CH 2 Practice Test by Uc8iWE

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									CH 2 Practice Test

Student: ___________________________________________________________________________

1. The smallest particle of an element that has the chemical characteristics of that element is a(n)

A. neutron.
B. proton.
C. electron.
D. atom.
E. electron cloud.



2. Subatomic particles located in the nucleus of an atom are called

A. protons.
B. neutrons.
C. electrons.
D. orbitals.
E. Both protons and neutrons are correct names.



3. The atomic number of an atom is equal to

A. the number of neutrons in the atom.
B. the number of protons in the atom.
C. the sum of the number of protons plus the number of neutrons.
D. the sum of the number of protons plus the number of electrons.
E. the sum of the number of neutrons plus the number of electrons.



4. The chemical behavior of an atom is largely determined by

A. the number of neutrons it has.
B. the size of its nucleus.
C. the electrons closest to the nucleus.
D. the size of neutrons it has.
E. its outermost electrons.
5. When the outermost electrons are transferred or shared between atoms,

A. they become radioactive.
B. the atoms become a different element.
C. the atomic numbers of the atoms change.
D. chemical bonding occurs.
E. the atoms become a different element and the atomic numbers of the atoms change.



6. When one atom loses an electron and another atom accepts that electron a(n) __________ bond between the
two atoms results.

A. covalent
B. hydrogen
C. ionic
D. explosive
E. radioactive



7. Covalent bonds occur when

A. one atom loses an electron.
B. two substances dissociate in water.
C. two atoms share electrons.
D. ions are formed.
E. one atom gains an electron.



8. Which of the following is TRUE of hydrogen bonds?

A. Hydrogen bonds form because of the weak attraction between the positive end of one polar molecule and the
negative end of another polar molecule.
B. Electrons are shared or transferred from one polar molecule to another polar molecule.
C. The hydrogen bond formed between two polar molecules is stronger than either an ionic or covalent bond.
D. Hydrogen bonds between different polar parts of a single large molecule are important for holding the
molecule in its normal three dimensional shape.
E. Both hydrogen bonds form because of the weak attraction between the positive end of one polar molecule
and the negative end of another polar molecule and hydrogen bonds between different polar parts of a single
large molecule are important for holding the molecule in its normal three dimensional shape are true of
hydrogen bonds.
9. If a molecule consists of two or more different kinds of atoms, it is a(n)

A. atom.
B. ion.
C. isotope.
D. compound.
E. Both atom and ion are correct names.



10. Which of the following pairs is incorrect?

A. isotope  the same atom with different #s of neutrons
B. atomic number  determined by the number of protons
C. element  atoms with the same atomic number
D. charge on an ion  determined by the gain or loss of protons
E. type of atom  determined by protons & neutrons



11. A substance that increases the rate at which a reaction proceeds, without itself being changed or depleted is
a

A. catalyst.
B. reactant.
C. buffer.
D. base.
E. product.



12. Enzymes

A. are globular proteins.
B. function as biological catalysts.
C. lower the activation energy of a reaction.
D. can be used to regulate chemical reactions.
E. All of these choices are correct.



13. Substances that donate hydrogen ions (protons) to a solution are called

A. acids.
B. bases.
C. alkaline.
D. salts.
14. Which of these statements is true?

A. Carbohydrates are organic molecules formed from amino acid building blocks.
B. Monosaccharides become bound together by hydrolysis reactions to form polysaccharides.
C. Monosaccharides, disaccharides, and polysaccharides are large inorganic molecules.
D. The building blocks for lipids are nucleotides.
E. Essential amino acids are those that cannot be synthesized by the body.



15. Enzymes function by

A. increasing the activation energy needed to start a chemical reaction.
B. having a specific shape that allows them to bind to particular reactants.
C. each enzyme acting as a catalyst for many different reaction types.
D. greatly decreasing reaction rates.
E. doing all of these.



16. When the hydrogen bonds that maintain a protein's three-dimensional shape are broken, the protein becomes
nonfunctional, and is said to be

A. essential.
B. denatured.
C. structural.
D. unsaturated.
E. saturated.



17. A(n) __________ is formed when two atoms share electrons.

A. ion
B. ionic bond
C. hydrogen bond
D. covalent bond
E. atom



18. Nucleotides are the building blocks for

A. carbohydrates.
B. fats (triglycerides).
C. nucleic acids.
D. proteins.
CH 2 Practice Test Key


1. The smallest particle of an element that has the chemical characteristics of that element is a(n)

a. neutron.
b. proton.
c. electron.
D. atom.
e. electron cloud.


Difficulty: Easy
Seeley - 002 The... #1
Type: Knowledge



2. Subatomic particles located in the nucleus of an atom are called

a. protons.
b. neutrons.
c. electrons.
d. orbitals.
E. Both protons and neutrons are correct names.


Difficulty: Easy
Seeley - 002 The... #2
Type: Knowledge



3. The atomic number of an atom is equal to

a. the number of neutrons in the atom.
B. the number of protons in the atom.
c. the sum of the number of protons plus the number of neutrons.
d. the sum of the number of protons plus the number of electrons.
e. the sum of the number of neutrons plus the number of electrons.


