WorksheetsChapter 2 Chemistry of Life
Total questions: 57
Worksheet time: 1hrs 1mins
Name
Class
Date
1.
Charge of a proton
a)
Positive
b)
Negative
c)
Neutral
2.
Charge of a neutron
a)
Positive
b)
Negative
c)
Neutral
3.
Location of the proton
a)
Nucleus
b)
Outside the nucleus
c)
Electron cloud
d)
Energy level
4.
Location of a neutron
a)
Inside the nucleus
b)
Outside the nucleus
c)
Electron Cloud
d)
Energy Level
5.
# neutrons + # protons = ___
a)
Atomic number
b)
Atomic Mass
c)
Mass Number
d)
Valence Electrons
6.
Type of bond in which electrons are shared
a)
Ionic
b)
Covalent
c)
Hydrogen
d)
Metallic
7.
Type of bond in which electrons are transferred
a)
Hydrogen
b)
Ionic
c)
Covalent
d)
Metallic
8.
Always equal to the atomic number
a)
protons
b)
electrons
c)
neutrons
9.
Changing the number of this particle would create an ion
a)
Proton
b)
Electron
c)
Neutron
10.
Changing the number of this particle would create an isotope
a)
Proton
b)
Electron
c)
Neutron
11.
Charge of an electron
a)
Positive
b)
Negative
c)
Neutral
12.
How many protons, electrons and neutrons does an neutral atom of Calcium have? Its atomic number is 20 and the mass number is 40.
a)
20 protons, 18 electrons and 40 neutrons
b)
20 protons, 20 electrons and 20 neutrons
c)
40 protons, 40 electrons and 20 neutrons
d)
20 protons, 18 electrons and 20 neutrons
13.
How many neutrons are in an atom that has an atomic number of 34, an atomic mass of 74 and a charge of -2?
a)
20
b)
40
c)
34
d)
74
14.
Which particle does not contribute mass to the atom?
a)
Proton
b)
Neutron
c)
Electron
d)
Nucleus
15.
The mass number of an element that has18 protons, 18 electrons, and 19 neutrons is _____.
a)
12.5
b)
13
c)
25
d)
37
16.
What is atomic number?
a)
Number of protons in an atoms
b)
Number of neutrons in an atom
c)
Mass of an atom
d)
Charge on an atom
17.
A water strider can skate along the top of a pond because:
a)
covalent bonds result in water cohesion
b)
hydrogen bonds result in water cohesion (surface tension)
c)
water striders have adapted to take advantage of water cohesion
d)
low surface tension of water
18.
What word describes when water is attracted to other substances?
a)
cohesion
b)
adhesion
c)
capillary action
d)
surface tension
19.
Why can water have no net charge but have slight charges in different parts of the molecule?
a)
The oxygen end is slightly negative and the hydrogen end is slightly positive
b)
The hydrogen end is slightly negative and the oxygen end is slightly positive
c)
The hydrogen and oxygen ends change in polarity
d)
Because it is hydrophobic
20.
Which is NOT a unique property of water?
a)
Frozen water floats on liquid water.
b)
Water covers most of the Earth’s surface and retains a large amount of heat.
c)
Water molecules stick to each other through hydrogen bonds.
d)
Water cools very rapidly.
21.
Water is polar because...
a)
The unequal sharing of electrons gives the water molecule a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms.
b)
The molecule has two poles, at which the it is colder than other regions of the molecule.
c)
The unequal sharing of electrons gives the water molecule a slight negative charge near its hydrogen atoms and a slight positive charge near its oxygen atom.
d)
The water molecule is neutral.
22.
tendency of molecules of the same kind to stick to one another
a)
cohesion
b)
adhesion
c)
solution
d)
polar molecule
23.
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.
24.
Water is known as the universal solvent.
a)
True
b)
False
25.
Which of the following is LEAST likely to dissolve in water?
a)
nonpolar fats and oils
b)
polar sugar molecules
c)
salt made of a positive sodium ion and a negative chloride ion
d)
all of the substances will dissolve easily in water
26.
What does the pH scale range from?
a)
0-10
b)
2-15
c)
1-5
d)
0-14
27.
what number is considered neutral on the pH scale?
a)
4
b)
12
c)
7
d)
10
28.
