Question 1

Based on information provided,how is sulfer-35 being used in this experiment?

Accepted Answer

A) as a tag or label 
B) as a reaction product 
C) as a catalyst 
D) as a reaction buffer 
A) as a tag or label 
B) as a reaction product 
C) as a catalyst 
D) as a reaction buffer A

Question 2

Ordinary oxygen has an atomic mass of 16 and an atomic number of 8.This means that the number of neutrons in this type of oxygen is

Accepted Answer

A) 24. 
B) 8. 
C) 16. 
D) not stable. 
E) nonE. 
A) 24. 
B) 8. 
C) 16. 
D) not stable. 
E) nonE. B

Question 3

One mole of a substance contains 6.02 x 1023 molecules.The atomic mass of Li is 3.If you have three moles of Li,how many grams does it weigh?

Accepted Answer

A) 3 
B) 9 
C) 1.806 x 1024 
D) cannot determine from the information provided 
A) 3 
B) 9 
C) 1.806 x 1024 
D) cannot determine from the information provided B

Question 4

Elements that have atoms with the same atomic numbers but different number of neutrons are called

Accepted Answer

A) polymers. 
B) ions. 
C) molecules. 
D) radioactive. 
E) isotopes. 
A) polymers. 
B) ions. 
C) molecules. 
D) radioactive. 
E) isotopes.

Question 5

Which of the following statements about protons is false?

Accepted Answer

A) Protons have one positive charge. 
B) Protons have one Dalton of mass. 
C) Protons are always found in the nucleus of the atom. 
D) The number of protons is the same as the number of electrons. 
A) Protons have one positive charge. 
B) Protons have one Dalton of mass. 
C) Protons are always found in the nucleus of the atom. 
D) The number of protons is the same as the number of electrons.

Question 6

Nonpolar molecules tend to aggregate in water because they are forced to come into close proximity with each other due to

Accepted Answer

A) ionizing interactions. 
B) hydrophilic interactions. 
C) hydrophobic interactions. 
D) dissolving interactions. 
E) sticky interactions. 
A) ionizing interactions. 
B) hydrophilic interactions. 
C) hydrophobic interactions. 
D) dissolving interactions. 
E) sticky interactions.

Question 7

Salt is often used to melt ice on roads during the winter because it lowers the freezing/melting point of water.Based on what you have learned about the nature of chemical bonds and the properties of water,how does salt exert this effect?

Accepted Answer

A) When salt dissolves in water,individual Na+ and Cl- ions break away from the salt lattice and become surrounded by water molecules.Hydrogen bonds are broken,and the salt ions interfere with interactions between H and O.As a result,it is more difficult for water molecules to bond and form ice. 
B) When salt dissolves in water,individual Na+ and Cl- ions break away from the salt lattice and become surrounded by water molecules.Hydrogen bonds are formed,and the salt ions bond with
H and O.As a result,it is more difficult for water molecules to bond and form ice. 
C) When salt dissolves in water,individual Na+ and Cl- ions break away from the salt lattice and become surrounded by water molecules.Hydrogen bonds are broken,and the salt ions bond with
H and O.As a result,it is more difficult for water molecules to bond and form ice. 
A) When salt dissolves in water,individual Na+ and Cl- ions break away from the salt lattice and become surrounded by water molecules.Hydrogen bonds are broken,and the salt ions interfere with interactions between H and O.As a result,it is more difficult for water molecules to bond and form ice. 
B) When salt dissolves in water,individual Na+ and Cl- ions break away from the salt lattice and become surrounded by water molecules.Hydrogen bonds are formed,and the salt ions bond with
H and O.As a result,it is more difficult for water molecules to bond and form ice. 
C) When salt dissolves in water,individual Na+ and Cl- ions break away from the salt lattice and become surrounded by water molecules.Hydrogen bonds are broken,and the salt ions bond with
H and O.As a result,it is more difficult for water molecules to bond and form ice.

Question 8

The reaction (H2 + F2 $\rarr$ 2HF)is an example of a redox reaction.In reality,two half reactions are occurring.The half reaction (H2 $\rarr$ 2H+ + 2e-)is a(n)_______________.

