Bulk & Surface Properties (AQA GCSE Chemistry)
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What are the three categories of particles based on their diameter?
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What are the three categories of particles based on their diameter?
The three categories of particles based on their diameter are:
Coarse particles (dust)
Fine particles
Nanoparticles.
What does PM stand for in PM2.5 and PM10?
PM stands for Particulate Matter.
True or False?
Nanoparticles are between 1 and 100 micrometres in size.
False.
Nanoparticles are between 1 and 100 nanometres in size.
What is the size range of fine particles in nanometres?
Fine particles have diameters between 100 and 2500 nm.
True or False?
Nanoparticles usually contain only a few hundred atoms.
True.
Nanoparticles usually contain only a few hundred atoms.
True or False?
Coarse particles (PM10) have diameters between 1 x 10-5 m and 2.5 x 10-6 m.
True.
Coarse particles (PM10) have diameters between 1 x 10-5 m and 2.5 x 10-6 m.
What is the size of atoms and simple molecules compared to nanoparticles?
Atoms and simple molecules are around 100 times smaller than nanoparticles.
Calculate the surface area in cm2.
The surface area is:
3 x 3 x 6 = 54 cm2
Calculate the volume in cm3.
The surface area is:
3 x 3 x 3 = 27 cm3
A particle has a surface area of 24 cm2 and a volume of 8 cm3. What is the surface area to volume ratio?
The surface area to volume ratio in 3:1.
True or False?
As particles decrease in size, their surface area decreases in relation to their volume.
False.
As particles decrease in size, their surface area increases in relation to their volume.
Why do nanoparticles have different properties to the bulk material?
Nanoparticles have different properties to the bulk material because they have a higher surface area to volume ratio.
How are fullerenes used in medicine?
Fullerenes are used in medicine and drug design as they are more easily absorbed than other particles and can deliver drugs to target areas more effectively.
What is a potential risk of nanoparticles in medical applications?
A potential risk of nanoparticles in medical applications could be:
A small amount of toxicity would be multiplied due to the high surface area to volume ratio.
They are not easily disposed of by the body.
True or False?
The main industrial application of nanoparticles is in catalysis due to their high surface area to volume ratios.
True.
The main industrial application of nanoparticles is in catalysis due to their high surface area to volume ratios.
True or False?
Nanoparticles are easily disposed of by the body.
False.
Nanoparticles are not easily disposed of by the body, which is a cause for caution in their medical application.
How does titanium dioxide nanoparticle behave differently from its bulk form in sunscreens?
Titanium dioxide nanoparticles in sunscreens block UV light but leave no white marks on the skin.
Why is 1 g of nanoparticles is a better catalyst than 1 g of cobalt oxide powder?
Nanoparticles are much smaller than coarse particles, so they have a higher surface area to volume ratio.
True or False?
It is cheaper to use nanoparticles of platinum as opposed to coarse particles of platinum.
True.
It is cheaper to use nanoparticles of platinum as opposed to coarse particles of platinum.
Nanoparticles have a larger surface area to volume ratio, so less particles can be used to achieve the same effect.
