Chapter 4

Objectives

• Chapter 4 – Atomic Structure
• Know your Ch. 1 - 3 Objectives.
• Know the symbols and names for the elements to be memorized.
• Know how the model of the atom has evolved since Democritus’s time.
• Be able to describe the four principles of Dalton’s Atomic Theory. Explain which of the principles still hold true today.
• Know the names of the scientists behind the discovery of each subatomic particle and be able to describe their experiments and what the results illustrated.
• Describe the evidence for the existence of electrons, protons and neutrons. Describe the properties and location with the atom of these subatomic particles.
• Be able to define isotopes, mass number and atomic number.
• Discuss atoms in terms of their numbers of electrons, protons and neutrons. Be able to write and read nuclear notation (like the charts we practiced in class).
• Recognize isotopes of an element from their nuclear notation.
• Explain the concept of weighted averages.
• Use isotopic data to calculate the atomic mass (a weighted average) of an element.
• sites:
• https://phet.colorado.edu/sims/html/isotopes-and-atomic-mass/latest/isotopes-and-atomic-mass_en.html
• http://education.jlab.org/elementflashcards/index.html

Nuclear Notation

• file:///Users/gummynichols/Downloads/NuclearNotationPractice&AnswersForWebsite.pdf

Diapositiva 3

• More FLM Practice – Rates & Density
• Gasoline is sold at a price of exactly $2.19 per gallon and your car gets 29 miles to the gallon. How many miles can you drive if you buy exactly $47 dollars of gas?
• If water flows from a faucet at a rate of 45.4 ml/sec, how many m3 of water can you collect in 30.0 minutes? 1 m3 = 1,000,000 cm3.

Diapositiva 4

• You are given 99.4 ml of gold that has a price of exactly $39.30 per gram. How many $20 gift cards can you buy with the money you raise from selling your gold? The density of gold is 19.3 g/ml. **Ignore sig figs on this problem.
• A comedian gives a 75 minute comedy show each Friday night. She tells an average of 8 jokes per minute. How many of her comedy shows do you need to watch to hear 2400 jokes? Ignore sig figs here too.