Download presentation

1
2.1 - Scientific Notation

2
Scientific Notation Numbers that are extremely large can be difficult to deal with…sooo Scientists convert these numbers into scientific notation Scientific notation expresses numbers as a multiple of two factors: A number between 1 and 10 (only 1 digit to the left of the decimal!) Ten raised to a power

3
For example: A proton’s mass = kg If you put it in scientific notation, the mass of a proton is expressed as x kg Remember: When numbers larger than 1 are expressed in scientific notation, the power of ten is positive When numbers smaller than 1 are expressed in scientific notation, the power of ten is negative

4
**Try these: Convert 1,392,000 to scientific notation. = 1**

Try these: Convert 1,392,000 to scientific notation. = x 106 Convert 0.000,000,028 to scientific notation. = 2.8 x 10-8

5
**Adding and Subtracting using Scientific Notation**

Make sure the exponents are the same!! 7.35 x x 102 = 9.78 x 102 If the exponents are not the same, you have to make them the same!! Tip: if you increase the exponent, you decrease the decimal if you decrease the exponent, you increase the decimal Example: Tokyo pop: x 107 Mexico City pop: x 106 = 1.56 x 107 Sao Paolo pop: x 108 = 1.65 x 107 NOW you can add them together and carry thru the exponent Total= 5.91 x 107

6
**Multiplying and Dividing using Scientific Notation**

Multiplication: Multiply decimals and ADD exponents Ex : (1.2 x 106) x (3.0 x 104) = 3.6 x = 10 * Ex: (1.2 x 106) x (3.0 x 10-4) = 3.6 x (-4) = 2 Division: Divide decimals and SUBTRACT exponents Ex: (5.0 x 108) ÷ (2.5 x 104) = 2.0 x – 4 = 4 *Ex: (5.0 x 108) ÷ (2.5 x 10-4) = 2.0 x – (-4) = 12

7
**2.2-2.3 - Measurements and Units**

8
**Units of Measure SI units: Systeme Internationale d’ Unites**

standard units of measurement to be understood by all scientists Base Units: defined unit of measurement that is based on an object or event in the physical world there are 7 base units some familiar quantities are time, length, mass, and temp

9
Time second (s) Many chemical reactions take place in less than a second so scientist often add prefixes, based on multiples of ten, to the base units. ex. Millisecond Length meter (m) A meter is the distance that light travels though a vacuum in 1/ of a second. What is a vacuum? Close in length to a yard. Prefixes also apply…ex. millimeter

10
**Mass mass is a measurement of matter kilogram (kg) about 2.2 pounds**

Masses measured in most laboratories are much smaller than a kilogram, so scientists use grams (g) or milligrams (mg). How many grams are in a kilogram? 1000 How many milligrams are in a gram?

11
**Derived Units Not all quantities are measured in base units**

A unit that is defined by a combination of base units is called a derived unit. Volume and Density are measured in derived units.

12
Volume The space occupied by an object Unit = cm3 = mL Liters are used to measure the amount of liquid in a container (about the same volume as a quart) Prefixes also applied…ex. milliliter

13
**Modified Table 2.1 – The Base Units**

Quantity Base Unit Time Second (s) Length Meter (m) Mass Kilogram (kg) Temperature Kelvin (K) Amount of a substance Mole (mol) Electric current Ampere (A) Luminous intensity Candela (cd)

14
**Modified Table 2.2 – SI Prefixes**

Symbol Numerical Value in Base Units Power of 10 Equivalent Giga G 1,000,000,000 109 Mega M 1,000,000 106 Kilo K 1000 103 -- 1 100 Deci d 0.1 10-1 Centi c 0.01 10-2 Milli m 0.001 10-3 Micro 10-6 Nano n 10-9 Pico p 10-12

Similar presentations

Presentation is loading. Please wait....

OK

Section Units of Measurement

Section Units of Measurement

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on cloud storage Ppt on 14 principles of management Ppt on regional trade agreements Ppt on petroleum industry in india download Ppt on needle stick injury prevention Ppt on national education day 2016 Ppt on my favourite game cricket Ppt on old age homes Ppt on domain name system Ppt on world trade organisation