a: 30 september 2011 objective: you will be able to: convert between scientific and regular...

A: 30 September 2011

Objective: You will be able to: convert between scientific and

regular notation convert between units of mass,

length and volume Do now: What unit do we use to

measure: a. Mass? b. Length? c. Volume?

Agenda

I. Do nowII. Scientific notation notes and practiceIII. Conversion between units notes and

practiceIV. Exit ticketV. Homework work time?!?Homework: Week 4 Homework pages

1-4 due TuesdayLab Notebook due Tuesday

Properties

Intensive: the property does NOT depend on the amount of stuff you have ex: temperature

Extensive: the property DOES depend on the amount of stuff you have ex: mass

Use your data to determine if density is an intensive property or an extensive property!

Scientific Notation

602,000,000,000,000,000,000,000 The number of atoms of iron in this

beaker!

Scientific Notation: A way to effectively show and compare really large or really small numbers.

Scientific Notation

8,000,000 = 8x106

0.00012 = 1.2x10-4

Integer must be 1≤x<10

Positive exponent: number > 1 Negative exponent: number < 1 (but >

0!)

Practice

a) 4,500,000b) 3,950,000,000c) 230d) 230.e) 0.00000045f) -0.002g) 0.00781

Convert to regular notation

a. 3.4x1012

b. 5.4x10-6

c. 1.2x103

d. 7.80x10-2

e. 1.20x10-8

f. 3.98x1010

g. 3x10-2

Copy the number and rewrite in scientific notation or regular notation

a. 100,000b. -5,000,000c. 450,000,000,000d. 1,300e. 0.01f. 0.00 005g. -0.0 045h. 0.00 000 000 000 000

023

a. 2.3 x10-2

b. 1.99 x104

c. 9 x10-8

d. 6.505 x10-12

e. 1.00 x10-4

f. 4.55 x1015

Remember…

A negative exponent is a tiny number but is bigger than 0 (NOT a negative number!)

A big positive exponent is a HUGE number.

A negative number can have either a positive exponent or a negative exponent.

Round to three sig. fig. and express in scientific notation

a) 745,000b) 0.00054000c) 540,321,324d) 0.143589

C: 3 October 2011

Take Out Homework: Week 4 p. 1 Objective: You will be able to:

convert between units of mass, length and volume

Do now: What unit do we use to measure: a. Mass? b. Length? c. Volume?

Agenda

I. Do now (6 min.)II. Homework Check (5)III. SI units and prefixes notes (5)IV. Conversions examples (10)V. Conversions practice problems (10

min.)VI. Go over answers (5 min.)VII. Exit Ticket (10 min.)Homework: Week 4 pages 2-4: due Weds.

Unit Conversions

SI Units for Measurement

Quantity Unit Symbollength meter mmass gram gvolume liter Ltime second s

Unit Prefixes

But what if it’s not practical to use a meter or a liter or a gram?

You want to measure something much smaller or larger?

SI Unit Prefixes

Prefix Symbol Meaningkilo- k 1000(meter, liter, gram)centi- c 1/100milli- m 1/1000 So what does that mean?

1 meter = 100 centimeters 1 kilometer = 1000 meters

Converting between units

Example 1: How many meters are equal to 5 kilometers?

Example 2: How many milliliters are equal to 75.0 liters?

Example 3: How many kilograms are equal to 2,500 grams?

C: 5 October 2011

Take Out Homework: Week 4 p. 2-3 Objective: You will be able to:

convert between units of mass, length and volume

differentiate between physical and chemical properties and changes.

Do now: How many centimeters are equal to 4.50 meters?

Agenda

I. Do now (6 min.)II. Homework Check (5)III. Conversions practice problems (10 min.)IV. Go over answers (5 min.)V. Exit Ticket (10 min.)VI. Chemistry, physical and chemical

changes and states of matterHomework: Week 4 page 4: Thurs.

Week 5 Homework page 1: Thurs.

Homework Check

Practice Problems

1 meter = 100 cm, 1 kilometer = 1000 meters

1. How many meters are equal to 500 centimeters?

2. How many centimeters are equal to 850 meters?

3. How many meters are equal to 37.5 kilometers?

4. How many centimeters are equal to 5.8 kilometers?

Practice Problems

1 liter = 1000 milliliters1. How many liters are equal to 550

milliliters?2. How many milliliters are equal to 3.5

liters?3. How many liters are equal to 45,000

milliliters?4. How many milliliters are equal to

354 liters?

Exit Ticket

Next PowerPoint!