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Chapter 2 - Chemistry of Life

Total questions: 50

Worksheet time: 36mins

Name
Class
Date
1.
Substances that dissociate in water and release hydrogen ions (H+)
a)
bases
b)
acids
c)
compounds
d)
ions
2.
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
3.
A negatively charged particle moving around the nucleus of an atom
a)
neutron
b)
proton
c)
electron 
d)
ion
4.
An atom becomes negatively charged by
a)
gaining an electron
b)
losing an electron
c)

losing a proton

d)

gaining a neutron

5.
Atoms having the same number of protons but different numbers of neutrons
a)
molecule
b)
atom
c)
compound
d)
isotopes
6.
Two or more different atoms combined
a)
Molecule
b)
Compound
c)
Isotope
d)
Ion
7.
Bond created by the sharing of electrons
a)
Ionic Bond
b)
Hydrogen Bond
c)
Covalent Bond
d)
van der Waals
8.
A charged atoms (caused by gain or loss of electrons)
a)
Ion
b)
molecule
c)
element
d)
compound
9.
Attractions between molecules of the same substance
a)
adhesion
b)
cohesion
c)
mixture
d)
acid
10.
Who am I? I'm a polymer composed of amino acids that are linked by peptide bonds. Amino acid bonds determine my folds. 
a)
Lipid
b)
Carbohydrate
c)
Protein
d)
Sugar
11.

What makes carbon so important to life?

a)

bonding properties

b)

its place on the Periodic Table

c)

it is a reactant in all chemical reactions

d)

it is an enzyme

12.

What makes a chemical reaction?

a)

matter is conserved

b)

breaking and forming of chemical bonds

c)

when products form reactants

d)

when you do a lab

13.

What are the smallest basic units of matter?

a)

molecules

b)

atoms

c)

elements

d)

7th graders

14.

Exothermic reactions

a)

absorb more energy than they release

b)

are cold

c)

do not use bond energy for activation

d)

release more energy than they absorb

15.

Which of the following solutions has the highest Hydrogen 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.

A catalyzed reaction

a)

increases the products made

b)

uses less activation energy to get started

c)

has a slower reaction rate

d)

uses more reactants throughout the reaction

17.

Enzymes act on

a)

products

b)

proteins

c)

amino acids

d)

substrates

18.

Activation energy

a)

is the term for the amount of energy in each reactant

b)

helps the enzyme to increase the rate of the reaction

c)

is the term for the amount of energy that needs to be added for a chemical reaction to start

d)

is the term for the amount of energy released by the reaction after it starts

19.

What are the 4 types of carbon-based macromolecules in organisms?

a)

carbohydrates, lipids, fatty acids, and monomers

b)

polymers, monomers, acids, bases

c)

adhesion, cohesion, evaporative cooling, and high specific heat

d)

nucleic acids, proteins, lipids, and carbohydrates

20.

What are proteins made of?

a)

amino acids

b)

monosaccharides

c)

nucleic acids

d)

fatty acids

21.

Which carbon-based molecule includes sugar and starches?

a)

carbohydrates

b)

lipids

c)

proteins

d)

nucleic acids

22.

What is the primary function of DNA?

a)

to make nucleic acids

b)

long term energy storage

c)

store genetic information

d)

to function as RNA

23.

What is happening in this picture?

a)

an enzyme is binding a substrate together to form a product

b)

an enzyme is breaking down a substrate to release new products

c)

the active site of the enzyme does not fit the substrate

d)

a change in pH has damaged the enzyme

24.

Changes in the pH, temperature, enzyme concentration, and/or substrate concentration can negatively affect

a)

the activation energy of chemical reactions

b)

the bond energy released by reactants in a reaction

c)

the efficient function of an enzyme or catalyzed reaction

d)

the polarity of water used for evaporative cooling

25.
Plants store glucose in the form of
a)
starch
b)
glycogen
c)
cellulose
d)
chitin
26.
Which type of carbohydrate is this?
a)
monosaccharide
b)
disaccharide
c)
polysaccharide
d)
glyceride
27.
All compounds that end in ASE are..
a)
Sugars
b)
Enzymes
c)
DNA
d)
Fats
28.
What is structure A?
a)
Substrate
b)
Active site
c)
Enzyme
d)
Products
29.
What is structure D?
a)
Substrate
b)
Active site
c)
Enzyme
d)
Products
30.
What is a substance called if it speeds up a chemical reaction?
a)
reusable
b)
catalyst
c)
specific
d)
fragile
31.
What property of water helps to moderate earth's temperature?
a)
adhesion
b)
chohesion
c)
Specific heat capacity
d)
Latent heat of vaporization
32.
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.
33.

The nucleus is made up of

a)

protons and electrons

b)

protons, neutrons, and electrons

c)

neutrons

d)

protons and neutrons

34.

A solution is a(n)

a)

breaking of a chemical bond

b)

chemical reaction

c)

evenly distributed mixture of two or more substances

d)

combination of two or more liquids

35.

atomic number

a)

number of protons

b)

number of neutrons

c)

number of electrons

d)

number of protons and neutrons

36.

mass number

a)

number of protons

b)

number of electrons

c)

number of protons and electrons

d)

number of protons and neutrons

37.
Made of monomers of monosaccharides
a)
Carbohydrates
b)
Lipids
c)
Proteins
d)
Nucleic Acids
38.
Once a new product leaves an enzyme, the enzyme is unchanged and ready for the next substrate.  True or False
a)
True
b)
False
39.
The electrons involved in chemical bonds are called ___________ electrons.
a)
valence
b)
ionic
c)
Van Der Waals
d)
covalent
40.
What word describes when water is attracted to other substances?
a)
cohesion
b)
adhesion
c)
capillary action
d)
surface tension
41.
molecule in which opposite ends have opposite electric charges
a)
cohesion
b)
polar molecule
c)
hydrogen bond
d)
solution
42.
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
43.
Water striders can walk across the surface of calm water. Their feet push the surface of the water down slightly, but they do not break the surface. Why?
a)
The insects are light enough so 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 insect’s 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
44.
Which major macromolecule is being represented in this image? 
a)
carbohydrate
b)
lipid
c)
protein
d)
nucleic acid
45.
What type of macromolecule is being represented in this image? 
a)
carbohydrate
b)
lipid
c)
protein
d)
nucleic acid
46.

Many monomers bonded together form a:

a)

Multimer

b)

Polygon

c)

Polymer

d)

Manymer

47.

A single unit that can bond to other single units to form a polymer is a:

a)

Lego

b)

Monounits

c)

Monopoly

d)

Monomer

48.

large macromolecule formed from monosaccharides

a)

polymer

b)

monomer

c)

polysaccharide

d)

amino acid

49.
How are ionic bonds formed?
a)
Transfer of electrons
b)
Sharing of electrons
50.
Atoms are most stable when their outer shell is complete.
a)

True

b)

False

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