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Unit 2A Chemistry Review Flashcards | StudBud
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Unit 2A Chemistry Review
Unit 2A Chemistry Review
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A review quiz for the Chapter 2 Test.
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Questions
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Answers
1
These are dissolved compounds that help keep pH levels constant.
Buffer
Acids
Bases
Enzymes
2
An ion is...
An atom that does not have a charge.
An atom that has only 1 electron.
A molecule that has a charge.
An atom that has a charge.
3
What is cohesion?
When water sticks to water.
When water dissolves a substance.
When water travels up a narrow tube.
When water sticks to a solid.
4
What is the atomic number of lithium?
10
3
4
7
5
Solutions that contain very high concentration of H
+
ions are
enzymes
acids
neutral
bases
6
What is the maximum # of electrons found in the 2nd energy level of an atom?
2
4
8
18
7
Which of the following statements about enzymes is NOT true?
Enzymes work best at a specified pH.
All enzymes have the same shape as their substrates.
Enzymes are proteins.
The shape of an enzyme allows it to do its job.
8
Due to a difference in charges in a causing a partial negative & partial positive charge a molecule can be classified as
Polar
An acid
Neutral
Non-polar
9
Why are steroids classified as a type of lipid?
Steroids are made of fatty acids.
Steroids always mix with water.
Steroids are a type of oil.
Steroids won't dissolve in water.
10
The substance an enzyme acts upon is called
a product
an active site
a substrate
a reactant
11
How many total atoms are in the following chemical formula: H
2
CO
3
?
12
6
3
5
12
Solutions that contain very high concentrations of OH
-
ions are
acids
enzymes
bases
neutral
13
An ion is...
An atom that has a charge.
An atom that has only 1 electron.
A molecule that has a charge.
An atom that does not have a charge.
14
What is the monomer of a lipid?
nucleotide
monosaccharide
amino acid
fatty acid
15
How many protons does Lithium contain?
7
4
3
10
16
A covalent bond is formed as the result of
sharing a pair of protons
transferring electrons
sharing a pair of electrons
transferring protons
17
Which of the following is used for energy storage and structural purposes?
carbohydrates
lipids
proteins
nucleic acids
18
If an atom contains 11 protons and 12 neutrons, its atomic number is
23
1
12
11
19
What is cohesion?
When water travels up a narrow tube.
When water sticks to a solid.
When water dissolves a substance.
When water sticks to water.
20
Which of the following is a weak base?
pH 4.1
pH 5.6
pH 11.1
pH 7.8
21
A monosaccharide is a
carbohydrate
nucleic acid
lipid
protein
22
The 3 parts of a nucleotide are
Carbon, Hydrogen, and Oxygen
A carboxyl group, hydrocarbon group, and a wax
A nitrogenous base, a 5-carbon sugar, and a phosphate group
Triglycerides, oils, and steroids
23
What is the name of the chemical that is acted upon by an enzyme?
Product
Substrate
Reactant
Active site
24
When a water molecule sticks to a solid surface, this action is known as
capillarity
surface tension
cohesion
adhesion
25
How many hydrogen atoms are in the following chemical formula: H
2
CO
3
?
3
2
1
0
26
A covalent bond is formed as the result of
sharing a pair of protons
transferring electrons
transferring protons
sharing a pair of electrons
27
Why is the element carbon so important to the chemistry of life?
It is very versatile because it can make 4 covalent bonds.
It is very versatile because it can bond with water.
It is very versatile because it can bond to oxygen.
It is very versatile because it can make 2 ionic bonds.
28
What happens to an enzyme when it is denatured?
the activation energy is raised
the activation energy is lowered
the enzyme changes its shape
the enzyme can catalyze more reactions
29
What is the mass number of lithium?
4
7
3
10
30
What type of reaction is shown in this graph?
