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CHEM 103 FINAL EXAM 2024/2025 QUESTIONS AND ANSWERS KEY CONCEPTS GREAT FOR REVISION
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CHEM 103 FINAL EXAM 2024/2025 QUESTIONS AND ANSWERS KEY CONCEPTS GREAT FOR REVISION
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CHEM 103 FINAL EXAMCHEM 103 FINAL EXAM 2024/2025 QUESTIONS
AND ANSWERS KEY CONCEPTS GREAT FOR
REVISION
What is an acid?
solution has an excess of H+ ions
What is a base?
solution has an excess of hydroxyl ions (OH-)
What is neutralization?
-process where acid and base are mixed until they become neutral and the PH is 7.
What are the two products of a neutralization chemical reaction?
water and salt ( The type of salt depends on acid or base added to neutralize.)
What is a weak acid?
an acid that only partially ionizes in an aqueous solution. This means that not every
molecule breaks apart.
,CHEM 103 FINAL EXAM
pH
is a measurement of how acidic or how basic a solution is.
Why is pH important to biology?
Cells survive in a specific pH range.
Human blood is maintain at 7pH for homostasis.
The stomach has acids to break down food.
Bile from the liver is a base which breaks down fats & grease.
What is a buffer?
a substance to help to neutralize/balance pH levels.
What are pH indicators?
They are used to tell you the pH value.
Examples are phenalphelein and bromthymol blue.
What are the properties of an acid?
,CHEM 103 FINAL EXAM
taste sour, conduct electricity, corrosive, reacts with metals, turns litmus paper red.
Give examples of acids
HCL which is in your stomack.
Sulfuric acid which is used a lot in industries to make fertilzers, paints, etc.
Tums antacid used to neutralize stomach acids.
What are some uses of bases?
soaps and cleaning products
used in batteries
What are some examples of bases?
lye used to make soap.
Liquid plummer used for clogged drains. Baking Soda and Baking powder
What is the main neutral substance?
water
, CHEM 103 FINAL EXAM
How is a salt chemically formed?
When you add acid or base to neutralize a solution the products formed are water
and salts.
A change in pH units represents a tenfold change in the acidity of the solution
(logarithmic scale). If one solution has a pH of 1 and a second solution has a pH of
2, the first solution is not twice as acidic a the second it is ______times more
acidic.
ten (logarithmic)
What is a pH scale?
a logarithmic scale that indicates the pH of a solution. It ranges from 0 - 14.
On the pH scale, what numbers represent an acid?
0-6
On the pH scale, what numbers represent a base?
8-14
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