Accepted Answer

A) reduction reaction 
B) oxidation reaction 
C) redox reaction 
D) potential energy reaction 
A) reduction reaction 
B) oxidation reaction 
C) redox reaction 
D) potential energy reaction

Question 9

You have recently discovered a new element,and find that this particular element has seven electrons in its outer energy level.What does this information tell you about the reactivity of this element?

Accepted Answer

A) The element is non-reactive. 
B) The element is mildly reactive. 
C) The element is highly reactive. 
D) You cannot determine reactivity from the information provideD. 
A) The element is non-reactive. 
B) The element is mildly reactive. 
C) The element is highly reactive. 
D) You cannot determine reactivity from the information provideD.

Question 10

If the molecular weight of Tris base is 121.14,how many grams did you use?

Accepted Answer

A) 60.57 
B) 121.14 
C) 242.28 
D) cannot determine from the information provided 
A) 60.57 
B) 121.14 
C) 242.28 
D) cannot determine from the information provided

Question 11

Regardless of its shape,a given orbital may contain no more than

Accepted Answer

A) 1 electron. 
B) 4 electrons. 
C) 8 electrons. 
D) 2 electrons. 
E) 92 electrons. 
A) 1 electron. 
B) 4 electrons. 
C) 8 electrons. 
D) 2 electrons. 
E) 92 electrons.

Question 12

Based on the information provided,you know that acidosis means that

Accepted Answer

A) your dog's blood pH has moved toward the acidic end of the pH scale and has a higher pH value than normal. 
B) your dog's blood pH has moved toward the acidic end of the pH scale and has a lower pH value than normal. 
C) your dog's blood pH has moved toward the basic end of the pH scale and has a higher pH value than normal. 
D) your dog's blood pH has moved toward the basic end of the pH scale and has a lower pH value than normal. 
A) your dog's blood pH has moved toward the acidic end of the pH scale and has a higher pH value than normal. 
B) your dog's blood pH has moved toward the acidic end of the pH scale and has a lower pH value than normal. 
C) your dog's blood pH has moved toward the basic end of the pH scale and has a higher pH value than normal. 
D) your dog's blood pH has moved toward the basic end of the pH scale and has a lower pH value than normal.

Question 13

________ is defined as the negative logarithm of the hydrogen ion concentration in the solution.

Accepted Answer

A) pH 
B) water 
C) temperature 
D) solubility 
A) pH 
B) water 
C) temperature 
D) solubility

Question 14

Two hydrogen atoms and one oxygen atom will combine chemically to form a water molecule.The chemical bonds that hold the molecule together are covalent bonds.These covalent bonds convey a polarity to each water molecule.Simply stated,polarity means that there is a positive side and a negative side to the molecule.The positive side of one water molecule is attracted to the negative side of another water molecule,forming a hydrogen bond.Which of the following pure water properties reflects this type of bonding?

Accepted Answer

A) the ability to act as a buffer 
B) the ability to quench a thirst 
C) the ability to travel through xylem tubes in a plant's vascular system 
D) the ability to form hydrogen and oxygen gases 
E) the ability to conduct electricity 
A) the ability to act as a buffer 
B) the ability to quench a thirst 
C) the ability to travel through xylem tubes in a plant's vascular system 
D) the ability to form hydrogen and oxygen gases 
E) the ability to conduct electricity

Question 15

Bohr proposed that atoms of any kind contain _________ particles.Those located in the nuclear core are called neutrons and protons.

Accepted Answer

A) ionic 
B) molecular 
C) subatomic 
D) tiny 
A) ionic 
B) molecular 
C) subatomic 
D) tiny

