Question 1

Which element forms an ionic compound with the formula Na2X?

Accepted Answer

A) magnesium 
B) carbon 
C) iodine 
D) phosphorus 
E) sulfur 
A) magnesium 
B) carbon 
C) iodine 
D) phosphorus 
E) sulfur

Question 2

Selenocysteine is an amino acid that gets incorporated into proteins that serve as antioxidants.Evidence points to a need for a minimum daily dose of selenium of 55 $\mu$g.How many moles of selenocysteine (C3H7NO2Se, 168.00 g /mol) can be synthesized using this amount of selenium?

Accepted Answer

A) 3.3 * 10-7 mol 
B) 7.0*10-7 mol 
C) 3.3 *10-4 mol 
D) 7.0* 10-4 mol 
E) 3.7 * 10-7 mol 
A) 3.3 * 10-7 mol 
B) 7.0*10-7 mol 
C) 3.3 *10-4 mol 
D) 7.0* 10-4 mol 
E) 3.7 * 10-7 mol

Question 3

What is a stimulatory effect, and what types of elements exhibit this effect?

Accepted Answer

Nonessential elements can exhi

Question 4

Which of the following is NOT an essential element?

Accepted Answer

A) C 
B) Kr 
C) I 
D) O 
E) F 
A) C 
B) Kr 
C) I 
D) O 
E) F

Question 5

Which arrangement is correct for increasing atomic radius?

Accepted Answer

A) C $\lt$ N $\lt$F 
B) Rb $\lt$ K$\lt$ Li 
C) Sc $\lt$Ge $\lt$ Br 
D) Se $\lt$ Cu $\lt$ Ca 
E) H $\gt$ He 
A) C $\lt$ N $\lt$F 
B) Rb $\lt$ K$\lt$ Li 
C) Sc $\lt$Ge $\lt$ Br 
D) Se $\lt$ Cu $\lt$ Ca 
E) H $\gt$ He

Question 6

Different concentrations of ions on either side of a cell membrane constitute a concentration cell, which is described by the Nernst equation given below.A cell must expend energy to maintain this concentration gradient by moving ions from one side of the membrane to the other.How much energy must be expended to transport 1 mole of sodium ions across a membrane when the sodium ion concentration is 0.10 M on one side of the membrane and 0.010 M on the other side, and the temperature is 37°C body temperature)?
(Given: Na +  +e -  $\rightarrow$ Na, Eºred= -2.71 V; F = 96,485 C; 1 J =1 C V; R = 8.315 J / mol K)) = E° - InQ

Accepted Answer

The answer of Different concentrations of ions on either side...

Question 7

Nitrogen-fixing bacteria and plants are capable of converting atmospheric nitrogen to ammonia.This process is an example of

Accepted Answer

A) an acid-base reaction. 
B) a precipitation reaction. 
C) an oxidation-reduction reaction. 
D) a dissociation reaction. 
E) ion exchange. 
A) an acid-base reaction. 
B) a precipitation reaction. 
C) an oxidation-reduction reaction. 
D) a dissociation reaction. 
E) ion exchange.

Question 8

Iodine-131 has a half-life of 8.1 days and is used as a tracer for the thyroid gland.If a patient drinks a sodium iodide NaI) solution containing iodine-131, how many days will it take for the concentration of iodine-131 to drop to 5.0% of its initial concentration?

Accepted Answer

A) 19 days 
B) 0.81 day 
C) 8.1 days 
D) 35 days 
E) 4.3 days 
A) 19 days 
B) 0.81 day 
C) 8.1 days 
D) 35 days 
E) 4.3 days

Question 9

Adding fluoride ions to toothpaste and drinking water converts the mineral in tooth enamel, hydroxyapatite, to fluoroapatite.This conversion is beneficial in preventing tooth decay because fluoroapatite

Accepted Answer

A) has a solubility that is less pH dependent. 
B) makes strong hydrogen bonds. 
C) prevents halitosis. 
D) repels decay-producing bacteria. 
E) kills decay-producing bacteria. 
A) has a solubility that is less pH dependent. 
B) makes strong hydrogen bonds. 
C) prevents halitosis. 
D) repels decay-producing bacteria. 
E) kills decay-producing bacteria.

Question 10

Enzymes in plants convert nitrate into ammonia.The unbalanced half-reaction equation is given below.What is the stoichiometric coefficient of water in the balanced reaction equation? 
NO3 -(aq) +H2O(l) + e- + NO2 -(aq) +OH-(aq)

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
E) 4 
A) 0 
B) 1 
C) 2 
D) 3 
E) 4

Question 11

Which of the following is NOT a criterion for use of a compound in intravenous diagnosis or therapy?

Accepted Answer

A) The compound must be soluble in blood if injected intravenously. 
B) The compound must be unstable. 
C) The compound must be stable enough to avoid elimination from the body. 
D) Radionuclides used in medicine must have short half-lives. 
E) Nuclide selection is governed by the toxicity of the parent compound. 
A) The compound must be soluble in blood if injected intravenously. 
B) The compound must be unstable. 
C) The compound must be stable enough to avoid elimination from the body. 
D) Radionuclides used in medicine must have short half-lives. 
E) Nuclide selection is governed by the toxicity of the parent compound.

Question 12

Arrange the following elements in order of increasing size: 15P, 20Ca, 32Ge, 37Rb, 38Sr.

