Question 1

What is the charge on the phosphorus atom when it forms an ionic compound with magnesium?

Accepted Answer

The answer of What is the charge on the phosphorus...

Question 2

The ratio of abundance of major to ultratrace essential elements in the human body is at least roughly a factor of

Accepted Answer

A) 1. 
B) 10. 
C) 100. 
D) 1000. 
E) 100,000. 
A) 1. 
B) 10. 
C) 100. 
D) 1000. 
E) 100,000.

Question 3

The pH of an aqueous sodium fluoride (NaF) solution _____is because_____ .

Accepted Answer

A) 7; sodium fluoride is a simple salt 
B) above 7; fluoride is a weak base 
C) below 7; fluoride reacts with water to make hydrofluoric acid 
D) about 7; fluoride is a weak base but produces hydrofluoric acid, and these two neutralize one another 
E) 0; sodium fluoride is a salt, not an acid or a base 
A) 7; sodium fluoride is a simple salt 
B) above 7; fluoride is a weak base 
C) below 7; fluoride reacts with water to make hydrofluoric acid 
D) about 7; fluoride is a weak base but produces hydrofluoric acid, and these two neutralize one another 
E) 0; sodium fluoride is a salt, not an acid or a base

Question 4

Arrange the following elements in order of increasing first ionization energy: 9F, 12Mg, 15P, 17Cl.

Accepted Answer

The answer of Arrange the following elements in order of...

Question 5

The Mg2+ ion plays a significant role in the human body by

Accepted Answer

A) maintaining osmotic pressure. 
B) forming structure support for the body. 
C) transmitting nerve impulses. 
D) balancing ion flow in the bloodstream. 
E) participating in ATP hydrolysis and ADP phosphorylation. 
A) maintaining osmotic pressure. 
B) forming structure support for the body. 
C) transmitting nerve impulses. 
D) balancing ion flow in the bloodstream. 
E) participating in ATP hydrolysis and ADP phosphorylation.

Question 6

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

Accepted Answer

A) CH4 
B) C2H4 
C) C2H6 
D) C4H10 
E) C6H14 
A) CH4 
B) C2H4 
C) C2H6 
D) C4H10 
E) C6H14

Question 7

Which element may contribute to sudden infant death syndrome SIDS), as it is used as a fire retardant in mattresses?

Accepted Answer

A) bismuth 
B) chromium 
C) boron 
D) aluminum 
E) antimony 
A) bismuth 
B) chromium 
C) boron 
D) aluminum 
E) antimony

Question 8

The isotope 201Th is used in the diagnosis of heart disease.It has a first-order rate constant, k, of 9.49 * 10-3 h-1.What is the half-life for 201Th?

Accepted Answer

A) 73 hr 
B) 0.014 hr 
C) 9.49 * 10-3 hr 
D) 7.3 hr 
E) 1.4 hr 
A) 73 hr 
B) 0.014 hr 
C) 9.49 * 10-3 hr 
D) 7.3 hr 
E) 1.4 hr

Question 9

Why is iodine-131 used effectively to treat thyroid cancer?

Accepted Answer

Iodine in the body i

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

A) 2.5 *10-9 M 
B) 7.1 *10-5 M 
C) 3.5 * 10-5 M 
D) 5.0 * 10-9 M 
E) 4.7 * 10-7 M 
A) 2.5 *10-9 M 
B) 7.1 *10-5 M 
C) 3.5 * 10-5 M 
D) 5.0 * 10-9 M 
E) 4.7 * 10-7 M

Question 11

Plants use urea (CO(NH2)2) as a source of ammonia.The reaction involves hydrolysis.Write a detailed mechanism.

Accepted Answer

CO(NH<sub>2</sub>)2

Question 12

Which of the following statements concerning essential and nonessential elements is NOT correct?

Accepted Answer

A) Essential elements have a beneficial physiological effect. 
B) Essential elements, when missing, impair function. 
C) The function of nonessential elements is not known. 
D) Nonessential elements are not present in humans. 
E) Nonessential elements may have a stimulatory effect in some mammals. 
A) Essential elements have a beneficial physiological effect. 
B) Essential elements, when missing, impair function. 
C) The function of nonessential elements is not known. 
D) Nonessential elements are not present in humans. 
E) Nonessential elements may have a stimulatory effect in some mammals.

Question 13

The concentration of an ultratrace essential element in the body is less than_____ per gram of body mass.

Accepted Answer

A) 1 g 
B) 10 mg 
C) 1 mg 
D) 10  $\mu$ g 
E) 1  $\mu$ g 
A) 1 g 
B) 10 mg 
C) 1 mg 
D) 10  $\mu$ g 
E) 1  $\mu$ g

Question 14

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

Accepted Answer

A) C 
B) O 
C) Cl 
D) S 
E) Se 
A) C 
B) O 
C) Cl 
D) S 
E) Se

Question 15

Plants convert nitrogen into ammonia.This biological nitrogen fixation is effected by enzymes called nitrogenases.The enzymes assist in the transfer of electrons.The unbalanced reaction equation is 
N2 (g) +H+(aq) +e-$\rightarrow$ H2(g) + NH3(aq)
What is the stoichiometric coefficient for the electrons in the balanced reaction equation?

