Question 1

Draw the structural formula of a single water molecule.Note the location of partial positive and negative charges.Label the covalent bonds.

Accepted Answer

The answer of Draw the structural formula of a single...

Question 2

A coastal climate is moderated primarily by which of the following properties of water? Water

Accepted Answer

A)  is the universal solvent.
B)  is cohesive and adhesive.
C)  has a high heat of evaporation.
D)  has a high surface tension.E) B) and C)
F) None of the above

Question 3

This system of chemicals,  ,act as a buffer in the blood.If hydrogen ions are added to blood which of the following reactions would occur?

Accepted Answer

A)    H++HCO3−⟶H2CO3\mathrm { H } ^ { + } + \mathrm { HCO } _ { 3 } ^ { - } \longrightarrow \mathrm { H } _ { 2 } \mathrm { CO } _ { 3 }H++HCO3−​⟶H2​CO3​ 
B)    OH+H2CO3⟶HCO3−+H2O\mathrm { OH } + \mathrm { H } _ { 2 } \mathrm { CO } _ { 3 } \longrightarrow \mathrm { HCO } _ { 3 } ^ { - } + \mathrm { H } _ { 2 } \mathrm { O }OH+H2​CO3​⟶HCO3−​+H2​OC) A) and B)
D) undefined

Question 4

Which statement is NOT true about ionic bonds?

Accepted Answer

A)  One atom acts as an electron donor and another atom acts as an electron acceptor.
B)  Electrons are completely lost or gained in ion formation.
C)  An ion has the same number of electrons as a nonionic atom of the same element.
D)  An ionic bond occurs between positive ions and negative ions.
E)  A salt such as NaCl is formed by an ionic reaction.F) None of the above
G) B) and C)

Question 5

The mass number refers to the number of ______ & ______ within an element.

Accepted Answer

A)  protons & neutrons
B)  protons & electrons
C)  electrons & neutrons
D)  protons & molecules
E)  electrons & atomsF) A) and B)
G) A) and E)

Question 6

Draw three water molecules and the hydrogen bonding that may occur between the molecules.Define hydrogen bonding and explain how and why it occurs.

Accepted Answer

The answer of Draw three water molecules and the hydrogen...

Question 7

Both 18O and 16O are found in nature.However,16O is the most common.Therefore,

Accepted Answer

A)  these are different elements.
B)  oxygen atoms can have eight or 10 neutrons.
C)  18O has two additional electrons in its outer shell.
D)  18O is the form of oxygen that provides living cells with life.
E)  only the common form of 16O can bond with hydrogen atoms to form H2O.F) A) and C)
G) C) and D) B

Question 8

An orbital is best described as

Accepted Answer

A)  the electron shell closest to the nucleus.
B)  the outermost electron shell of an atom.
C)  the volume of space in which electrons are most often found.
D)  the original energy level of electrons in photosynthesis.E) None of the above
F) All of the above C

Question 9

All living things are 70 - 90% water.Use this graph to explain what characteristics of water protect living organisms from rapid temperature changes.

Accepted Answer

The answer of All living things are 70 - 90%...

Question 10

Which of the following is/are an atom,an isotope and an ion?

Accepted Answer

A)  H+
B)  2H or deuterium
C)  3H or tritium
D)  H2 or hydrogen gas
E)  All of the choices are atoms,isotopes and ions.F) None of the above
G) All of the above

Question 11

To determine the age of fairly recent fossils and organic artifacts,it is possible to analyze the amounts of the isotopes 14C and 14N,because over time the 14C-which originated in the atmosphere-breaks down into 14N.What net change occurred for this to happen?

Accepted Answer

A)  The 14C lost an electron.
B)  The 14C gained an electron.
C)  The 14C lost a proton.
D)  The 14C gained a proton.
E)  The 14C gained a neutron.F) B) and D)
G) A) and E)

Question 12

Figure:   Bond  Energy (kcal/mol)   Bond  Energy (kcal/mol) H−H104P−O100H−O110 N−O53C−H99 S−H81C−O84C=C146C−C83C=N147C−N70P=O120C−S62C=O170S−S51C=C195\begin{array} { | l c | l c | } \hline 	ext { Bond } & 	ext { Energy (kcal/mol)  } & 	ext { Bond } & 	ext { Energy } ( \mathrm { kcal } / \mathrm { mol } )  \\hline \mathrm { H } - \mathrm { H } & 104 & \mathrm { P } - \mathrm { O } & 100 \\hline \mathrm { H } - \mathrm { O } & 110 & \mathrm {~N} - \mathrm { O } & 53 \\hline \mathrm { C } - \mathrm { H } & 99 & \mathrm {~S} - \mathrm { H } & 81 \\hline \mathrm { C } - \mathrm { O } & 84 & \mathrm { C } = \mathrm { C } & 146 \\hline \mathrm { C } - \mathrm { C } & 83 & \mathrm { C } = \mathrm { N } & 147 \\hline \mathrm { C } - \mathrm { N } & 70 & \mathrm { P } = \mathrm { O } & 120 \\hline \mathrm { C } - \mathrm { S } & 62 & \mathrm { C } = \mathrm { O } & 170 \\hline \mathrm { S } - \mathrm { S } & 51 & \mathrm { C } = \mathrm { C } & 195 \\hline\end{array} Bond H−HH−OC−HC−OC−CC−NC−SS−S​ Energy (kcal/mol)  104110998483706251​ Bond P−O N−O S−HC=CC=NP=OC=OC=C​ Energy (kcal/mol) 1005381146147120170195​​ 
-From the above table,it is apparent that:

