((2 x 12) + (3 x 1) + (2 x 16)) = 27 + 3x(24+3+32) = 27 + (3 x 59) = 27 + 177 = 204g

What is the molar mass of pentane if 4.18 × 1016 molecules of pentane weigh 5.00 μg?

5.0 x 10^-6 g divided by 4.18 x 10^16 molecules = 1.196 x 10^-22 g/molecule 1.196 x 10^-22 g/molecule times 6.022 x 10^23 molecules/mole = 72.0 g/mol

Na2HPO4 1 sodium atom, 2 hydrogen atoms, 4 phosphorus atoms, and 4 oxygen atoms. 1 sodium atom, 2 hydrogen atoms, 1 phosphorus atom, and 4 oxygen atoms. 2 sodium atoms, 4 hydrogen atoms, 4 phosphorus atoms, and 4 oxygen atoms. 2 sodium atoms, 1 hydrogen atom, 1 phosphorus atom, and 4 oxygen atoms.

2 sodium atoms, 1 hydrogen atom, 1 phosphorus atom, and 4 oxygen atoms.

How many anions are there in 2.50 g of MgBr2?

2.50 grams MgBr2 (1 mole MfBr2/184.11 grams)(2 mole Br/1 mole MgBr2)(6.022 X 10^23/1 mole Br) 1.64 × 10 22 anions

Give the number of valence electrons for XeI2. Give the number of valence electrons for XeI2. 22 18 24 20 16

22

Identify the number of electron groups around a molecule with a tetrahedral shape. Identify the number of electron groups around a molecule with a tetrahedral shape. 5 2 3 4 1

4

Choose the bond below that is least polar. Choose the bond below that is least polar. P-F C-Br C-F C-I C-Cl

C-I

Identify the compound with covalent bonds. K NaCl KBr Kr CH4

CH4

In which set do all elements tend to form cations in binary ionic compounds? In which set do all elements tend to form cations in binary ionic compounds? S, Cl, Br P, As, Sb Ca, Mn, Sn Na, Al, S

Ca, Mn, Sn

What is the chemical formula for copper(II) phosphate? What is the chemical formula for copper(II) phosphate? Cu2P Cu2PO4 Cu3P2 Cu3(PO4)2

Cu3(PO4)2

Write the formula for copper (II) sulfate pentahydrate. Write the formula for copper (II) sulfate pentahydrate. CuS • 5H2O (CuSO4)5 Cu2S • H2O CuSO4 • 5H2O Cu2SO3 • H5

CuSO4 • 5H2O

Choose a structural formula for hydrogen sulfide. H−S H−H H2S H−S−H

H−S−H

FeCl2

Iron (II) Chloride

The chemical formula for magnesium nitride is The chemical formula for magnesium nitride is MgN2. Mg(NO3)2. Mg(NO2)2. Mg3N2.

Mg3N2

Give the structure for sodium perchlorate. Give the structure for sodium perchlorate. NaClO NaClO3 NaClO2 NaClO4

NaClO4

Which of the following represent the Lewis structure for S2-? Which of the following represent the Lewis structure for S2-? The figure shows an S 2 minus ion with 2 pairs of electrons. The figure shows an S 2 minus ion with 4 pairs of electrons. The figure shows an S 2 minus ion with 1 pair of electrons. The figure shows an S 2 minus ion with 3 pairs of electrons. The figure shows an S 2 minus ion without electrons.

The figure shows an S 2 minus ion with 4 pairs of electrons.

What is the empirical formula for C8H16O4 ? What is the empirical formula for C8H16O4 ? C2H4O CH2O CHO C2H5O CHO2

c2h4o

CaS

calcium sulfide

Carbon tetrafluoride (CF4) is used as a low-temperature refrigerant in refrigerators. What type of bonding occurs between the atoms of a CF4 molecule? View Available Hint(s) covalent metallic ionic

colvalent

Determine the name for N2O5. Determine the name for N2O5. nitrogen (IV) oxide nitrogen oxide nitrogen tetroxide dinitrogen pentoxide nitrogen (II) oxide

dinitrogen pentoxide

Determine the electron geometry, molecular geometry and polarity of SF6. Determine the electron geometry, molecular geometry and polarity of SF6. eg=octahedral, mg=trigonal bipyramidal, nonpolar eg=trigonal bipyramidal, mg=trigonal bipyramidal, nonpolar eg=tetrahedral, mg=tetrahedral, polar eg=trigonal bipyramidal, mg=see-saw, polar eg=octahedral, mg=octahedral, nonpolar

