**Scientific**

Notation

Notation

**Mass, Volume,**

and Density

and Density

**Significant digits**

Steps to write Scientific Notation

Make the number between one and 10

10345000 --> 1.0345

Add x 10

1.0345 x 10

a= the number of decimal places the decimal must shift to get to the original number

move to right = positive number

move to left = negative number

1.0345 x 10^7 = 10345000

Examples

1006780000000 = 1.00678 x 10

.00000000567 = 5.67 x 10

**Always use scientific notation for numbers larger than 1000 and smaller than .0001**

Volume

lengh x width x height = volume

Cubic

Solid

Defined as the amount of space an object takes up

Usually measured with a graduated cylinder for liquids and a ruler for cubic solids

Units of measurement for liquids: Liters (L) or milliliters (mL) usually

Units of measurement for solids: cubic meters (m ) or cubic centimeters (cm ) usually

M

D

V

Significant digits in Chemistry are very important. The Significant digits of all numbers are those digits that carry meaning contributing to its precision. We follow simple rules to determine which digits are significant

First, lets learn about...

What is Scientific Notation?

Scientific notation is simply a way to write really large numbers or really small numbers in a convenient decimal formation. There are three simple steps to follow to write a number in Scientific Notation

1

2

3

a

a

12

-9

Practice

Convert the following numbers to Scientific notation

.00012 = _________

361000000 = _________

809200 = __________

.000000479 = _________

Convert the following numbers from Scientific notation to their original form

1.23 x 10 = _________

5.99 x 10 = _________

4.315 x 10 = _________

7. 31 x 10 = _________

3

-4

6

-2

Second, lets learn about...

Third, lets learn about...

Still need help? Check out this video tutorial on Scientific Notation from the Khan Academy.

Mass

Mass is a measure of the amount of matter.

Mass is the measurement you make using a balance in the lab!

Usually expressed as grams (g) or Kilograms (kg)

Matter....

is defined as anything that has MASS and takes up space!

Liquids

graduated cylinder

For irregularly shaped solids we use a technique called

Water Displacement!

You simply take the volume of water before you add the irregularly shaped object, than the volume of water after you add the object.... then subtract the two numbers to find the volume of the irregularly shaped object.

9 mL - 7 mL = 2 mL

Non-zero digits and zeros between non-zero digits are always significant

leading zero's are never significant

zero's to the right of all non-zero digits are only significant if a decimal point is shown.

For values written in scientific notation, the digits in the coefficient are significant.

Rules for Significant figures

Examples

1.005 mL = 4 sigdigs

.000046 m = 2 sigdigs

8000 mg = 1 sigdig

930.0 L = 4 sigdigs

10003.400 cm = 8 sigdigs

.003820 kg = 4 sigdigs

35.50 mL = 4 sigdigs

Practice !

100.30 = ________ sigdigs

100000 = ________ sigdigs

50500 = _______ sigdigs

893.100 = _______ sigdigs

1.09 x 10 = _______ sigdigs

3.20 = ________ sigdigs

.0000992 = _________ sigdigs

200. = _______ sigdigs

Need some extra help... no problem! Check out this video from Khan Academy for further explanation.

Density

Density is a measure of mass per unit volume

Objects/liquids with a low density float on top of objects/liquids with a higher density!!

M = D x V

D =

V =

M

V

M

D

**INTRODUCTION TO CHEMISTRY**

THE BASICS

THE BASICS

**Mrs. Robinson**