$CATEGORY: Science - Khan Academy/4.Carbon and its Compounds/4.Carbon and its Compounds--Bonding in Carbon-The covalent Bond

//Multiple Choice

Why is carbon considered the building block of life?
{
  ~ It is the most abundant element on Earth.
  = It can form a wide variety of complex compounds.
  ~ It is a metal.
  ~ It is inert.
}

How many valence electrons does a carbon atom have?
{
  ~ 2
  = 4
  ~ 6
  ~ 8
}

The ability of carbon to form long chains and rings is called ________.
{
  = Catenation
  ~ Tetravalency
  ~ Hybridization
  ~ Isomerism
}

Which property of carbon allows it to form stable bonds with other elements?
{
  ~ High reactivity
  = Small atomic size
  ~ Low electronegativity
  ~ Metallic nature
}

Carbon forms how many covalent bonds in a stable compound?
{
  ~ 2
  ~ 3
  = 4
  ~ 6
}

Which of the following is NOT an allotrope of carbon?
{
  ~ Diamond
  ~ Graphite
  ~ Buckminsterfullerene
  = Quartz
}

The hybridization of carbon in methane (CH4) is ________.
{
  ~ \(sp\)
  ~ \(sp^2\)
  = \(sp^3\)
  ~ \(sp^3d\)
}

Which of the following is a property of diamond?
{
  ~ Good conductor of electricity
  ~ Soft and slippery
  = High melting point
  ~ Black in color
}

Carbon compounds are primarily held together by ________ bonds.
{
  ~ Ionic
  ~ Metallic
  = Covalent
  ~ Hydrogen
}

Which property of carbon is responsible for the vast number of organic compounds?
{
  ~ High atomic mass
  ~ High melting point
  = Ability to form multiple bonds
  ~ Ability to lose electrons easily
}

//True or False

Carbon has four valence electrons, which makes it tetravalent. {T}

Carbon can only form single covalent bonds. {F}

Diamond is a good conductor of electricity. {F}

Graphite is a soft and slippery material due to weak van der Waals forces between its layers. {T}

Carbon can form compounds with hydrogen, oxygen, nitrogen, and other elements to create diverse organic molecules. {T}

Carbon dioxide (Co2) is an example of a basic oxide. {F}

Buckminsterfullerene (C60) is an allotrope of carbon with a spherical structure. {T}

Carbon forms ionic bonds in most of its compounds. {F}

The ability of carbon to form long chains and rings is called catenation. {T}

Allotropes of carbon, such as diamond and graphite, have different physical properties due to differences in their bonding and structure. {T}

//Fill in the blanks

Carbon has ________ valence electrons in its outermost shell. {
    ~2
    =4
    ~6
    ~8
}

The ability of carbon to form chains and rings is called ________. {
    ~Hybridization
    =Catenation
    ~Isomerism
    ~Tetravalency
}

The most stable allotrope of carbon under normal conditions is ________. {
    ~Diamond
    =Graphite
    ~Buckminsterfullerene
    ~Charcoal
}

Carbon forms ________ bonds in organic compounds. {
    ~Ionic
    =Covalent
    ~Metallic
    ~Hydrogen
}

The hybridization of carbon in ethene (C2H4) is ________. {
    ~\(sp\) 
    =\(sp^2\)
    ~\(sp^3\)
    ~\(sp^3d\)
}

Diamond is ________ in structure, which makes it the hardest natural substance. {
    ~Layered
    =Crystalline
    ~Amorphous
    ~Metallic
}

Carbon dioxide is a ________ oxide of carbon. {
    ~Basic
    =Acidic
    ~Amphoteric
    ~Neutral
}

The unique ability of carbon to form bonds with other carbon atoms is due to its ________. {
    ~Large atomic size
    =Tetravalency
    ~High reactivity
    ~Low electronegativity
}

The molecular formula of Buckminsterfullerene is ________. {
    =C60
    ~C12
    ~C20
    ~C40
}

Graphite is a good conductor of electricity due to the presence of ________. {
    =Free electrons
    ~Covalent bonds
    ~Ionic bonds
    ~Hydrogen bonds
}

//Numericals

Calculate the number of moles of carbon atoms in 12 g of carbon. (Molar mass of carbon \= 12 g/mol) {
    =1 mole
    ~2 moles
    ~0.5 mole
    ~3 moles
}

How many carbon atoms are there in 1 mole of carbon? {
    ~6.022×10^22
    =6.022×10^23
    ~6.022×10^24
    ~6.022×10^25
}

What is the mass of 0.5 moles of carbon dioxide (Co2)? (Molar mass of Co2\=44 g/mol) {
    =22 g
    ~44 g
    ~11 g
    ~88 g
}

Calculate the number of moles in 24 g of graphite. (Molar mass of carbon \= 12 g/mol) {
    ~1 mole
    =2 moles
    ~3 moles
    ~0.5 mole
}

How many grams of methane (CH4) are present in 2 moles? (Molar mass of CH4\=16 g/mol) {
    ~16 g
    ~32 g
    ~48 g
    =64 g
}

If 1 mole of ethene (C2H4) contains 6.022 × 10^23 molecules, how many carbon atoms are present in 1 mole of ethene? {
    ~6.022×10^23
    =1.204×10^24
    ~3.011×10^23
    ~6.022×10^22
}

The percentage of carbon in methane () is approximately ________. (Molar mass of CH4\=16 g/mol, Carbon \= 12 g/mol) {
    ~25%
    ~50%
    =75%
    ~12%
}

Calculate the number of moles of carbon atoms in 6 g of ethyne (C2H2). (Molar mass of C2H2\= 26  g/mol) {
    ~0.23 moles
    =0.46 moles
    ~0.12 moles
    ~0.69 moles
}

How many grams of carbon dioxide (Co2) are produced when 12 g of carbon reacts completely with oxygen?
Reaction\: C+O2\= CO2 (Molar mass of CO2\=44  g/mol, Carbon \= 12 g/mol) {
    =44 g
    ~22 g
    ~88 g
    ~66 g
}

How many moles of carbon are present in 36 g of glucose (C6H12O6)? (Molar mass of glucose \= 180 g/mol) {
    =0.2 moles
    ~0.6 moles
    ~1.2 moles
    ~0.4 moles
}

//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Diamond -> Hardest natural substance
=Graphite -> Conducts electricity
=Buckminsterfullerene -> Spherical molecules
=Carbondioxide -> Acidic Oxide
}


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