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Biology Ch 2 Chemistry of Life

Total questions: 63

Worksheet time: 43mins

Name
Class
Date
1.
What word describes when water is attracted to other substances?
a)
cohesion
b)
adhesion
c)
capillary action
d)
surface tension
2.
Attractions between the negative Oxygen atom of one water molecule and the positive Hydrogen atom of another water molecule are called
a)
Covalent bonds
b)
Ionic bonds
c)
Polar bonds
d)
Hydrogen bonds
3.
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.
4.
A molecule with electrically charged areas is called a _______________.
a)
magnet
b)
polar molecule
c)
solution
d)
electrical molecule
5.
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
6.
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.
7.

An enzyme speeds up a chemical reaction by

a)

lowering the activation energy.

b)

raising the activation energy.

c)

releasing energy.

d)

absorbing energy.

8.

An atom that has a charge is called a(n) _________.

a)

isotope

b)

molecule

c)

compound

d)

ion

9.

What is the name for a catalyst that is made by a living organism?

a)

buffer

b)

enzyme

c)

lipid

d)

nucleic acid

10.
The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?
a)
Enzymes increase the energy of the reactants.
b)
Enzymes decrease the energy level of the products.
c)
Enzyme decrease the activation energy of the reaction.
d)
Enzymes reverse the direction of the reaction.
11.
What is the smallest unit of matter that cannot be broken down by chemical means?
a)
Atom
b)
Element
c)
Ion
d)
Isotope
12.
Atoms in molecules share pairs of electrons when they make
a)
covalent bonds.
b)
ionic bonds.
c)
hydrogen bonds.
d)
polymers.
13.
Household bleach has a pH of 12. Determine if it's an acid, base, or neutral.
a)
acid
b)
base
c)
neutral 
14.
The energy needed to get a reaction started is called the
a)
reaction energy
b)
activation energy
c)
action energy
d)
red bull energy
15.
Which of the following solutions has the highest H+ ion concentration?
a)
a solution with a pH of 1
b)
a solution with a pH of 4
c)
a solution with a pH of 7
d)
a solution with a pH of 10
16.
The activation energy needed for a chemical reaction is decreased by a 
a)
catalyst
b)
reactant
c)
product
d)
substrate
17.
Which is true about a water molecule?
a)
The oxygen has a partially positive charge
b)
The hydrogen has a partially negative charge
c)
The oxygen has a partially negative charge
d)
The carbon is neutral
18.
What is happening to the energy in this reaction?
a)
Energy is absorbed
b)
Energy is released
19.
What is happening to the energy is this reaction?
a)
Energy is being absorbed
b)
Energy is being released
20.
What property of water helps to moderate earth's temperature?
a)
adhesion
b)
chohesion
c)
Specific heat capacity
d)
Latent heat of vaporization
21.

Name the 2 subatomic particles have the same mass.

a)

Protons

b)

Electrons

c)

Neutrons

22.

Which of the following in not a compound?

a)

H2O

b)

O

c)

CO2

d)

NaCl

23.

If an atom loses an electron, it will then have a ______ charge.

a)

positive

b)

negative

c)

no change

24.

If an atom gains an electron, it will then have a ______ charge.

a)

positive

b)

negative

c)

no change

25.
The chemical symbol for Oxygen is
a)
Ox
b)
Og
c)
O
d)
On
26.
The chemical symbol for Carbon is
a)
C
b)
Cb
c)
Ca
d)
Cn
27.

An ionic bond forms when

a)

One or more electrons are transferred

b)

One or more electrons are shared

c)

A proton gains a negative charge

d)

The atoms becomes exothermic and undergoes thermolysis

28.
Used to indicate acidity or alkalinity of a substance. Ranges from 0-14. Each unit has a 10 times difference in acidity or alkalinity
a)
acid scale
b)
base scale
c)
pH scale
d)
ion scale
29.
Substances that dissociate in water and release hydrogen ions (H+)
a)
bases
b)
acids
c)
compounds
d)
ions
30.
A negatively charged particle moving around the nucleus of an atom
a)
neutron
b)
proton
c)
electron 
d)
ion
31.
What determines the chemical properties of an atom?
a)
The number of protons in the nucleus
b)
Number of electrons in the outside shell
c)
The number of protons in the outside shell
d)
The number of electrons in the nucleus
32.
Attraction between slightly positive atom of one molecule to a slightly negative atom of another molecule 
a)
ionic bond
b)
hydrogen bond
c)
covalent bond
d)
van der Waals
33.
Substances formed by a chemical reaction
a)
products
b)
reactants
c)
coefficients
d)
solution
34.

Ice floats on water because

a)

of cohesion.

b)

ice has a higher density than water.

c)

water shrinks when it freezes.

d)

water expands when it freezes.

35.

When salt is dissolved in water, water is the

a)

reactant.

b)

solution.

c)

solute.

d)

solvent.

