Principles of ChemistryAgenda
•Review names and collect homework•Review elements•Safety Review•Class notes on Chemistry
Homework
Pass down signed safety contract!
H
hydrogen
Mg
magnesium
Li
lithium
Ca
calcium
Na
sodium
Ba
barium
K
potassium
Be
beryllium
Sr
strontium
Mg
magnesium
Li
lithium
Sr
strontium
Na
sodium
Be
beryllium
K
potassium
Ba
barium
Ca
calcium
H
hydrogen
Safety Rules Review
• Where is the fire extinguisher?• Where is the eye wash?• Where do we meet in case of a fire?• Where is the shower?• Where is the fire blanket?• Where is the phone?• Where is your nearest exit?
CHEMISTRY
Date:
Chemistry
• Definition: is the study of matter and the changes that it undergoes.
• Rewrite this definition in terms that an elementary student would understand.
What is matter?
• Provide your best definition.• Anything that has mass and takes up
space.
Mass vs. Weight
• What’s the difference?• Mass is constant. It depends on the
amount of matter present.• Weight varies depending on the pull of
gravity
Branches of Chemistry• Analytical* • Studying substance to determine what they
are made of (Laboratory work) ex. Food nutrients and quality control
• Physical • the physics behind changes of matter & the
related energy changes. ex: Reaction rates and reaction mechanisms.
• Biochemistry • the biology of matter and processes of living
organisms. ex: metabolism, fermentation
• *Inorganic • the study of the periodic table - This Class
ex: metals, metalloid and nonmetals• Organic • the study of carbon containing compounds.
ex: pharmaceuticals and plastics.
AP BIO
Select an A and B person
• Without referencing your notes, person A explain the five branches to person B. Person B check for accuracy by referencing notes.
• Switch roles
Scientific Method• Write the 6 steps to the scientific method.• Compare with others. Did you get them all?
1. State the problem2. Gather information3. Hypothesis4. Experiment5. Record and Analyze Data6. Conclusions
Hypothesis
• Define.• A tentative explanation of some regularity
of nature.
Scientific Method CONT
• A theory is a TESTED explanation of basic natural phenomena.– Watch out! Society uses “theory” as scientists
define hypothesis.• A Scientific law is a theory proven correct
and there are no exceptions.
Scientific Method CONT
• Jack-Jack Attack!
Qual vs. Quant.
• Observations made could be – qualitative – describe color, odor, shape,
etc. – quantitative – measured data:
temperature, pressure, volume, mass, length
Variables may be…
• independent – controlled variable (time, temperature) (X-axis).
• dependent – changes depending on independent variable (Y-axis).
• Need a control – a standard to compare to.