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DO NOW: Match each prefix with its correct meaning.PowerPoint Presentation

DO NOW: Match each prefix with its correct meaning.

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DO NOW:Match each prefix with its correct meaning.

- 1. decaa. 1/ 10 = 0.1
- 2. millib. 1000
- 3. centic. 100
- 4. decid. 1/1000 = 0.001
- 5. hecto e. 10
- 6. kilo f. 1/100 = 0.01

What is the temperature?

The temperature of an object describes

how hot or cold the object is relative to other

objects.

Temperature scales

Scientists use two temperature scales to

measure temperature.

* the Celsius scale (°C)

* the Kelvin scale (K)

Celsius Scale

The Celsius scale will be used in most of

your experiments. On the Celsius scale, the

freezing point of water is defined as 0°C

and the boiling point of water is defined as

100°C.

Kelvin Scale

A Kelvin is the SI base unit of temperature.

On the Kelvin scale, water freezes at about

273K and boils at about 373K.

Practice Problems

Convert each temperature from °C to K.

°C + 273 = K

a. 54 °C = __________ K

b. 69 °C= __________ K

c. 15 °C= __________ K

Practice Problems

Convert each temperature from K to °C.

K – 273 = °C

a. 32 K = __________ °C

b. 0 K = __________ °C

c. 281 K = __________ °C

Scientific Notation

Extremely small and extremely large

numbers can be compared more easily

when they are converted into a form called

scientific notation.

Expressing Quantities in Scientific Notation

The surface area of the Pacific Ocean (the

largest ocean) is 166,000,000,000,000 m2.

(That’s 166 trillion square meters.) This

quantity in scientific notation is expressed as

1.66 x 1014.

Steps to write scientific notation:

- Move the decimal point right or left to produce a factor that is between 1 and 10.
- Count the number of places you moved the decimal point. This number is the exponent (n).
- Multiply the factor by 10n.
- When the decimal point moves to the left, n is positive. When the decimal point moves to the right, n is negative.

Practice Problems

a. 50,000 m/s2 =

Practice Problems

b. 0.00000000062 kg =

Adding / subtracting using scientific notation

To add or subtract quantities written in

scientific notation, the quantities must have

the same exponent. If two quantities are

expressed by different powers of ten, you

must change one of the quantities so that

they are both expressed to the same power

of ten before you add you subtract.

Practice Problems

a. 5.10 x 1020 + 4.11 x 1021

Practice Problems

b. 6.2 x 108 - 3. 0 x 106

Multiplying / dividing using scientific notation

When multiplying or dividing quantities

written in scientific notation, the quantities

do not have to have the same exponent.

For multiplication, multiply the factors, then

add the exponents. For division, divide the

factors, then subtract the exponents.

Practice Problems

a. (12 x104m)(4 x 10-2m)

Practice Problems

d. (90 x 1014kg) / (9 x 1012kg)