Homeopathic
Endothermic
Homeothermic
Exothermic
31
What is the monomer of carbohydrates?
monosaccharide
nuecleotide
fatty acid
amino acid
32
An ionic bond is defined as a bond in which
electrons are transferred from one atom to another
atoms are attracted to each other due to similar charges
protons are transferred from one atom to another
electrons are shared between atoms
33
Which molecule stores AND transfers genetic information?
Protein
Deoxyribonucleic acid
Ribonucleic acid
Amino acid
34
A substance formed by the combination of 2 or more elements in definite proportions
element
compound
hydrogen bond
catalyst
35
Which of the following is NOT a chemical bond?
Peptide bond
Hydrogen bond
Ionic bond
Covalent bond
36
What is the monomer of a lipid?
monosaccharide
amino acid
fatty acid
nucleotide
37
What is the monomer of carbohydrates?
monosaccharide
amino acid
fatty acid
nuecleotide
38
A substance formed by the combination of 2 or more elements
enzyme
element
compound
nucleus
39
The activity of an enzyme can be affected by pH.
False
True
40
A pH number is the measurement of the number of
???
ions in a solution.
OH+
H+
OH-
H-
41
What # will tell you the number of protons in an atom?
Atomic #
Mass #
Isotope #
Element #
42
Which of the following substances functions to store and transmit genetic information?
nucleic acids
proteins
lipids
carbohydrates
43
In a water molecule, which side of the molecule is positive?
The oxygen side.
Neither side is positive.
The hydrogen side.
Between the oxygen and hydrogen.
44
What is the monomer of a protein?
nucleotide
fatty acid
amino acid
monosaccharide
45
Enzymes affect the reactions in cells by changing
The products of the reaction
The temperature of the reaction
The speed of the reaction
The pH of the reaction
46
Which of the following is NOT a chemical bond?
Hydrogen bond
Ionic bond
Covalent bond
Peptide bond
47
Which of the following is an inorganic compound?
H2O
C6H12O6
C12H22O11
48
Amino acids is to protein as
fat is to lipid
Sugar is to fat
Simple sugar is to starch
DNA is to RNA
49
Water climbing through a paper towel is an example of
cohesion
capillarity
covalent bonding
adhesion
50
Which of the following pH #'s indicates a strong acid?
pH 8.9
pH 4.5
pH 13.9
pH 2.1
51
Which of the following makes up a molecule of water?
2 hydrogen and 1 oxygen
1 sodium and 1 chlorine
1 hydrogen and 1 oxygen
1 hydrogen and 2 oxygen
52
If an atom has an atomic of 14 and a mass # of 21, how many electrons does the atom have?
14
7
28
21
53
What is the best description of activation energy?
Heat released as the reaction proceeds.
Heat added to initiate a reaction.
Heat stored within the reactant molecules.
Heat stored within the product molecules.
54
A pH of 4 is called
a base
neutral
an acid
55
The space surrounding the nucleus of an atom contains...
neutrons
electrons
protons
hydrogen bonds
56
Why are steroids classified as a type of lipid?
Steroids are made of fatty acids.
Steroids won't dissolve in water.
Steroids always mix with water.
Steroids are a type of oil.
57
If an atom contains 3 protons, 4 neutrons, and 3 electrons, its mass number will be
11
4
7
3
58
The substance an enzyme acts upon is called
an active site
a substrate
a reactant
a product
59
The activity of an enzyme can be affected by temperature.
True
False
60
Which of the following statements about enzymes is NOT true?
The shape of an enzyme allows it to do its job.
Enzymes work best at a specified pH.
All enzymes have the same shape as their substrates.
Enzymes are proteins.
61
The location on an enzyme where the substrate will bind.
Secondary structure
Active site
Reactive site
Tertiary structure
62
The most essential element that forms biological moleucles is
water
hydrogen
nitrogen
carbon
63
A substance that "likes" water (will interact with water) is called...
nonpolar
hydrophobic
hydroreactive
hydrophillic
64
Enzymes are "used up" during a reaction
False
True
65
The part of the enzyme where the substrate binds is called the
inhibition site
catalyst site
reactive site
active site
