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Chem 103 Exam 1 review questions with answers- UW Madison
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Chem 103 Exam 1 review questions with answers- UW Madison
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Chem 103 Exam 1 review questions withanswers- UW Madison
What is an acid? - correct answers✔✔solution has an excess of H+ ions
What is a base? - correct answers✔✔solution has an excess of hydroxyl ions (OH-)
What is neutralization? - correct answers✔✔-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? - correct
answers✔✔water and salt ( The type of salt depends on acid or base added to
neutralize.)
What is a weak acid? - correct answers✔✔an acid that only partially ionizes in an
aqueous solution. This means that not every molecule breaks apart.
pH - correct answers✔✔is a measurement of how acidic or how basic a solution is.
Why is pH important to biology? - correct answers✔✔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? - correct answers✔✔a substance to help to neutralize/balance pH
levels.
What are pH indicators? - correct answers✔✔They are used to tell you the pH value.
Examples are phenalphelein and bromthymol blue.
,What are the properties of an acid? - correct answers✔✔taste sour, conduct
electricity, corrosive, reacts with metals, turns litmus paper red.
Give examples of acids - correct answers✔✔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? - correct answers✔✔soaps and cleaning products
used in batteries
What are some examples of bases? - correct answers✔✔lye used to make soap.
Liquid plummer used for clogged drains. Baking Soda and Baking powder
What is the main neutral substance? - correct answers✔✔water
How is a salt chemically formed? - correct answers✔✔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. -
correct answers✔✔ten (logarithmic)
What is a pH scale? - correct answers✔✔a logarithmic scale that indicates the pH of
a solution. It ranges from 0 - 14.
On the pH scale, what numbers represent an acid? - correct answers✔✔0-6
On the pH scale, what numbers represent a base? - correct answers✔✔8-14
On the pH scale, what number represents a neutral solution? - correct answers✔✔7
,What is a weak acid? - correct answers✔✔An acid that only partially ionizes (breaks
down) in a solution. Weak acids are close to 7pH
What is a weak base? - correct answers✔✔A weak base will only parttally ionize in a
solution. This means that not every molecule breaks apart.
What is a chemical change? - correct answers✔✔When a change in composition
occurs giving new substances with new properties.
Example when wood changes to carbon. Wood and carbon do not have similar
properties.
WHat is a physical change? - correct answers✔✔When a change does NOT change
the composition.
What are indicators of a chemical change? - correct answers✔✔Observations such
as what you see( color change, precipitant (solids in solutions)
Hear-boom Smell Taste-sour/sweet Feel-hot or cold.
Also, bubbles indicate gas..
What is the law of conservation of mass? - correct answers✔✔Mass is not created
nor destroyed.
What is a chemical formula? - correct answers✔✔-chemical symbols represent
molecules with subscripts to represent the number of that element.
NaCl represents table salt.
Reactants are on the right or left of the -> (yield) sign in a chemical equation. -
correct answers✔✔left
Products are on the left or right of the ->(yield) sign in a chemical equation. -
correct answers✔✔right
, What does the -> represent in a chemical equation? - correct answers✔✔yield or to
produce
What is a chemical equation? - correct answers✔✔It represents with chemical
formulas a chemical change/reaction.
When one molecule splits apart and switch places this is called a __ reaction. -
correct answers✔✔replacement type of chemical reaction
What is a reactant in a chemical equation? - correct answers✔✔They are substances
that are present before the chemical change takes place. They are what you put
into the chemical reaction to cause a chemical change.
What is a product in a chemical equation? - correct answers✔✔Chemicals that are
formed during the chemical change.
When energy is absorbed in a chemical reaction it is a __reaction. - correct
answers✔✔endothermic
When energy is released in a cheicial reaction it is a __reaction> - correct
answers✔✔exothermic ( usually in the form of heat)
What does a neutralization chemical reaction produce? - correct answers✔✔water
and salt
A chemical reaction is when a __ change has occurred. - correct answers✔✔chemical
What happens to the old molecules in a chemical reaction? - correct
answers✔✔They rearrange into new molecules
What is activation energy? - correct answers✔✔The energy needed to start a
chemical reaction.
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