Accepted Answer

A)  triple bonds are stronger than double bonds; double bonds are stronger than single bonds.
B)  triple bonds are weaker than double bonds; double bonds are weaker than single bonds.
C)  carbon bonds are stronger than other bonds; hydrogen bonds are always weakest.
D)  carbon forms only single bonds. E) None of the above
F) B) and C)

Question 13

An abandoned Indiana coal mine spoil bank contains chunks of pyrite minerals.Under constant erosion and weathering,the pyrites leech large amounts of sulfuric acid (H2SO4) .The spoil banks are also mixed with large quantities of basic limestone and clay carbonates.What should occur over time?

Accepted Answer

A)  The pH level will drop until all acid has washed out.
B)  The pH level will remain at 7.0 because of constant washing with rain.
C)  The pH level will remain at 7.0 because all acid will be immediately neutralized by bases.
D)  The pH levels will be spotty and vary over time,first more acidic but drifting back toward 7.0.
E)  Bases always dominate over acids.F) A) and B)
G) A) and C)

Question 14

An atom's atomic mass is best described as the mass of

Accepted Answer

A)  the protons it contains.
B)  the neutrons it contains.
C)  electrons in the outermost shell.
D)  protons and neutrons it contains.
E)  protons and electrons it contains.F) C) and E)
G) C) and D)

Question 15

All of the following are examples of damage caused by acid deposition from rain EXCEPT

Accepted Answer

A)  leaching of aluminum from the soil into lakes which results in the formation of toxic methyl mercury from mercury in the lake sediments
B)  weakens trees in the forests and kills seedlings
C)  increased agricultural yields
D)  damage to marble and limestone monumentsE) B) and C)
F) A) and C)

Question 16

A solution with a pH of 6 has ________ times _________ OH- than a solution with a pH of 10.

Accepted Answer

A)  40; more
B)  4000; less
C)  104; less
D)  4; less
E)  10-4 moreF) A) and D)
G) A) and B)

Question 17

A solution with a pH of 7.0 has _______ times ________ H+ than a solution of pH 10.

Accepted Answer

A)  30; more
B)  300; less
C)  103; more
D)  10-3; less
E)  none of these are correct.F) D) and E)
G) A) and E) C

Question 18

Figure: 
-From the above table of radioisotopes and their properties,it is obvious that

Accepted Answer

A)  the longer the half-life,the more energy emitted by the particles.
B)  the longer the half-life,the less energy emitted by the particles.
C)  radioisotopes of the same element must emit the same amount of energy in their emissions and decay at the same rate.
D)  adjusted for time,radioisotopes emit the same amount of energy in their emissions.
E)  energy and half-life are not directly related.F) C) and E)
G) B) and E)

Question 19

Which type of covalent bond is the strongest?

Accepted Answer

A)  single
B)  double
C)  triple
D)  quadruple
E)  all covalent bonds are equal in strengthF) A) and B)
G) None of the above

Question 20

The blood buffer reactions described by H2CO3    
2CO3       H+ + HCO3- indicates that A) scientists are uncertain which direction the equation flows. B) the reaction can flow either direction depending on whether there is an excess of hydrogen or hydroxide ions. C) any reaction in one direction causes an immediate reverse reaction. D) chemicals can swing wildly from acid to basic. E) there is really no difference in chemistry whether a molecule is formed or dissociated." class="answers-bank-image d-inline" rel="preload" > H+ + HCO3- indicates that

Accepted Answer

A)  scientists are uncertain which direction the equation flows.
B)  the reaction can flow either direction depending on whether there is an excess of hydrogen or hydroxide ions.
C)  any reaction in one direction causes an immediate reverse reaction.
D)  chemicals can swing wildly from acid to basic.
E)  there is really no difference in chemistry whether a molecule is formed or dissociated.F) All of the above
G) B) and E)

Exam 2: Basic Chemistry

Draw the structural formula of a single water molecule.Note the location of partial positive and negative charges.Label the covalent bonds.

Correct Answer
verified

A coastal climate is moderated primarily by which of the following properties of water? Water

Correct Answer
verified

Correct Answer
verified

Which statement is NOT true about ionic bonds?

Correct Answer
verified

The mass number refers to the number of & within an element.

Correct Answer
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Draw three water molecules and the hydrogen bonding that may occur between the molecules.Define hydrogen bonding and explain how and why it occurs.

Correct Answer
verified

Both ¹⁸O and ¹⁶O are found in nature.However,¹⁶O is the most common.Therefore,

Correct Answer
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B

An orbital is best described as

Correct Answer
verified
C

All living things are 70 - 90% water.Use this graph to explain what characteristics of water protect living organisms from rapid temperature changes.

