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TEST - Ch 2 The Chemistry of Life

Total questions: 30

Worksheet time: 3hrs 30mins

Name
Class
Date
1.
What is the basic unit of matter?
a)
atoms
b)
molecules
c)
compounds
d)
none of these
2.
Which atomic particle has a positive charge?
a)
proton
b)
neutron
c)
electron
d)
valence
3.
Which atomic particle has a negative charge?
a)
proton
b)
neutron
c)
electron
d)
valence
4.
Which atomic particle has no charge?
a)
proton
b)
neutron
c)
electron
d)
valence
5.
What happens to positive and negative particles?
a)
attract
b)
repel
6.
Atoms usually have the same number of protons and electrons, therefore they are
a)
positive
b)
negative
c)
neutral
d)
none of these
7.
What is an atom that has more neutrons than protons and electrons?
a)
ion
b)
isotope
c)
valence
d)
none of these
8.
What are the valence electrons?
a)
the electrons on the innermost orbital
b)
the electrons on the outermost orbital
c)
the protons on the outermost orbital
d)
none of these
9.
How many e- must there be in the first orbital for it to be “full”, and how many e- must there be in all other orbitals for it to be “full”?
a)
2; 12
b)
2; 10
c)
2; 8
d)
8; 8
10.
What does the atomic number indicate?
a)
the mass of the atom
b)
the charge of the atom
c)
the number of neutrons
d)
the number of protons and electrons
11.
Why do atoms have to form bonds?
a)
an atom’s outer orbital is not full
b)
an atom’s inner orbital is not full
c)
they share orbitals
d)
none of these
12.

The only atoms that naturally have all orbitals full of electrons are the

a)

Elite Gasses

b)

Noble Gasses

c)

Grand Gasses

d)

None of these

13.
Which type of bond happens when atoms gain or lose electrons, become positively or negatively charged and “stick like a magnet” to other atoms?
a)
ionic bond
b)
covalent bond
c)
valence bond
d)
none of these
14.
Which type of bond happens when atoms share electrons to fill their outer orbital?
a)
ionic bond
b)
covalent bond
c)
valence bond
d)
none of these
15.

When sodium atoms (Na+) and Chlorine atoms (Cl-) bond, they form NaCl, which is a

a)

Molecule

b)

Compound

c)

Both of these

d)

None of these

16.

In a water molecule, the oxygen's eight protons attract the hydrogen's electrons. This pulls the electrons to the oxygen side of the molecule.

a)

True

b)

False

17.

Why is water considered a "polar" molecule?

a)

The oxygen atom is slightly positive and hydrogen atoms are slightly positive.

b)

The oxygen atom is slightly positive and hydrogen atoms are slightly negative.

c)

The oxygen atom is slightly negative and hydrogen atoms are slightly positive.

d)

None of these

18.

What is an attraction between atoms of same substance?

a)

Cohesion

b)

Adhesion

c)

Artesian

d)

None of these

19.
What does it mean in chemistry terms to be an organic compound?
a)
it has no carbon atoms
b)
it has two or more carbon atoms
c)
it has all carbon atoms
d)
none of these
20.
What are polymers?
a)
single, individual molecules
b)
many molecules linked together
c)
like letters in the alphabet
d)
none of these
21.
Which macromolecule is the main part of skin and muscles, is responsible for the body’s repair and defense, and is the material of enzymes?
a)
carbohydrates
b)
lipids
c)
proteins
d)
nucleic acids
22.
Which macromolecule is used for short-term energy, is a part of the structure of cells, and promotes cell recognition?
a)
carbohydrates
b)
lipids
c)
proteins
d)
nucleic acids
23.
Which macromolecule is used for long-term energy storage, cell structure and the cushioning of body organs?
a)
carbohydrates
b)
lipids
c)
proteins
d)
nucleic acids
24.
Which macromolecule carries genetic instructions and is responsible for protein synthesis (instructions for making proteins)?
a)
carbohydrates
b)
lipids
c)
proteins
d)
nucleic acids
25.
Pigments, hormones and enzymes are examples of nucleic acids.
a)
true
b)
false
26.
An enzyme is a(n)
a)
catalyst
b)
protein
c)
something that speeds up a chemical reaction
d)
all of these
27.
How does an enzyme work?
a)
It lowers the amount of energy needed to start a chemical reaction
b)
It increases the amount of energy needed to start a chemical reaction
c)
It fills the outer orbital of an atom to make a bond
d)
none of these
28.

In the enzyme diagram, which structure is the substrate?

a)

a

b)

b

29.

In the enzyme diagram, which structure is the active site?

a)

a

b)

b

30.
Enzymes are destroyed after they are used.
a)
true
b)
false

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