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Polarity, Biochem Basics, Stats

Total questions: 30

Worksheet time: 24mins

Name
Class
Date
1.

A covalent bond with an unequal sharing of electrons is:

a)
ionic
b)
polar
c)
non-polar
d)
isometric
2.
The smallest basic unit of matter is the
a)
molecule.
b)
atom.
c)
compound.
d)
cell.
3.

Atoms in molecules share pairs of electrons when they form

a)

covalent bonds.

b)

ionic bonds.

c)

hydrogen bonds.

d)

polymers.

4.

The positively charged particle in the nucleus of an atom is called the

a)

neutron

b)

ion

c)

proton

d)

electron

5.
Which is considered neutral?
a)
pH of 4
b)
pH of 9
c)
pH of 14
d)
pH of 7
6.
Tomato juice has a pH of 4. Determine if it's an acid, base, or neutral. 
a)
acid
b)
base
c)
neutral 
7.
Household bleach has a pH of 12. Determine if it's an acid, base, or neutral.
a)
acid
b)
base
c)
neutral 
8.

Attractions between the (partial) negative Oxygen atom of one water molecule and the (partial) positive Hydrogen atom of another water molecule are called

a)
Covalent bonds
b)
Ionic bonds
c)
Polar bonds
d)
Hydrogen bonds
9.
Which end of the water molecule has a slightly positive charge?
a)
the oxygen end
b)
the hydrogen end
c)
both ends are slightly positive
d)
neither end is positive
10.
 Small insects can walk across the surface of calm water. Their feet push the surface of the water down slightly, somewhat like a person walking across a trampoline, but they do not break the surface. What is the best explanation for why this happens?
a)
The insects are light enough so that they do not break the hydrogen bonds holding the water molecules together
b)
The insects actually use their wings to hover slightly above the water's surface and they only skim it with their feet
c)
The insects' feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water's surface
d)
The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next
11.
Which statement explains why water molecules stick together?
a)
both sides are negative
b)
one side has a positive charge and the other side has a negative charge
c)
one side has a negative charge adn the other side has a neutral charge
d)
both sides are positive
12.
When a molecule has an opposite electrical charge on each end, it is known as what?
a)
cohesion
b)
polar molecule
c)
hydrogen bond
d)
solution
13.

"No Overlap" means...

a)

There is a significant difference between two groups.

b)

There is no significant difference between two groups.

14.

The variable changed in an experiment is usually on the x-axis of a graph.

a)

Independent Variable

b)

Dependent Variable

c)

Controlled Variable

d)

Null Hypothesis

15.

What is the hypothesis that states there is no significant difference between treatments, with any observed difference being due to chance?

a)

Null hypothesis

b)

Standard hypothesis

c)

Alternative hypothesis

d)

Research hypothesis

16.

Which is NOT a null hypothesis?

a)

There is no difference in intelligence of cats and dogs.

b)

Americans prefer hot dogs over hamburgers.

c)

No difference in test scores of coffee drinkers and non-drinkers.

d)

Students spend equal time on TikTok and Instagram.

17.

True or false: Oranges are more expensive than apples.

a)

True, the average price is higher.

b)

True, there is a significant difference due to overlapping error bars.

c)

False, there is no significant difference due to overlapping error bars.

18.

Which group had a decrease in reaction time after treatment?

a)

Group A

b)

Group B

c)

Group A & B

d)

Group C

19.

Is there a statistical difference between these samples?

a)

Yes, because the error bars overlap

b)

No, because the error bars overlap

c)

Yes, because the error bars don't overlap

d)

No, because the error bars don't overlap

20.

The type of variable that responds to the experiment and is what you measure or count to determine if your hypothesis is true.

a)
Independent
b)
Dependent
c)
Control
21.
An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, the independent variable is ...
a)
The type of plant
b)
The amount of sunlight
c)
The type of music
d)
The type of liquid
22.

A scientist hypothesizes that the temperature at which an alligator's egg is incubated will determine whether the alligator will be male or female. The independent variable is

a)
the male alligators
b)
the incubator
c)
the gender of the alligator
d)
the temperature
23.

This variable goes on the y-axis on a graph

a)

independent

b)

dependent

c)

constant

d)

control

24.
What word describes when water is attracted to other substances?
a)
cohesion
b)
adhesion
c)
capillary action
d)
surface tension
25.
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.
26.
A general definition of cohesion is the attraction of:
a)
particles of the same substance
b)
particles of a different substance
c)
particles of both the same and different substances
d)
particles of neither the same or different substances
27.
A high specific heat means...
a)
It heats up quickly with energy added
b)
It requires more energy to change temperature
28.

What property of water allows water to flow against gravity?

a)

Polarity

b)

Cohesion

c)

Capillary Action

d)

Adhesion

29.
How does capillary action happen?
a)
water is polar
b)
it drags other water molecules up the tubes
c)
it sticks to the tubes
d)
ALL OF THESE REASONS
30.
The tightness across the surface of water that enables paper clips to float is ____________.
a)
adhesion
b)
capillary action
c)
surface tension
d)
polarity

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