Exam (elaborations)
CHEM 120 Final Exam Review/104 Questions and Answers
- Course
- Institution
CHEM 120 Final Exam Review/104 Questions and Answers
[Show more]
Seller
Follow
Victorious23
Reviews received
Content preview
CHEM 120 Final Exam Review/104Questions and Answers
significant figures - -a digit that is either reliably known or closely estimated
-Significant Figure Rules - -1. All non-zero digits are always significant
2. Zeroes between non-zero digits are always significant
3. Zeroes to left of first non-zero digit (either before or after decimal point)
are never significant
4. Zeroes to the right of last non-zero digit
a. after decimal point are always significant
b. which are before decimal point are not significant
-conversion factor - -relationship between two quantities expressed as a
fraction
-dimensional analysis - -conversion of a measurement in one unit into
another by the use of conversion factors
-True - -T/F: number of protons never changes according to periodic table
-number of protons - -atomic number=_______________________
-number of neutrons - -mass number=_______________________
-isotopes - -atoms with same number of protons (same electron) but
different number of neutrons
-atomic mass - -weighted average of the isotopic masses of all stable
isotopes of an element
-compound - -substance composed of 2+ elements that are chemically
combined
-molecular compound - -compound in which atoms are held together by
covalent bonds
-ionic bond - -nonmetal and metal (giving away of electrons by one and
receiving by the other); electrostatic interactions between positive and
negative ions
-covalent bond - -2 nonmetals (sharing of bonds); the sharing of electrons
between two atoms
, -ion - -atom that has an electrostatic charge
-cation - -positively charged atom
-anion - -negatively charged atom
-formula unit - -simplest whole number ratio of ions in ionic compound
-polyatomic ion - -groups of covalently-bonded atoms that have an overall
charge
-physical change - -change in a substance that does not change its
composition
-extensive physical properties - -properties that depend on the amount of
matter present (ex-mass, volume)
-intensive physical properties - -properties that do not depend on the
amount of matter present (ex-color, clarity, physical state, melting/boiling
points, density)
-chemical change - -the transformation of a substance into a different
substance
(ex-rusting iron, burning coal, baking soda reacting with vinegar
-density - -the ratio of a substance's mass to its volume D=m/V
-mixture - -2 or more substances which are physically combined
-heterogeneous mixture - -non-uniform mixture containing two or more
phases with definite boundaries between them
-homogeneous mixture - -uniform mixture which contains only one phase
-solution - -another word for homogeneous mixture, but usually refers to a
liquid mixture
-compound mixtures - -The following are characteristics of:
-pure substance
-2+ elements chemically combined
-final compound does NOT have properties of original
-cannot be separated by physical methods
-homogeneous mixtures - --NOT pure substance
-2+ substances physically combined
-final mix has the properties of each of the components that make it up
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 Victorious23. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
85443 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now