The basics
This presentation is the property of its rightful owner.
Sponsored Links
1 / 25

The Basics PowerPoint PPT Presentation


  • 36 Views
  • Uploaded on
  • Presentation posted in: General

The Basics. Reminders about simple terms and concepts. Zumdahl Chapter 3. Equations. Zn + H + + Cl - ----> Zn 2 + + Cl - + H 2. Equations. Zn + 2H + + Cl - ----> Zn 2 + + Cl - + H 2. Equations.

Download Presentation

The Basics

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


The basics

The Basics

Reminders about simple terms

and concepts.

Zumdahl Chapter 3


Equations

Equations

Zn + H+ + Cl- ----> Zn2+ + Cl- + H2


The basics

Equations

Zn + 2H+ + Cl- ----> Zn2+ + Cl- + H2


The basics

Equations

Zn + 2H+ + 2Cl- ----> Zn2+ + 2Cl- + H2


The basics

Equations

Zn + 2H+ + 2Cl- ----> Zn2+ + 2Cl- + H2

Zn + 2(HCl) ----> Zn2+ + 2Cl- + H2


The basics

Equations

Zn + 2H+ + 2Cl- ----> Zn2+ + 2Cl- + H2

Zn + 2(HCl) ----> Zn2+ + 2Cl- + H2

Zn + 2H+ ----> Zn2+ + H2


The basics

Equations

Zn + 2H+ + 2Cl- ----> Zn2+ + 2Cl- + H2

Zn + 2(HCl) ----> Zn2+ + 2Cl- + H2

Zn + 2H+ ----> Zn2+ + H2

Zn(s) + 2H+(aq) ----> Zn2+(aq) + H2(gas)


The basics

Equations

Zn(s) + 2H+(aq) ----> Zn2+(aq) + H2(gas)

- means that on an atomic ratio, 1 Zn atom reacts with

2 H+ions to produce 1 Zn2+ ion and 1 hydrogen

diatomic molecule.

- we don’t work on an atomic scale very often so we

define a new unit which is a bunch of atoms or

molecules.

- we don’t count atoms very often so we work in the

mass of that bunch.


Moles and molar masses

Moles and Molar Masses

The ‘bunch’ I alluded to earlier is the number of atoms

contained in exactly 0.0120000 kg of carbon which contains

only the 12C isotope. ( 6 protons + 6 neutrons in the

nucleus.)

We call this unit the MOLE.

1 mole is 6.023 x 1023 particles

Avogado Number.


The basics

Moles and Molar Masses

Thus the MOLAR MASS is just the mass of a mole of any

particular substance. May also be referred to as the atomic

or molecular weight.

H = 1.0079 g / mol = 0.0010079 kg / mol

CO2 = 44.009 g / mol = 0.044009 kg /mol

Conceptually, this allows us to compare and calculate

relative amounts of material.


Stochiometry

Stochiometry

Zn + 2(HCl) ----> Zn2+ + 2Cl- + H2

one mole of zinc metal reacts with two mole of hydrogen

chloride to produce one mole of zinc ions two moles of

chloride ions and one mole of hydrogen gas.

65.39 g Zn + 72.92 g HCl ----> 65.39 g Zn2+ +

70.91 g of Cl- + 2.01 g of H2


Ideal gases zumdahl chapter 5

IDEAL GASESZumdahl, Chapter 5


Basic definitions

Basic Definitions

  • Amount in moles ( mol )

  • Pressure in Pascals ( N m-2 )

  • Volume in metre3 ( m3 )

  • Temperature in Kelvin ( K )


Pressure

Pressure

Pressure = force / area

= Newtons / metre2

= Pascals

.


Pressure1

Pressure

Pressure = force / area

= Newtons / metre2

= Pascals

Standard atmospheric pressure = 101 325 Pascals


The basics

Pressure

Pressure = force / area

= Newtons / metre2

= Pascals

Standard atmospheric pressure = 101 325 Pascals

This is equivalent to 1.000 atm or a pressure that

will support a column of mercury 760 mm tall in a

barometer.


Volume

Volume

Measured in metre3 which may not be convenient.

More common to use litres but :

1 L = 0.001 m3


Temperature

Temperature

We need an absolute temperature scale. i.e. one for

which zero means something.

We use the Kelvin scale on which ice melts at 273.2 K

or 0K is -273.2 oC.


Boyle s law

Boyle’s Law

volume is proportional to 1 / pressure

P1V1 = P2V2

For a fixed amount of gas at constant temperature.


Charles law

Charles’ Law

Volume is proportional to absolute temperature

V1 / V2 = T1 / T2

For a fixed amount of gas at constant pressure.


The basics

He

N2

V

-273

0

T o C


Equation of state

Equation of state

PV = n RT

R = 8.3145 Nm mol -1 K -1

= 8.3145 J mol-1 K -1

For an ideal gas.


The basics

Equation of state

PV = n RT

If you know any three of P, V, n, and T,

you can calculate the fourth.

What is the volume occupied by 2.30 moles

of helium at 313 K and 217 kPa?


The basics

What is the volume occupied by 2.30 moles

of helium at 313 K and 217 kPa?

V = n R T / P

V = 2.30 mol x 8.31 Nm mol-1 K-1 x 313 K / 217 x 103 Nm -2

V = 0.0276 m3


The basics

What is the volume occupied by 2.30 moles

of helium at 313 K and 217 kPa?

V = n R T / P

V = 2.30 mol x 8.31 Nm mol-1 K-1 x 313 K / 217 x 103 Nm -2

V = 0.0276 m3

DOES THIS MAKE SENSE??????????


  • Login