Conservation of mass 1

reactions and compounds

KEy question:

Whats it the difference in mass between the reactants and products?

Task 1 - Do now

Have a look at the do now task on the companion sheet.

There is an equation - I woulld like you to fill in the yellow boxes with the words in the box.

Challenge: write the symbol equation too

Task 2 - word equations

Word equations essentially 'tell the story' of what is happening in the reaction we are describing.

Have a read of this example below. It 'tells the story' of the reaction between Hydrochloric acid and Magnesium. Because these to are reacting with each other, we call them the reactants. It then goes on to tell us that two new things are prodcued by the reaction. These are Magnesium Chloride and Hydrogen. Because these are being produced by the reaction, we call them the products.

The question asks us the write the word equation for the reaction. There are a couple of rules.

Reactants are always on the left of the equation.
Products are always on the right of the equation.
The whole equation has to go on one line and cannot cross over onto a second line.
Generally, metals go before non-metals and gases come at the end.

Solution:

Magnesium + Hydrochloric acid ➔ Magnesium Chloride + Hydrogen.

Now complete the word equations on the companion sheet

Task 3 - Naming compounds

Watch the video to recap the basics fo naming compounds.

read the information below for more detail on how we name commonn compounds.

Then complete the task on the companion sheet

Chemical compounds: names and formulae

The name of a chemical compound tells us about the elements that it is made from. The simplest compounds are made of only two elements. The names of these compounds have two parts. The first part is often a metal element, and the second part is usually a non-metal, with the ending ‘-ide’. An example is magnesium oxide.

Many compounds are made of three or more elements. Often, one of these elements is oxygen. The names of many of these compounds have an ‘-ate’ ending, for example copper sulphate (CuSO4).

The formula of the compound tells us:

• which elements are in the compound

• the proportions of each element present.

In copper sulphate there are four atoms of oxygen and one atom of sulphur for each one of copper.

TASK: Work through the questions on the companion sheet

Task 4 -

COnservation of mass

Watch the video introducing the concept of the conservatino of mass, then answer the 4 questions about it to complete the companion sheet.

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