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Elements,
Atoms and Molecules
Organic Enzymes &
Compounds,
Ions
Compounds Reactions
Mixtures
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True or false? The three particles
making up all atoms are protons
with positive charge, neutrons
with no charge, and electrons
with negative charge.
True.
The nucleus of a helium atom
contains:
(a.) protons only.
(b.) protons and neutrons.
(c.) protons and electrons.
(d.) electrons only.
(b.) protons and neutrons
How does one calculate the mass
of an atom?
Add together the number of
neutrons and protons in the
nucleus.
A sodium ion has 21 protons and
20 electrons. What kind of
electrical charge does it have?
positive charge
The atomic number of oxygen is
eight. What does this tell us
about an oxygen atom?
Every oxygen atom has 8 protons
in its nucleus.
True or false? A methane
molecule contains one carbon
atom and two hydrogen atoms.
False. A methane molecule
contains one carbon atom and
four hydrogen atoms
A covalent bond is a link between
two ...?… sharing a pair of …?…
(a.) atoms……protons.
(b.) ions ……. electrons.
(c.) ions ……. neutrons.
(d.) atoms ….. electrons.
(d.) atoms ………electrons.
What is a molecule?
A particle containing two or more
atoms connected by covalent
bonds.
Draw a diagram showing the
number, kinds, and arrangement
of atoms in a carbon dioxide
molecule.
O C O
Explain what it means to say that
a water molecule is polar.
A water molecule has a partially
positive region around the
hydrogen atoms and a partially
negavite region around the
oxygen atom.
True or false? All the atoms
making up an element are alike.
True.
Properly match the examples in
the first row with the categories in
the second row.
EXAMPLES
• air
• aluminum
• water
CATEGORIES
• element
• compound
• mixture
Air is a mixture.
Aluminum is an element.
Water is a compound.
What do we call a substance
containing two or more elements
chemically combined?
compound
What is the pH range for (a.) an
acid, (b.) a base, and (c.) a neutral
solution?
Acids range from 0-7, bases
range from 7-14, and neutral
solutions are close to 7.
Define and give an example of a
solution.
A solution is a mixture in which
the molecules of one substance
are equally distributed among the
molecules of another substance.
Examples include salt water or
sugar water.
True or false? All compounds
containing carbon are organic
compounds.
False. Compounds like carbon
dioxide, marble, and baking soda
with carbon covalently bonded to
oxygen are inorganic and do not
turn black when heated.
Which of the following types of
organic molecules are made by
linking together amino acids?
(a.) carbohydrates
(b.) lipids
(c.) proteins
(d.) nucleic acids
(c.) proteins
What three elements make up
carbohydrates, and in what
proportions?
1 part carbon
2 parts hydrogen
1 part oxygen
What are the building block
molecules of DNA and RNA?
nucleotides
What is one difference between
saturated and unsaturated fats?
Saturated fats have no C=C
bonds and are solid at room
temperature. Unsaturated fats
have C=C bonds are are liquid at
room temperature.
True or false? Most enzymes are
proteins.
True.
Chemical reactions convert:
(a.) reactants into products.
(b.) catalysts into enzymes.
(c.) substrates into active sites.
(d.) products into reactants.
(a.) reactants into products.
The energy needed to start a
chemical reaction is called what?
activation energy
What is the function of enzymes
in organisms?
Enzymes speed up chemical
reactions necessary for life.
Energy cannot be created or
destroyed. Where does the
energy come from to produce the
heat when methane burns?
When the carbon-hydrogen bonds
of methane break, chemical energy
in the C-H bonds is converted into
heat energy.
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Period: 4 Date: Jan. 02, 2007
PROKARYOTES
EUKARYOTES
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