Mary J Bojan Chem 110 3 Structure of the atom Properties of the atom Atoms

# Mary j bojan chem 110 3 structure of the atom

This preview shows page 2 - 5 out of 7 pages.

Mary J. Bojan Chem 110 3 Structure of the atom Properties of the atom Atoms combine to form molecules Molecules react Energy in chemical reactions Matter & Energy Identity and structure of atom Components of atom Atomic number Average atomic mass isotopes Intro to energy Kinetic energy Potential energy Electrostatic energy Heat and work System & surroundings Exothermic & endothermic enthalpy State function light Electromagnetic spectrum Wavelength and frequency Avogadro’s number Ebook Chapter 1 Mary J. Bojan Chem 110 4
5 Lessons 01-1-3 Learning Objectives Upon completion of Lessons 01-1-3, you should be able to: Apply the technique of dimensional analysis to various chemical problems. Define the term isotope. Calculate the number of protons, neutrons, and electrons for different isotopes and ions. Calculate the average atomic mass for an element, given its isotopes and percent abundances. Using knowledge of Avogadro’s Number and the mass-mole relationship, calculate masses of individual atoms or molecules, mole quantities from mass amounts, mass quantities from mole amounts, and particle quantities from mass or mole amounts. Mary J. Bojan Chem 110 6 We will use SI (= metric) base units, derived SI units, and common prefixes See the Metric Unit Skill Check for details and practice. The common base units and important prefixes are given below. Review: Scientific Measurement: All measured quantities consist of a number and a unit. SI Base Unit Mass Kilogram (kg) Length Meter (m) Time Second (s) Temperature Kelvin (K) Important Prefixes mega- (M) 10 6 Kilo- (k) 10 3 centi- (c) 10 –2 milli- (m) 10 –3 micro- (μ) 10 –6 nano- (n) 10 –9 You must be able to fluently convert within metric units. Prefixes and conversions will not be given on an exam. Mary J. Bojan Chem 110
Review: Pure substances can be elements or compounds. Mary J. Bojan Chem 110 7 Elements : Smallest units of matter that still preserve their chemical identity. Examples: Ar (g), Fe (a metal), O 2 (g) Compounds : Substances composed of two or more elements that are chemically combined (bonded) in fixed proportions. Examples: H 2 O( ), NaCl(s) Mixture: Substances are physically present in the same place, but are not chemically bonded. They can be separated into pure substances by physical means (without changing the identity of the components).

#### You've reached the end of your free preview.

Want to read all 7 pages?

• Fall '17
• Joseph Houck
• Atom, Chem, Mary J. Bojan

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes