Welcome to CHEMISTRY !!! An Observational Science An Experimental Science A Laboratory Science An Interesting Science An Important Science A “Hard” Science.

Welcome to CHEMISTRY !!!

• An Observational Science

• An Experimental Science

• A Laboratory Science

• An Interesting Science

• An Important Science

• A “Hard” Science

What Happened To The Balloon?

• It was Whimpy and Broke!

• It was fearful of all of the people!

• Spyridis scared it!

• It got zapped by Klingons!

• Hydrogen burns!

2H2 (g) + O2 (g) 2 H2O (g) + Energy

• Hydrogen and oxygen are diatomic gases!

• Water can be a gas!• ENERGY was given off!--

This is characteristic of an Exothermic Reaction!

• This is a balanced chemical reaction!

Chemistry Homework !!!Chemistry Homework !!!

Linus Pauling - 1967

“ Chemistry is not a spectator sport,you must become involved, and thatmeans that you must do homework!”

Chemistry 142• Appendix 1 and Appendix 2• Chapter #1- Chemists and Chemistry• Chapter #2- Atoms, Molecules, and Ions• Chapter #3- Stoichiometry• Chapter #20- The Nucleus: A Chemists View• Chapter #4- Types of Chemical Reactions and

• Solution Stoichiometry• Chapter #5- Gases• Chapter #6- Chemical Equilibrium• Chapter #7- Acids and Bases• Chapter #8- Applications of Aqueous Equilibria

Figure 1.4: The various parts of the scientific method

Artist's conception of the lost Mars Climate Orbiter.

Source: NASA

The folks at JPL assumed the thrust data for the rockets given The folks at JPL assumed the thrust data for the rockets given to them by Lockeed Martin were in Metric units. They were to them by Lockeed Martin were in Metric units. They were in English units. in English units. RESULT: 125 MILLION DOLLARS RESULT: 125 MILLION DOLLARS WORTH OF SPACECRAFT BURNED UP IN THE WORTH OF SPACECRAFT BURNED UP IN THE MARTIAN ATMOSPHERE AFTER ENTERING ORBITMARTIAN ATMOSPHERE AFTER ENTERING ORBIT

#$@*&%!!!!#$@*&%!!!!

On July 23, 1983 Air Canada flight 143, a 767-200, from Montreal to Edmonton

literally ran out of fuel at 41,000 ft. Luckily, the pilot and co-pilot were able

to glide the aircraft down and land at the airport in Gimli, Manitoba. Of the

69 passengers and 8 crew on board 10 were injured during landing, but there

were no fatalities.

The ground crew loaded 22,300 lb of fuel onto the

aircraft.The flight required 22,300 kg

of fuel. 1 lb = 0.453 kg

The tanks had only 10,102 kg of fuel in them.

Units Used in Calculations

Length : A car is 12 feet long, not “12” ! A person is 6 feet tall, not “6” !

Area : A carpet measuring 3 feet(ft) by 4 ft has an area of:

( 3 x 4 )( ft x ft ) = 12 ft2

Speed and Distance : A car traveling 350 miles(mi) in 7 hours(hr) has a speed of:

350 mi / 7 hr = 50 mi / hr In 3 hours the car travels: 3 hr x 50 mi / hr = 150 mi

Derived SI UnitsQuantity Definition of Quantity SI unit

Area Length squared m2

Volume Length cubed m3

Density Mass per unit volume kg/m3

Speed Distance traveled per unit time m/s

Acceleration Speed changed per unit time m/s2

Force Mass times acceleration of object kg•m/s2 (= newton, N)Pressure Force per unit area N/(m2) (= pascal, Pa)Energy Force times distance traveled kg•m2/s2

(= joule, J)