An alkane is a saturated hydrocarbon with the general formula C n H 2n+2 . All carbon-carbon bonds in alkanes are single bonds (C-C).

Why are alkanes described as generally unreactive compounds?

Alkanes are generally unreactive because they contain only strong single covalent bonds (C-C and C-H). These bonds require a lot of energy to break, making alkanes resistant to most chemical reactions.

The general formula of the alkanes is .......... , where n is the number of carbon atoms.

The general formula of the alkanes is C n H 2n+2 , where n is the number of carbon atoms.

True or False? Methane has the molecular formula CH 6 .

False. Methane has the molecular formula CH 4 . It is the first alkane and follows the general formula C n H 2n+2 with n = 1.

What are the products of the complete combustion of an alkane?

Complete combustion of an alkane produces carbon dioxide and water . For example: CH 4 (g) + 2O 2 (g) → CO 2 (g) + 2H 2 O (l)

Give the names and molecular formulae of the first four alkanes.

Methane : CH 4 Ethane : C 2 H 6 Propane : C 3 H 8 Butane : C 4 H 10

True or False? Alkanes contain covalent bonds because they are made of non-metal atoms.

True. Alkanes are made entirely of carbon and hydrogen atoms, which are both non-metals . Non-metal atoms form covalent bonds by sharing electrons.

Complete combustion of propane produces .......... and .......... : C 3 H 8 + 5O 2 → .......... .

Complete combustion of propane produces carbon dioxide and water : C 3 H 8 + 5O 2 → 3CO 2 + 4H 2 O .

How does the boiling point change as alkane chain length increases, and why?

Boiling point increases with chain length. Longer alkane molecules have stronger intermolecular forces between them, so more energy is needed to separate the molecules.

IGCSEScienceCambridge (CIE)Combined ScienceChemistryFlashcards11. Organic ChemistryAlkanes

Alkanes (Cambridge (CIE) IGCSE Combined Science: Chemistry): Flashcards

Exam code: 0653

1/9

0Still learning

Know0

FrontAlkanes
Define alkane.

Was this flashcard helpful?

Cards in this collection (9)

Define alkane.
An alkane is a saturated hydrocarbon with the general formula C_nH_2n+2. All carbon-carbon bonds in alkanes are single bonds (C-C).
Why are alkanes described as generally unreactive compounds?
Alkanes are generally unreactive because they contain only strong single covalent bonds (C-C and C-H). These bonds require a lot of energy to break, making alkanes resistant to most chemical reactions.
The general formula of the alkanes is .........., where n is the number of carbon atoms.
The general formula of the alkanes is C_nH_2n+2, where n is the number of carbon atoms.
True or False?
Methane has the molecular formula CH₆.
False.
Methane has the molecular formula CH₄. It is the first alkane and follows the general formula C_nH_2n+2 with n = 1.
What are the products of the complete combustion of an alkane?
Complete combustion of an alkane produces carbon dioxide and water. For example: CH₄ (g) + 2O₂ (g) → CO₂ (g) + 2H₂O (l)
Give the names and molecular formulae of the first four alkanes.
1. Methane: CH₄
2. Ethane: C₂H₆
3. Propane: C₃H₈
4. Butane: C₄H₁₀
True or False?
Alkanes contain covalent bonds because they are made of non-metal atoms.
True.
Alkanes are made entirely of carbon and hydrogen atoms, which are both non-metals. Non-metal atoms form covalent bonds by sharing electrons.
Complete combustion of propane produces .......... and .......... : C₃H₈ + 5O₂ → ...........
Complete combustion of propane produces carbon dioxide and water: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.
How does the boiling point change as alkane chain length increases, and why?
Boiling point increases with chain length. Longer alkane molecules have stronger intermolecular forces between them, so more energy is needed to separate the molecules.

Sign up to unlock flashcards

By signing up you agree to our Terms and Privacy Policy

Previous:FuelsNext:Alkenes