organic chem

after this topic i am going to organically decompose

What is a nanoparticle?

A nanoparticle is a structure, often spherical, with a diameter between 1 and 100 nanometres (nm) and usually contains a few hundred atoms.

What is a nanomaterial?

A nanomaterial is a substance made up of nanoparticles and typically contains a few thousand atoms.

What is a bulk material?

A bulk material is a substance made up of millions or more atoms.

What are the key properties of nanoparticles?

Nanoparticles are extremely small, have a large surface area to volume ratio, and have physical and chemical properties that vary depending on their size.

What is meant by a large surface area to volume ratio and why is it important?

Nanoparticles have a greater proportion of atoms on their surface compared to bulk materials.

This gives them more contact with surrounding substances, increasing reactivity and making them effective catalysts.

Why are nanoparticles effective catalysts?

The large surface area to volume ratio means more active sites are available for reactions.

This allows more reactant particles to collide with the catalyst surface at once, increasing reaction rates and reducing the amount of catalyst needed.

Why are nanoparticles generally more reactive than bulk materials?

A much greater proportion of their atoms are exposed on the surface and available to participate in chemical reactions.

Why do the properties of nanoparticles depend on size?

Changing the size of a nanoparticle changes the proportion of atoms on the surface, which affects properties such as colour, reactivity, conductivity, strength and melting point.

Why do bulk materials have relatively constant properties?

In bulk materials, only a very small proportion of atoms are on the surface, so changing the size has little effect on physical and chemical properties.

Gold nanoparticles

bulk gold appears yellow

gold nanoparticles appear red or purple

explanation: nanoparticles interact with light differently from bulk materials, causing a change in colour.

How can the strength and conductivity of nanomaterials differ from bulk materials?

Nanomaterials are often stronger due to their highly organised structure and fewer defects.

Their electrical and thermal conductivity may also change depending on particle size and structure.

What are carbon nanotubes?

Carbon nanotubes are cylindrical nanostructures made entirely of carbon atoms.

They are extremely strong, lightweight and good electrical conductors.

Potential uses include electronics and high-strength materials.

What are some medical uses of nanomaterials?

Drug delivery, targeted cancer treatments and protecting implanted cells from damage.

How are nanomaterials used in water purification?

Their large surface area allows them to remove contaminants from water more efficiently.

How are nanomaterials used in electronics?

Their unique electrical properties can improve the performance of electronic devices and circuits.

What are some current and potential uses of nanomaterials?

Drug delivery, cancer treatments, protecting implanted cells, water purification, electronics, catalysts and advanced high-strength materials.

What are the concerns associated with nanomaterials?

Scientists do not yet fully understand their effects on human health and the environment.

Explain why the size of a nanoparticle dictates the physical properties of a nanomaterial while bulk materials have constant physical properties regardless of size.

Nanoparticles have a very large surface area to volume ratio, meaning a high proportion of atoms are on the surface.

As particle size changes, the proportion of surface atoms changes, affecting properties such as colour, reactivity, conductivity and melting point.

In bulk materials, the proportion of surface atoms remains very small regardless of size, so physical properties remain essentially constant.

Diamond: Structure and bonding

Each carbon atom is covalently bonded to 4 other carbon atoms in a giant three-dimensional tetrahedral lattice.

Diamond: Properties

Extremely hard

very high melting point (~4027°C)

high refractive index so it sparkles, and does not conduct electricity because all electrons are used in bonding.

Diamond: Uses

Drill bits and cutting tools (extreme hardness); jewellery (high refractive index and sparkle).

Graphite: Structure and bonding

Graphite consists of flat layers of hexagonal rings.

Each carbon atom is bonded to 3 other carbon atoms, leaving 1 delocalised electron.

Weak forces exist between the layers.

Graphite: Properties

Conducts electricity because of delocalised electrons

soft and slippery because layers can slide over one another

and has a very high melting point (~3600°C).

Graphite: Uses

Pencil leads (soft layers flake off easily)

nuclear reactor cores (high melting point and thermal stability)

electrodes (conducts electricity).

Graphene: Structure and bonding

Graphene is a single layer of graphite arranged in a hexagonal lattice.

Each carbon atom is bonded to 3 other carbon atoms and has 1 delocalised electron.

Graphene: Properties

Extremely strong

lightweight

flexible

transparent

excellent conductor of electricity and heat due to its delocalised electrons.

Buckminsterfullerene (C₆₀): Structure and bonding

Buckminsterfullerene is a hollow spherical molecule made of 60 carbon atoms arranged into 12 pentagons and 20 hexagons.

Each carbon atom is bonded to 3 other carbon atoms, giving the molecule the shape of a soccer ball ("buckyball").

Buckminsterfullerene (C₆₀): Properties

Contains delocalised electrons so it can conduct electricity

has a relatively low melting point because molecules are held together by weak intermolecular forces

has a hollow structure.

Buckminsterfullerene (C₆₀): Uses

Drug delivery (hollow structure can carry molecules)

nanotechnology applications (small size and conductivity).

Why does diamond not conduct electricity while graphite, graphene, fullerenes and carbon nanotubes do?

In diamond, all 4 valence electrons are used for covalent bonding so there are no delocalised electrons.

In graphite, graphene, fullerenes and nanotubes, each carbon atom has 1 delocalised electron that can move and carry electrical charge.

Alkanes

Hydrocarbons that contain only carbon-carbon single bonds.

Alkanes are saturated compounds, meaning each carbon atom forms the maximum possible number of single bonds and no carbon-carbon double or triple bonds are present.

They have the general formula CₙH₂ₙ₊₂ and their names end in -ane.

Alkyl Groups (Side Chains)

An alkyl group is a branch attached to the parent carbon chain.

Alkyl names are formed by replacing -ane with -yl.

Examples: methane → methyl, ethane → ethyl.

IUPAC Rules for Naming

• Choose the longest continuous carbon chain as the parent chain.

• Number the chain from the end closest to the first branch.

• Name each branch using its alkyl name.

• Include the branch position number.

• List branches in alphabetical order.

Haloalkanes

Halogens (chlorine, bromine, fluorine and iodine) can replace one more more hydrogen atoms in an alkane to form a haloalkane