reactions-of-metals-with-oxygen-powerpoint_ver_2 (1).pptx

Reaction between metal and oxigen

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2. New Words Combustion the chemical process in which a substance reacts rapidly with oxygen and gives off heat Metal Oxide the product formed when a metal reacts with oxygen Rust an orange-brown solid that forms on metal and flakes off easily the addition of oxygen to an element and the loss of electrons Oxidation

3. Properties and Examples of Metals a solid material at room temperature conducts heat and electricity hard, shiny, and malleable tends to donate electrons Examples Iron Magnesium Copper Silver Tin Properties

4. The reaction of Iron with Oxygen The General Reaction Some metals react with oxygen in a process called combustion . When these metals are burnt in air containing oxygen, the product is called a metal oxide . Let’s look at two examples: The reaction of Magnesium with Oxygen

5. Picture Equation + Oxygen Iron Reaction of Iron with Oxygen When iron is burnt in air that contains oxygen, the product formed is iron oxide . Word Equation: iron + oxygen i ron oxide Chemical Equation: Fe + O 2 Fe 2 O 3

6. Reaction of Iron with Oxygen Practical Investigation We will use steel wool in the demonstration. Steel wool is wire wool made of very fine steel threads. Steel is an alloy made mostly of iron. The teacher can do this investigation to demonstrate what happens when iron reacts with oxygen. You will need: Steel wool Long- nose pliers Bunsen/spirit burner Matches Safety goggles

7. Reaction of Iron with Oxygen Practical Investigation Procedure: Use the pliers to hold a small amount of steel wool. Place the steel wool over the flame of the bunsen burner. Observe what happens. 1. 2. 3.

8. Reaction of Iron with Oxygen Practical Investigation Observation: The heat cause the iron to react with oxygen surrounding the steel wool. This reaction creates the spark we see and release of heat that heats up the next iron molecule. The very bright light is because of the extreme heat. Once the steel wool has burnt, it is a greyish colour and can no longer be ignited. This is proof that the steel wool has been chemically changed into the compound of oxide.

9. Reaction of Iron with Oxygen Practical Investigation What was the colour of the flame of the burning iron? A: Yellow What is the colour of the product formed? Name the product formed? Write a balanced chemical reaction for the reaction between iron and oxygen. 1. 2. 3. 4. A: Brown A: Iron oxide A: 4Fe 2 + 3O 2 2Fe 2 O 3

10. Reaction of Magnesium with Oxygen When magnesium is burnt in air that contains oxygen, the product formed is magnesium oxide . Word Equation: magnesium + oxygen magnesium Chemical Equation: Mg + O 2 MgO Picture Equation + Oxygen Iron

11. Reaction of Magnesium with Oxygen Practical Investigation We will use Magnesium ribbon in the demonstration. A thin ribbon of magnesium metal is used in laboratory demonstrations and in the magnesium lamp. The teacher can do this investigation to demonstrate what happens when magnesium reacts with oxygen. You will need: Piece of magnesium ribbon Long- nose pliers Bunsen/spirit burner Matches Safety goggles

12. Reaction of Magnesium with Oxygen Practical Investigation Procedure: Take about 50mm of magnesium ribbon. Use the pliers to hold a small amount of magnesium ribbon. Place the magnesium ribbon in the flame of the bunsen burner until it ignites. 1. 2. 3. Observe what happens. 4.

13. Reaction of Magnesium with Oxygen Practical Investigation When the magnesium metal burns, it reacts with oxygen found in the air to form magnesium oxide. Observation: After it burns, it forms a white powder, which is magnesium oxide. Oxygen and Magnesium combine in a chemical reaction to form this compound. The ribbon burns with a blinding white flame.

14. Reaction of Iron with Oxygen Practical Investigation What was the colour of the flame of the burning magnesium? A: Blinding white light What is the colour of the product formed? Name the product formed? Write a balanced chemical reaction for the reaction between iron and oxygen. 1. 2. 3. 4. A: white A: Magnesium oxide A: 2Mg + O 2 2MgO