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WorksheetsChapter 2 Review
Total questions: 46
Worksheet time: 23mins
What are the three particles that atoms are made of called?
Protons, neutrons, and isotopes.
Neutrons, isotopes, and electrons.
Positives, negatives, and neutrals.
Protons, neutrons, and electrons.
What particle is found in the space surrounding the nucleus of an atom?
Protons
Electrons
Neutrons
Ions
If an atom contains 3 protons, 4 neutrons, and 3 electrons, what is its MASS number?
3
4
7
10
Isotopes are atoms of the same element with the same number of protons and a different number of
electrons
molecules
neutrons
ions
If an atom contains 11 protons and 12 neutrons, what is its its ATOMIC number?
1
11
12
23
A(n) __________ is a substance formed by the chemical joining of two or more elements in definite amounts?
compound
isotope
nucleus
enzyme
Which of the following statements about a compound is true?
The physical and chemical properties of a compound are usually very different from those of the elements from which it is formed.
Only the physical properties of a compound are usually the same as those of the elements from which it is formed.
Only the chemical properties of a compound are usually the same as those of the elements from which it is formed.
The physical and chemical properties of a compound are usually the same as those of the elements from which it is formed.
A covalent bond is formed as the result of
transferring electrons.
sharing electrons.
transferring protons.
sharing protons.
What type of electron is available to form bonds?
valence
nucleus
ionic
covalent
When an atom loses an electron, it becomes _______ charged.
neutrally
positively
negatively
radioactively
What is an element's MASS number if it contains 12 protons, 11 electrons, and 13 neutrons
12
23
24
25
What is an atom's ATOMIC number if it contains 2 protons, 3 neutrons, and 4 electrons?
2
5
7
9
What is an atoms atomic NUMBER with 30 protons, 27 neutrons, and 28 electrons?
27
28
30
57
What is an atom's MASS number if it contains 25 protons, 16 neutrons, and 50 electrons?
25
75
41
66
Which of the following makes up a molecule of water?
one atom of hydrogen and one atom of oxygen
one atom of sodium and one atom of chlorine
one atom of hydrogen and two atoms of oxygen
two atoms of hydrogen and one atom of oxygen
Water molecules are polar because the
Oxygen is slightly positive and the hydrogen is slightly negative
Oxygen and hydrogen both being slightly positive
Hydrogen is slightly positive and the oxygen is slightly negative
Oxygen and hydrogen both being slightly negative
In a water molecule, shared electrons spend more time around the oxygen atom than the hydrogen atoms. As a result, the oxygen atom is
slightly negative.
very negative.
slightly positive.
very positive.
A solution is a
combination of isotopes.
chemical reaction.
mixture in which the substances are evenly spread out.
mixture in which undissolved substances do not settle out.
When salt is dissolved in water, water is a
reactant.
solution.
solute.
solvent.
While preparing a cell culture, a scientist places a colony of bacteria into distilled water and stirs it up. This mixture of water and living cells would best be called
a solution.
a suspension.
a buffer.
an adhesion.
If the pH of stomach acid and of oven cleaner were measured,
both would be below 7.
both would be above 7.
the pH of stomach acid would be above 7, but the pH of oven cleaner would be below 7.
the pH of stomach acid would be below 7, but the pH of oven cleaner would be above 7.
A map of eastern North America, showing the pH of rainfall in the various states, indicates that the pH of rain in New York State varies from 4.22 to 4.40. According to these figures, the most acidic rainfall in New York State has a pH of
4.22
4.30
4.35
4.40
A substance with a pH of 6 is called
an acid.
a base.
water.
a suspension.
Solutions that have more OH- than H+ ions are
reactants.
acids.
bases.
enzymes.
Compared to most other substance, a great deal of heat is needed to raise the temperature of water by a given amount. This is because water
is an acid.
readily forms solutions.
has a high heat capacity.
acts as a buffer.
A substance with a pH of 9 is considered a(n)
acid
base
neutralized solution
drink
Which is the most acidic?
Solution with a pH of 5
Solution with a pH of 4
Solution with a pH of 10
Solution with a pH of 8
Which is the most basic?
Solution with a pH of 7
Solution with a pH of 3
Solution with a pH of 14
Solution with a pH of 2
Why is carbon so special compared to other elements?
Carbon atoms can bond to one another and form a lot of different structures.
Carbon atoms have four valence electrons and can form quadruple bonds.
Only carbon atoms can form covalent bonds with oxygen and hydrogen.
Only carbon atoms can be dissolved in water solutions and suspensions.
Carbon-12 is the most common isotope of carbon. It has 6 protons, 6 neutrons, and 6 electrons. Of its 6 electrons, 4 are valence electrons. How many covalent bonds can a carbon atom form?
1
4
6
12
Amino acid is to protein as
fat is to lipid.
DNA is to RNA.
sugar is to fat.
simple sugar is to starch.
Which of the following is NOT a monomer?
a glucose molecule
an amino acid
a nucleotide
a protein
What is a disaccharide?
Two sugars
Two proteins
One sugar
One protein
What is the difference between a saturated and an unsaturated fat?
Both have double bonds
Saturated fat has a double bond, which causes the molecule to be bent
Neither have double bonds
Unsaturated fat has a double bond, which causes the molecule to be bent.
What type of sugar does the nucleic acid DNA contain?
Deoxyribose
Ribose
Lactose
Fructose
What are the three parts of the monomer for nucleic acids?
Glycerol backbone, fatty acids, carbon
Monosaccharide, fatty acids, nitrogen
Disaccharide, phosphorus, oxygen
5-carbon sugar, phosphate, nitrogen base
When looking at a nutrition label, it is better to eat saturated fat instead of unsaturated fat.
True
False
In chemical reactions, atoms are
created.
destroyed.
rearranged.
neutralized.
When hydrogen and oxygen combine to form water, water is
a product.
a reactant.
an enzyme.
a catalyst.
What is the process that changes one set of chemicals into another set of chemicals?
cohesion
hydrogen bonding
chemical reaction
dissolving
The energy needed needed to get a reaction started is the
adhesion energy.
activation energy.
cohesion energy.
chemical energy.
If a reaction in one direction releases energy, the reaction in the opposite direction
also releases energy.
absorbs energy.
destroys energy.
cannot occur.
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.
Which of the following statements is true about catalysts?
Catalyst slow down the rate of chemical reactions.
All catalysts are enzymes.
Catalysts are used up during a chemical reaction.
Catalysts lower the activation energy of a chemical reaction.
A substance that speeds up the rate of a chemical reaction is called
a catalyst.
a lipid.
a molecule.
an element.
Enzymes affect the reactions in living cells by changing the
products of the reaction.
speed of the reaction.
temperature of the reaction.
pH of the reaction.
