Question 1

Following nitrogen (78%)and oxygen (21%),argon is the next most common gas in the atmosphere (less than 1%).Checking the table of elements,you discover that argon is one of a family of atoms with outer shells already full of electrons.How is this related to the fact that these atoms have virtually no biological importance?

Accepted Answer

Argon has an outer shell with ...

Question 2

Which of the following statements is/are true about the pH scale?
-pH 7 has a balanced level of H+ and OH-.

Accepted Answer

A) True 
 B)False

Question 3

Study the chart to determine the relationship between H+ concentration and pH.If you were to create a herbal remedy to decrease excess stomach acid,would you create a solution with a relatively greater or lesser number of hydrogen ions? $$\begin{array} { l l l } 
 \begin{array} { c } 
{ \left[ \mathbf { H } ^ { + } \right] } \
\text {(moles per liter) }
\end{array} & \mathbf { p H } \
0.000001 =  1 \times 10 ^ { - 6 } & 6 \
0.0000001 =  1 \times 10 ^ { - 7 } & 7 \
0.00000001 = 1 \times 10 ^ { - 8 } & 8
\end{array}$$

Accepted Answer

Study of the chart confirms that as pH d...

Question 4

Which substances are on the basic side of the pH scale?

Accepted Answer

A)  baking soda,oven cleaner,and human blood
B)  baking soda,oven cleaner,and urine
C)  tomatoes,oven cleaner,and human blood
D)  beer,vinegar,and black coffee
E)  Great Salt Lake,oven cleaner,and tearsF) A) and C)
G) B) and E)

Question 5

Which of the following statements is/are true about the pH scale?
-The scale indicates the relative concentrations of hydrogen and hydroxide ions in a solution.

Accepted Answer

A) True 
 B)False

Question 6

This system of chemicals,  II2CO3?II++IICO3−\mathrm { II } _ { 2 } \mathrm { CO } _ { 3 } ? \mathrm { II } ^ { + } + \mathrm { IICO } _ { 3 }^-II2​CO3​?II++IICO3−​  ,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 7

An article in a medical journal indicates that researchers have used an isotope 3H to trace a certain metabolic process.From the symbol that is given,we know this is a hydrogen isotope with

Accepted Answer

A)  three protons.
B)  three neutrons.
C)  three electrons.
D)  one proton and two neutrons.
E)  two protons and one neutron.F) A) and B)
G) B) and E)

Question 8

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)  10,000; less
D)  4; less
E)  10,000 moreF) C) and D)
G) C) and E) C

Question 9

Which one is NOT one of the properties of water?

Accepted Answer

A)  The frozen form is more dense than the liquid form.
B)  Water moderates temperature.
C)  Water is a solvent.
D)  Water has a high heat capacity.
E)  Water has a high heat of evaporation.F) A) and B)
G) A) and E) A

Question 10

Which of the following statements is NOT true about electron configurations?

Accepted Answer

A)  If an atom has only one shell,it is complete with two electrons.
B)  If an atom has two or more shells,the octet rule applies.
C)  If an atom has two or more shells,the outer shell is complete with eight electrons.
D)  Atoms with more than eight electrons in the outer shell react by gaining electrons.
E)  Atoms with eight electrons in the outer shell are not reactive.F) B) and D)
G) A) and B)

Question 11

Which of the following statements is/are true about the pH scale?
-Any substance below pH 7 is considered acidic and any substance above pH 7 is considered basic or alkaline.

Accepted Answer

A) True 
 B)False

Question 12

Which property of water allows it stick to surfaces like glass?

Accepted Answer

A)  adhesion
B)  high heat of evaporation
C)  high heat capacity
D)  Water is a good solvent.
E)  The frozen form is less dense than the liquid form.F) A) and B)
G) A) and C)

Question 13

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) None of the above
G) C) and E)

Question 14

Which statement is NOT true about covalent bonds?

Accepted Answer

A)  Covalent bonds form when an electron is completely lost or gained from an atom.
B)  A covalent molecule contains one or more covalent bonds.
C)  A single covalent bond is drawn as a line between two atoms.
D)  A pair of electrons is shared between two atoms for each covalent bond.
E)  Shared electrons allow an atom to complete its valence shell in a covalent molecule.F) B) and D)
G) A) and C)

Question 15

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

Accepted Answer

<img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> Note the diagrams above.The c...