eg=octahedral, mg=octahedral, nonpolar

Determine the electron geometry (eg), molecular geometry (mg) and polarity of XeO3. Determine the electron geometry (eg), molecular geometry (mg) and polarity of XeO3. eg=tetrahedral, mg=trigonal pyramidal, polar eg=trigonal planar, mg=trigonal pyramidal, polar eg=trigonal planar, mg=trigonal planar, nonpolar eg=trigonal bipyramidal, mg=trigonal planar, nonpolar eg=octahedral, mg=tetrahedral, nonpolar

eg=tetrahedral, mg=trigonal pyramidal, polar

Give the name for NaHSO3. Give the name for NaHSO3. monosodium sulfite monosodium sulfate sodium bisulfide sodium bisulfite sodium bisulfate

sodium bisulfite

Identify the shortest bond. Identify the shortest bond. single covalent bond triple covalent bond double covalent bond all of the above bonds are the same length

triple covalent bond

Place the following elements in order of increasing electronegativity. Ba P Li Place the following elements in order of increasing electronegativity. Ba P Li Li < P < Ba Ba < P < Li P < Ba < Li Ba < Li < P P < Li < Ba

Ba < Li < P

Determine the electron geometry (eg) and molecular geometry (mg) of ICl2-. Determine the electron geometry (eg) and molecular geometry (mg) of ICl2-. eg=trigonal bipyramidal, mg=linear eg=octahedral, mg=linear eg=tetrahedral, mg=trigonal pyramidal eg=trigonal bipyramidal, mg=trigonal planar eg=tetrahedral, mg=bent

eg=trigonal bipyramidal, mg=linear

Determine the electron geometry (eg) and molecular geometry (mg) of XeF2. Determine the electron geometry (eg) and molecular geometry (mg) of XeF2. eg=trigonal bipyramidal, mg=linear eg=trigonal bipyramidal, mg=bent eg=tetrahedral, mg=linear eg=tetrahedral, mg=bent eg=linear, mg=linear

eg=trigonal bipyramidal, mg=linear

Determine the electron geometry (eg) and molecular geometry (mg) of PF5. Determine the electron geometry (eg) and molecular geometry (mg) of PF5. eg=octahedral, mg=octahedral eg=trigonal bipyramidal, mg=trigonal bipyramidal eg=tetrahedral, mg=trigonal pyramidal eg=trigonal bipyramidal, mg=tetrahedral eg=trigonal planar, mg=octahedral

eg=trigonal bipyramidal, mg=trigonal bipyramidal

Determine the electron geometry (eg) and molecular geometry (mg) of BCl3. Determine the electron geometry (eg) and molecular geometry (mg) of BCl3. eg=trigonal planar, mg=bent eg=tetrahedral, mg=trigonal pyramidal eg=tetrahedral, mg=trigonal planar eg=trigonal bipyramidal, mg= trigonal bipyramidal eg=trigonal planar, mg=trigonal planar

eg=trigonal planar, mg=trigonal planar

Determine the electron geometry (eg), molecular geometry (mg), and polarity of SO3. Determine the electron geometry (eg), molecular geometry (mg), and polarity of SO3. eg= trigonal bipyramidal, mg=trigonal planar, polar eg=tetrahedral, mg=tetrahedral, nonpolar eg=trigonal pyramidal, mg=bent, nonpolar eg=tetrahedral, mg=trigonal pyramidal, polar eg=trigonal planar, mg=trigonal planar, nonpolar

eg=trigonal planar, mg=trigonal planar, nonpolar

What type of bonding occurs in potassium oxide, K2O? View Available Hint(s) covalent metallic ionic

ionic

Write the name for PbS. Write the name for PbS. lead(I) sulfate lead(II) sulfate lead sulfide lead(I) sulfide lead(II) sulfide

lead(II) sulfide

What type of bonding occurs in a sample of pure barium, Ba? In other words, how is one barium atom held to another barium atom? View Available Hint(s) covalent metallic ionic

metallic

The phosphorus atom in PCl5 would be expected to have a The phosphorus atom in would be expected to have a partial positive (δ+) charge. partial negative (δ-) charge. 3- charge. 3+ charge.

partial positive (δ+) charge.

Combustion analysis of naphthalene, a hydrocarbon used in mothballs, produced 8.80 g CO2 and 1.44 g H2O.?

use molar masses to find moles of C & H 8.80 g CO2 @ (1 mole carbon) / (44.0 grams/mol CO2) = 0.20 mol Carbon 1.44 g H2O @ (2 mol Hydrogen) / (18.0 g/mol H2O) = 0.16 mol Hydrogen divide by the smaller to ratio the moles 0.20 mol Carbon / 0.16 = 1.25 mol C 0.16 mol Hydrogen / 0.16 = 1 mol H multiply by four to get whole numbers & your answer is C5H4