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Density Prac Problem

water = 25. 1 mlWe also discuss several other topics like What is the school of thought that studies the purpose of the conscious mind?

water + metal = 36.8ml

metal = 101.4 grams

D = m/v  

We also discuss several other topics like Compare the system levels in computers and humans.

Chemistry is done by experiment

Experiments require measurements We also discuss several other topics like What are the different ways for polymers to connect?

Quantity : quality or Number : Unit Don't forget about the age old question of How does genetic drift occur in natural populations?

Numbers in science can be very large or very well

Mass of the earth = 6 x 1024 Kg We also discuss several other topics like What is allopatric speciation?
Don't forget about the age old question of How are populations and samples related?

Mass of electron = 9.11 x 10-28 g

Scientific Notation

N x 10TP 

1  N < 10   “N” is equal to or greater than 1

                But less than 10

“P” is an integer that counts the number of places the decimal point moved. If the decimal moved right it will be negative. If it moved left it will be positive.

60000,000

            starting point

        ← moves left = positive = 6.0 x 10> 

0 00000006

 

starting point

moves right → = negative = 6.0 x 10-8 

Speed of light 3.00000000. m/s = 3x108 m/s

                  ← moves left = positive

Dimensional Analysis or Unit Conversions

22.8 inches in centimeters.

We need.

1. Unit Equality → units in problem

2. Set of 2 conversions

3. Multiply by correct conversion factor

    1 in = 2.54cm      = 1  = 1

                        = 58cm or 57.912cm

160 lb → kilograms

                

                   = 72.73 Kg

55 gal → liter                 1gal = 3.79L

 = 208.y5 L

Modern Atomic theory explain experimental data by designating 3 “ sub - atomic “ particles:

1. Proton

2. Neutron

3. Electron

Particle

Mass (g)

Columns charge

Unit charge

Electron

9.11x10-28 

-1,6022x10-19 

• 1        

Proton

Neutron

1.67 x - 10-24

1.67 x - 10-24

+1.6022 x 10-19

        O

+1

O

Relative mass

0.00053

1

1

Abricuiation

e-

p+

no 

In any atom #e- = # p+ 

Massp = mass n = 1840 x mass e- 

The # of P+ identifies the element. It is called the atomic number and is represented by “ ”

                H → 1 p + = 1

           → weighted average

            c = 2 p + = 2

           → weighted average

• Use  to obtain symbol + name
• Use symbol or name to obtain

13 → aluminum → AI

27 → cobalt → Co

 Iodine → 53p+ → I

I so topes are atoms of the same element (same p+ , same  # ) but different # of neutrons.

                        I so tope designation

                        Nuclear symbol          A = 1

                                                Ƶ = 1

                        

The A # identifies the isotope through the

Nuclear Symbol ()

Hyphen.Notation

Hydrogen - 1

99.985% H-1

Protium

(only has special names for its isotopes)

(how likely it is/how abundant in nature)

Hydrogen - 2

0.015%H-2

Deuterium

Hydrogen - 3

Trace H-3

Tritium

References: