Question 1

Zinc oxide, a combination of zinc and oxygen, is found in skin ointments.What formula best describes this compound?

Accepted Answer

Zinc oxide is a compound formed from zinc and oxygen, with the chemical formula ZnO, where one zinc atom combines with one oxygen atom.

Question 2

Which of the following elements would you expect to have the lowest first ionization energy?

Accepted Answer

The answer of Which of the following elements would you...

Question 3

The concentration of sodium in the human body is approximately 1.5 mg/g of body mass.What is this concentration in ppm parts per million)?

Accepted Answer

1.5 mg/g is equivalent to 1.5 mg per 1000 mg (since 1 g = 1000 mg), which simplifies to 1.5 parts per thousand. To convert to parts per million (ppm), we multiply by 1000 (since 1 part per thousand is 1000 parts per million), resulting in 1,500 ppm.

Question 4

What is the correct formula for the compound formed between sodium and iodine based on their positions in the periodic table?

Accepted Answer

Sodium (Na) is in group 1 and iodine (I) is in group 17 (also known as group 7 or the halogens). The halogens form -1 ions when they react, so iodine will have a -1 charge. Sodium, being in group 1, will form a +1 ion when it reacts. Therefore, the compound formed between sodium and iodine will be NaI.

Question 5

Which of the following compounds will have the lowest boiling point?

Accepted Answer

The compound with the lowest molecular weight and weakest intermolecular forces typically has the lowest boiling point. Among the given options, CH₂ (D) has the lowest molecular weight and primarily engages in weak van der Waals forces, leading to the lowest boiling point compared to the others which involve heavier halogens.

Question 6

Which of the following is NOT one of the major metals in the human body?

Accepted Answer

Barium (Ba) is not considered a major metal in the human body, unlike Calcium (Ca), Potassium (K), Magnesium (Mg), and Sodium (Na), which play significant roles in various physiological processes.

Question 7

Which element forms an ionic compound with nitrogen that has the formula XN?

Accepted Answer

Aluminum (Al) forms an ionic compound with nitrogen (N) as AlN, where aluminum has a +3 charge and nitrogen has a -3 charge, balancing each other out to form a neutral compound.

Question 8

Which of the following is NOT a common ion of a main group element?

Accepted Answer

The answer of Which of the following is NOT a...

Question 9

Which of the following compounds will have the highest boiling point?

Accepted Answer

PbH₄ has the highest boiling point due to its larger molecular size and greater van der Waals forces compared to the other hydrides in the group.

Question 10

Calcium carbonate is used to form exoskeletons.It has a solubility-product constant of 5.0 *10^-9.What is the molar concentration of calcium ions in a saturated solution of calcium carbonate?

Accepted Answer

The answer of Calcium carbonate is used to form exoskeletons.It...

Question 11

The first ionization energies of phosphorus and of sulfur are 1012 and 1000 kJ/mol.Why is IE₁ for S lower than that of P when the usual trend is for IE to increase across a row?

Accepted Answer

Removing an electron from sulfur, which has a paired electron in one of its p orbitals, reduces electron-electron repulsions. This makes it slightly easier to remove an electron from sulfur compared to phosphorus, where all p electrons are unpaired and thus experience less repulsion.

Question 12

Which of the following is NOT one of the major nonmetals in the human body?

Accepted Answer

Selenium (Se) is a trace element in the human body, not a major nonmetal like Carbon (C), Oxygen (O), Chlorine (Cl), or Sulfur (S).

Question 13

The average concentration of calcium in the human body is 15 mg/g of body mass.What is the mass of calcium in the body of a person weighing 150 lb? (1 lb = 454 g)

Accepted Answer

First, we need to convert the person's weight from pounds to grams:
150 lb * (454 g/1 lb) = 68,100 g

Next, we can calculate the total mass of calcium in the body by multiplying the body mass by the concentration of calcium:
68,100 g * (15 mg Ca / 1 g body mass) = 1,021,500 mg Ca

To convert milligrams to pounds, we need to divide by 453.592:
1,021,500 mg / 453.592 = 2.25 lb

Therefore, the mass of calcium in the body of a person weighing 150 lb is 2.3 lb (rounded to one decimal place), which corresponds to answer choice E.

Question 14

Which of the following compounds will have the lowest boiling point?

Accepted Answer

The compound with the lowest molecular weight typically has the lowest boiling point due to weaker intermolecular forces. Compound A, CH4, has the lowest molecular weight among the options listed.

Question 15

What is the formula for the ionic compound formed when calcium and bromine combine?

Accepted Answer

Calcium forms a +2 ion (Ca²⁺) and bromine forms a -1 ion (Br⁻). To balance the charges, two bromide ions are needed for each calcium ion, resulting in the formula CaBr₂.

Question 16

What is the typical membrane potential in living cells (in mV)?

Accepted Answer

The typical membrane potential in living cells is approximately -70 mV.

Question 17

Which of the following elements would you expect to have the most negative electron affinity?

Accepted Answer

F (Fluorine) is expected to have the most negative electron affinity because it is the most electronegative element, meaning it has a strong tendency to attract electrons to itself.

