Principles of Chemistry Agenda Review names and collect homework Review elements Safety Review...

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.