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Unit 1 Review Pt 1

Total questions: 30

Worksheet time: 18mins

Name
Class
Date
1.

Which elements are found in ALL organic molecules?

a)

Nitrogen and Oxygen

b)

Sulfur and Phosphorus

c)

Carbon and Hydrogen

d)

Carbon and Sulfur

2.

Phosphorus can be found in which of the following molecules?

a)

proteins

b)

DNA

c)

water

d)

enzymes

3.

Which element is necessary for aerobic respiration?

a)

Carbon

b)

Hydrogen

c)

Oxygen

d)

Nitrogen

4.

Name the element that is the most abundant (greatest number of atoms) in a living thing.

a)

Hydrogen

b)

Sulfur

c)

Nitrogen

d)

Phosphorus

5.

This element uses 4 covalent bonds to form long chains which is the "backbone" for ALL organic molecules.

a)

Carbon

b)

Hydrogen

c)

Oxygen

d)

Nitrogen

6.

These two elements are needed to form water, the most common molecules in living things.

a)

Carbon and Oxygen

b)

Hydrogen and Oxygen

c)

Nitrogen and Phosphorus

d)

Sulfur and Carbon

7.

This element helps to build bones and teeth. It also helps in blood clotting after injury.

a)

Calcium

b)

Zinc

c)

Sodium

d)

Iron

8.

This element is needed so that red blood cells can carry oxygen to all parts of the body.

a)

Calcium

b)

Zinc

c)

Sodium

d)

Iron

9.

What type of bond is displayed in the picture?

a)

ionic bond

b)

covalent bond

10.

What types of molecules contains both Carbon & Hydrogen and most important to living things?

a)

inorganic

b)

organic

c)

covalent

d)

ionic

11.
What word describes when water is attracted to other substances?
a)
cohesion
b)
adhesion
c)
capillary action
d)
surface tension
12.
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.
13.
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
14.
Water is a universal solvent because it...
a)
It can be found anywhere
b)
It freezes when it gets cold
c)
floats when frozen
d)
Dissolves most substances
15.
Large bodies of water, such as lakes and oceans, do not quickly fluctuate in temperature. What is the reason for this phenomenon?
a)
Water is an acid.
b)
Water is a versatile solvent.
c)
Water has a high heat capacity.
d)
 Water acts as a buffer.
16.
 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
17.
The fact that ice floats on liquid water is due to the fact that water's solid is ___________ than it's liquid form
a)
less polar
b)
more polar
c)
less dense
d)
more dense
18.
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
19.
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
20.
When water molecules stick easily to other water molecules, this is called what?
a)
cohesion
b)
adhesion
c)
solution
d)
polar molecule
21.

What property of water allows for water to act as a temperature regulator for the world?

a)

Cohesive Behavior

b)

Expansion Upon Freezing

c)

High Specific Heat

d)

Universal Solvent

22.

What property of water results in the accumulation of small amounts of water into larger amounts of water? The results in the rivers, lakes, streams, and even the oceans.

a)

Cohesive Behavior

b)

Expansion Upon Freezing

c)

Ability to Moderate Temperature

d)

Universal Solvent

23.

What property of water causes these Alka-Seltzer tablets to dissolve?

a)

Universal Solvent

b)

Expansion Upon Freezing

c)

Cohesive Behavior

d)

High Specific Heat

24.

Sweating is an example of what property of water?

a)

Ability to Moderate Temperature

b)

Expansion Upon Freezing

c)

Cohesive Behavior

d)

Universal Solvent

25.

Why does water move from the roots to the leaves of plants?

a)

Water is pushed by solutes

b)

Water is pulled by gravity

c)

Capillary action pulls the water molecules like a chain

d)

Water's cohesion causes it to "pull" towards the leaves

26.

Water has an unusually high specific heat. What does this mean?

a)

At its boiling point, water changes from liquid to vapor.

b)

A large amount of heat is required to raise the temperature of water.

c)

Ice floats in liquid water.

d)

Salt water freezes at a lower temperature than pure water.

e)

Floating ice can insulate bodies of water.

27.
Water beads up on the surface of a penny because of what property?
a)
Adhesion
b)
High Surface Tension
c)
Universal Solvent
d)
Changes in Density
28.

Water exists in a _______ state of matter between 0 and 100 degrees Celsius.

a)

solid

b)

liquid

c)

gaseous

29.

Water boils at...

a)

0 C

b)

20 C

c)

32 C

d)

100 C

30.

In a water molecule, the oxygen atom has a small...

a)

negative charge

b)

neutral charge

c)

positve charge

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