Question 16

Based on the information provided,you know that

Accepted Answer

A) acidosis means that your dog's blood pH has dropped from its normal level and to correct the situation an injection of saline is required to reverse the condition. 
B) acidosis means that your dog's blood pH has raised from its normal level and to correct the situation an injection of saline is required to reverse the condition. 
C) acidosis means that your dog's blood pH has dropped from its normal level and to correct the situation an injection of a buffering solution is required to reverse the condition. 
D) acidosis means that your dog's blood pH has raised from its normal level and to correct the situation an injection of a buffer is required to reverse the condition. 
A) acidosis means that your dog's blood pH has dropped from its normal level and to correct the situation an injection of saline is required to reverse the condition. 
B) acidosis means that your dog's blood pH has raised from its normal level and to correct the situation an injection of saline is required to reverse the condition. 
C) acidosis means that your dog's blood pH has dropped from its normal level and to correct the situation an injection of a buffering solution is required to reverse the condition. 
D) acidosis means that your dog's blood pH has raised from its normal level and to correct the situation an injection of a buffer is required to reverse the condition.

Question 17

Which of the following statements about electrons is false?

Accepted Answer

A) An electron has one negative charge. 
B) The mass of an electron is 1/1840 Dalton. 
C) Electrons are always found in the nucleus of the atom. 
D) Electrons are found in an area around the nucleus,called the orbital. 
A) An electron has one negative charge. 
B) The mass of an electron is 1/1840 Dalton. 
C) Electrons are always found in the nucleus of the atom. 
D) Electrons are found in an area around the nucleus,called the orbital.

Question 18

What type of products are made in chemical reactions involving the shifting of atoms of one molecule to another?

Accepted Answer

A) buffers 
B) reactants 
C) compounds 
D) elements 
E) ions 
A) buffers 
B) reactants 
C) compounds 
D) elements 
E) ions

Question 19

There are 92 naturally occurring _______,each made up of atoms which contain a specific number of protons and a different arrangement of electrons.

Accepted Answer

A) minerals 
B) elements 
C) metals 
D) molecules 
A) minerals 
B) elements 
C) metals 
D) molecules

Question 20

Isotopes that decay with a nuclear break-up and emit a significant amount of energy are said to be __________.

Accepted Answer

A) energetic 
B) ionic 
C) radioactive 
D) isotopic 
A) energetic 
B) ionic 
C) radioactive 
D) isotopic

Exam 2: The Nature of Molecules

Based on information provided,how is sulfer-35 being used in this experiment?

Ordinary oxygen has an atomic mass of 16 and an atomic number of 8.This means that the number of neutrons in this type of oxygen is

One mole of a substance contains 6.02 x 1023 molecules.The atomic mass of Li is 3.If you have three moles of Li,how many grams does it weigh?

Elements that have atoms with the same atomic numbers but different number of neutrons are called

Which of the following statements about protons is false?

Nonpolar molecules tend to aggregate in water because they are forced to come into close proximity with each other due to

Salt is often used to melt ice on roads during the winter because it lowers the freezing/melting point of water.Based on what you have learned about the nature of chemical bonds and the properties of water,how does salt exert this effect?

The reaction (H2 + F2 →\rarr→ 2HF)is an example of a redox reaction.In reality,two half reactions are occurring.The half reaction (H2 →\rarr→ 2H+ + 2e-)is a(n)_______________.

You have recently discovered a new element,and find that this particular element has seven electrons in its outer energy level.What does this information tell you about the reactivity of this element?

If the molecular weight of Tris base is 121.14,how many grams did you use?

Regardless of its shape,a given orbital may contain no more than

Based on the information provided,you know that acidosis means that

________ is defined as the negative logarithm of the hydrogen ion concentration in the solution.

Bohr proposed that atoms of any kind contain _________ particles.Those located in the nuclear core are called neutrons and protons.

Based on the information provided,you know that

Which of the following statements about electrons is false?

What type of products are made in chemical reactions involving the shifting of atoms of one molecule to another?

There are 92 naturally occurring _______,each made up of atoms which contain a specific number of protons and a different arrangement of electrons.

Isotopes that decay with a nuclear break-up and emit a significant amount of energy are said to be __________.

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One mole of a substance contains 6.02 x 10²³ molecules.The atomic mass of Li is 3.If you have three moles of Li,how many grams does it weigh?

The reaction (H2 + F2 $\rarr$ 2HF)is an example of a redox reaction.In reality,two half reactions are occurring.The half reaction (H2 $\rarr$ 2H⁺ + 2e^-)is a(n)_______________.