WorksheetsChemistry in Biology Chapter Test
Total questions: 50
Worksheet time: 29mins
When placing a packet of sugar into a cup of coffee, the sugar particles that are being dissolved would be categorized as what?
solvent
colloid
suspension
solute
What distinguishes a homogeneous mixture from a heterogeneous mixture?
Homogeneous mixtures have uniform composition throughout
Homogeneous mixtures never contain water
Homogeneous mixtures have visible distinct parts.
Homogeneous mixtures have 2 or more phases
A suspension is best described as?
A permanent mixture
A type of homogeneous mixture
A type of solution
A heterogeneous mixture where particles settle over time.
What happens when an acid dissolves in water?
An acid releases hydrogen ions when dissolved in water.
On the pH Scale, a basic solution or base has which of the following?
More hydrogen ions (H+) than hydroxide ions (OH-)
What percentage of the human body is water?
25%
50%
70%
90%
Which of the following is an example of a heterogeneous mixture?
salt water
orange juice without pulp
A chunky banana and chocolate smoothie from Fosters Freeze
What type of bonds hold water molecules together?
In chemistry, a solution is defined as what?
Any mixture containing water
What type of mixture is paint classified as?
A pure substance
Colloid
Which statement about bases is correct?
Bases release hydrogen ions (H+) in water
Bases release OH- ions in water
What makes water a good solvent?
In a chemical equation, what appears to the right of the arrow?
Subscripts
Which of the following is NOT a sign that a chemical reaction has occurred?
Formation of gas
Production of heat
Change in mass
production of light
What is a chemical reaction?
A chemical reaction is a process by which atoms or groups of atoms in substances are reorganized into different substances.
According to the Law of Conservation of Mass:
Mass can be destroyed at the conclusion of a chemical reaction.
What is activation energy?
Activation energy is the minimum energy needed for reactants to form products
What occurs during an exothermic reaction?
Energy is released to the surroundings as heat or light.
What occurs during an endothermic reaction?
Energy is released into the surroundings as heat or light.
When no coefficient appears with an element in a chemical equation:
The element is not part of the reaction
The coefficient is assumed to be 1
The coefficient is assumed to be 2
The equation is unbalanced
True or False - Strong acids have weak conjugate bases.
True
False
True or False - Strong bases have a faster rate of reaction due to high amounts of H+ ions in solutions.
True
False
True or False - Both strong acids and strong bases have weak conductivity.
True
False
True or False - A similarity between strong acids and strong bases is that they both completely dissociate into ions.
True
False
Strong bases have a higher concentration of ____ ions than hydrogen ions in a solution.
H+
N+
OH-
NH-
A ______ is a substance in which other materials dissolve to form a solution.
_____ are combinations of substances that can be separated by physical means.
When iron is exposed to water vapor and air, it rusts. This ia an example of a _______________ change
Chemical
Physical
Both
_____ are heterogeneous mixtures in which particles do not dissolve and are not evenly distributed.
Pure substances
True or False - Most colloids are solids in liquids, but also can be two liquids or even a solid or liquid in a gas.
True
False
When an atom gains electrons, the atom ends up with more electrons than protons resulting in a negatively charged ion called _____.
anions
cations
neutral atoms
isotopes
When an atom loses electrons, the atom ends up with more protons than electrons resulting in a positively charged ion called _____.
cations
anions
neutral atoms
isotopes
______ states that electrons in the same sublevel occupy empty orbitals first before pairing up. Unpaired electrons must have the same spin.
Which example shows a violation of Hund's Rule?
A
B
C
D
Which of the following is written correctly?
A
B
C
D
What is incorrect about this orbital diagram?
Both arrows in the 2p box should be pointing up
There is nothing incorrect with this diagram
There should be 1 electron (arrow) in the first 2p box and one in the 2nd 2p box
All the arrows should be pointing up.
How many electrons can the p sublevel hold?
14
10
2
6
Carbon-14 has ____ protons, ____ electrons, and _____ neutrons.
6, 6, 8
6, 6, 6
6, 6, 14
6, 10, 14
An atom of phosphorus has an atomic number of 15 and a mass number of 31. How many neutrons does it contain?
15
16
31
46
By studying the picture, you can determine that Carbon-13 has ____ protons.
6
13
12
14
