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

//Multiple Choice

What does a Lewis dot structure represent? {
    ~Number of neutrons in an atom
    =Valence electrons and bonding
    ~Atomic mass
    ~Total electrons in an atom
}

How many covalent bonds are present in a water molecule (H₂O)? {
    ~1
    =2
    ~3
    ~4
}

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

What is the bond angle in a water molecule (H₂O)? {
    ~90°
    =104.5°
    ~109.5°
    ~120°
}

How many double bonds are present in a carbon dioxide (CO₂) molecule? {
    ~1
    =2
    ~3
    ~4
}

What is the total number of valence electrons used in the Lewis dot structure of CO₂? {
    ~12
    =16
    ~18
    ~20
}

What type of covalent bond exists between the carbon and oxygen atoms in CO₂? {
    ~Single bond
    =Double bond
    ~Triple bond
    ~Ionic bond
}

In the Lewis dot structure of H₂O, how many lone pairs are shown in total? {
    ~2
    =4
    ~6
    ~8
}

What is the shape of the CO₂ molecule based on its Lewis structure? {
    =Linear
    ~Bent
    ~Trigonal planar
    ~Tetrahedral
}

Which of the following correctly represents the Lewis dot structure of a water molecule? {
    ~O with one single bond to each H and no lone pairs
    =O with one single bond to each H and two lone pairs
    ~O with one double bond to each H and no lone pairs
    ~O with one double bond to each H and two lone pairs
}

//True or False

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

Carbon dioxide (CO₂) has a bent structure. {F}

In the Lewis dot structure of water (H₂O), oxygen has two lone pairs of electrons. {T}

A double bond involves the sharing of four electrons between two atoms. {T}

Hydrogen follows the octet rule in covalent bonding. {F}

Carbon forms two double bonds in a molecule of CO₂. {T}

The bond angle in a water molecule (H₂O) is 180°. {F}

In the Lewis structure of CO₂, there are no lone pairs on the carbon atom. {T}

Covalent bonds are usually formed between metals and non-metals. {F}

The total number of valence electrons in a water molecule (H₂O) is 8. {T}

//Fill in the blanks

In a water molecule (H₂O), the oxygen atom forms ______ covalent bonds. {
    ~1
    =2
    ~3
    ~4
}

In the Lewis dot structure of CO₂, each oxygen atom forms ______ covalent bonds with the carbon atom. {
    ~1
    =2
    ~3
    ~4
}

The Lewis dot structure of a water molecule (H₂O) shows ______ lone pairs on the oxygen atom. {
    ~1
    =2
    ~3
    ~4
}

The shape of a CO₂ molecule is ______. {
    =Linear
    ~Bent
    ~Tetrahedral
    ~Trigonal planar
}

The total number of valence electrons used in the Lewis dot structure of H₂O is ______. {
    ~6
    =8
    ~10
    ~12
}

In the Lewis dot structure of CO₂, the total number of shared electrons is ______. {
    ~2
    ~4
    =8
    ~16
}

The bond angle in a water molecule (H₂O) is approximately ______ degrees. {
    ~90°
    =104.5°
    ~109.5°
    ~120°
}

The number of lone pairs on the oxygen atom in CO₂ is ______. {
    =0
    ~1
    ~2
    ~4
}

The total number of covalent bonds in a CO₂ molecule is ______. {
    ~2
    ~3
    =4
    ~5
}

The Lewis dot structure of H₂O satisfies the ______ rule for hydrogen atoms. {
    =Duplet
    ~Octet
    ~Triple
    ~Hexet
}

//Numericals

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

How many covalent bonds are present in a molecule of water (H₂O)? {
    ~1
    =2
    ~3
    ~4
}

How many valence electrons are used in the Lewis dot structure of CO₂? {
    ~12
    ~14
    =16
    ~18
}

What is the total number of shared electrons in a CO₂ molecule? {
    ~2
    ~4
    =8
    ~16
}

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

What is the bond angle in a water molecule (H₂O)? {
    ~90°
    =104.5°
    ~109.5°
    ~120°
}

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

How many double bonds are present in a carbon dioxide (CO₂) molecule? {
    ~1
    =2
    ~3
    ~4
}

How many electrons does hydrogen share to form a covalent bond in H₂O? {
    =1
    ~2
    ~3
    ~4
}

What is the total number of valence electrons in a molecule of methane (CH₄)? {
    ~6
    =8
    ~10
    ~12
}

//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Water H2O -> Bent structure
=Carbondioxide CO2 -> Linear structure 
=Oxygen in H2O -> Two lone pairs
=Carbon in CO2 -> Forms two double bonds
}


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