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Post-Test
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1
The mass number of an atom is equal to the number of
A)protons.
B)neutrons.
C)electrons.
D)protons (ampersand) neutrons.
2
Atoms with the same number of protons and a different number of neutrons are
A)ions.
B)isotopes.
C)positively charged.
D)negatively charged.
3
An atom with 6 protons, 7 neutrons, and 6 electrons has an atomic number of
A)6
B)13
C)12
D)7
4
The chemical behavior of atoms is determined by the
A)electrons.
B)neutrons.
C)protons.
D)All of the above
5
Polar molecules are hydrophilic.
A)True
B)False
6
A substance with a pH of 10 will have more hydrogen ions than hydroxide ions.
A)True
B)False
7
A carbon atom with 4 electrons in its outer shell could accept up to 4 more electrons.
A)True
B)False
8
A crystal of table salt is held together by hydrogen bonds.
A)True
B)False
9
Non-polar substances don't dissolve in water.
A)True
B)False
10
Which of the following has the least amount of mass?
A)A proton
B)A neutron
C)An electron
D)An atom
E)A molecule
11
An atom with an incompletely filled outermost energy level is likely to be
A)unable to form bonds with other atoms.
B)reactive.
C)stable.
D)an isotope.
12
An atom with eight electrons and six protons is an example of a(n)
A)molecule.
B)mole.
C)isotope.
D)ion.
13
Ionic bonding involves
A)the sharing of electrons between two or more atoms.
B)weak bonding between adjacent water molecules.
C)the attraction of oppositely charged atoms.
D)Both 2 and 3
14
Isotopes of carbon all have the same chemical properties.
A)True
B)False
15
_______________ bonds link most of the atoms in the human body.
A)Hydrogen
B)Covalent
C)Ionic
D)All of the above
16
One pair of electrons shared between two atoms is called a(n)
A)double covalent bond.
B)single covalent bond.
C)triple covalent bond.
D)ionic bond.
17
Hydrogen bonds are too weak to form stable molecules, therefore they are not important in biological molecules.
A)True
B)False
18
Ice is less dense that liquid water.
A)True
B)False
19
_____________ allows water molecules to stick together and form droplets.
A)Cohesion
B)Adhesion
C)Surface tension
D)Capillary action
20
A substance that combines with H+ when dissolved in water is called an acid.
A)True
B)False





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