A2: Period 3 Reactions Flashcards
Magnesium is heated with STEAM.
What do you OBSERVE and write the EQUATION
WHITE powder
WHITE light
Mg + H2O → MgO + H2
Why does MAGNESIUM have a HIGHER melting point than SODIUM?
Magnesium ion (Mg2+) has higher charge than Na+
Metallic Bonding STRONGER
takes more energy to lose 2 electrons (Mg2+) than it does to lose one (Na+)
Silicon Dioxide…
Structure and Bonding and PHYSICAL PROPERTIES of it
Giant Covalent
Bonding: Covalent
HARD and INSOLUBLE
Phosphorus(V) Oxide;
Formula, Structure and Bonding? (4 marks)
P4 O10
MOLECULAR
Covalent
Dipole - Dipole forces BETWEEN MOLECULES
Magnesium OXIDE; what type of Bonding is it?
ionic!!! There are 2 I’s in Magnesium Oxide!
MagnesIum OxIde
Outline an experiment to demonstrate that magnesium oxide has ionic bonding:
MELT IT
MOLTEN OXIDE conducts electricity
LEARN THIS!!!
Why is SILICON DIOXIDE…INSOLUBLE…in water?
Giant Covalent structure
Water CAN’T supply enough energy to break the COVALENT bonds
Sodium with Water forms?
pH of it?
Observations?
2NaOH ➕ H2
ph: 12-14
formation of molten ball on surface and FIZZING
Magnesium reacts with WATER to produce?
pH of it?
Mg(OH)2 ➕ H2
ph: 9 - 10
Does Magnesium dissolve in water?
NO‼️‼️‼️
it is SPARINGLY soluble, hence,
NOT TOXIC
What’s the formula for Phosphorous Acid⁉️
H3⃣ PO4⃣
COLOUR of Na FLAME and what type of REACTION is it in AIR?
- Yellow 🔥
* Vigorous
COLOUR of Mg FLAME and what type of REACTION is it in AIR?
- Brilliant White
* Vigorous
What type of REACTION is it in AIR with Al ?
• Slow
What type of REACTION is it in AIR with Si ?
• Slow
COLOUR of P FLAME and what type of REACTION is it in AIR?
- Brilliant White
* SPONTANEOUSLY COMBUSTS 💨
COLOUR of S FLAME and what type of REACTION is it in AIR?
- Blue as in Sea is Blue 🌊
* Burns Steadily
Why does Al2O3 have a lower MP than expected?
bcos the 3+ ions DISTORT the OXYGEN’s electron cloud ☁️ to make the bonds partially covalent
Which are the Simple Covalent OXIDES and what are their pH’s?
H3 PO4
H2SO3 and H2SO4
pH: 0-2
Usually, S + O2 ➡️ SO2
BUT, what’s required to make SO3?
- HIGH temperature 🔥
* 🐱 CATALYST
Define the term “Amphoteric” and gave an example
it can act as an acid OR base
Al203
Silicon Dioxide is classed as _____ because it reacts with _____ to form _____
- ACIDIC
- BASES
- SALTS
Sodium Oxide with HCL —> ?
2NaCL + H20
Magnesium Oxide with Sulfuric Acid —> ?
MgSO4 + H20
Aluminium Oxide with Sodium Hydroxide AND WATER —> ?
2NaAL(OH)4
Aluminium Oxide with Sulfuric Acid —> ?
Al2(S04)3 + 3H20
Silicon Dioxide with Sodium Hydroxide —> ?
Na2SiO3 + H20
Phosphorus Oxide with Sodium Hydroxide
—> ?
4Na3PO4 + 6H20
Sulfur Dioxide with Sodium Hydroxide —>
Na2SO3 + H20
Sulfur Trioxide with Sodium Hydroxide —>
Na2SO4 + H20
