Intro to Org Chem

Presentation

•

Chemistry

•

10th Grade

•

Practice Problem

•

Hard

•

NGSS

HS-LS1-6

Standards-aligned

Leong Yew Sheng Nicholas

Used 8+ times

FREE Resource

6 Slides • 7 Questions

Intro to Org Chem

Test, Write, Apply

Multiple Choice

What does hydrocarbon consist of?

hydrogen atoms and carbon atoms

hydrogen ions and carbon ions

water molecules and carbon atoms

Multiple Select

Which statement accurately describes a homologous series?

(You may choose more than 1 answer.)

undergoes similar chemical reactions

different functional group

same general formula

same physical properties

Multiple Select

Select the true statements for the gradual change in physical properties of a homologous series as the number of carbon atoms increases

Flammability increases

Melting/Boiling points increases

Viscosity increases

Density increases

Gradual Change in Physical Properties

When number of carbon atoms increases -> bigger size of molecules
1. Flammability decreases (Harder to combust, smokier flame)
2. Melting/Boiling Points increases
3. Viscosity increases (harder for liquid to flow)
4. Increase in density (more atoms in each molecule)

Multiple Select

Comparing the structures of alkanes and alkene, how are they similar?

same general formula

identical naming prefix

(eth-, prop-, but-...)

contained carbon-carbon double bond

same functional group

they are hydrocarbons

Alkane & Alkene

They are hydrocarbons (contained hydrogen and carbon atoms).
They have the same naming system according to the number of carbon atoms.

Multiple Select

Comparing the structures of alkanes and alkene, how are they different?

different general formula

identical naming prefix

(eth-, prop-, but-...)

alkene contained carbon-carbon double bond while alkane does not have.

same functional group

they are hydrocarbons

Alkane Vs Alkene

1. Different General Formula: Alkane - C_nH_2n+2VS Alkene - C_nH_2n
2. Different functional group: Alkene - carbon-carbon double bond

Petroleum

Mixtures of hydrocarbons
(mainly alkanes)
How do we separate the different fractions of petroleum?

Open Ended

What is a petroleum?

Type response here

Multiple Choice

Since petroleum is a mixture of hydrocarbons of different boiling points, we can use ____________ to separate the fractions.

simple distillation

filtration

crystallisation

fractional distillation

Fraction Distillation

1. Heat in furnace to form vapours
2. Vapours pass through fractionating tower
3. Petroleum gas is collected at the top of the tower
4. The other vapours cool and condense at the same time at different levels of the tower
5. The one with lower boiling points are collected at the top while the one with higher boiling points are collected at the bottom

Intro to Org Chem

Test, Write, Apply

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