According to the pH range which substance is more acidic than lemon juice
a)
Hydrochloric acid
b)
cabbage
c)
milk
29.
Bleach is a strong base, what is the pH level of bleach?
a)
13
b)
14
c)
1
d)
2
30.
Which is the stronger acid?
a)
pH 1
b)
pH 4
c)
pH 8
d)
pH 5
31.
What is a solute?
a)
The substance that does the dissolving in a solution.
b)
The substance that is dissolved into the solution.
c)
The mixing of different substances.
d)
The process in which neutral molecules lose or gain electrons
32.
A solution with a pH of 3.6 would be...
a)
Acid
b)
basic
c)
Neutral
d)
Acid and basic
33.
The pH scale is based off of the concentration of _________ ions.
a)
Oxygen
b)
Hydronium (H+)
c)
Nitrogen
d)
None of the others
34.
A solution with a pH of 8.6 would be...
a)
Acid
b)
Base
c)
Neutral
d)
Acid and Base
35.
What is the activation energy?
a)
The energy of the products
b)
The energy of the reactants
c)
The minimum energy needed by the reactants to form the products.
d)
The energy lost in the reaction
36.
What is the purpose of an enzyme?
a)
give permission for the reaction
b)
raise activation energy
c)
speed up reactions
d)
control how many reactions occur
37.
Which line represents an enzyme-catalyzed reaction?
a)
Line 1
b)
Line 2
38.
Sugar water is a
a)
solution
b)
suspension
c)
colloid
39.
Italian dressing is a
a)
solution
b)
suspension
c)
colloid
40.
What type of mixture separates upon standing?
a)
Solution
b)
Alloy
c)
Colloid
d)
Suspension
41.
Particles are spread throughout a fluid but are too large to stay mixed w/o being stirred or shaken.
a)
suspension
b)
colloid
c)
solution
42.
Which solution is more concentrated?
Solution 1:
500 mL of water
100 g of salt
Solution 2:
500 mL of water
90 g of salt
a)
Solution 1
b)
Solution 2
c)
They have the same concentration
d)
I have no idea
43.
Calculate the percent solution, if there is 20 g of sugar and 50 g of water.
a)
50
b)
40
c)
20
d)
10
44.
The independent variable is the ONE thing you _____.
a)
change on purpose
b)
control or keep constant
c)
measure
45.
How many independent variables should you have in an experiment?
a)
two
b)
as many as possible
c)
four
d)
one
46.
Why do we want to test one variable at a time?
a)
Because it is hard to setup a data table with more
b)
To know what is causing the changes. This helps us understand cause and effect.
c)
It is what has always been done
47.
The variable that is being measured or observed is called the _______________. Hint: this is the variable that is the result or effect
a)
independent variable
b)
dependent variable
c)
control variable
48.
If I study for my scientific method test, then I will have a better test score. What is the dependent variable?
a)
Scientific Method
b)
Studying
c)
Independent variable
d)
Test score
49.
If I ride my bike to school instead of walking, then I will get to school faster. What is the dependent variable?
a)
True
b)
How fast you get to school
c)
Riding a bike or walking
d)
False
50.
If I put on a higher factor sunscreen, then I will burn less. What is the dependent variable?
a)
Severity of sunburn
b)
Factor of sunscreen
c)
Time spent in the sun
d)
Weather conditions
51.
What tool is used to measure liquid volume?
a)
meter stick
b)
triple beam balance
c)
LxWxH
d)
Graduated Cylinder
52.
What is the base unit for measuring mass?
a)
Meter
b)
Liter
c)
Gram
53.
Convert 27.5 cm to meters
a)
275 mm
b)
275 m
c)
.0275 m
d)
.0275 mm
54.
A meter is equal to how many centimeters?
a)
1000
b)
100
c)
10
d)
1
55.
What phrase can you use to remember the metrics system?
a)
Dear King Henry Loved Chocolate Milk
b)
Beloved King Henry Died By Chocolate
c)
King Henry Died By Drinking Chocolate Milk
d)
Queen Elizabeth Loved Chocolate Milk And Sleep
56.
Convert 3.75 kg to grams.
a)
3750 g
b)
375 g
c)
37.5 g
d)
3.750 g
57.
1000 grams = _____ kilograms
a)
0.0001
b)
1,000,000
c)
10
d)
1
100 %
