Thermochemistry+and+Equilibrium

Achievement Standard 90310: Discuss information about thermochemical and equilibrium systems. Energy Changes: Recall that energy changes in a reaction can be classified as either exothermic or endothermic, depending on whether energy is lost to the surroundings or absorbed from the surroundings. It takes energy to break a bond, therefore bond breaking is endothermic, and bond forming is exothermic. Have a go at this simple worksheet based on how much energy is involved in reactions. - Rates of Reaction Revision

- Enthalpy Revision

Home learning for Break 3: work through the following Learning Guide please:



The concept of Equilibrium: media type="youtube" key="LBjRDF4XV8Q?fs=1" height="296" width="404"  Equilibrium Revision Sheet: __Acids and Bases:__

Go to this link: [|Introduction to acids and bases] and read throught the tutorial. It gives a really good overview of the Bronsted Lowry theory, the concept of an acid and a base and allows you to do a short online quiz summarising what you have read.

media type="youtube" key="RF40cI2O16U?fs=1" height="285" width="418" The YouTube clip above is created by a student. It quite clearly goes over concepts you need to be familiar with for your external. Khan Academy: Blackboard run through of Acids and Bases: media type="youtube" key="vShCnTY1-T0?fs=1" height="326" width="427" Common Acids and Bases and their pH: media type="custom" key="7121239" width="140" height="140" Revision: Definitions of acids and bases etc:



pH and pOH - have a go at this interactive online game: [|Rags to Riches]

Also this [|pH Tutorial] is worth reading over in order to reitterate acids and bases, equilibrium constants, Kw and pH.

Calculating pH revision sheet:

This [|Acids and Bases simulation] gives you an online go at a similar activity to the practical carried out in class. You use a pH meter to measure the pH of various substances at various concentrations. Before you have a go at the simulation have a go at the questions in the below worksheet - it will enable you to better understand the concepts of strong and weak acids and bases.

Practice Exam and answer schedule:

-remember you can go to [|www.nzqa.govt.nz] for more past papers.

Use these as templates for your answers to help move yourself from A to M and E :-)