Exam (elaborations)
Chem 103 Exam 1 review - UW Madison questions with complete solutions
- Course
- Institution
Chem 103 Exam 1 review - UW Madison questions with complete solutions
[Show more]
Seller
Follow
Content preview
Chem 103 Exam 1 review - UW Madisonquestions with complete solutions
What is an acid? - correct answer -solution has an excess of H+ ions
What is a base? - correct answer -solution has an excess of hydroxyl ions (OH-)
What is neutralization? - correct answer --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 answer -water and salt ( The
type of salt depends on acid or base added to neutralize.)
What is a weak acid? - correct answer -an acid that only partially ionizes in an aqueous solution. This
means that not every molecule breaks apart.
pH - correct answer -is a measurement of how acidic or how basic a solution is.
Why is pH important to biology? - correct answer -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 answer -a substance to help to neutralize/balance pH levels.
What are pH indicators? - correct answer -They are used to tell you the pH value.
Examples are phenalphelein and bromthymol blue.
What are the properties of an acid? - correct answer -taste sour, conduct electricity, corrosive, reacts
with metals, turns litmus paper red.
,Give examples of acids - correct answer -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 answer -soaps and cleaning products
used in batteries
What are some examples of bases? - correct answer -lye used to make soap.
Liquid plummer used for clogged drains. Baking Soda and Baking powder
What is the main neutral substance? - correct answer -water
How is a salt chemically formed? - correct answer -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 answer -ten (logarithmic)
What is a pH scale? - correct answer -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 answer -0-6
On the pH scale, what numbers represent a base? - correct answer -8-14
On the pH scale, what number represents a neutral solution? - correct answer -7
,What is a weak acid? - correct answer -An acid that only partially ionizes (breaks down) in a solution.
Weak acids are close to 7pH
What is a weak base? - correct answer -A weak base will only parttally ionize in a solution. This means
that not every molecule breaks apart.
What is a chemical change? - correct answer -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 answer -When a change does NOT change the composition.
What are indicators of a chemical change? - correct answer -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 answer -Mass is not created nor destroyed.
What is a chemical formula? - correct answer --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 answer -left
Products are on the left or right of the ->(yield) sign in a chemical equation. - correct answer -right
What does the -> represent in a chemical equation? - correct answer -yield or to produce
What is a chemical equation? - correct answer -It represents with chemical formulas a chemical
change/reaction.
, When one molecule splits apart and switch places this is called a __ reaction. - correct answer -
replacement type of chemical reaction
What is a reactant in a chemical equation? - correct answer -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 answer -Chemicals that are formed during the
chemical change.
When energy is absorbed in a chemical reaction it is a __reaction. - correct answer -endothermic
When energy is released in a cheicial reaction it is a __reaction> - correct answer -exothermic ( usually in
the form of heat)
What does a neutralization chemical reaction produce? - correct answer -water and salt
A chemical reaction is when a __ change has occurred. - correct answer -chemical
What happens to the old molecules in a chemical reaction? - correct answer -They rearrange into new
molecules
What is activation energy? - correct answer -The energy needed to start a chemical reaction.
What is a coefficient? - correct answer -The number in front of a chemical formula which tells how many
of that molecules is needed to balance the chemical equation.
Chemical reactions will produce - correct answer -new substances.
A __ represents a chemical reaction - correct answer -chemical equation
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Lectphilip. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $18.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
81989 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now