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Chemistry of Life

Total questions: 41

Worksheet time: 26mins

Name
Class
Date
1.
The smallest part of matter is in this picture. What is it called?
a)
Atom
b)
molecule
c)
pebble
d)
piece
2.
These things make elements
a)
Teachers
b)
Pure substance
c)
Atoms
d)
Gasses
3.
How many hydrogen atoms are in water?
a)
5
b)
1
c)
3
d)
2
4.
Which atomic particle is not found in the nucleus?
a)
proton
b)
electron
c)
neutron
d)
light
5.
Which atomic particle is involved in bonding of atoms together?
a)
neutron
b)
electron
c)
proton
d)
nucleus
6.
Atoms of the same type that have differing numbers of neutrons are called 
a)
ions
b)
bonded
c)
isotopes
d)
different elements
7.
Atoms in molecules share pairs of electrons when they make
a)
covalent bonds.
b)
ionic bonds.
c)
hydrogen bonds.
d)
polymers.
8.
The positively charged particle in an atom is called the
a)
neutron
b)
ion
c)
proton
d)
electron
9.
Which particles are found in an atom's nucleus?
a)
protons, neutrons and electrons
b)
protons and neutrons
c)
protons and electrons
d)
electrons and neutrons
10.
The chemical symbol for Oxygen is
a)
Ox
b)
Og
c)
O
d)
On
11.
The chemical symbol for Carbon is
a)
C
b)
Cb
c)
Ca
d)
Cn
12.
Two or more different different atoms combined together is a 
a)
element
b)
isotope
c)
suspension
d)
compound
13.
What contains the negative charge in a atom?
a)
Proton
b)
Electron
c)
Neutron
d)
isotope
14.
Which bonding transfers electrons
a)
Hydrogen
b)
Covalent
c)
Ionic
d)
Van der Waals
15.
If carbon contains 6 protons and 8 neutrons, it would be classified as...
a)
Carbon-15
b)
an electron
c)
a compound
d)
an isotope
16.
According to the octet rule most elements need _______ valence electrons.
a)
2
b)
8
c)
6
d)
18
17.
Which phrase best describes atoms?
a)
single-celled organism
b)
smallest basic units of matter
c)
parts of a nucleus
d)
positively charged particles
18.
An ion is formed when an atom gains or loses
a)
proton
b)
neutron
c)
quark
d)
electron
19.
Atoms connected by covalent bonds share
a)
pairs of electrons
b)
ionic compounds
c)
carbon and oxygen
d)
hydrogen ions
20.
What is a compound?
a)
two atoms of a single element bonded together
b)
atoms of different elements bonded together in certain ratios
c)
separate atoms of multiple elements in varying ratios
d)
a molecule of two oxygen atoms
21.
Hydrogen bonds can form between regions of polar molecules that are
a)
nonpolar
b)
negatively charged
c)
oppositely charged.
d)
uncharged (neutral).
22.
The attraction among molecules of different substances is called
a)
cohesion.
b)
adhesion.
c)
specific heat.
d)
surface tension.
23.
Why is water necessary to your body?
a)
It prevents large changes in blood pH.
b)
It dissolves and transports substances.
c)
It dissolves nonpolar fats and oils.
d)
It forms the solutes in blood plasma.
24.
Which of the following phrases best describes a solvent?
a)
has a high concentration of solutes
b)
can be dissolved by the solute
c)
present in a greater concentration than solutes
d)
usually a sugar or a protein
25.
A solution with a high concentration of H+ ions
a)
shows a pH of 7.
b)
kills all organisms.
c)
has a high pH.
d)
is very acidic.
26.
Carbon is unique due to the carbon atom’s
a)
bonding properties.
b)
six outer unpaired electrons
c)
ionic compounds.
d)
hydrogen bonding strength.
27.
Which category of carbon-based molecules includes sugars and starches?
a)
unsaturated fatty acids
b)
phospholipids
c)
proteins
d)
carbohydrates
28.
Fats, oils, and cholesterol are all types of
a)
cell membranes
b)
hormones.
c)
lipids
d)
fatty acids.
29.
Proteins are composed of which molecules?
a)
amino acids
b)
fatty acids
c)
monosaccharides
d)
nucleic acids
30.
DNA and RNA are two types of
a)
proteins.
b)
nucleic acids.
c)
lipids.
d)
carbohydrates.
31.

Chemical reactions change substances into different substances by

a)

conserving matter between the substances.

b)

breaking and forming chemical bonds

c)

strengthening electrical charges of substances.

d)

changing a solvent into a solute

32.

Identify the reactants in the following chemical reaction: 6H2O + 6CO2 → C6H12O6 + 6O2

a)

6H2O and 6CO2

b)

6CO2 and C6H12O6

c)

6H2O, C6H12O6, and 6O2

d)

C2H12O2 and 6O6

33.

The double arrows tell you that the following reaction CO2 + H2O (double arrows here) CO2 CO2

a)

takes place very rapidly

b)

is very unstable

c)

occurs in both directions

d)

has high bond energies

34.

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

a)

chemical energy

b)

activation energy

c)

bond energy

d)

reactant energy

35.

Which phrase best describes an exothermic chemical reaction?

a)

does not absorb any energy

b)

forms products with higher bond energy than reactants

c)

is in a state of equilibrium

d)

releases more energy than it absorbs

36.

Substances are changed into different substances when bonds break and form during

a)

chemical equilibrium

b)

chemical reactions

c)

ion formation

d)

hydrogen bonding

37.

Chemical reactions that absorb more energy than they release are called

a)

exothermic

b)

catalyzed

c)

endothermic

d)

activated

38.

Which aspect of a chemical reaction is affected by enzymes?

a)

direction

b)

rate

c)

equilibrium

d)

pH

39.

Enzymes affect chemical reactions in living organisms by

a)

changing the direction of a reaction

b)

breaking down molecules into starch

c)

increasing the temperature range

d)

weakening bonds in reactants

40.

The specific reactants that an enzyme acts on are called

a)

catalysts

b)

substrates

c)

proteins

d)

amino acids

41.

Changes in temperature and pH can decrease an enzyme’s activity by breaking

a)

hydrogen bonds

b)

amino acids

c)

peptide bonds

d)

sulfur–sulfur bonds

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