Safety

• Wear closed shoes that cover foot.

• Do not prop door open, must remain closed.

• NO FOOD OR DRINK in the lab.

• No children in the lab.

Lab equipment:

1.

2.

3.4.

5.

6.

7.

Images from Jeff Beck http://iws.ccccd.edu/jbeck/Measurementweb/Page.html

Unit 1 Measurement

Pages 11-27

Metric System

• Basic units– Length-meter– Mass-gram– Volume- liter

• Based on ten

• Prefixes used to modify the base

Metric Prefixes

• Kilo (k)– 1000 X base unit (103 X base unit)

• Hecto (h)– 100 X base unit (102 X base unit)

• Deka (da)– 10 X base unit (101 X base unit)

Metric prefixes

• Deci (d)– 1/10 X base unit (10-1 X base unit)

• Centi (c)– 1/100 X base unit (10-2 X base unit)

• Milli (m)– 1/1000 X base unit (10-3 X base unit)

Less commonly used prefixes

• Tera 1012

• Giga 109

• Mega 106

• Micro 10-6

• Nano 10-9

• Pico 10-12

Conversions within metric system

• Because system is based on 10, conversions are made easy by using a shorthand line chart

Base

Un

it

deci

centi

milli

deka

hecto

kilo

Base

Un

it

deci

centi

milli

deka

hecto

kilo

Convert 54.56 cm to km.

To convert, move decimal point 5 places to the left.

Answer: 0.0005456 km

Base

Un

it

deci

centi

milli

deka

hecto

kilo

Convert 0.1 km to meters

To convert, move decimal point 3 places to the __?___.

Answer: 100 m

Base

Un

it

deci

centi

milli

deka

hecto

kilo

Convert 20 centigrams to dekagrams.

To convert, move decimal point 3 places to the ____.

Answer: 0.02 dag

Base

Un

it

deci

centi

milli

deka

hecto

kilo

micro

nan

o

Meg

a

Gig

a

Notice that there are 3 spaces on the number line between Giga and Mega.

Base

Un

it

deci

centi

milli

deka

hecto

kilo

micro

nan

o

Meg

a

Gig

a

Notice that there are 3 spaces on the number line between Giga and Mega.

Convert 1,800,000 kilometers to gigameters.

Move decimal ____ places to the ______.

Answer 1.8 gigameters

Scientific Notation (p 23)

• Uses powers of 10 so that very large or small numbers can be expressed concisely.

• 100 =1 • 103= 1000 • 10-5 = 1/100000 or 0.00001• Each time the exponent power is increased by 1,

we are really multiplying by 10.• Each time the exponent power is decreased by

1, we are dividing by 10.

• Express 800,000 in scientific notation.• Place 1 digit in front of the decimal point

and multiply by the correct exponent.• Answer

– 8 X 10 5

• Express 80,055 in scientific notation.• Answer

– 8.0055 X 104

Scientific Notation

• Express 0.000993 in scientific notation.

• Place one digit in front of the decimal point and multiply by the correct exponent.

• Answer– 9.93 X 10 - 4

English to Metric Conversions p 18

• Convert 25 degrees Celsius to degrees Fahrenheit.

• Use one of these formulas (which one?)• C= 0.55 (F - 32)• F= 1.8(C) + 32

• F = 1.8 (25) +32

English to Metric Conversions

• A patient in a doctor’s office weighs 200 pounds. How may kg does this patient weigh?

• 1 kg = 2.21 pounds (see p 27 for conversions)• Multiply by a conversion factor which will have

the same result as multiplying by one.

200 pounds

1 kg

2.21 pounds= 90.5 kg

Special Instructions for Unit 1

• Homework assignment will be given at end of class.

• Check-out procedure: Graphing Exercise and hypothesis for your groups’ mealworm experiment.

• I. Metric Units– Read

• II. Metric Conversions– Read– Do Exercise 1.1 Practice Conversions (can do at

home.)

• III. Length Measurements– Read and do Exercise 1.2. Do some measurements

but it is not necessary to do them all. – You need to do the measurement of a dime on p. 14.

• IV. Volume– Read and do all exercises– Everyone should practice using a pipet

• V. Mass– Read and do all exercises– Note: 1 cc = 1 ml = 1 g (Must remember

this!)

• VI. Temperature– Take readings in Celsius of temps of water at

station in back. The incubator in the gray box in the back corner

– Do C to F conversions

• VII. Stat analysis– Skip this section

• Graphing data Exercise 1.7 (p 22)– Follow instructions on proper labeling of graph and

graph data given in table. (CAN COMPLETE AT HOME)

• VIII. Sci Notation– Read and do exercise (can complete at home)

• IX. Medical importance– Do medical calculations (can complete at home)

• Lab Questions p25-26– Can complete at home– Some quiz questions may be taken from these.

Scientific Method

• Unit 2

• We will set up the scientific method experiment today and will work on it for the next 2 weeks.

• Mealworm or Tenebrio molitor– Weigh mealworm this week– Place in one of 2 substrates

• Oat bran or peat moss

– Reweigh next week– Do statistical analysis of data (weight gain or loss) to

determine which substrate best supported growth of the mealworm

• Independent variable– What the investigator varies– Type of substrate

• Dependent variable– What is measured or counted– Change in mass of mealworm

• Control variables– Amount of water, amount of substrate, light

conditions, others

Review Scientific Method Terminology

• Hypothesis

• Steps on scientific method

• Discuss with your lab group a valid hypothesis for your mealwork experiment.

Scientific Research Articles

• Scientists must publish their research in a peer-reviewed journal for the information to be a part of scientific knowledge.

• Your lab reports will be similar to these research articles and will contain the following 5 sections.– Abstract– Introduction– Materials and Methods– Results– Discussion

• Research articles