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Essentials Of Biology Ch. 2--Part 1
Test Description: Part 1 of 2
Instructions: Answer all questions to get your test result.
1) ______ is an example of an element.
A
Water
B
Glucose
C
Salt
D
Carbon
2) The four most common elements found in living things are
A
oxygen, calcium, hydrogen, and carbon.
B
carbon, oxygen, potassium, and calcium.
C
carbon, oxygen, nitrogen, and hydrogen.
D
nitrogen, oxygen, phosphorus, and carbon.
3) Which of the following elements, essential to life, is a trace element?
A
iodine
B
calcium
C
phosphorus
D
carbon
4) An atom with a positive charge has ______.
A
more protons than electrons
B
more electrons than protons
C
more protons than neutrons
D
more neutrons than protons
5) All atoms of an element have the same number of ______.
A
electrons
B
protons plus neutrons
C
protons
D
neutrons
6) An atom's ______ are found in its nucleus.
A
protons only
B
neutrons and electrons
C
protons and neutrons
D
electrons, protons, and neutrons
7) Beryllium's atomic mass is 9 and its atomic number is 4. How many neutrons are found in a beryllium atom?
A
13
B
4
C
9
D
5
8) The way Earth moves about the sun is most like ______.
A
a neutron moving about a proton
B
a neutron and electron moving around a proton
C
a proton moving about an electron
D
an electron moving around the nucleus of an atom
9) Isotopes of an element have the same number of ______ and different numbers of ______.
A
neutrons... protons
B
protons... neutrons
C
electrons... protons
D
protons... electrons
10) How do radioactive isotopes differ from isotopes?
A
Radioactive isotopes have more neutrons than do isotopes.
B
Radioactive isotopes are unstable; isotopes are stable.
C
Radioactive isotopes are stable; isotopes are unstable.
D
Radioactive isotopes have fewer neutrons than do isotopes.
11) The second electron shell of an atom can hold a maximum of ______ electron(s).
A
2
B
1
C
6
D
8
12) Nitrogen has an atomic number of 7; therefore, it has ______ electrons in its outermost electron shell.
A
18
B
5
C
2
D
10
13) An atom with an electrical charge is a(n) ______.
A
molecule
B
compound
C
isotope
D
ion
14) The bond between oppositely charged ions is a(n) ______ bond.
A
hydrogen
B
covalent
C
polar
D
ionic
15) What name is given to bonds that involve the sharing of electrons?
A
covalent
B
polar
C
hydrogen
D
ionic
16) Why is water considered a polar molecule?
A
The oxygen end of the molecule has a slight negative charge, and the hydrogen end has a slight positive charge.
B
Both hydrogens are at one end of the molecule, and oxygen is at the other end.
C
The oxygen is found between the two hydrogens.
D
The oxygen atom attracts the hydrogen atoms.
17) The hydrogen atoms and oxygen atom of a water molecule are held together by ______ bonds.
A
covalent
B
osmotic
C
hydrogen
D
electron
18) Adjacent water molecules are joined by ______ bonds.
A
covalent only
B
ionic
C
polar and covalent
D
hydrogen
*select an answer for all questions
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