Accepted Answer

A) 1 
B) 2 
C) 4 
D) 6 
E) 8 
A) 1 
B) 2 
C) 4 
D) 6 
E) 8

Question 16

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

Accepted Answer

A) Rb+ 
B) S2- 
C) Al3+ 
D) I- 
E) Ba+ 
A) Rb+ 
B) S2- 
C) Al3+ 
D) I- 
E) Ba+

Question 17

In which of the following molecules/ions is the oxidation state of nitrogen +5?

Accepted Answer

A) N2 
B) NO2 
C) NO -   
D) NH3 
E) NH +  
A) N2 
B) NO2 
C) NO -   
D) NH3 
E) NH +

Question 18

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

Accepted Answer

A) Na2I 
B) NaI2 
C) NaI 
D) Na2I2 
E) Na3I 
A) Na2I 
B) NaI2 
C) NaI 
D) Na2I2 
E) Na3I

Question 19

The concentration of a trace essential element in the body is typically in the range of _____per gram ofbody mass.

Accepted Answer

A) 1  $\mu$ g to 1 mg 
B) 1  $\mu$ g to 10 mg 
C) 10  $\mu$ g to 10 mg 
D) 10  $\mu$ g to 100 mg 
E) 100  $\mu$ g to 100 mg 
A) 1  $\mu$ g to 1 mg 
B) 1  $\mu$ g to 10 mg 
C) 10  $\mu$ g to 10 mg 
D) 10  $\mu$ g to 100 mg 
E) 100  $\mu$ g to 100 mg

Question 20

Which of the following has the largest atomic radius?

Accepted Answer

A) Ba 
B) Hg 
C) Rn 
D) Sr 
E) Hf 
A) Ba 
B) Hg 
C) Rn 
D) Sr 
E) Hf

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

What is the charge on the phosphorus atom when it forms an ionic compound with magnesium?

The ratio of abundance of major to ultratrace essential elements in the human body is at least roughly a factor of

The pH of an aqueous sodium fluoride (NaF) solution _____is because_____ .

Arrange the following elements in order of increasing first ionization energy: 9F, 12Mg, 15P, 17Cl.

The Mg2+ ion plays a significant role in the human body by

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

Which element may contribute to sudden infant death syndrome SIDS), as it is used as a fire retardant in mattresses?

The isotope 201Th is used in the diagnosis of heart disease.It has a first-order rate constant, k, of 9.49 * 10-3 h-1.What is the half-life for 201Th?

Why is iodine-131 used effectively to treat thyroid cancer?

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?

Plants use urea (CO(NH2)2) as a source of ammonia.The reaction involves hydrolysis.Write a detailed mechanism.

Which of the following statements concerning essential and nonessential elements is NOT correct?

The concentration of an ultratrace essential element in the body is less than_____ per gram of body mass.

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

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

In which of the following molecules/ions is the oxidation state of nitrogen +5?

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

The concentration of a trace essential element in the body is typically in the range of _____per gram ofbody mass.

Which of the following has the largest atomic radius?

Matter and Energy an Atomic Perspective

Atoms, Ions, and Molecules the Building Blocks of Matter

Atomic Structure Explaining the Properties of Elements

Chemical Bonding Understanding Climate Change

Bonding Theories Explaining Molecular Geometry

Intermolecular Forces Attractions Between Particles

Stoichiometry Mass Relationships and Chemical Reactions

Aqueous Solutions Chemistry of the Hydrosphere

Thermochemistry Energy Changes in Chemical Reactions

Properties of Gases the Air We Breathe

Properties of Solutions Their Concentrations and Colligative Properties

Thermodynamics Why Chemical Reactions Happen

Chemical Kinetics Clearing the Air

Chemical Equilibrium Equal but Opposite Reaction Rates

Acid-Base Equilibria Proton Transfer in Biological Systems

Additional Aqueous Equilibria Chemistry and the Oceans

Electrochemistry the Quest for Clean Energy

The Solid State a Particulate View

Organic Chemistry Fuels, Pharmaceuticals, and Modern Materials

Biochemistry the Compounds of Life

Nuclear Chemistry the Risks and Benefits

Transition Metals Biological and Medical Applications

Filters

The pH of an aqueous sodium fluoride (NaF) solution _is because_ .

Arrange the following elements in order of increasing first ionization energy: ₉F, ₁₂Mg, ₁₅P, ₁₇Cl.

The isotope ²⁰¹Th is used in the diagnosis of heart disease.It has a first-order rate constant, k, of 9.49 * 10^-3 h^-1.What is the half-life for ²⁰¹Th?

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?

Plants use urea (CO(NH₂)₂) as a source of ammonia.The reaction involves hydrolysis.Write a detailed mechanism.