Help students develop the skill of critical thinking

Help students develop the skill of critical thinking.

CRITICAL thinking is the process of analyzing and applying what you already know as a guide to action.

Critical thinking attempts to intellectually figure something out.

Running out of time!

r o f h c r a a se

Spark Please read the scientific data handout and answer the questions that follow.

The Picture of Good Health! Cat Beverage

Read the TV article Highlight/underline any words that you don’t know and can’t figure out using the context. Describe the experimental design… What is the main idea of the article? What evidence supports the main idea? Identify the kind of data used in the research. Do you agree with the author’s conclusion about the research?

Freakonomics Which are more dangerous for kids, swimming pools or gun? Does a child’s name affect how successful they will be as adults? Do the police really lower crime rates? Does the death penalty lower the murder rate? Do parents matter?

Which of the following variables influences a child’s school performance? ECLS, 1998, K-5 Parent education Intact family High parental SES Many books at home Low birthweight Head Start English at home Parents read daily Recent move to a better neighborhood Spanked Mother was 30+ at time of first child Adoption Mother did not work between birth and Kindergarten Museums Lots of TV PTA

Communication Everything a scientist writes is an argument… Scientists want to convince people of their ideas based on evidence! ? ? ? ? ? ? There are many ways to communicate in science! Memos, emails, blogs, paragraphs, essays, research articles/reports, books

Spark Find your new seat, then… Please read the first nine chemistry subdisciplines handout, develop questions, and consider which sub-discipline you feel is most interesting or most important.

The study of the properties of materials and the changes that materials undergo.

You know the active ingredient in beer is C 2 H 5 OH.

Instead of saying ozone, you say O 3.

You refer to the smell of nail polish remover as an acetone smell.

You ask for acetaminophen instead of Tylenol.

Even Better: You ask for acetylsalicylic acid Instead of aspirin

You know the hazards of mixing trinitrotoluene and tetrahydrocannabinol

That’s TNT (dynamite) and THC (marijuana)

When you hear the word MOLE, you think of the 23 number 6. 02 X 10 instead of a small furry animal.

You wash your hands BEFORE you go to the bathroom.

What's wrong with this picture?

Safety glasses should ALWAYS be worn during a lab.

NO! NO! Long hair should be tied back.

Lab Safety

NO! NO! Bulky and loose clothing Are dangerous in the lab.

Flammable materials must be kept away from lab burners.

Don’t let this happen to you!

Problem Based Learning A critical thinking task • Always ask, “What is the quality of the evidence supporting the claim? ” • Good Science vs Bad Science vs Pseudoscience • Health care is a multi-billion dollar industry full of deception and fraud • Alternative therapies: homeopathy, iridology, therapeutic touch, reflexology, acupuncture and acupressure

PBL Groups Decide whether or not the claim in the report is justified by the evidence cited in the report.

PBL Groups The 11 November 1998 issue of the American Medical Association reportes that a Chinese remedy used on pregnant women improves the position of the fetus for an easier birth. The treatment reduces the risk of breech (rump-first) births.

PBL Groups The treatment involved heating an acupuncture point upon the smallest toe (“moxibustion”). Two hundred and sixty women with poorly positioned fetuses were studied. Half of the women were randomly selected to receive moxibustion. The other women (controls) received no treatment. The investigators found that the untreated women had significantly more breech births. The authors stated that previously no randomized controlled trial, like this one, had ever been conducted

Horse-play has no place in the lab. If it occurs, those involved will be disqualified from the lab, given a referral, and given a ZERO for the assignment.

Horse-play has no place in the lab. You probably would not intentionally harm someone, BUT accidents can happen.

Lack of pre-lab preparation is the main threat to safety in our lab.

Lack of pre-lab preparation If you are unprepared, you will be unsure of what to do, waste time, and have a good chance of making a mistake that leads to a problem.

At the beginning of each lab Pay close attention to verbal instructions given at this time.

At the beginning of each lab You will be given a chance to ask questions before we begin.

At the beginning of each lab THIS is the time to ask. . . NOT after the lab starts.

Once the lab starts, you and your group are on your own.

I will get involved only with issues of SAFETY…

and that will cost your group 10 POINTS.

Water and acid combine in an EXOTHERMIC reaction.

Water and acid combine in an EXOTHERMIC reaction.

Water and acid combine in an EXOTHERMIC reaction.

Hazard Identification Label

Lab Equipment

Lab Equipment ? ?

Lab Equipment Erlenmeyer flask

Lab Equipment Erlenmeyer flask ? ?

Lab Equipment Erlenmeyer flask Beaker

Lab Equipment Erlenmeyer flask Beaker ? ?

Lab Equipment Erlenmeyer flask Beaker Test tube

Lab Equipment Graduated Cylinder Read the bottom of the meniscus.

Lab Equipment Read the bottom of the meniscus. ? ?

