chem exam 3 material
What is the correct IUPAC name for MgF₂?
magnesium fluoride
Mg_3P_2
magnesium phosphide
What is the correct IUPAC name for Mn₂S₃?
manganese(III) sulfide
Na_2S
sodium sulfide
What is the correct IUPAC name for SrCl₂?
strontium chloride
What is the correct IUPAC name for TiCl₄?
titanium(IV) chloride
If 5.9 × 10²⁵ molecules of CO₂ are produced in a combustion reaction, what is the mass in kg of CO₂ that is produced?
5.9×1025 molecules of CO2×1 mol6.022×1023 molecules of CO2×44.01 g1 mol×1 kg1000 g=4.3 kg
Determine the molar mass of Ca(OH)₂.
74.10 g/mol The molar mass is the mass per mole of one molecule or formula unit. This can be calculated by adding the atomic mass of each atom in the molecule or formula unit. For example, consider Ca(OH)₂. The atomic mass of calcium is 40.08 g/mol, the atomic mass of oxygen is 16.00 g/mol, and hydrogen has an atomic mass of 1.01 g/mol. Each mole of Ca(OH)₂ contains one mole of calcium, two moles of oxygen, and two moles of hydrogen per formula unit.(40.08g/mol)+(16.00g/mol×2)+(1.01g/mol×2)=74.10g/mol
Which atom in the molecule ClF would have a partial positive charge (δ⁺)? A) Cl B) F C) Both D) Neither
A) Cl Partial charges are determined by the relative electronegativities of the atoms in a molecule; since you are looking for the atom with a positive partial charge, you should choose the atom that is the least electronegative. This is Cl.
What is the correct IUPAC name for Al(NO₂)₃?
aluminum nitrite
Draw the Lewis structure of formaldehyde (H₂CO).
.
Determine the number of moles in 4.21 × 10²³molecules of CaCl₂
0.699 mol CaCL2*4.21x10^23 molecules CaCL2 x (1 mol CaCL2/6.022x10^23 molecules CaCL2) = 0.699 mol CaCL2
write the chemical formula for barium nitride
Ba₃N₂
Write a formula for the ionic compound that forms between each pair of elements. beryllium and nitrogen
Be_3N_2
write the chemical formula for the carbonate ion
CO₃²*⁻*
calcium fluoride
CaF_2
Write a formula for the ionic compound that forms between each pair of elements. calcium and sulfur
CaS
Write the chemical formula for the chlorite ion
ClO₂*⁻*
CuCO_3
Copper (II) Carbonate
write the chemical formula for chromium(iii) cyanide
Cr(CN)₃
iron(II) iodate
Fe(IO_3)_2
iron(III) phosphate
FePO_4
iron(III) chromate
Fe_2(CrO_4)_3
iodine monochloride
ICl
potassium hydroxide
KOH
Enter a formula for the compound that forms between magnesium and each polyatomic ion. hydroxide
Mg(OH)_2
Use Lewis theory to determine the formula for the compound that forms between each of the following pairs of elements. Mg and Br
MgBr_2
Enter a formula for the compound that forms between magnesium and each polyatomic ion. chromate
MgCrO_4
Enter a formula for the compound that forms between magnesium and each polyatomic ion. phosphate
Mg_3(PO_4)_2
Classify each of the following compounds as ionic or molecular. Drag the appropriate items to their respective bins.
Molecular: CO2 and NO2 Ionic: NaNO2 and NaI
nitrogen triiodide
NI_3
Write the chemical formula for lead(II) nitrate
Pb(NO₃)₂
write the chemical formula for tetraphosphorus hexasulfide
P₄S₆
disulfur tetrafluoride
S_2F_4
Write the chemical formula for selenium hexafluoride
SeF₆
SnI_2
Stannous iodide
NH_3
ammonia
Ba(NO_3)_2
barium nitrate
CsBr
cesium bromide
Cr_2O_3
chromium (III) oxide
What is the correct IUPAC name for Cr₂O₃?
chromium(III) oxide
What is the correct IUPAC name for CoCl₂ ?
cobalt(II) chloride
P_2S_3
diphosphorus trisulfide
PbO_2
lead (IV) oxide
write the chemical formula for ammonium phosphide
(NH₄)₃P
A hybrid orbital set is shown below. How many unhybridized p orbitals does it have?
