Free Powerpoint Presentations

Atoms and molecules
Page
1

DOWNLOAD

PREVIEW

WATCH ALL SLIDES

Slide 1

More about atoms and molecules

More about atoms and molecules

Slide 2

What is an atom mostly made of?

What is an atom mostly made of?

A) The nucleus

B) Electrons

C) Empty space (nothing)

Slide 3

What is an atom mostly made of?

What is an atom mostly made of?

A) The nucleus

B) Electrons

C) Empty space (nothing)

Slide 4

The sizes of things in an atom

The sizes of things in an atom

The nucleus of an atom is very small compared to the size of the atom

Electrons are also very small compared to protons and neutrons

If a proton were the size of a marble, an electron would be about the width of a human hair, and the electron would be about 4 kilometers away from the proton.

Slide 5

The Rutherford Model of the Atom

The Rutherford Model of the Atom

The Rutherford Model of the atom is a simple way of thinking of an atom

It is not correct in some ways

In the Rutherford Model, electrons move around (orbit) the nucleus like planets moving around the sun

Slide 6

Probability

Probability

Probability is the chance that something will happen

It is a number between 0 (definitely wont happen) to 1 (definitely will happen)

If I roll a 6-sided die, the probability of rolling a 6 is 1/6 (0.167). It is the same probability for rolling any of the numbers on the die.

Slide 7

Electron Orbitals

Electron Orbitals

Electrons have a certain probability of being in a certain place at any time.

This probability has a shape called an orbital

We dont really know where electrons are at any time, but we know their orbitals (where they might be)

Slide 8

Ions

Ions

An ion is an atom or molecule in which the # of electrons is not equal to the # of protons

This gives the atom an overall positive or negative electrical charge

If it has a positive charge its called a cation.

If it has a negative charge its called an anion.

Slide 9

Avogadro Constant and Mole

Avogadro Constant and Mole

Avogadro constant is a number, and is about 6.022×1023 or 602,200,000,000,000,000,000,000

A mole is the amount of any substance that has an Avogadros constant (6.022×1023) atoms or molecules

Mole is also the name of an animal that lives underground

Slide 10

How to use a mole

How to use a mole

Go to page:
 1  2 

Contents

Last added presentations

2010-2018 powerpoint presentations