C2 - Bitezise Flashcards
Give the arrangement of particles in a solid
Very close
Regular pattern
Vibrate around a fixed position
Low energy
Bitesize
Describe the arrangement of particles in a liquid
Close
Randomly arranged
Move around each other
greater energy
Bitesize
Solids have a ___ shape and cannot ___
Solids have a fixed c=shape and cannot flow
Bitesize
Can solids be compressed?
No
Bitesize
Liquids __- and take the shape of their ____
Liquids flow and take the shape of their container
Bitesize
Can liquids be compressed?
No
Bitesize
Gases flow and completely ___ their container
Fill
Bitesize
Gases ___ be compressed
Can
What is the name from going to a solid to a gas immediately
Give an example of something that can do that
Sublimation
Solid cO2
What is the gain of energy used for in state change
Overcome forces of attraction/break bonds
Energy is transferred to/from a substance when a substance freezes
From a substance - to the surroundings
Give 2 limitations of the particle model
Particles are not solid
Many atoms are not spherical
Nano particles have very large ___ to ___ ratios
Surface area
Volume
Give 4 uses of nanoparticles
Medical treatments
Cosmetics/deodorants
Electronics
Catalysts
What nano particle type is used in sunscreens?
Zinc oxide - as it blocks ultraviolet light and is invisible on the skin
Give 2 disadvantages of nano particle sunscreen
Clumping together to make them hard to apply
As they are invisible =, you can’t tell where it is applied
What property of nano particles makes them good catalysts
They have large surface area to volume ratios
How are nano particles used on window panes?
Self cleaning window panes have nanopartc8lare coatings which catalyse the breakdown of dirt in teh presence of sunlight
Give 3 possible risks of nano particles
They could be breathed in or
pass into cell and catalyse harmful reactions and they
Could bind to toxic chemicals and then get into our bodies
Suggest a risk of using silver nanoparticles to dress wounds
Could harm useful bacteria (when thrown away)
What are nanopartciles?
Particles between 1 and 100 nm in size
