Week 10

Question 1

Chemical reactions

Answer 1

Any process that leads to chemical transformation and is often performed in solution - solvents

Question 2

Conservation of mass

Answer 2

Mass must remain constant over time and cannot be created or destroyed but can be rearranged

Question 3

What is a mole

Answer 3

6.022 x 10^23

Question 4

Moles = ?

Answer 4

Moles (mol) = mass (g) / molar mass (g mol ^-1)

Question 5

High energy system

Answer 5

High energy potential

Question 6

Low energy system

Answer 6

Low energy potential

Question 7

Force

Answer 7

F = -dE/dx

Force is a measure of how energy changes with distance

Question 8

Power

Answer 8

P= dE/dt

Question 9

Attractive force and repulsive force

Answer 9

Attractive force pushes things toward zero - makes things closer
Repulsive pushes things away

Question 10

Potential well

Answer 10

A region surrounding potential energy. This energy cannot convert to other energy because it is trapped

Question 11

Electrostatic potential

Answer 11

Atoms not governed by potential energy are governed by electrostatic potential
The interaction of charges is described by Coulombs Law

Question 12

Covalent vs ionic bonds

Answer 12

Covalent bonds are quite strong have lots of directionality and have a short range
Ionic bonds have lots of strength no directionality and medium range

Question 13

Properties of bonds

Answer 13

Stable bond length
Have to use energy to compress or pull apart the bond
When a bond is formed energy decreases
Binding energy is needed to put in to break the bond
Width of the well dictates distance over with which things interact
- described the range of the bond