In this thing learners will again conference the reactions of selected steels with oxygen that were used as examples in the previous chapter. In this chapter, however, there will certainly be a greater focus on the actual reactions - these need to be prove to the class - and the commonalities between them. When again, the composing of chemical equations will certainly be scaffolded by the procedure of starting with a native equation (macroscopic representation) and progressing v a photo equation (submicroscopic representation) to finish at the chemistry equation (symbolic representation).

You are watching: When iron reacts with oxygen to form rust, each iron atom

The contents has likewise been gift in a slightly different order to CAPS in the the instance reactions are an initial explored, and then the basic reaction of metals with oxygen is explained, when learners have currently seen example chemical equations.

3.1 The reaction the iron v oxygen (1 hour)




Activity: Three different levels of translate in science

Sorting and also classifying, interpreting, identifying

Optional (Revision)

Activity: The reaction of iron through oxygen

Demonstration of stole wool burning, observing, recording, communicating, describing

CAPS suggested

3.2 The reaction v magnesium and also oxygen (1 hour)




Activity: The reaction the magnesium with oxygen

Demonstration that magnesium burning, observing, recording, communicating, describing

CAPS suggested

3.3 The general reaction of metals with oxygen (0.5 hours)

(Questions within the text)

3.4 The development of rust (1.5 hour)




Activity: The reaction in between iron and also oxygen in air

Demonstrating, observing, recording, describing,

Optional (Suggested)

Activity: Why is rust a problem?

Identifying problems and issues

Optional (Suggested)

3.5 methods to protect against rust (0.5 hours)

(Questions within the text)

What happens once a metal reacts with oxygen? What is the product called? How have the right to we stand for the basic reaction in between a metal and also oxygen? What is a burning reaction? What is rust and how does that form? How deserve to iron be made more rust-resistant?
In the vault chapter, we learnt how to write and also balance equations. The three examples we learnt around were:

magnesium + oxygen → magnesium oxide

iron + oxygen → stole oxide

copper + oxygen → copper oxide

Which teams do magnesium, iron and also copper come from?

Magnesium is group 2, stole is team 8 and also copper is group 11. This is important as aspects in the same group will reaction similarly.

In this reactions, the aspects that react through oxygen room all metals. If you room not convinced of this, uncover them on the periodic Table below in the prior of her book. Can you view that they are all discovered in the region occupied by the metals? Where room metals located on the periodic Table?

On the left.

The name of the assets of the 3 reactions over have other in common. Create down the names. Have the right to you check out what they have actually in common?

The commodities are: magnesium oxide, steel oxide, copper oxide. Lock all have actually "oxide" in their name.

The commodities are every metal oxides. What exactly are steel oxides? as we will see later on when we attract diagrams and also write formulae to stand for these reactions, they room compounds in i m sorry a steel is an unified with oxygen, in some addressed ratio.

The steels will react similarly with the other aspects in the same group as oxygen (group 16).

We room going to look at 2 of the reactions displayed previously in greater detail in this chapter. Remember the they room not the just reactions of steels with oxygen; they are simply the ones that have actually been chosen as examples.

First, we will certainly observe the yes, really reactions. Her teacher will certainly demonstrate, while you do observations. Later on we will write about these reactions making use of "scientific language" together we create reaction equations for each one. Prior to we start, below is a reminder of miscellaneous we disputed in thing 1.

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Three different levels of interpretation in science In the an initial chapter the Gr. 9 Matter and Materials, us learnt the scientists interpret chemical reaction on three various levels. Those three levels are:

the macroscopic level; the submicroscopic level; and also the symbolic level.

stole wool rotate creates amazing photos together the steel burns in oxygen and also creates orange sparks.
iron shavings look favor sparks when they burn in the blue flame of a Bunsen burner.

it is recommended the you show this reaction to the learners, due to the fact that of the hazards connected when burning metals.

Safety precautions come observe during the demonstrations:

Wear safety goggles and a security coat. Practice caution when burning the steel wool, as sparks may be produced. Learners have to be cautioned against standing too close throughout the demonstration. Place a clean maker or watch glass underneath come catch any kind of metal oxide the forms throughout the reaction. Students have the right to examine the reaction product afterwards to formulate their observations.


Bunsen burner or heart burner matches safety and security goggles stole wool tongs


your teacher will show the burning of iron in oxygen (which is current in air). You have to make mindful observations throughout the demonstration and also write these under in the spaces detailed below. To guide you, part questions have been provided.