Correct Answer
verified

Which of the following is/are an atom,an isotope and an ion?

Correct Answer
verified

To determine the age of fairly recent fossils and organic artifacts,it is possible to analyze the amounts of the isotopes ¹⁴C and ¹⁴N,because over time the ¹⁴C-which originated in the atmosphere-breaks down into ¹⁴N.What net change occurred for this to happen?

Correct Answer
verified

Correct Answer
verified

An abandoned Indiana coal mine spoil bank contains chunks of pyrite minerals.Under constant erosion and weathering,the pyrites leech large amounts of sulfuric acid (H₂SO₄) .The spoil banks are also mixed with large quantities of basic limestone and clay carbonates.What should occur over time?

Correct Answer
verified

An atom's atomic mass is best described as the mass of

Correct Answer
verified

All of the following are examples of damage caused by acid deposition from rain EXCEPT

Correct Answer
verified

A solution with a pH of 6 has times _ OH^- than a solution with a pH of 10.

Correct Answer
verified

A solution with a pH of 7.0 has _ times __ H⁺ than a solution of pH 10.

Correct Answer
verified
C

Figure: -From the above table of radioisotopes and their properties,it is obvious that

Correct Answer
verified

Which type of covalent bond is the strongest?

Correct Answer
verified

The blood buffer reactions described by H₂CO₃ H⁺ + HCO₃- indicates that

Correct Answer
verified

Exam 2: Basic Chemistry

Draw the structural formula of a single water molecule.Note the location of partial positive and negative charges.Label the covalent bonds.

Correct AnswerverifiedShow Answer

A coastal climate is moderated primarily by which of the following properties of water? Water

Correct AnswerverifiedShow Answer

This system of chemicals, ,act as a buffer in the blood.If hydrogen ions are added to blood which of the following reactions would occur?

Correct AnswerverifiedShow Answer

Which statement is NOT true about ionic bonds?

Correct AnswerverifiedShow Answer

The mass number refers to the number of ______ & ______ within an element.

Correct AnswerverifiedShow Answer

Draw three water molecules and the hydrogen bonding that may occur between the molecules.Define hydrogen bonding and explain how and why it occurs.

Correct AnswerverifiedShow Answer

Both 18O and 16O are found in nature.However,16O is the most common.Therefore,

Correct AnswerverifiedB

An orbital is best described as

Correct AnswerverifiedC

All living things are 70 - 90% water.Use this graph to explain what characteristics of water protect living organisms from rapid temperature changes.

Correct AnswerverifiedShow Answer

Which of the following is/are an atom,an isotope and an ion?

Correct AnswerverifiedShow Answer

To determine the age of fairly recent fossils and organic artifacts,it is possible to analyze the amounts of the isotopes 14C and 14N,because over time the 14C-which originated in the atmosphere-breaks down into 14N.What net change occurred for this to happen?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

An abandoned Indiana coal mine spoil bank contains chunks of pyrite minerals.Under constant erosion and weathering,the pyrites leech large amounts of sulfuric acid (H2SO4) .The spoil banks are also mixed with large quantities of basic limestone and clay carbonates.What should occur over time?

Correct AnswerverifiedShow Answer

An atom's atomic mass is best described as the mass of

Correct AnswerverifiedShow Answer

All of the following are examples of damage caused by acid deposition from rain EXCEPT

Correct AnswerverifiedShow Answer

A solution with a pH of 6 has ________ times _________ OH- than a solution with a pH of 10.

Correct AnswerverifiedShow Answer

A solution with a pH of 7.0 has _______ times ________ H+ than a solution of pH 10.

Correct AnswerverifiedC

Figure: -From the above table of radioisotopes and their properties,it is obvious that

Correct AnswerverifiedShow Answer

Which type of covalent bond is the strongest?

Correct AnswerverifiedShow Answer

The blood buffer reactions described by H2CO3 H+ + HCO3- indicates that

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The mass number refers to the number of & within an element.

Correct Answer
verified

Correct Answer
verified

Both ¹⁸O and ¹⁶O are found in nature.However,¹⁶O is the most common.Therefore,

Correct Answer
verified
B

Correct Answer
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C

Correct Answer
verified

Correct Answer
verified

To determine the age of fairly recent fossils and organic artifacts,it is possible to analyze the amounts of the isotopes ¹⁴C and ¹⁴N,because over time the ¹⁴C-which originated in the atmosphere-breaks down into ¹⁴N.What net change occurred for this to happen?

Correct Answer
verified

Correct Answer
verified

An abandoned Indiana coal mine spoil bank contains chunks of pyrite minerals.Under constant erosion and weathering,the pyrites leech large amounts of sulfuric acid (H₂SO₄) .The spoil banks are also mixed with large quantities of basic limestone and clay carbonates.What should occur over time?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A solution with a pH of 6 has times _ OH^- than a solution with a pH of 10.

Correct Answer
verified

A solution with a pH of 7.0 has _ times __ H⁺ than a solution of pH 10.

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

The blood buffer reactions described by H₂CO₃ H⁺ + HCO₃- indicates that

Correct Answer
verified