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

//Multiple Choice

Which of the following metals reacts vigorously with cold water?
{
= Sodium
~ Gold
~ Copper
~ Silver
}

When magnesium reacts with hot water, it produces\:
{
= Magnesium hydroxide and hydrogen
~ Magnesium oxide and oxygen
~ Magnesium carbonate and carbon dioxide
~ Magnesium chloride and chlorine
}

Which of the following metals does not react with water under any condition?
{
~ Aluminum
~ Potassium
= Copper
~ Sodium
}

The gas released when a metal reacts with water is\:
{
~ Oxygen
= Hydrogen
~ Carbon dioxide
~ Nitrogen
}

What is the nature of the solution formed when calcium reacts with water?
{
~ Acidic
~ Neutral
= Basic
~ Amphoteric
}

//True or False

Sodium reacts explosively with cold water. {T}

Gold reacts with water at room temperature to release hydrogen gas. {F}

Magnesium reacts with boiling water but not with cold water. {T}

Hydrogen gas burns with a pop sound when tested with a burning matchstick. {T}

Calcium reacts with water to form an acidic solution. {F}

//Fill in the blanks

Sodium reacts with cold water to form __________.
{
= Sodium hydroxide and hydrogen
~ Sodium oxide and oxygen
~ Sodium chloride and water
}

Potassium reacts with water more __________ than sodium.
{
~ Slowly
= Vigorously
~ Weakly
}

Metals like __________ do not react with water at all.
{
= Gold and silver
~ Zinc and aluminum
~ Potassium and calcium
}

The reaction of aluminum with water is usually prevented by its __________.
{
~ High reactivity
= Oxide layer
~ Low density
}

Magnesium reacts with __________ water to produce hydrogen gas.
{
~ Cold
= Hot
~ Boiling
}


//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Sodium + Cold Water -> Sodium hydroxide + Hydrogen
=Magnesium + Boiling Water -> Magnesium hydroxide + Hydrogen
=Calcium + Water -> Calcium hydroxide + Hydrogen
=Gold + Water -> No reaction
=Potassium + Water -> Vigorous reaction + Heat + Hydrogen
}


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