36.
Why does water move from the roots to the leaves of plants?
a)
Water is pushed by solutes.
b)
Capillary action pulls the water molecules like a chain.
c)
Water is pulled by gravity.
d)
Water’s cohesion causes it to “pull” towards the leaves.
37.

What is the smallest unit of matter that cannot be broken down by chemical means?

a)

Atom

b)

Compound

c)

Ion

d)

Isotope

38.
What are the four elements that all life is made up of?
a)
Hydrogen, Oxygen, Nitrogen and Carbon
b)
Helium, Oxygen, Neon and Carbon
c)
Hydrogen, Titanium, Carbon, Nitrogen
d)
Oxygen, Chlorine, Iron, Nitrogen
39.
What are special types of proteins that act as catalysts?
a)
Enzymes
b)
Lipids
c)
Polysaccharides
d)
DNA
40.
The mass number of an element can be easily approximated by adding together the number of ____ in an atom of that element.
a)
protons and neutrons
b)
protons and electrons
c)
isotopes
d)
ions
41.
What is the difference between covalent bonds and ionic bonds?
a)
ionic is sharing electrons; covalent is transferring electrons
b)
Covalent bonds involve the sharing of protons between atoms, and ionic bonds involve the sharing of electrons between atoms.
c)
There is a difference? 
d)
Covalent bonds involve the sharing of electrons between atoms, and ionic bonds involve the electrical attraction between atoms.
42.
Explains most specifically the attraction one water molecule to another water molecule.
a)
polar covalent
b)
hydrogen bonds
c)
ionic bonds
d)
covalent bonds
43.
What results from an unequal sharing of electrons between atoms?
a)
a nonpolar covalent bond
b)
a polar covalent bond
c)
a hydrogen bond
d)
a hydrophobic interaction
44.

The space surrounding the nucleus of an atom contains

a)

protons

b)

neutrons

c)

electrons

d)

ions

45.

If an atom contains 3 protons, 4 neutrons, and 3 electrons, its mass number would be

a)

3

b)

4

c)

7

d)

11

46.

If an atom contains 11 protons and 12 neutrons, its atomic number is

a)

1

b)

11

c)

12

d)

23

47.

Which of the following makes up a molecule of water?

a)

one atom of hydrogen and one atom of oxygen

b)

one atom of sodium and one atom of chlorine

c)

one atom of hydrogen and two atoms of oxygen

d)

two atoms of hydrogen and one atom of oxygen

48.

What type of ion forms when an atom loses electrons?

a)

neutral

b)

positive

c)

negative

d)

possible positive or negative

49.
What makes a molecule polar?
a)
Equal sharing of valence electrons
b)
Unequal sharing of valence electrons
c)
Stealing of electrons
d)
Temporary charges that come and go
50.
 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
51.
A florist places a bouquet of white carnations in water containing blue dye. After a time, the flowers turn blue. What process helped the carnations to change color?
a)
Specific heat 
b)
Surface tension
c)
Cohesion and adhesion of water molecules 
d)
Formation of covalent bonds between hydrogen and oxygen molecules
52.
 Many fish and aquatic plants can survive a cold winter because the layer of ice that forms at the top of the lake insulates the water below and prevents the lake from freezing solid. What unique property of water contributes to this effect? 
a)
Water absorbs heat when it evaporates and forms a gas 
b)
 Water expands and becomes less dense when it freezes.
c)
Water molecules completely separate into ions in solutions.
d)
 Water forms hydrogen bonds with ions and other polar substances. 
53.

Water molecules bonding to other molecules or things, such as a leaf is ___________.

a)

Adhesion

b)

Specific Heat

c)

Cohesion

d)

Expansion

54.

Which properties of water help a plant get water to the top of its leaves?

a)

Capillary Action

b)

Surface Tension

c)

Polar

d)

High Heat of Vaporization

55.

Water is very versatile in which it dissolves many substances. This is why water is called ___________.

a)

the universal solute

b)

the universal solution

c)

the universal solvent

d)

the universal dilution

56.

Organisms get their energy to do work from ___________ energy.

a)

solar energy

b)

chemical energy

c)

thermal energy

d)

nuclear energy

57.
Enzymes need to be manufactured often because they are used up in the chemical reactions they perform. (True / False) 
a)
True
b)
False
58.

Choose the element in water that has a partial positve charge

A
B
C
59.
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.
60.

When the pH decreases from 11 to 9 the hydrogen ion concentration

a)

increases

b)

decreases

c)

remains the same

61.

When the pH changes from 5 to 7

a)

hydrogen ion concentration decrease by 10

b)

hydrogen ion concentration decrease by 100

c)

hydrogen ion concentration decrease by 2

d)

hydrogen ion concentration decrease by 20

62.

When the hydrogen ion concentration decreases by a factor of 1000,

the pH changes from

a)

3 to 4

b)

3 to 5

c)

3 to 6

d)

3 to 7

63.

When the pH increases from 3 to 4 the hydrogen ion concentration

a)

increases

b)

decreases

c)

remains the same

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