ATOMS & SPEED (Homework 2 to be worked but not turned in)

(1-15-10)

Diameter= 0.5 to 2.5 x 10^-8 cm (which is scientific notation, i.e., “economical”)

Scientific notation General (expanded) notation)

1 x 10^-8 cm = ____________________________

How many inches is 1 x 10^-8 cm? (1in = 2.54cm; 0.394in = 1cm)

Mass proton= 1.672 x 10^-24 g

electron= 9.108 x 10^-28 g

“Mole”= 6.02 x 10²³ atoms of an element.

The atomic weight expressed in grams of an element will contain a mole of atoms

Element Mass of 1 mole

Li _____________

Ru _____________

1 mole of Ru is how many ounces? (1 oz = 28.35 g; 1 g = 0.0353 oz)

Speed of Light (in vacuum)

General Scientific

186,000 mi/s = _______________________

_____________________ = 3 x 10¹⁰ cm/s