Reactions of Metals and Oxygen

• Science
• Secondary Education
• Age 12,13

Reaction of Metals and Oxygen

Lesson 3

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Extension: Advance Reading 2

• Reaction of Metals with Water
• pages 282  to 285
• Short test tomorrow in LessonUp

Recall of the previous lesson

• Exothermic reaction:

- heat is released to the outside to make chemical bonds and form NEW products

- the product becomes warmer 

- there is an increase in temperature

Recall of the previous lesson

• Endothermic reaction:

- heat is absorbed from the outside to break the chemical bonds to form NEW products

- the product becomes cooler 

- there is a decrease in temperature

Recall of the previous lesson

• Reaction vs Process

- REACTION : happens when substances (reactants) react with each other and NEW products are formed

- PROCESS : happens when substances are dissolved, or changes from solid to liquid or liquid to gas, and NO NEW products are formed

Reaction or Process?

potassium chloride + water           potassium chloride solution 

Reaction or Process?

potassium chloride + water           potassium chloride solution 

Process (Endothermic)

Reaction or Process?

potassium + water              potassium hydroxide + hydrogen gas

Reaction or Process?

potassium + water              potassium hydroxide + hydrogen gas

Reaction (Exothermic)

Reaction or Process?

solid water + heat              liquid water

Reaction or Process?

solid water + heat              liquid water

Process (Endothermic)

Reaction or Process?

water vapor + low temperature         liquid water

Reaction or Process?

water vapor + low temperature         liquid water

Process (Exothermic)

Reaction of Metals and Oxygen

Lesson 3

Many metals react with _______ if they get hot enough.

1. oxygen
2. nitrogen
3. hydrogen
4. calcium

Magnesium is _____ reactive than iron because it reacts more quickly than iron.

1. less
2. more
3. not
4. a little

The reaction between a metal and oxygen is called __________ reaction.

1. hydration
2. endothermic
3. oxidation
4. process

metal + oxygen -> ___________

1. metal oxygen
2. metal oxide
3. water
4. nothing

Potassium, sodium, and calcium can react with oxygen without even being _______.

1. moist
2. heated
3. sliced
4. cooled

Some metals like ________ DO NOT react with oxygen. They are generally unreactive or ___________.

1. inert
2. inactive

Silver reacts _________ with oxygen in air. If a silver object is NOT cleaned, it goes black over time.

1. quickly
2. slowly

Reaction of Metals and Oxygen

Lesson 3

What can you say about this picture? Anything familiar?

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Rusting (Chemical Equation)

iron + oxygen -> _______

Rusting (Chemical Equation)

iron + oxygen -> _______

iron oxide

Rusting (Chemical Equation)

iron + oxygen -> _______

iron oxide

Water is ALSO needed to make this reaction possible.

Is rusting very useful?

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Reaction of Metals and Oxygen

Lesson 3

Which of the following DOES NOT PROTECT the iron from rusting?

1. applying paint
2. cover it with zinc
3. galvanize it
4. washing it with water

What 2 things have you learned today?

Rate your understanding of the lesson.

15

Extension: Advance Reading 2

• Reaction of Metals with Water
• pages 282  to 285
• Short test tomorrow in LessonUp