$CATEGORY: Science - Khan Academy/3.Metals and Non-metals/3.Metals and Non-metals--Chemical Properties of metals

//Multiple Choice

What is generally formed when metals react with oxygen?
{
= Oxides
~ Hydroxides
~ Chlorides
~ Sulfates
}

Which of the following metals forms an amphoteric oxide?
{
~ Sodium
= Zinc
~ Copper
~ Silver
}

When magnesium reacts with oxygen, the product is\:
{
= MgO
~ MgCO₃
~ MgCl₂
~ MgSO₄
}

Which metal does not react with oxygen at room temperature?
{
~ Iron
= Gold
~ Magnesium
~ Sodium
}

The chemical formula of rust is\:
{
~ Fe₂O₃
~ FeO
= Fe₂O₃·xH₂O
~ Fe₃O₄
}

//True or False

Sodium reacts vigorously with oxygen to form sodium oxide. {T}

Zinc oxide is an acidic oxide. {F}

Gold reacts with oxygen at high temperatures to form gold oxide. {F}

Magnesium reacts with oxygen to form a basic oxide. {T}

Rusting of iron is an example of a reaction with oxygen. {T}

//Fill in the blanks

When sodium reacts with oxygen, it forms __________.
{
~ Sodium chloride
= Sodium oxide
~ Sodium hydroxide
}

Aluminum forms an oxide layer that __________ the metal from further corrosion.
{
= Protects
~ Destroys
~ Enhances
}

The oxide formed by calcium when it reacts with oxygen is __________.
{
= CaO
~ CaCO₃
~ CaCl₂
}

Magnesium burns in air with a __________ flame to form magnesium oxide.
{
~ Green
= White
~ Blue
}

Amphoteric oxides react with both acids and __________.
{
= Bases
~ Metals
~ Non-metals
}

//Numericals



//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Sodium + Oxygen -> Sodium oxide
=Aluminum + Oxygen -> Protective oxide layer
=Iron + Oxygen + Water -> Rust (hydrated iron oxide)
=Magnesium + Oxygen -> Magnesium oxide
=Zinc + Oxygen -> Zinc oxide (amphoteric)
}


//******** END **********