Difficulty: Easy
Seeley - 002 The... #4
Type: Knowledge
4. The chemical behavior of an atom is largely determined by

a. the number of neutrons it has.
b. the size of its nucleus.
c. the electrons closest to the nucleus.
d. the size of neutrons it has.
E. its outermost electrons.


Difficulty: Easy
Seeley - 002 The... #6
Type: Knowledge



5. When the outermost electrons are transferred or shared between atoms,

a. they become radioactive.
b. the atoms become a different element.
c. the atomic numbers of the atoms change.
D. chemical bonding occurs.
e. the atoms become a different element and the atomic numbers of the atoms change.


Difficulty: Easy
Seeley - 002 The... #8
Type: Knowledge



6. When one atom loses an electron and another atom accepts that electron a(n) __________ bond between the
two atoms results.

a. covalent
b. hydrogen
C. ionic
d. explosive
e. radioactive


Difficulty: Easy
Seeley - 002 The... #9
Type: Knowledge
7. Covalent bonds occur when

a. one atom loses an electron.
b. two substances dissociate in water.
C. two atoms share electrons.
d. ions are formed.
e. one atom gains an electron.


Difficulty: Easy
Seeley - 002 The... #14
Type: Knowledge



8. Which of the following is TRUE of hydrogen bonds?

a. Hydrogen bonds form because of the weak attraction between the positive end of one polar molecule and the
negative end of another polar molecule.
b. Electrons are shared or transferred from one polar molecule to another polar molecule.
c. The hydrogen bond formed between two polar molecules is stronger than either an ionic or covalent bond.
d. Hydrogen bonds between different polar parts of a single large molecule are important for holding the
molecule in its normal three dimensional shape.
E. Both hydrogen bonds form because of the weak attraction between the positive end of one polar molecule
and the negative end of another polar molecule and hydrogen bonds between different polar parts of a single
large molecule are important for holding the molecule in its normal three dimensional shape are true of
hydrogen bonds.


Difficulty: Easy
Seeley - 002 The... #16
Type: Knowledge



9. If a molecule consists of two or more different kinds of atoms, it is a(n)

a. atom.
b. ion.
c. isotope.
D. compound.
e. Both atom and ion are correct names.


Difficulty: Easy
Seeley - 002 The... #18
Type: Knowledge
10. Which of the following pairs is incorrect?

a. isotope  the same atom with different #s of neutrons
b. atomic number  determined by the number of protons
c. element  atoms with the same atomic number
D. charge on an ion  determined by the gain or loss of protons
e. type of atom  determined by protons & neutrons


Difficulty: Easy
Seeley - 002 The... #21
Type: Knowledge



11. A substance that increases the rate at which a reaction proceeds, without itself being changed or depleted is
a

A. catalyst.
b. reactant.
c. buffer.
d. base.
e. product.


Difficulty: Easy
Seeley - 002 The... #31
Type: Knowledge



12. Enzymes

a. are globular proteins.
b. function as biological catalysts.
c. lower the activation energy of a reaction.
d. can be used to regulate chemical reactions.
E. All of these choices are correct.


Difficulty: Easy
Seeley - 002 The... #32
Type: Knowledge
13. Substances that donate hydrogen ions (protons) to a solution are called

A. acids.
b. bases.
c. alkaline.
d. salts.


Difficulty: Easy
Seeley - 002 The... #37
Type: Knowledge



14. Which of these statements is true?

a. Carbohydrates are organic molecules formed from amino acid building blocks.
b. Monosaccharides become bound together by hydrolysis reactions to form polysaccharides.
c. Monosaccharides, disaccharides, and polysaccharides are large inorganic molecules.
d. The building blocks for lipids are nucleotides.
E. Essential amino acids are those that cannot be synthesized by the body.


Difficulty: Hard
Seeley - 002 The... #45
Type: Knowledge



15. Enzymes function by

a. increasing the activation energy needed to start a chemical reaction.
B. having a specific shape that allows them to bind to particular reactants.
c. each enzyme acting as a catalyst for many different reaction types.
d. greatly decreasing reaction rates.
e. doing all of these.


Difficulty: Easy
Seeley - 002 The... #52
Type: Knowledge
16. When the hydrogen bonds that maintain a protein's three-dimensional shape are broken, the protein becomes
nonfunctional, and is said to be

a. essential.
B. denatured.
c. structural.
d. unsaturated.
e. saturated.


Difficulty: Easy
Seeley - 002 The... #54
Type: Knowledge



17. A(n) __________ is formed when two atoms share electrons.

a. ion
b. ionic bond
c. hydrogen bond
D. covalent bond
e. atom


Difficulty: Easy
Seeley - 002 The... #62
Type: Knowledge



18. Nucleotides are the building blocks for

a. carbohydrates.
b. fats (triglycerides).
C. nucleic acids.
d. proteins.


Difficulty: Easy
Seeley - 002 The... #65
Type: Knowledge

                           Category                 # of Questions
Difficulty: Easy                                         17
Difficulty: Hard                                          1
Seeley - 002 The...                                      18
Type: Knowledge                                          18

								
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