2
Which atom in the C-Cl bond has a partial negative charge (δ⁻)? A) Cl B) C C) Both D) Neither
A) Cl Partial charges are determined by the relative electronegativities of the atoms in a bond; the more electronegative atom, which is Cl, has a partial negative charge.
The skeletal structure of tetracyanoethylene is shown below. Determine the number of sigma (σ) and pi (π) bonds in the molecule.
Remember a single bond = 1 σ; a double bond = 1 σ + 1 π; a triple bond = 1 σ + 2 π. This molecule contains four triple bonds, so 4σ and 8π. It contains one double bond, so 1 σ + 1 π. It contains four single bonds, so there are 4σ. This is a total of *9σ and 9π.*
Mg(C_2H_3O_2)_2
magnesium acetate
PCl_5
phosphorus pentachloride
How many hydrogen atoms are in 0.1488 g of phosphoric acid, H3PO4?
0.1488 g H3PO4 x(1 mol H3PO4 / 98.00 g H3PO4) x (3 mol H/ 1 mol H3PO4) x (6.022x10^23 atoms H/ 1 mol H) = 2.743x10^21 atoms H.
Determine the molar mass of CH₃CH₂OH.
46.08 g/mol
Write a formula for the ionic compound that forms between each pair of elements. barium and nitrogen
Ba_3N_2
What is the correct IUPAC name for CoPO₄?
cobalt(III) phosphate
What is the correct IUPAC name for CuSO₃?
copper(II) sulfite
Write a chemical formula for each molecular model. Blue ball= nitrogen atom.
here white balls = 3 blue balls =1 given ; white ball represents hydrogen and blue ball represents nitrogen so formula of compound will be NH_3
What is the correct IUPAC name for Fe(NO₂)₂?
iron(II) nitrite
Pb(Cr_2O_7)_2
lead(IV) dichromate
β-carotene is an antioxidant and a precursor to vitamin A found in carrots and other brightly colored foods. How many π bonds are present in the structure of β-carotene shown?
A double bond = 1 σ bond + 1 π bond. There are a total of 11 double bonds; therefore, there are 11 π bonds present in β-carotene.
How many atoms are in 1.2 mol of carbon?
1.2 mol C x (6.022x10^23atoms/ 1 mol C) = 7.2 × 10²³ atoms of C
How many moles of hydrogen are in 3.06x10^-3 grams of glycine, C₂H₅NO₂?
3.06x10^-3 gC2H5NO2 x (1 mol C2H5NO2 / 75.07 gC2H5NO2) x (5 mol H / 1 mol C2H5NO2) = 2.04x10^-4 mol H
Determine the molar mass of CH₃OCH₃.
46.08 g/mol The molar mass is the mass of one mole of each atom in a molecule or formula unit. This can be calculated by adding the molar mass of each atom in the molecule or formula unit. There are two moles of carbon, six moles of hydrogen, and one mole of oxygen in a mole of each molecule of CH₃OCH₃. The molar mass of carbon is 12.01 g/mol, the molar mass of hydrogen is 1.01 g/mol, and oxygen has a molar mass of 16.00 g/mol. (12.01gmol×2)+(1.01gmol×6)+(16.00gmol×1)=46.08gmol
How many π bonds are present in the structure of ibuprofen shown?
A double bond = 1 σ bond + 1 π bond. There are a total of 4 double bonds; therefore, there are 4 π bonds present in ibuprofen.
How many moles of LiBr are in 77.0 grams of LiBr?
Stoichiometry can be used. Since grams of LiBr was provided, that will be the starting point. The molar mass provides the conversion factor. 77.0 g LiBr x (1 mol LiBr/ 86.85 g LiBr) = 0.887 mol LiBr
What is the correct IUPAC name for IrBr₄?
iridium(IV) bromide
KBr
potassium bromide
KI
potassium iodide
SiB_6
silicon hexaboride
SiCl_4
silicon tetrachloride
What is the correct IUPAC name for AgI?
silver *iodide*, NOT IODINE.
