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WorksheetsReview: Basic Chemistry
Total questions: 66
Worksheet time: 39mins
Name
Class
Date
1.
What kind of ions are found in basic solutions?
a)
OH-
b)
H+
c)
H3O+
2.
Bases have a pH of ____.
a)
1-6
b)
8-14
c)
7
d)
0
3.
Acids have a pH of ___.
a)
1-6
b)
7
c)
8-14
d)
0
4.
Neutral solutions have a pH of ___.
a)
1-6
b)
7
c)
8-14
d)
0
5.
H+ ions are usually found in ____ solutions.
a)
acidic
b)
basic
c)
neutral
6.
Atoms with the same number of protons & different numbers of neutrons are known as ____.
a)
isotopes
b)
isomers
7.
Which two particles are found in the nucleus of an atom?
a)
protons & neutrons
b)
protons & electrons
c)
electrons & neutrons
8.
What kind of bonding unequally shares electrons?
a)
polar-covalent bond
b)
covalent bond
c)
ionic bond
d)
hydrogen bond
9.
Why do elements bond?
a)
to fill their outer shell
b)
they like electrons
c)
to exchange protons
10.
What kind of bonds equally share electrons?
a)
polar-covalent
b)
covalent
c)
hydrogen
d)
ionic
11.
If an atom gives away an electron, will it become positive or negative?
a)
positive
b)
negative
12.
What is the atomic mass of an element?
a)
number of protons
b)
protons + neutrons
c)
protons + electrons
d)
protons - electrons
13.
What is the atomic number of an element?
a)
number of protons
b)
protons + neutrons
c)
protons + electrons
d)
protons - electrons
14.
Where are protons located in the atom?
a)
nucleus
b)
outer energy levels
15.
Where are neutrons located in the atom?
a)
nucleus
b)
outer energy levels
16.
Where are electrons located in the atom?
a)
nucleus
b)
outer energy levels
17.
How many electrons are found in the 2nd energy level?
a)
2
b)
8
c)
16
18.
What is the smallest unit of an element that still retains its properties?
a)
atom
b)
nucleus
c)
proton
d)
electron
19.
How do you neutralize a strong acid?
a)
a strong base
b)
a weak base
c)
water
d)
a weak acid
20.
How would you neutralize a weak base?
a)
a weak acid
b)
a strong acid
c)
a strong base
d)
water
21.
Matter cannot be created or destroyed; this is the _____.
a)
Law of Conservation of Energy
b)
Law of Conservation of Mass
c)
First Law of Thermodynamics
d)
Second Law of Thermodynamics
22.
Why does an element want 8 electrons in its outer shell?
a)
to achieve stability
b)
to form a hydrogen bond
23.
What are polar covalent bonds?
a)
electrons are shared equally
b)
electrons are shared unequally
c)
electrons are transferred
24.
A charged atom that has gained or lost electrons is known as a(n) _____.
a)
ion
b)
isotope
c)
isomer
d)
neutral atom
25.
Covalent bonds have energy levels touching or overlapping.
a)
true
b)
false
26.
What causes an atom to be charged?
a)
gain or loss of electrons
b)
gain or loss of protons
c)
gain or loss of neutrons
27.
How do you calculate atomic charge?
a)
protons + neutrons
b)
protons - electrons
c)
neutrons + protons
28.
What type of bond includes the sharing of electrons?
a)
covalent
b)
ionic
c)
hydrogen
29.
Covalent compounds
a)
Share electrons
b)
transfer electrons
c)
contain a sea of electrons
d)
conduct electricity
30.
What two types of atoms make a covalent bond?
a)
2 Nonmetals
b)
1 Nonmetal and 1 Metal
c)
2 Metals
d)
2 Noble Gases
31.
How are covalent bonds explained?
a)
When one atom takes the other atom's electron
b)
When the atom shares an electron with an another atom
c)
When the two nucleus merge
d)
When the neutrons leave the nucleus
32.
How many are shared in a single bond?
a)
2 pairs
b)
4
c)
2
d)
1
33.
How are ionic bonds formed?
a)
When atoms share an electron
b)
When opposite charged atoms attract
c)
When one atom takes a proton
d)
When one atom takes a neutron
34.
Why do ionic bonds form?
a)
so the number of protons equals the number of electrons
b)
to fill the outermost energy level
c)
so an atom can become unstable
35.
