Period 3 Elements And Reactions With Oxygen Flashcards
(27 cards)
What type of metals are sodium, magnesium and aluminium?
Metallic
What are the properties of sodium, magnesium and aluminium?
- they are shiny - when freshly exposed to air
- they conduct electricity
- they react with dilute acids to give hydrogen and salts
What type of metal is silicon?
Semi-metal (metalloid)
What are the properties of silicon?
Conducts electricity to some extent
Useful in making semiconductor devices
What type of elements are phosphorus, sulfur and chlorine?
Non-metals
What are the properties of phosphorus, sulfur and chlorine?
Do not conduct electricity
Low melting and boiling points
What type of element is argon?
Noble gas
What are the properties of argon?
Chemically unreactive
Exists as separate atoms
What reactions are period 3 elements involved in?
Redox reactions
What is an oxidation state of an element?
Zero ( 0 )
Describe what happens to the oxidation states of period 3 elements once they’ve reacted
Ends up with a positive or negative oxidation state
Which two elements in period 3 that can react with cold water?
Sodium and Magnesium
What is the non-metal in period 3 that reacts with water?
Chlorine
Describe the reaction of sodium with water
Its vigorous
What are observations made when sodium reacts with water?
Floats on the surface of the water and fizzes rapidly
Melting - due to heat energy released by reaction
What is produced when sodium reacts with water?
Strongly alkaline solution of sodium hydroxide is formed
(pH 13-14)
Describe the reaction when magnesium reacts with water
Reaction is very slow at room temperature
What are observations made when magnesium reacts with water?
Only a few bubbles of hydrogen are formed after some days
What is the product formed when magnesium reacts with water?
Why is it less alkaline than when sodium reacts with water?
Resulting solution is less alkaline than in the case of sodium
As Magnesium Hydroxide is only sparingly soluble (pH around 10)
Which elements in Period 3 react with oxygen?
All elements in period 3 (except for argon)
- they are relatively reactive
How are oxides prepared?
By direct reaction of the element with oxygen
What type of reaction is shown when period 3 elements react with oxygen?
Exothermic reactions
What are observations made when sodium reacts with oxygen?
Sodium burns brightly in air
With yellow flame
To for white sodium oxide
What observations are made when magnesium reacts with oxygen?
Burns in air with a bright white flame
White powder produced that is magnesium oxide