Question 16

Draw two hydrogen atoms using Bohr's model.Now bond them to form a molecule of hydrogen gas.Write the molecular formula.Explain what type of bond you've created and why this is a stable situation.

Accepted Answer

The molecular formula is H₂.A nonpolar c...

Question 17

Which statement is NOT true about polar covalent bonds?

Accepted Answer

A)  When covalent bonds are nonpolar,the electrons are shared fairly equally between the atoms.
B)  Polar covalent bonds are important in the characteristics of water.
C)  Electrons are shared unequally in a polar covalent bond.
D)  The larger atom in a polar bond attracts the electron more strongly than the smaller atom.
E)  The oxygen of a water molecule is electropositive relative to the hydrogen.F) A) and E)
G) A) and B)

Question 18

The periodic table displays the following information about the element phosphorus: 15
P
30.794
Based on this information,which of the following are true statements about phosphorus? Select all that apply.

Accepted Answer

A)  The atomic number of phosphorus is 30.794.
B)  Phosphorus has 15 protons.
C)  Phosphorus has 30.794 electrons.
D)  Phosphorus has a complete valence shell.
E)  Phosphorus will form chemical bonds with other elements.F) C) and D)
G) A) and B)

Question 19

Draw several (5 or 6)individual,unbonded water molecules.Simulate what happens when table salt (Na+Cl-)is added to water.Use the model you created to explain why salt is added to the roads in a "snowy," cold climate.

Accepted Answer

<img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> There is an attraction of positively ch...

Question 20

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 hydrogen bonding is shown as dotted lines between the water molecules.Hydrogen bonding is the weak attraction between a covalently bonded hydrogen atom and an electronegative atom taking part in another covalent bond.It occurs between a partially positive hydrogen in one water molecule and a partially negative oxygen in another water molecule.The hydrogen has a partially positive charge and the oxygen has a partially negative charge because of the unequal sharing of electrons.

Exam 2: Basic Chemistry

Correct Answer
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Argon has an outer shell with ...
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Which of the following statements is/are true about the pH scale? -pH 7 has a balanced level of H⁺ and OH^-.

Correct Answer
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Correct Answer
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Study of the chart confirms that as pH d...
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Which substances are on the basic side of the pH scale?

Correct Answer
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Which of the following statements is/are true about the pH scale? -The scale indicates the relative concentrations of hydrogen and hydroxide ions in a solution.

Correct Answer
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This system of chemicals, $\mathrm { II } _ { 2 } \mathrm { CO } _ { 3 } ? \mathrm { II } ^ { + } + \mathrm { IICO } _ { 3 }^-$ ,act as a buffer in the blood.If hydrogen ions are added to blood which of the following reactions would occur?

Correct Answer
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An article in a medical journal indicates that researchers have used an isotope ³H to trace a certain metabolic process.From the symbol that is given,we know this is a hydrogen isotope with

Correct Answer
verified

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

Correct Answer
verified
C

Which one is NOT one of the properties of water?

Correct Answer
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A

Which of the following statements is NOT true about electron configurations?

Correct Answer
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Which of the following statements is/are true about the pH scale? -Any substance below pH 7 is considered acidic and any substance above pH 7 is considered basic or alkaline.

Correct Answer
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Which property of water allows it stick to surfaces like glass?

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

Correct Answer
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Which statement is NOT true about covalent bonds?

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

Correct Answer
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Note the diagrams above.The c...
View Answer

Draw two hydrogen atoms using Bohr's model.Now bond them to form a molecule of hydrogen gas.Write the molecular formula.Explain what type of bond you've created and why this is a stable situation.

Correct Answer
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The molecular formula is H₂.A nonpolar c...
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Which statement is NOT true about polar covalent bonds?

Correct Answer
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The periodic table displays the following information about the element phosphorus: 15 P 30.794 Based on this information,which of the following are true statements about phosphorus? Select all that apply.

