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WorksheetsBiochem Review
Total questions: 35
Worksheet time: 45mins
Name
Class
Date
1.
Electrons have a charge of:
a)
-1
b)
-2
c)
+1
d)
+2
2.
What's a valence electron?
a)
electrons in the second energy level
b)
electrons in the outermost energy level
c)
the atomic number
d)
electrons in the first level
3.
What's an octet?
a)
a set of 8
b)
a set of 7
c)
4 electrons
d)
group 8A
4.
How many energy shells does Aluminum (Al) have?
a)
2
b)
3
c)
4
d)
1
5.
Because it is already in the most stable form with a full valence shell, which element will not form bonds?
a)
Mercury
b)
Carbon
c)
Hydrogen
d)
Krypton
6.
How many valence electrons make the atom "happy"?
a)
2
b)
6
c)
8
d)
45
7.
The first electron shell is an exception because it is full when you have ____ electrons
a)
4
b)
1
c)
10
d)
2
8.
How many valence electrons does Magnesium (Mg) have?
a)
1
b)
2
c)
12
d)
24
9.
Type of bond in which electrons are shared
a)
Ionic
b)
Covalent
c)
Hydrogen
d)
Metallic
10.
Type of bond in which electrons are transferred/stolen
a)
Hydrogen
b)
Ionic
c)
Covalent
d)
Metallic
11.
Always equal to the atomic number
a)
protons
b)
electrons
c)
neutrons
12.
How many protons does an Aluminum atom have? (use the picture to help you)
a)
27
b)
13
c)
14
d)
40
13.
How many neutrons does the average sodium atom (Na-23) have?
a)
23
b)
11
c)
12
d)
34
14.
How many electrons does this CA-20 have?
a)
40
b)
21
c)
20
d)
41
15.
What type of molecule is water?
a)
Polar
b)
Non-polar
c)
Polar and non-polar
d)
compound
16.
What do polar molecules attract to?
a)
Non-polar molecules
b)
Everything
c)
Other polar molecules
17.
What is refers to the binding together of 2 substances of the same type?
a)
Solvent
b)
Solute
c)
Cohesion
d)
Adhesion
18.
Water's temperature usually remains, _____________?
a)
Stable
b)
Unstable
c)
cold
d)
hot
19.
What are hydrogen bonds made up of?
a)
Positive hydrogen atoms and negative oxygen atoms
b)
Negative hydrogen atoms and positive oxygen atoms
c)
H2
20.
Why can polar molecules attract each other?
a)
Because they are polar
b)
Because they are partly positive and partly negative
c)
Because of ionic bonds
d)
adhesion
21.
What is solvent?
a)
Dissolves the solute
b)
The substance being dissolved
c)
All of the above
22.
An attraction between molecules of different substances.
a)
Non-polar
b)
Polar
c)
Cohesion
d)
Adhesion
23.
Why can some lizards run on water
a)
Because of Adhesion
b)
Because of cohesion
c)
Because they're too cool for land
d)
Because they're really fast
24.
Which has the greater EN:
Cl or Al?
Cl or Al?
a)
Cl
b)
Al
c)
same
25.
What kind of bond do you have: B and C
a)
Non-polar covalent
b)
Polar covalent
c)
ionic
d)
James Bond
26.
What kind of bond do you have: Be and Cl
a)
Non-polar covalent
b)
Polar covalent
c)
ionic
d)
James Bond
27.
What kind of bond do you have: K and Br
a)
Non-polar covalent
b)
Polar covalent
c)
ionic
d)
James Bond
28.
What kind of bond do you have: H and H
a)
Non-polar covalent
b)
Polar covalent
c)
ionic
d)
James Bond
29.
Attractions between water molecules are called
a)
Covalent bonds
b)
Ionic bonds
c)
Polar bonds
d)
Hydrogen bonds
30.
Why does ice float?
a)
As water freezes, it expands and its density decreases.
b)
As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
c)
As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
d)
As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.
31.
Which types of compounds dissolve easily in water?
a)
Nonpolar
b)
Polar
c)
Ionic
d)
All covalent
32.
Water droplets take a spherical shape (as pictured) because of ____________
a)
adhesion
b)
cohesion
c)
capillary action
d)
solubility
33.
What is the reason why oil and water don't mix?
a)
Oil is too heavy to mix with water
b)
Water can only mix with polar molecules
c)
Water can only mix with non-polar molecules
d)
Oil is too light to mix with water
34.
Elements that tend to gain electrons for stability have the largest -
a)
atomic radius only
b)
ionization energy only
c)
ionization energy and electronegativity
d)
atomic radius and electronegativity
35.
The measure of how strongly atom hold onto their electrons is
a)
Electronegativity
b)
ionization energy only
c)
ionization energy and electronegativity
d)
atomic radius and electronegativity
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