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BioChem Basics and Water

Total questions: 39

Worksheet time: 1hrs 8mins

Name
Class
Date
1.

An element has an atomic number of 20. This means it has:

a)

20 atoms in it.

b)

20 protons.

c)

an atomic mass of 20.

d)

20 neutrons.

2.

Protons and electrons:

a)

have the same mass

b)

are both found in the nucleus.

c)

have opposite charges.

d)

are added together to find the atomic mass.

3.

Scandium atoms have an atomic number of 21 and atomic mass of 45. What is NOT true about Scandium atoms?

a)

It has 24 neutrons.

b)

A neutral atoms has 21 protons and 21 electrons.

c)

It has 21 neutrons.

d)

It has 21 protons.

4.

What is the atomic number of the atom shown in the picture?

a)

13

b)

14

c)

1

d)

27

5.

Which statement is NOT true about atoms?

a)

Protons and neutrons are both found in the nucleus.

b)

Protons and neutrons are added together to find the atomic mass.

c)

Protons and electrons are both found in the nucleus.

d)

Atoms are identified by its number of protons.

6.

Where is the concentration of mass in an atom?

a)

The nucleus

b)

The electron cloud

7.

An atom is neutral if:

a)

it has the same number of protons and neutrons.

b)

it has the same number of protons and electrons.

c)

it has an even number of valence electrons.

d)

it has the same number of electrons and neutrons.

8.

Which of the following subatomic particles is negatively charged?

a)

neutron

b)

proton

c)

electron

d)

megatron

9.

Which particle does not have a charge?

a)

neutron

b)

proton

c)

electron

d)

megatron

10.

Which particle has a positive charge?

a)

neutron

b)

electron

c)

proton

d)

megatron

11.

An atoms nucleus has a _________ charge.

a)

positive

b)

negative

c)

neutral

d)

non

12.

An elements ________ number determines its identity.

a)

mass

b)

atomic

c)

nucleus

d)

symbol

13.
What two elements make up water?
a)
Helium and oxygen
b)
Hydrogen and oxygen
c)
helium and carbon
d)
oxygen and carbon
14.
What word describes when water is attracted to other substances?
a)
cohesion
b)
adhesion
c)
capillary action
d)
surface tension
15.
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.
16.
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
17.
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
18.
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.
19.
 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
20.
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
21.
The tightness across the surface of water that enables paper clips to float is ____________.
a)
adhesion
b)
capillary action
c)
surface tension
d)
polarity
22.
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
23.
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
24.
When water molecules stick easily to other water molecules, this is called what?
a)
cohesion
b)
adhesion
c)
solution
d)
polar molecule
25.

The ability of water molecules to stick to each other, creating surface tension is called:

a)

Cohesion

b)

Adhesion

c)

Insulation

d)

Ph

26.

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

27.

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

28.

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

29.

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

30.

Why does ice stay at the top of oceans instead of sinking to the bottom? 

a)

Ice is colder than liquid water

b)

Ice is less dense than liquid water

c)

Ice is more dense than liquid water

d)

Ice is warmer than liquid water

31.

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.

32.
Atoms are most stable when their outer shell is complete.
a)
true
b)
false
33.
How are covalent bonds formed?
a)
Sharing of electrons
b)
Transfer of electrons
34.
How are ionic bonds formed?
a)
Transfer of electrons
b)
Sharing of electrons
35.
Why do elements bond?
a)
To be friends
b)
To create a new element
c)
To become stable
36.
Is this ionic bond drawn correctly?
a)
Yes
b)
No
37.
Gain or lose electrons
a)
Ionic Bonds
b)
Covalent Bonds
c)
Both bonds
d)
Neither bond
38.
Share electrons
a)
Ionic Bonds
b)
Covalent Bonds
c)
Both bonds
d)
Neither bond
39.
This picture shows a...
a)
Ionic Bond
b)
Covalent Bond
c)
Both bonds
d)
Neither bond

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