Draw the Lewis structure of SCl₂ and then determine the hybridization of the central atom.
sp3 Cl (6 electrons) - S (4 electrons) - Cl (6 electrons)
Draw the Lewis structure of phosphate (PO₄³⁻) by following the octet rule on all atoms and then determine the hybridization of the central atom.
sp3 P in the middle, 4 O bonds with 6 electrons around each O.
Which of the following contains the most moles of atoms? A) 1 g of helium B) 1 g of carbon C) 1 g of uranium D) All contain equal number of atoms E) Not enough information
A) 1 g of helium To convert from grams to moles, you need to divide by the molar mass. Since each of these options has the same mass, dividing by the smallest molar mass will yield the most moles of atoms. Since helium has a lower molar mass (4 g/mol) than carbon (12 g/mol) or uranium (238 g/mol), it must contain the most moles.
What is the shape of the 2p orbitals? A) sphere B) dumbbell C) cloverleaf D) raindrop
A) sphere - wrong- This is a s orbital shape. B) dumbbell - correct C) cloverleaf- wrong- This is a d-orbital shape D) raindrop- wrong- This is p-orbitals have two lobes.
Use Lewis theory to determine the formula for the compound that forms between each of the following pairs of elements. Al and O
Al_2O_3
arsenic pentafluoride
AsF_5
Which atom in the C-N single bond has a partial negative charge (δ⁻)? A) C B) N C) Both D) Neither
B) N Partial charges are determined by the relative electronegativities of the atoms in a molecule; since you are looking for the atom with a positive negative charge, you should choose the atom that is the most electronegative. This is N.
Which atom in the O-C single bond has a partial negative charge (δ⁻)? A) C B) O C) Both D) Neither
B) O Partial charges are determined by the relative electronegativities of the atoms in a bond; the more electronegative atom, which is O, has a partial negative charge.
write the chemical formula for bromine pentachloride
BrCl₅
Which of the following is an example of a covalent bond? A) K - Cl B) Al - Cl C) H - Cl D) Al - Al
C) H - Cl Covalent bonds are typically formed between two nonmetals.
Which of the following bonds is a polar covalent bond? A) Li - Cl B) Cl - Cl C) H - Cl D) Li - Li
C) H - Cl Polar bonds occur between two nonmetals and have a difference in electronegativities of the atoms.
Which of the following is the strongest type of bond? A) a single bond B) a double bond C) a triple bond
C) a triple bond
Use Lewis theory to determine the formula for the compound that forms between each of the following pairs of elements. Ca and Te
CaTe
copper(II) chloride
CuCl_2
Write the chemical formula for the acetate ion
C₂H₃O₂*⁻*
Write the chemical formula for mercury(II) nitrite
Hg(NO₂)₂
Use Lewis theory to determine the formula for the compound that forms between each of the following pairs of elements. K and Te
K_2Te
Li_3P
Lithium phosphide
Enter a formula for the compound that forms between magnesium and each polyatomic ion. cyanide
Mg(CN)_2
Determine the number of sigma (σ) and pi (π) bonds in the molecule shown on the left below.
Remember a single bond = 1 σ; a double bond = 1 σ + 1 π; a triple bond = 1 σ + 2 π. This molecule contains 7 double bonds, so this is 7π bonds and 7σ. This molecule also contains 17 single bonds, so there are 17σ. This is a total of *7π and 24σ.*
RbF
Rubidium fluoride
Write a chemical formula for each molecular model. yellow ball =sulphur atom.
Yellow ball-1 Red balls-2
Write a formula for the ionic compound that forms between each pair of elements. zinc and bromine
ZnBr_2
What is the correct IUPAC name for AlPO₄?
aluminum phosphate
What is the correct IUPAC name for Al₂S₃?
aluminum sulfide
What is the correct IUPAC name for Al₂(SO₃)₃?
aluminum sulfite
Write a chemical formula for each molecular model. black ball =carbon atom
here white balls = 4 black ball =2 Given; white ball represent hydrogen and black ball represents carbon atom so compounds chemical formula will be C_2H_4
BaF_2
barium fluoride
CaCl_2
calcium chloride
What is the correct IUPAC name for Cs₃P?
cesium phosphide