Welcome to Chem101 Chem 101 Chemistry and Geophysical Sciences Dept Los Angeles City College

Class Information Course CHEM 101 Location SCI 314 / 306 (lab) Instructor Terry Boan Lab Time Textbook CHEMISTRY: A Molecular Approach Nivaldo Tro,

Contact and Website Email boanta@lacitycollege.edu Website faculty.lacitycollege.edu/boanta Office Hour …TBA… Syllabus and all class info can be found on the website

Mastering Chemistry Website masteringchemistry.com Course ID You’ll find homework and quizzes here

Course Description Chemistry 101 is a 5 unit course in general college chemistry. The course combines about 3 hours of lecture with two 2 hour laboratory sessions and 2 hours of conference per week. Students should have knowledge of college algebra with a minimum grade of "C". Chemistry 101 is a college level course in general inorganic chemistry. The course is designed primarily for students who have had previous chemistry training either in high school or an elementary course at a community college. A minimum grade of "C" in this course is necessary in order to enroll in Chemistry 102.

Attendance Attendance taken daily (sign-in) & carbon copies are collected at the end of each lab period for lab attendance. Adding the class Lottery in week 2 (must attend every class) Dropping the Class Drop by ______________________to drop without “W” If you think you will not be able to complete the class, and earn a grade of “C” or higher, consider dropping the class before _________________.

Course Work A B C D F Lecture HW/Quizzes 200 Midterm (2) 300 Final Lab Formal Report 40 Labs 260 TOTAL 1000 A B C D F >88% 76% - 87% 60% – 75% 50% - 59% <50%

Academic Integrity Board Rule 9803.28 Students found cheating will receive a grade of “F” for the quiz/exam, and will be recommended to the Dean of Students for expulsion from the college.

Financial Aid If you need help paying for books and other college expenses, call the Financial Aid Office at (323) 953-4000 extension 2010, or see them at Student Services Village room 117. http://www.lacitycollege.edu/stusvcs/finaid/

Student Learning Outcome By the end of this course you will be able to solve a stoichiometry problem in which the limiting reactant is not identified in the problem. Given a stoichiometry problem in which the limiting reactant is not identified in the problem, the student will be able to correctly interpret the problem, develop a correct solution, and generate a correct answer to the correct number of significant figures. & The student will perform proper laboratory skills and techniques exhibited in first semester chemistry titration laboratory experiment, demonstrate correct analysis of data, and calculation skills.

Science and Technology Science is the process of seeking an understanding of underlying principles of nature. Science involves two facets: Technological (or factual) and philosophical (or theoretical). Technology is the direct application of knowledge to solve problems. Science grew out of natural philosophy or the philosophical speculation of nature

Science Scientific laws are descriptions of natural phenomenon. (Law of Gravity, Law of Conservation of Mass/Matter…) Many scientific laws can be stated mathematically. i.e., Boyle’s Law (PV = k)

Science A scientific theory is a set of tested hypotheses that explain natural phenomena. Scientific theories are the best current explanation for natural phenomena. Theories are always tentative and may change as observations of nature change.

Science Scientific models are tangible items or pictures used to represent invisible processes.

Limitations of Science Science is limited to studying that which is observable, and natural processes in which variables can be controlled.

Science and Technology: Risks and Benefits Science and technology are interrelated. They involve both risks and benefits. Risk-benefit analysis involves an estimation called the desirability quotient (DQ). DQ = Benefit Risks

What is Chemistry? Definition: Chemistry is the study of matter and its changes from one substance to another. Chemistry is central to all sciences and overlaps with physics, biology, geology, and astronomy. Learning about chemistry teaches you about the benefits and risks associated with chemicals and will help you to be an informed citizen and make intelligent choices concerning the world around you. Chemistry teaches you to solve problems and communicate with others in an organized and logical manner.

Biology Geology Chemistry Physics Astronomy Paleontology Medicine Biophysics Biochemistry Geochemistry Geology Chemistry Physics Physical Chemistry Chemical Engineering Nuclear Chemistry Cosmo chemistry Astrophysics Astronomy

AGRICULTURE MATERIAL COSMETICS SCIENCE ANIMAL SCIENCE ART CHEMISTRY TOXICOLOGY ENVIRONMENTAL CHEMISTRY APPLIED HEALTH TECHNOLOGY MEDICINE FIRE SCIENCE

Major Chemistry subdivisions Analytical (qualitative and quantitative) Chemistry: Qualitative Analytical Chemistry: What is a sample of matter composed of? Quantitative Analytical Chemistry: How much “stuff” is in a sample of matter? Physical Chemistry: The study of the physics involved with chemical changes. Organic Chemistry: The study of properties and reactions of compounds that contain Carbon Inorganic Chemistry: The study of properties and reactions of compounds that are not Carbon based Biochemistry: The study of living systems (Biology + Chemistry)

Major Hints in being a successful Chemistry Student Study Everyday!! A 5 unit class requires at least 10 hours/week of study time to earn a “C” Don’t fall behind – you will never catch up!!! Always ask for help when you need it – don’t wait. Working in groups is very helpful IF you have the right group!!! Read the chapter and/or online lecture notes before class to familiarize yourself with the material.

Scientific Method a test of a hypothesis or theory a tentative explanation of a single or small number of natural phenomena a general explanation of natural phenomena the careful noting and recording of natural phenomena a generally observed natural phenomenon

Standard Units of Measure

MEASUREMENTS Scientific Notation Many measurements in science involve either very large numbers or very small numbers (#). Scientific notation is one method for communicating these types of numbers with minimal writing. GENERIC FORMAT: # . # #… x 10# A negative exponent represents a number less than 1 and a positive exponent represents a number greater than 1. 6.75 x 10-3 is the same as 0.00675 6.75 x 103 is the same as 6750

MEASUREMENTS Significant Figures All nonzero numbers are significant figures. II. Zero’s follow the rules below. 1. Zero’s between numbers are significant. 30.09 has 4 SF 2. Zero’s that precede are NOT significant. 0.000034 has 2 SF 3. Zero’s at the end of decimals are significant. 0.00900 has 3 SF 4. Zero’s at the end without decimals are either. 4050 has either 4 SF or 3 SF

MEASUREMENTS Significant Figures & Calculations Significant figures are based on the tools used to make the measurement. An imprecise tool will negate the precision of the other tools used. The following rules are used when measurements are used in calculations. Adding/subtracting: The result should be rounded to the same number of decimal places as the measurement with the least decimal places. Multiplying/dividing: The result should contain the same number of significant figures as the measurement with the least significant figures.

Multiplication and Division with Significant Figures when multiplying or dividing measurements with significant figures, the result has the same number of significant figures as the measurement with the fewest number of significant figures 5.02 × 89,665 × 0.10 = 45.0118 = 45 3 sig. figs. 5 sig. figs. 2 sig. figs. 2 sig. figs. 5.892 ÷ 6.10 = 0.96590 = 0.966 4 sig. figs. 3 sig. figs. 3 sig. figs.

Addition and Subtraction with Significant Figures when adding or subtracting measurements with significant figures, the result has the same number of decimal places as the measurement with the fewest number of decimal places 5.74 + 0.823 + 2.651 = 9.214 = 9.21 2 dec. pl. 3 dec. pl. 3 dec. pl. 2 dec. pl. 4.8 - 3.965 = 0.835 = 0.8 1 dec. pl 3 dec. pl. 1 dec. pl.