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