Correct Answer
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Draw several (5 or 6)individual,unbonded water molecules.Simulate what happens when table salt (Na⁺Cl^-)is added to water.Use the model you created to explain why salt is added to the roads in a "snowy," cold climate.

Correct Answer
verified
There is an attraction of positively ch...
View 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.

Exam 2: Basic Chemistry

Correct AnswerverifiedArgon has an outer shell with ...View AnswerShow Answer

Which of the following statements is/are true about the pH scale? -pH 7 has a balanced level of H+ and OH-.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedStudy of the chart confirms that as pH d...View AnswerShow Answer

Which substances are on the basic side of the pH scale?

Correct AnswerverifiedShow Answer

Which of the following statements is/are true about the pH scale? -The scale indicates the relative concentrations of hydrogen and hydroxide ions in a solution.

Correct AnswerverifiedShow Answer

This system of chemicals, II2CO3?II++IICO3−\mathrm { II } _ { 2 } \mathrm { CO } _ { 3 } ? \mathrm { II } ^ { + } + \mathrm { IICO } _ { 3 }^-II2​CO3​?II++IICO3−​ ,act as a buffer in the blood.If hydrogen ions are added to blood which of the following reactions would occur?

Correct AnswerverifiedShow Answer

An article in a medical journal indicates that researchers have used an isotope 3H to trace a certain metabolic process.From the symbol that is given,we know this is a hydrogen isotope with

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

Which one is NOT one of the properties of water?

Correct AnswerverifiedA

Which of the following statements is NOT true about electron configurations?

Correct AnswerverifiedShow Answer

Which of the following statements is/are true about the pH scale? -Any substance below pH 7 is considered acidic and any substance above pH 7 is considered basic or alkaline.

Correct AnswerverifiedShow Answer

Which property of water allows it stick to surfaces like glass?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which statement is NOT true about covalent bonds?

Correct AnswerverifiedShow Answer

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

Correct Answerverified Note the diagrams above.The c...View AnswerShow Answer

Draw two hydrogen atoms using Bohr's model.Now bond them to form a molecule of hydrogen gas.Write the molecular formula.Explain what type of bond you've created and why this is a stable situation.

Correct Answerverified The molecular formula is H2.A nonpolar c...View AnswerShow Answer

Which statement is NOT true about polar covalent bonds?

Correct AnswerverifiedShow Answer

The periodic table displays the following information about the element phosphorus: 15 P 30.794 Based on this information,which of the following are true statements about phosphorus? Select all that apply.

Correct AnswerverifiedShow Answer

Draw several (5 or 6)individual,unbonded water molecules.Simulate what happens when table salt (Na+Cl-)is added to water.Use the model you created to explain why salt is added to the roads in a "snowy," cold climate.

Correct Answerverified There is an attraction of positively ch...View AnswerShow 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 Answer
verified
Argon has an outer shell with ...
View Answer

Which of the following statements is/are true about the pH scale? -pH 7 has a balanced level of H⁺ and OH^-.

Correct Answer
verified

Correct Answer
verified
Study of the chart confirms that as pH d...
View Answer

Correct Answer
verified

Correct Answer
verified

This system of chemicals, $\mathrm { II } _ { 2 } \mathrm { CO } _ { 3 } ? \mathrm { II } ^ { + } + \mathrm { IICO } _ { 3 }^-$ ,act as a buffer in the blood.If hydrogen ions are added to blood which of the following reactions would occur?

Correct Answer
verified

An article in a medical journal indicates that researchers have used an isotope ³H to trace a certain metabolic process.From the symbol that is given,we know this is a hydrogen isotope with

Correct Answer
verified

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

Correct Answer
verified
C

Correct Answer
verified
A

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Note the diagrams above.The c...
View Answer

Correct Answer
verified
The molecular formula is H₂.A nonpolar c...
View Answer

Correct Answer
verified

Correct Answer
verified

Draw several (5 or 6)individual,unbonded water molecules.Simulate what happens when table salt (Na⁺Cl^-)is added to water.Use the model you created to explain why salt is added to the roads in a "snowy," cold climate.

Correct Answer
verified
There is an attraction of positively ch...
View Answer