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

//Multiple Choice

What is a covalent bond? {
    ~Transfer of electrons
    =Sharing of electrons
    ~Sharing of protons
    ~Sharing of neutrons
}

What type of bond is present in a chlorine molecule (Cl₂)? {
    =Single covalent bond
    ~Double covalent bond
    ~Triple covalent bond
    ~None of the above
}

How many covalent bonds are present in an oxygen molecule (O₂)? {
    ~One
    =Two
    ~Three
    ~Four
}

What type of bond is formed in a nitrogen molecule (N₂)? {
    ~Single covalent bond
    ~Double covalent bond
    =Triple covalent bond
    ~Ionic bond
}

Why does hydrogen form a single covalent bond? {
    ~To complete its octet
    =To complete its duplet
    ~To lose electrons
    ~To gain electrons
}

Which of the following molecules contains a double bond? {
    ~H₂
    =O₂
    ~N₂
    ~Cl₂
}

What is the maximum number of covalent bonds nitrogen can form? {
    ~One
    ~Two
    =Three
    ~Four
}

In a covalent bond, the electrons are shared between\: {
    ~Metals
    =Non-metals
    ~Metal and non-metal
    ~Any two elements
}

Which of the following molecules has a single covalent bond? {
    ~Oxygen (O₂)
    ~Nitrogen (N₂)
    =Chlorine (Cl₂)
    ~Carbon dioxide (CO₂)
}

What is the shape of a water molecule due to covalent bonding? {
    ~Linear
    ~Tetrahedral
    =Bent or angular
    ~All of the above
}

//True or False

A covalent bond is formed by the transfer of electrons. {F}

A single covalent bond involves the sharing of two electrons. {T}

Nitrogen (N₂) forms a double covalent bond. {F}

Oxygen (O₂) has a double covalent bond between its atoms. {T}

Covalent bonds are usually formed between non-metallic elements. {T}

Hydrogen (H₂) follows the octet rule. {F}

Carbon can form up to four covalent bonds in a molecule. {T}

Water (H₂O) has a linear structure due to covalent bonding. {F}

Covalent bonds are stronger than ionic bonds. {F}

In a covalent bond, electrons are shared to achieve a stable electronic configuration. {T}

//Fill in the blanks

A covalent bond is formed by the ______ of electrons between atoms. {
    ~Transfer
    =Sharing
    ~Loss
    ~Gain
}

A molecule of oxygen (O₂) contains a ______ covalent bond. {
    ~Single
    =Double
    ~Triple
    ~Quadruple
}

Nitrogen (N₂) forms a ______ covalent bond. {
    ~Single
    ~Double
    =Triple
    ~Quadruple
}

In a molecule of chlorine (Cl₂), each atom shares ______ electron(s). {
    =One
    ~Two
    ~Three
    ~Four
}

Covalent bonds are usually formed between ______ elements. {
    ~Metallic
    =Non-metallic
    ~Metalloids
    ~Noble gases
}

The covalent bond in hydrogen (H₂) completes its ______ configuration. {
    =Duplet
    ~Octet
    ~Triplet
    ~Hexet
}

The sharing of ______ electrons forms a covalent bond. {
    =Valence
    ~Core
    ~Inner-shell
    ~All
}

The bond angle in a water molecule is approximately ______ degrees due to covalent bonding. {
    ~90°
    =104.5°
    ~120°
    ~180°
}

Carbon forms ______ covalent bonds in methane (CH₄). {
    ~One
    ~Two
    ~Three
    =Four
}

In covalent bonding, the bond strength increases as the number of shared electron pairs ______. {
    =Increases
    ~Decreases
    ~Remains constant
    ~Varies randomly
}

//Numericals

How many electrons are shared in a single covalent bond? {
    ~1
    =2
    ~4
    ~6
}

How many electrons are shared in a triple covalent bond? {
    ~2
    ~4
    =6
    ~8
}

What is the total number of valence electrons in a water molecule (H₂O)? {
    ~6
    =8
    ~10
    ~12
}

How many covalent bonds are present in a molecule of methane (CH₄)? {
    ~2
    ~3
    =4
    ~5
}

How many shared pairs of electrons are there in a molecule of oxygen (O₂)? {
    ~1
    =2
    ~3
    ~4
}

What is the bond angle in a methane (CH₄) molecule? {
    ~90°
    ~104.5°
    =109.5°
    ~120°
}

What is the total number of electrons shared in a nitrogen molecule (N₂)? {
    ~2
    ~4
    =6
    ~8
}

How many valence electrons does a carbon atom share in a molecule of ethene (C₂H₄)? {
    ~2
    ~4
    =6
    ~8
}

What is the molecular formula of a compound with 2 carbon atoms and 6 hydrogen atoms, all bonded covalently? {
    ~C₂H₂
    ~C₂H₄
    =C₂H₆
    ~C₂H₈
}

How many lone pairs of electrons are present on the oxygen atom in a water molecule (H₂O)? {
    ~1
    =2
    ~3
    ~4
}

//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Chlorine (Cl2) -> Single Bond 
=Oxygen (O2) -> Double Bond 
=Nitrogen (N2) -> Triple Bond 
=Hydrogen (H2) -> Duplet rule 
}


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