Exam (elaborations)
CHEM-111G-GENERAL CHEMISTRY Exam Prep with Questions & CORRECT Verified ANSWERS
CHEM-111G-GENERAL CHEMISTRY Exam Prep with Questions & CORRECT Verified ANSWERS
[Show more]
Content preview
CHEM-111G-GENERAL CHEMISTRY Exam Prep withQuestions & CORRECT Verified ANSWERS |
rules for recording significant figures - ✔✔Non-zero digits are always significant.
All zeros between other significant digits are significant.
The number of significant figures is determined by starting with the leftmost non-zero digit. The
leftmost non-zero digit is sometimes called the most significant digit or the most significant
figure. For example, in the number 0.004205, the '4' is the most significant figure. The left-hand
'0's are not significant. The zero between the '2' and the '5' is significant.
rules for rounding significant figures - ✔✔1. If the digit to the right of the last sf is less than
5, do not change the last sf (2.532->2.53)
2. If the digit to the right of the last sf is greater than 5, round up the last sf (2.536->2.54)
(3+4-rule of 5-even)
3. If the digit to the right of the last sf are a 5 followed by a nonzero digit, round up the last sf
(2.531->2.54)
4. If the digits to the right of the last sf are a 5 followed by a 0 or no other number, look at the
last sf. If it is odd, round it up; if it is even, do not round up (2.5350->2.54 or 2.5250->2.52)
significant figures and math operation - ✔✔rules for multiple operation and division, the
results should have the same kind of sig figures as the number with the fewest amounts of sig
Rules for addition and subtraction - ✔✔the answer has the same number of decimal places
as the original number with the fewest decimal places
Atomic models in order - ✔✔Dalton's Atomic Theory In \ (1803,\) John Dalton developed a
theory of the structure of matter based on the law of chemical combination. The main
postulates of this theory are: ...
Thomson's Atomic Model J.J Thomson made the first attempt at explaining the fine structure of
the atom. ...
, Rutherford's Model of an Atom ...
According to Rutherford Model of an Atom ..
Bohr atomic model - ✔✔Atoms described as electrons orbiting the nucleus in well defined
paths.
Atomic number (Z number) - ✔✔the number of protons in an atom
mass number - ✔✔the total number of protons and neutrons in the nucleus of an atom
isotopes - ✔✔Atoms of the same element that have different numbers of neutrons
concepts definition matters - ✔✔Matter is made up of atoms
elements - ✔✔A molecule composed of one kind of atom; cannot be broken into simpler
units by chemical reactions.
Compound - ✔✔substance formed by the chemical combination of two or more elements in
definite proportions
pure substance - ✔✔A substance made of only one kind of matter and having definite
properties.
Mixtures - ✔✔A combination of two or more substances that are not chemically combined
heterogenous mixture - ✔✔A mixture with uneven distribution of different substances,
solids, liquids, gases.
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 Examsplug. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67096 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now