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WorksheetsUnit 2 Test Review
Total questions: 60
Worksheet time: 45mins
Where are electrons located in an atom?
In the space surrounding the nucleus
In the Nucleus
By the neutrons
around the proton
What particle(s) make up an atom?
Proton
Neutron
Electron
All choices are parts that make up an atom.
An atom has 11 protons, 11 electrons, and 9 neutrons. What is the mass number of this atom?
20
22
2
31
If a Chromium atom has 24 protons and 26 neutrons, it would be called
Chromium-50
Chromium-24
Chromium-26
Chromium-42
Isotopes have the same number __________ but different number of ____________.
protons; neutrons
neutrons; protons
protons; electrons
neutrons; electrons
The atomic number is equal to the number of ___________ in an atom.
Protons
Electrons
Neutrons
Protons and Neutrons
Compounds are
a substance formed by the combination of two or more elements in definite proportions.
a substance formed by the hydrolysis of two or more elements in definite proportions.
a substance formed by the combination of four or more elements in indefinite proportions.
indivisible
What type of chemical bond involves the sharing of electrons?
Covalent
Ionic
Altruistic
Hydrogen
What happens to an atom when it loses electrons?
Becomes more positive
Becomes more negative
Its mass increases
Becomes either more negative or positive
Water is
the most abundant compound in living things
the least abundant compound in living things
fairly abundant in living things.
not found in living things.
The hydrogen side of the water of the water molecule is slightly more positive, and the oxygen side is slightly more negative. This means that water molecules are _______.
polar
acidic
neutral
nonpolar
The oxygen side of a water molecule is
slightly more negative.
slightly more positive.
neutral.
smaller than the hydrogen side.
The hydrogen side of a water molecule is
slightly more positive.
slightly more negative.
neutral
bigger than the oxygen side.
An evenly distributed mixture of two or more substances is called a
solution
substrate
enzyme
suspension
When sugar is mixed into koolaid, the sugar is the
solute
solvent
acid
base
When an antacid is dissolved in water, the water is the
solvent
solute
product
reactant
A sample of hydrochloric acid has a varying range of pH between 3.4 and 4.7. What is the most alkaline (basic) that the hydrochloric acid reaches.
4.7
3.4
1.3
7
A substance with a pH of 9 is considered a
base
acid
neutral chemical
compound
A substance with a pH of 3.4 is considered an
acid
base
substrate
reactant
Monosaccharides, disaccharides, and polysaccharides are examples of
carbohydrates
lipids
nucleic acids
proteins
Proteins
help to fight disease.
control the rate of reactions and regulate cell processes.
build tissues such as bone and muscle.
All choices are correct.
What are RNA molecules made of?
Nucleotides
Polysaccharides
Glycerol
Proteins
When atoms are rearranged between substances, it is called a
chemical reaction
enzyme reaction
protein production
activation energy
When hydrogen and oxygen combine to form water, hydrogen and oxygen are
reactants.
products.
destroyed.
neither a product or reactant.
What are the products in this reaction?
N2
H2
N2 and H2
NH3
Chemical reactions
are the processes that change one set of chemicals into a different set of chemicals.
only break down chemicals in a process called hydrolysis.
only combine chemicals in a process called condensation.
destroys certain chemicals and creates certain chemicals.
Activation energy is
the energy needed to start a chemical reaction.
the energy necessary to cause a chemical reaction to stop.
the energy necessary to hydrolyze water.
the energy necessary to cause adhesion to happen.
True/False - All enzymes are the same shape as their substrate.
False
True
True/False - Enzymes work best at a specific pH and temperature.
True
False
Select the incorrect statement about catalysts.
Catalysts speed up chemical reactions.
Catalysts can be enzymes, but also come in other forms.
Catalysts lower activation energy of chemical reactions.
Catalysts are used during a chemical reaction and are not recyclable.
Catalysts do what?
Speed up chemical reactions.
Slow down chemical reactions.
Creates atoms.
Reduce the number of ions in a solution.
Enzymes are a form of
catalysts.
reactants.
molecules.
proteins.
both proteins and catalysts.
Atoms are composed of
All choices are correct.
protons.
neutrons.
electrons.
What is the charge of electrons?
Negative
Positive
Neutral
Depends on the energy level the electron occupies.
The smallest particle of matter that retains the properties of calcium is a calcium
atom
molecule
macromolecule
element
True/False - Molecules have to be composed of only one type of atom.
False
True
What is all matter composed of?
atoms
cells
carbon compounds
organic material
When two hydrogen ions share their electrons with an oxygen atom, these bonds are called
covalent bonds
ionic bonds
hydrogen bonds
water bonds
When oppositely charged atoms are attracted to each other, they form
ionic bonds
covalent bonds
hydrogen bonds
unbreakable bonds
Atoms can become stable by
sharing electrons with other atoms.
destroying electrons.
becoming acidic.
becoming alkaline.
Polar molecules
have a partial positive charge on one side and a partial negative charge on the other side.
are neutrally charged across the entire atom.
mix with nonpolar molecules.
always contain calcium.
A molecule that doesn't have a negative or positive end is considered to be
nonpolar
polar
covalent
molecular
Oil and water
will not mix because water is polar and oil is nonpolar.
will not mix because water is nonpolar and oil is polar.
will mix because both oil and water are polar.
will mix because both oil and water are nonpolar.
What is the main element in biomolecules?
Carbon
Oxygen
Hydrogen
Nitrogen
Sugars are classified as
carbohydrates.
lipids.
proteins.
nucleic acids.
Which of these is an example of a carbohydrate?
polysaccharide
Ribonucleic acid
steroid
triglyceride
True/False - Starch is the compound that plants store glucose in.
True
False
Sucrose is an example of a
carbohydrate.
lipid.
nucleic acids.
steroid.
This organic compound is insoluble in water, made of fatty acids, and the main storage of energy for organisms.
Lipids
Carbohydrates
Nucleic Acids
Proteins
Amino acids are the building blocks of
proteins.
carbohydrates.
nucleic acids.
lipids.
An amino acids R Group (also called a side group)
gives the amino acid its unique properties.
can be any of 40 different functional groups.
is attached to its carboxyl group.
is found in carbohydrates.
DNA and RNA are examples of
nucleic acids.
carbohydrates.
lipids.
proteins.
Nucleotides are the building blocks of
nucleic acids.
proteins.
lipids.
carbohydrates.
Hereditary or genetic information is stored in
DNA.
RNA.
proteins.
lipids.
What holds the two strands of DNA together?
hydrogen bonds
ionic bonds
covalent bonds
peptide bonds
A sugar, a nitrogenous base, and a phosphate group is the structure of
a nucleotide.
a triglyceride.
a fatty acid.
ATP.
Enzymes acting on the reactants of a chemical reaction
reduce the activation energy.
increase the activation energy.
change the temperature of the chemical reaction.
violate the laws of nature.
A substrate is
the molecule that the the enzyme acts on.
inactive part of an enzyme.
polar part of an enzyme.
bonded to a saturated triglyceride during a chemical reaction.
True/False - An enzyme is used up in a reaction.
True
False
How many different enzymes does a cell have that assists in chemical reactions?
~20
~100
~500
~1,000