Question 18

Which element forms an ionic compound with the formula Na₂X?

Accepted Answer

The formula NaS suggests the compound is sodium sulfide, where sodium (Na) is paired with sulfur (S) to form an ionic compound. Sodium (Na) is a metal that loses one electron to form a +1 charge, and sulfur (S) is a non-metal that gains two electrons to form a -2 charge. In sodium sulfide, each sodium ion balances one of the two negative charges of the sulfur ion, resulting in the formula Na2S, which aligns with the given formula NaS when considering the subscript formatting error.

Question 19

Which element forms ionic compounds with the formula XBr₂?

Accepted Answer

Calcium forms ionic compounds with the formula XBr₂ because it has a +2 charge, which balances the -1 charge of each bromide ion.

Question 20

The concentration of chloride in the human body is approximately 19 mg/g of body mass.What is this concentration in ppb parts per billion)?

Accepted Answer

To convert mg/g to ppb, multiply by 10^6 (since 1 mg/g = 1,000,000 ppb). Thus, 19 mg/g = 19 x 10^6 ppb = 1.9 x 10^7 ppb.

Quiz 22: The Main Group Elements Life and the Periodic Table

Zinc oxide, a combination of zinc and oxygen, is found in skin ointments.What formula best describes this compound?

Which of the following elements would you expect to have the lowest first ionization energy?

The concentration of sodium in the human body is approximately 1.5 mg/g of body mass.What is this concentration in ppm parts per million) ?

What is the correct formula for the compound formed between sodium and iodine based on their positions in the periodic table?

Which of the following compounds will have the lowest boiling point?

Which of the following is NOT one of the major metals in the human body?

Which element forms an ionic compound with nitrogen that has the formula XN?

Which of the following is NOT a common ion of a main group element?

Which of the following compounds will have the highest boiling point?

Calcium carbonate is used to form exoskeletons.It has a solubility-product constant of 5.0 *10^-9.What is the molar concentration of calcium ions in a saturated solution of calcium carbonate?

The first ionization energies of phosphorus and of sulfur are 1012 and 1000 kJ/mol.Why is IE₁ for S lower than that of P when the usual trend is for IE to increase across a row?

Which of the following is NOT one of the major nonmetals in the human body?

The average concentration of calcium in the human body is 15 mg/g of body mass.What is the mass of calcium in the body of a person weighing 150 lb? (1 lb = 454 g)

Which of the following compounds will have the lowest boiling point?

What is the formula for the ionic compound formed when calcium and bromine combine?

What is the typical membrane potential in living cells (in mV) ?

Which of the following elements would you expect to have the most negative electron affinity?

Which element forms an ionic compound with the formula Na₂X?

Which element forms ionic compounds with the formula XBr₂?

The concentration of chloride in the human body is approximately 19 mg/g of body mass.What is this concentration in ppb parts per billion) ?

Quiz 22: The Main Group Elements Life and the Periodic Table

Zinc oxide, a combination of zinc and oxygen, is found in skin ointments.What formula best describes this compound?

Which of the following elements would you expect to have the lowest first ionization energy?

The concentration of sodium in the human body is approximately 1.5 mg/g of body mass.What is this concentration in ppm parts per million) ?

What is the correct formula for the compound formed between sodium and iodine based on their positions in the periodic table?

Which of the following compounds will have the lowest boiling point?

Which of the following is NOT one of the major metals in the human body?

Which element forms an ionic compound with nitrogen that has the formula XN?

Which of the following is NOT a common ion of a main group element?

Which of the following compounds will have the highest boiling point?

Calcium carbonate is used to form exoskeletons.It has a solubility-product constant of 5.0 *10-9.What is the molar concentration of calcium ions in a saturated solution of calcium carbonate?

The first ionization energies of phosphorus and of sulfur are 1012 and 1000 kJ/mol.Why is IE1 for S lower than that of P when the usual trend is for IE to increase across a row?

Which of the following is NOT one of the major nonmetals in the human body?

The average concentration of calcium in the human body is 15 mg/g of body mass.What is the mass of calcium in the body of a person weighing 150 lb? (1 lb = 454 g)

Which of the following compounds will have the lowest boiling point?

What is the formula for the ionic compound formed when calcium and bromine combine?

What is the typical membrane potential in living cells (in mV) ?

Which of the following elements would you expect to have the most negative electron affinity?

Which element forms an ionic compound with the formula Na2X?

Which element forms ionic compounds with the formula XBr2?

The concentration of chloride in the human body is approximately 19 mg/g of body mass.What is this concentration in ppb parts per billion) ?

Calcium carbonate is used to form exoskeletons.It has a solubility-product constant of 5.0 *10^-9.What is the molar concentration of calcium ions in a saturated solution of calcium carbonate?

The first ionization energies of phosphorus and of sulfur are 1012 and 1000 kJ/mol.Why is IE₁ for S lower than that of P when the usual trend is for IE to increase across a row?

Which element forms an ionic compound with the formula Na₂X?

Which element forms ionic compounds with the formula XBr₂?