Lab Equipment Read the bottom of the meniscus. Volumetric Flask

Lab Equipment ? ?

Lab Equipment Volumetric Pipet

Lab Equipment Volumetric Pipet ? ?

Lab Equipment Volumetric Pipet Dropper Pipet

Lab Equipment Volumetric Pipet ? ? Dropper Pipet

Lab Equipment Mohr Pipet Volumetric Pipet Dropper Pipet

Lab Equipment Draw liquid into the pipet with the bulb, NEVER by mouth like a straw.

Lab Equipment Quickly remove the standard bulb and place your finger over the top to hold in the liquid.

Lab Equipment Roll your finger SLOWLY to allow liquid to flow from the pipet. This takes practice!

Lab Equipment Do not remove the liquid remaining in the tip. MOST pipets are calibrated to retain this amount.

Lab Equipment Professional labs today use "automatic" pipets with disposable tips.

Lab Equipment A buret is a uniform cylinder designed to accurately measure a volume of liquid transferred to another vessel.

Lab Equipment ? ?

Lab Equipment Evaporating Dish

Lab Equipment Evaporating Dish ? ?

Lab Equipment Evaporating Dish Watch Glass

Lab Equipment Evaporating Dish Watch Glass ? ?

Lab Equipment Evaporating Dish Watch Glass Crucible and Cover

Lab Equipment Evaporating Dish Watch Glass Crucible and Cover ? ?

Lab Equipment Evaporating Dish Watch Glass Crucible and Cover Glass Stirring Rod

Lab Equipment ? ?

Lab Equipment Support Ring

Lab Equipment Support Ring ? ?

Lab Equipment Support Ring Utility Clamp

Lab Equipment Support Ring Utility Clamp ? ?

Lab Equipment Support Ring Utility Clamp Wire Gauze

Lab Equipment ? ?

Lab Equipment Wire Triangle

Lab Equipment Wire Triangle ? ?

Lab Equipment Wire Triangle Lab Burner

Lab Equipment Wire Triangle Lab Burner ? ?

Lab Equipment Wire Triangle Lab Burner Ring Stand

Lab Equipment ? ?

Lab Equipment Crucible Tongs ? ?

Lab Equipment Crucible Tongs Test tube Holder

Lab Equipment Crucible Tongs Test tube Holder

Lab Equipment Crucible Tongs Test tube Holder

Lab Equipment ? ?

Lab Equipment Thermometer

Lab Equipment Thermometer ? ?

Lab Equipment Thermometer Wash Bottle

Lab Equipment Thermometer Wash Bottle ? ?

Lab Equipment Thermometer Wash Bottle Chemical Spoon or Spatula

Lab Equipment ? ?

Lab Equipment 1 Filter paper 3 open edges on one side, 1 open edge on the other.

Lab Equipment 1 Filter paper Fold filter paper in half - twice to make a cone for the funnel. Filter Funnel 3 open edges on one side, 1 open edge on the other.

Lab Equipment Support the funnel with a ring stand. NEVER allow the sample to go over the top of the filter paper.

Lab Equipment Electronic Balance Triple-beam Balance NEVER place chemicals directly on the balance pan!

Attach the burner hose to the nozzle and turn on the gas at the wall FIRST. The gas is fully on when the handle is PARALLEL with the nozzle.

Attach the burner hose to the nozzle and turn on the gas at the wall FIRST. Always use the burner with the nozzle in this position.

Attach the burner hose to the nozzle and turn on the gas at the wall FIRST. Move the handle all the way in either direction to turn it off.

Clean-up is important for the safety of those that come after you AND for the preservation of lab equipment.

Clean-up will vary from lab to lab. Instructions will be given for appropriate clean-up for each lab.

NEVER put broken glass in the trash can.

Some chemicals can be put down the drain - with LOTS of running water. . .

Other chemicals must be put in a waste container AS DIRECTED.

NEVER put un-used chemicals back into their original container.

Hazard Identification Label

ALWAYS read the labels on containers.

National Fire Protection Association

OSHA Approved Signs Major safety hazard Possible hazard A hazard to safety Safety information

MSDS Material Safety Data Sheet

Provides all relevant safety information about a chemical

Pre-lab Group Activity Calibrate your balance with a mass of known value (located by the other balances on the countertop the calibration knob is located on the left side of the triple beam balance). Separating a Mixture

Chemistry is NOT a math class, but you will need your OWN scientific calculator.

Intensive properties - such as temperature, melting point, and density - do not depend on the amount of the sample being examined. Extensive properties - such as mass and volume - depend on the quantity of the sample. Quantitative properties - such as mass, volume, and melting point - are associated with numbers. Qualitative properties - such as color, odor, and texture - have no association with numbers.

Changes in Matter • During a physical change, a substance changes its physical appearance, but NOT its composition. All changes of state are physical changes. • During a chemical change, a substance becomes a chemically different substance. All chemical reactions are chemical changes.