Accepted Answer

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

Question 13

The six most abundant major essential elements account for 99% of the mass of the human body.These include carbon, hydrogen, nitrogen, oxygen, and two other elements.Name them.

Accepted Answer

The answer of The six most abundant major essential elements...

Question 14

Elements in group 18 (V IIIA) are called

Accepted Answer

A) alkali metals. 
B) noble gases. 
C) alkaline earth metals. 
D) halogens. 
E) chalcogens. 
A) alkali metals. 
B) noble gases. 
C) alkaline earth metals. 
D) halogens. 
E) chalcogens.

Question 15

Which of the following statements regarding the use of radionuclides for diagnostic purposes is NOT correct?

Accepted Answer

A) The half-life of the radionuclide should be as long as possible in order to maximize detection. 
B) The radionuclide should be a moderate-energy g emitter. 
C) The radionuclide should accumulate in the tissue or organ under study. 
D) Trace amounts of the radionuclide are used along with much larger amounts of the stable isotope. 
E) Different isotopes are used for different applications. 
A) The half-life of the radionuclide should be as long as possible in order to maximize detection. 
B) The radionuclide should be a moderate-energy g emitter. 
C) The radionuclide should accumulate in the tissue or organ under study. 
D) Trace amounts of the radionuclide are used along with much larger amounts of the stable isotope. 
E) Different isotopes are used for different applications.

Question 16

Give an example of an alkaline earth metal.

Accepted Answer

beryllium, magnesium

Question 17

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

Accepted Answer

A) CBr 
B) CaBr2 
C) Ca2Br 
D) CaBrO 
E) CaB2 
A) CBr 
B) CaBr2 
C) Ca2Br 
D) CaBrO 
E) CaB2

Question 18

Starting with $\Delta$G =$\Delta$G° + RT ln Q and $\Delta$G = -nFE, derive the Nernst equation.

Accepted Answer

Start with @#LAT-DLM&G =@#LAT-DLM&G° + RT ln Q and

Question 19

For which of the following elements is the relative abundance in seawater much larger than in the human body?

Accepted Answer

A) Na 
B) P 
C) C 
D) Ca 
E) N 
A) Na 
B) P 
C) C 
D) Ca 
E) N

Question 20

Which of the following has the smallest atomic radius?

Accepted Answer

A) Ca 
B) K 
C) Sc 
D) Sr 
E) Se 
A) Ca 
B) K 
C) Sc 
D) Sr 
E) Se

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

Which element forms an ionic compound with the formula Na2X?

Selenocysteine is an amino acid that gets incorporated into proteins that serve as antioxidants.Evidence points to a need for a minimum daily dose of selenium of 55 μ\muμ g.How many moles of selenocysteine (C3H7NO2Se, 168.00 g /mol) can be synthesized using this amount of selenium?

What is a stimulatory effect, and what types of elements exhibit this effect?

Which of the following is NOT an essential element?

Which arrangement is correct for increasing atomic radius?

Nitrogen-fixing bacteria and plants are capable of converting atmospheric nitrogen to ammonia.This process is an example of

Iodine-131 has a half-life of 8.1 days and is used as a tracer for the thyroid gland.If a patient drinks a sodium iodide NaI) solution containing iodine-131, how many days will it take for the concentration of iodine-131 to drop to 5.0% of its initial concentration?

Adding fluoride ions to toothpaste and drinking water converts the mineral in tooth enamel, hydroxyapatite, to fluoroapatite.This conversion is beneficial in preventing tooth decay because fluoroapatite

Enzymes in plants convert nitrate into ammonia.The unbalanced half-reaction equation is given below.What is the stoichiometric coefficient of water in the balanced reaction equation? NO3 -(aq) +H2O(l) + e- + NO2 -(aq) +OH-(aq)

Which of the following is NOT a criterion for use of a compound in intravenous diagnosis or therapy?

Arrange the following elements in order of increasing size: 15P, 20Ca, 32Ge, 37Rb, 38Sr.

The six most abundant major essential elements account for 99% of the mass of the human body.These include carbon, hydrogen, nitrogen, oxygen, and two other elements.Name them.

Elements in group 18 (V IIIA) are called

Which of the following statements regarding the use of radionuclides for diagnostic purposes is NOT correct?

Give an example of an alkaline earth metal.

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

Starting with Δ\DeltaΔ G = Δ\DeltaΔ G° + RT ln Q and Δ\DeltaΔ G = -nFE, derive the Nernst equation.

For which of the following elements is the relative abundance in seawater much larger than in the human body?

Which of the following has the smallest 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

Which element forms an ionic compound with the formula Na₂X?

Selenocysteine is an amino acid that gets incorporated into proteins that serve as antioxidants.Evidence points to a need for a minimum daily dose of selenium of 55 $\mu$ g.How many moles of selenocysteine (C₃H₇NO₂Se, 168.00 g /mol) can be synthesized using this amount of selenium?

Enzymes in plants convert nitrate into ammonia.The unbalanced half-reaction equation is given below.What is the stoichiometric coefficient of water in the balanced reaction equation? NO₃ -(aq) +H₂O(l) + e^- + NO₂ -(aq) +OH^-(aq)

Arrange the following elements in order of increasing size: ₁₅P, ₂₀Ca, ₃₂Ge, ₃₇Rb, ₃₈Sr.

Starting with $\Delta$ G = $\Delta$ G° + RT ln Q and $\Delta$ G = -nFE, derive the Nernst equation.