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