Thursday 19 February 2015

Writing Ionic Formulae

We looked at a very tricky skill today - writing ionic formulae from their names:



Tuesday 17 February 2015

Naming Difficult Ions

We are given an ion table and Periodic Table in our assessment, so we can use these together to name our ions. However, there are some difficult ones that we just have to learn:


Here are the other ones (below). If they are made up of just one element, we get their name from the Periodic Table. If they are made up of more than one element (and not in the list above), we do not need to know them.


Displacement and the Activity Series

Over the past few lessons, we have been looking at displacement reactions (metal + ionic solution). If we observe any change, we infer that a chemical reaction has occurred.

From our observations, we ranked the metals in an Activity Series:




Then, we were given some observations and asked to rank these new metals:



Thursday 5 February 2015

Predicting Precipitation

As part of the assessment of this task, we need to predict whether a precipitate will form or not. We also need to say why we think a precipitate will/will not form.

NOTE: The silver product should be silver carbonate. Someone asked a really good question 
while I was writing this up and I left it blank - sorry!

Using word equations is a really good place to start. Once we know the names of the products, we can use Solubility Rules to see if one of the products is insoluble or not.




On Tuesday, we worked out a few new rules that really help. These are worth remembering off by heart:

Tuesday 3 February 2015

Solutions, Suspensions and Precipitates

Today, we learned about one type of reaction - precipitation. Before we could, we first needed to learn what a solution is.





After this, we were given a range of solutions. We mixed combinations of any two solutions and recorded if a precipitate formed or not.