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

The answer of Following nitrogen (78%)and oxygen (21%),argon is the...

Question 2

The scale ranges from 1 to 15.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following would be a proposed mechanism by which stomach antacids work?

Accepted Answer

A)  Antacids dilute the solution,therefore lowering the pH.
B)  Antacids are bases and by definition can absorb H+ out of a solution.
C)  Antacids are bases and by definition can absorb OH- out of a solution.
D)  Antacids contain mostly water and so they neutralize the solution.E) None of the above
F) C) and D)

Question 4

Which is NOT true about the electrical charges in chemistry?

Accepted Answer

A)  Protons carry a positive charge.
B)  In an atom,the number of protons and neutrons must be equal.
C)  An atom is neutral when the positive and negative charges balance.
D)  An ion contains one or more positive or negative charges.E) A) and C)
F) A) and D)

Question 5

Which statement is NOT true about polar covalent bonds?

Accepted Answer

A)  Most covalent bonds are nonpolar,with electrons 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) C) and D)
G) B) and C)

Question 6

How many elements are required to form a molecule?

Accepted Answer

A)  at least 2
B)  at least 3
C)  at least 4
D)  at least 5
E)  only 1F) B) and E)
G) A) and D)

Question 7

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 outer electron shell in a covalent molecule.F) A) and D)
G) A) and E)

Question 8

Which one is NOT one of the properties of water?

Accepted Answer

A)  the frozen form is more dense than the liquid form
B)  the frozen form is less dense than the liquid form
C)  water is a solvent
D)  water has a high heat capacity
E)  water has a high heat of evaporationF) B) and D)
G) All of the above

Question 9

If the atomic number of an element is 6 and the atomic mass is 12.01,how many protons are there in the nucleus?

Accepted Answer

A)  12
B)  6
C)  24
D)  52E) B) and D)
F) None of the above

Question 10

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

Question 11

If you place the corner of a paper towel into a droplet of water the water moves across the paper towel.Which of the following would explain the movement of the water?

Accepted Answer

A)  surface tension
B)  cohesion
C)  adhesion
D)  both cohesion and adhesionE) A) and B)
F) A) and C)

Question 12

Which of the following concept circles best depicts the relationship between molecules and compounds (c = compound and m = molecule) . A. 
 ?.
  C.

Accepted Answer

A)  Option A
B)  Option B
C)  Option C IncorrectD) B) and C)
E) None of the above

Question 13

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

Accepted Answer

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

Question 14

What is the maximum number of electrons that will be in the 1st valence shell?

Accepted Answer

A)  2
B)  1
C)  3
D)  6
E)  8F) D) and E)
G) C) and D)

Question 15

Which statement is NOT true about subatomic particles?

Accepted Answer

A)  Protons are found in the nucleus.
B)  Neutrons have no electrical charge.
C)  Electrons contain much less mass than neutrons.
D)  Electrons are found in orbitals around the nucleus.
E)  All electrons in an atom contain the same amount of energy.F) B) and D)
G) None of the above

Question 16

Which property of water allows it to act as a transport medium?

Accepted Answer

A)  cohesion
B)  high heat of evaporation
C)  high heat capacity
D)  water is solvent
E)  the frozen form is less dense than the liquid formF) B) and D)
G) B) and C)

Question 17

If an element contains 8 electrons how many electrons will be placed in the 2nd valence shell?

Accepted Answer

A)  6
B)  2
C)  8
D)  5
E)  11F) A) and C)
G) B) and D)

Exam 2: Basic Chemistry

If you place the corner of a paper towel into a droplet of water the water moves across the paper towel.Which of the following would explain the movement of the water?

Correct Answer
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Which of the following concept circles best depicts the relationship between molecules and compounds (c = compound and m = molecule) . A. ?. C.

Correct Answer
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Which one is NOT one of the properties of water?

Correct Answer
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If the atomic number of an element is 6 and the atomic mass is 12.01,how many protons are there in the nucleus?

Correct Answer
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How many elements are required to form a molecule?

Correct Answer
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The scale ranges from 1 to 15.

Correct Answer
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Which of the following would be a proposed mechanism by which stomach antacids work?

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

Correct Answer
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Which statement is NOT true about covalent bonds?

Correct Answer
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Which statement is NOT true about polar covalent bonds?

Correct Answer
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What is the maximum number of electrons that will be in the 1st valence shell?

Correct Answer
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Which property of water allows it to act as a transport medium?

Correct Answer
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Correct Answer
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Which statement is NOT true about subatomic particles?

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
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Which is NOT true about the electrical charges in chemistry?

Correct Answer
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If an element contains 8 electrons how many electrons will be placed in the 2nd valence shell?

Correct Answer
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Exam 2: Basic Chemistry

If you place the corner of a paper towel into a droplet of water the water moves across the paper towel.Which of the following would explain the movement of the water?

Correct AnswerverifiedShow Answer

Which of the following concept circles best depicts the relationship between molecules and compounds (c = compound and m = molecule) . A. ?. C.

Correct AnswerverifiedShow Answer

Which one is NOT one of the properties of water?

Correct AnswerverifiedShow Answer

If the atomic number of an element is 6 and the atomic mass is 12.01,how many protons are there in the nucleus?

Correct AnswerverifiedShow Answer

How many elements are required to form a molecule?

Correct AnswerverifiedShow Answer

The scale ranges from 1 to 15.

Correct AnswerverifiedShow Answer

Which of the following would be a proposed mechanism by which stomach antacids work?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which statement is NOT true about covalent bonds?

Correct AnswerverifiedShow Answer

Which statement is NOT true about polar covalent bonds?

Correct AnswerverifiedShow Answer

What is the maximum number of electrons that will be in the 1st valence shell?

Correct AnswerverifiedShow Answer

Which property of water allows it to act as a transport medium?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which statement is NOT true about subatomic particles?

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 AnswerverifiedShow Answer

Which is NOT true about the electrical charges in chemistry?

Correct AnswerverifiedShow Answer

If an element contains 8 electrons how many electrons will be placed in the 2nd valence shell?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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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

Correct Answer
verified

Correct Answer
verified