$CATEGORY: Science - Khan Academy/1.Chemical Reactions and Equations/1.Chemical Reactions and Equations--Types of Chemical Reactions

//Multiple Choice

What happens in a displacement reaction? {
    ~A less reactive element displaces a more reactive one.
    =A more reactive element displaces a less reactive one.
    ~A reactive element combines with another element.
    ~Elements react with heat.
}

In the general displacement reaction equation A+BC\=AC+B, what does B represent? {
    ~The more reactive element.
    =The less reactive element.
    ~The compound formed.
    ~The product.
}

What is formed when iron reacts with copper sulphate? {
    ~Copper sulphate and iron.
    ~Zinc sulphate and copper.
    =Iron sulphate and copper.
    ~Iron chloride and copper.
}

What happens when copper reacts with iron sulphate? {
    ~Copper displaces iron.
    =No reaction occurs.
    ~Copper forms iron sulphate.
    ~Iron displaces copper.
}

In the mnemonic "Please stop calling me a careless zebra, instead try learning how copper saves gold," what does the "P" represent? {
    =Potassium
    ~Phosphorus
    ~Palladium
    ~Platinum
}

What does the reactivity series help determine in displacement reactions? {
    ~The mass of the element.
    ~The temperature required for the reaction.
    =Which element can displace another.
    ~The colour of the product.
}

What product is formed when zinc displaces copper from copper sulphate? {
    ~Zinc chloride and copper.
    =Zinc sulphate and copper.
    ~Zinc oxide and copper.
    ~Zinc nitrate and copper.
}

In which type of reaction does a more reactive element displace a less reactive element from a compound? {
    ~Combustion reaction.
    =Displacement reaction.
    ~Decomposition reaction.
    ~Synthesis reaction.
}

What happens when magnesium reacts with hydrogen chloride according to the reactivity series? {
    =Magnesium displaces hydrogen.
    ~Magnesium cannot displace hydrogen.
    ~Hydrogen displaces magnesium.
    ~No reaction occurs.
}

Which element in the reactivity series is the least reactive? {
    ~Sodium
    ~Calcium
    =Gold
    ~Iron
}

//True or False

The more reactive element in a displacement reaction forms a new compound with the less reactive element. {T}

Copper can displace iron from iron sulphate. {F}

The reactivity series helps us determine which element can displace another from its compound. {T}

Magnesium can displace hydrogen from hydrochloric acid. {T}

Lead is more reactive than copper and can displace copper from its compound. {F}

Copper is less reactive than zinc in the reactivity series. {T}

The mnemonic "Please stop calling me a careless zebra" helps remember the reactivity series. {T}

Magnesium can displace copper from copper sulphate. {T}

Copper can displace zinc from zinc sulphate. {F}

The general formula for a displacement reaction is A+BC→AC+B. {T}


//Fill in the blanks

Copper cannot displace __________ from its sulphate because copper is less reactive than iron. {
    ~copper
    ~zinc
    =iron
    ~lead
}

When zinc reacts with copper sulphate, the products formed are __________ and copper. {
    ~iron sulphate
    =zinc sulphate
    ~lead chloride
    ~calcium sulphate
}

The mnemonic "Please stop calling me a careless zebra, instead try learning how copper saves gold" is used to remember the __________. {
    ~periodic table
    =reactivity series
    ~atomic numbers
    ~types of reactions
}

__________ is more reactive than copper and can displace it from copper sulphate. {
    ~Lead
    =Zinc
    ~Gold
    ~Silver
}

When magnesium reacts with hydrochloric acid, magnesium displaces __________. {
    ~chlorine
    =hydrogen
    ~magnesium
    ~sulphate
}

The reactivity series lists metals in order of their __________. {
    ~atomic number
    =reactivity
    ~mass
    ~size
}

In a displacement reaction, the less reactive element is __________ from its compound. {
    ~added
    =replaced
    ~removed
    ~formed
}

The reactivity series helps predict which metals can __________ other metals from their compounds. {
    ~bond with
    =displace
    ~dissolve
    ~combine
}

The mnemonic "Please stop calling me a careless zebra" helps remember elements such as potassium, sodium, and __________. {
    =calcium
    ~copper
    ~hydrogen
    ~magnesium
}

__________ is used to extract iron from iron oxide by displacing iron. {
    ~Hydrogen
    ~Zinc
    =Carbon
    ~Copper
}

Zinc can displace copper from __________. {
    ~copper chloride
    ~copper nitrate
    =copper sulphate
    ~copper oxide
}

//Numericals



//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Magnesium displaces copper -> From CuSO4
=To extract iron from iron oxide -> Carbon is used
=Displacement reaction -> a more reactive element displace a less reactive element
=copper reacting with FeSO4 -> No reaction
=Cal in the mnemonic stands for -> Calcium
}


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