Inorganic Chemistry Answers

1.     A student was asked to make up a 10% w/w solution of sodium carbonate. Calculate the amount of solute and solvent required to prepare that solution? 

What is the purpose for a company to determine percent yield of a product and not just the theoretical yield?

• The percent yield enables the calculation for the exact amount of product that can be expected, which may help determine profit, an accurate amount of reactant to use, and the efficiency of the system.
• The percent yield enables the calculation of the maximum amount of error that can be expected, which may help determine loss of profit, minimal amount of reactant to use, and the inefficiency of the system.
• The percent yield enables the calculation of the maximum amount of product that can be expected, which may help determine loss of profit, minimal amount of reactant to use, and the inefficiency of the system.

select which of the options

How many mol of NO are produced from a reaction if its mass is 2.05 g?

Periodic Table Reference Sheet

• 1.46 × 10² mol NO
• 6.83 × 10^–2 mol NO
• 1.28 × 10^–1 mol NO
• 6.15 × 10¹ mol NO

it's NOT: 6.15 × 10¹ mol NO or 1.46 × 10² mol NO

If Ag2O decomposes, what is the balanced equation that shows the products formed?

• 2Ag2O(s) → 4Ag(s) + O2(g)
• Ag2O(s) → Ag2(s) + O(g)
• 2Ag2O(s) → 4Ag(s) + 2O(g)
• Ag2O(s) → 2Ag(s) + O(g)

it's NOT: Ag2O(s) → Ag2(s) + O(g)

If Mg and HNO₃ undergo a single-displacement reaction, what balanced equation shows the products formed?

• Mg + HNO₃ → H₂ + Mg(NO₃)₂
• Mg + 2HNO₃ → H₂ + Mg(NO₃)₂
• 2Mg + 2(HNO₃) → 2MgH + 2(NO₃)
• Mg + 2HNO₃ → MgH + (NO₃)

it's NOT: Mg + HNO₃ → H₂ + Mg(NO₃)₂

Refer to the two formulas for glucose.

Formula A: C₁₁H₂₂O₁₁

Formula B: CH₂O

What is difference between the two formulas?

• Formula A is the structural formula for glucose because it shows the arrangement of atoms in the compound.  Formula B is the empirical formula for glucose because it shows the smallest whole-number ratio for the different atoms in the compound.

• Formula A is the molecular formula for glucose because it shows the arrangement of atoms in the compound.  Formula B is the structural formula for glucose because it shows the smallest whole-number ratio for the different atoms in the compound.

• Formula A is the molecular formula for glucose because it shows the actual number of atoms in the compound.  Formula B is the empirical formula for glucose because it shows the smallest whole-number ratio for the different atoms in the compound/

Ethane (C₂H₆) has one C-C bond and six C-H bonds. The electronegativity difference between carbon and hydrogen is less than 0.4.

What is a property of ethane?

• Ethane is nonpolar because it has an even distribution of charge across the entire molecule, which results from the large electronegativity difference between the carbon and hydrogen atoms.
• Ethane is nonpolar because it has an even distribution of charge across the entire molecule, which results from the small electronegativity difference between the carbon and hydrogen atoms. 
• Ethane is nonpolar because it has an uneven distribution of charge across the entire molecule, which results from the small electronegativity difference between the carbon and hydrogen atoms.
• Ethane is nonpolar because it has an uneven distribution of charge across the entire molecule, which results from the large electronegativity difference between the carbon and hydrogen atoms.

it's NOT: the bolded option (bullet point #1)

What is the molecular geometry of a molecule made of two atoms that share one pair of electrons and have no lone electrons pairs?

• trigonal planar
• bent
• linear
• trigonal pyramidal

it's NOT: trigonal planar

Which statement describes a space-filling model of a molecule?

• The radii of the atoms are represented by the symbol of the atom surrounded by dots in the space-filling model.
• The radii of the “ball” that is attached to a “stick” in the space-filling model is equal to the radii of the atoms they represent.
• The radii of the spheres in a space-filling model are proportional in size to the radii of the atoms they represent.
• The radii of the atoms present in the compound determine the length of the bonds in a space-filling model.

it's NOT: The radii of the atoms present in the compound determine the length of the bonds in a space-filling model.

Why are noble gases, like helium and krypton, unlikely to form a bond?

• They have full valence orbitals and already have low energy.
• They always have an equal number of protons and electrons.
• They are nonmetals and gases and therefore their ionization energy is too high to form a bond.
• They do not have valence electrons and therefore cannot form bonds by sharing or trading electrons.

its NOT: They are nonmetals and gases and therefore their ionization energy is too high to form a bond.