Ionic Bonding involves...
a)
The transfer of protons
b)
The transfer of nuetrons
c)
The transfer of electrons
d)
None Of the above
36.
What happens when the sodium atom loses an electron?
a)
It become negatively charged
b)
It become positively charged
c)
none
37.
What is the atomic number?
a)
number of protons
b)
number of neutrons
38.
What is the mass number?
a)
the number of protons
b)
the sum of the number of protons and the number of neutrons in the nucleus of an atom
39.
an electron has this charge
a)
positive
b)
negative
c)
neutral
40.
a proton has this charge
a)
negative
b)
positive
c)
neutral
41.
atoms of the same element with different numbers of neutrons are...
a)
isotopes
b)
quarks
42.
What two elements make up water?
a)
Helium and oxygen
b)
Hydrogen and oxygen
c)
helium and carbon
d)
oxygen and carbon
43.
Attractions between water molecules are called
a)
Covalent bonds
b)
Ionic bonds
c)
Polar bonds
d)
Hydrogen bonds
44.
What is the range of pH values in an acidic solution?
a)
0-7
b)
7-14
c)
15-239058204958
d)
pH = 7
45.
Tastes bitter.
a)
Acids
b)
Bases
c)
Salts
d)
All
46.
Tastes Sour
a)
Acids
b)
Bases
c)
Salts
d)
All
47.
pH greater than 7.
a)
Acids
b)
Bases
c)
All
48.
The pH scale is based off of the concentration of _________ ions.
a)
Oxygen
b)
Hydrogen
c)
Nitrogen
d)
None of the others
49.
What is a solution that has an excess of hydroxide (OH-) ions?
a)
pH
b)
acid
c)
neutral
d)
base
50.
According to the pH range which substance is more acidic than lemon juice
a)
Hydrochloric acid
b)
cabbage
c)
milk
51.
Which are enzymes?
a)
simple carbohydrates
b)
proteins that speed up chemical reactions
c)
lipids that make up the cell membrane
d)
a building block of DNA
52.
Most enzymes:
a)
speed up the chemical reaction
b)
have no effect on the rate of the chemical reaction
c)
slow the rate of the chemical reaction
d)
keep the rate of the chemical reaction the same
53.
The part of the enzyme that the substrate bonds to is called the _____.
a)
active site
b)
activation energy
c)
bond site
d)
peptide bond
54.
Which of these do NOT affect enzyme activity?
a)
Temperature
b)
pH
c)
other Chemicals
d)
Carbohydrates
55.
If a ___ is present in a solution, it helps maintain the pH at a constant level.
a)
buffer
b)
acid
c)
base
d)
water
56.
The reactants have more energy than the products in this type of reaction
a)
Endothermic
b)
Exothermic
c)
Energetic
d)
Electric
57.
The products have more energy than the reactants in this type of reaction
a)
Endothermic
b)
Exothermic
c)
Energetic
d)
Electric
58.
The energy needed to start a reaction
a)
Activation energy
b)
Kinetic energy
c)
Atomic energy
d)
Thermal energy
59.
Enzymes ____ the amount of activation energy needed to start a reaction.
a)
Increase
b)
Decrease
60.
An atom has 4 protons, 5 neutrons, and 3 electrons. What is its atomic number?
a)
3
b)
4
c)
5
d)
+1
61.
An atom has 4 protons, 4 neutrons, and 3 electrons. What is its atomic charge?
a)
+1
b)
-1
c)
0
d)
8
62.
An atom has 3 protons, 4 neutrons, and 3 electrons. What is its mass?
a)
6 amu
b)
7 amu
c)
0
d)
-1
63.
An atom has 8 protons, 8 neutrons, and 7 electrons. It can be classified as a(n)____.
a)
Neutral atom
b)
Ion
c)
Isotope
64.
An atom has 6 protons, 6 neutrons, and 7 electrons. What is its atomic charge?
a)
12
b)
0
c)
+1
d)
-1
65.
An atom has 6 protons, 6 neutrons, and 7 electrons. What is its atomic mass?
a)
12
b)
13
c)
6
d)
0
66.
An atom has 9 protons, 8 neutrons, and 9 electrons. It can be classified as a(n)____.
a)
Isotope
b)
Ion
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