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Chemistry

GCSE · AQA

QuestionsFlashcards

Simple Model of the Atom
The Periodic Table
Properties of Transition Metals
- Typical Properties of Transition Metals
  7
- Transition Metals vs. Alkali Metals
  6

Ionic, Covalent & Metallic Bond
Bonding & Substance Properties
Structure & Bonding of Carbon
Bulk & Surface Properties
- Sizes of Particles & their Properties
  6
- Nanoparticles
  6

Formation of Earth's Atmosphere
CO2 & CH4 as Greenhouse Gases
Causes of Atmospheric Pollution
- Atmospheric Pollutants from Fuels
  6
- Properties & Effects of Atmospheric Pollutants
  6

Global Reserves & Potable Water
Life Cycle Analysis & Recycling
- Life Cycle Assessment
  7
- Reducing Use of Resources
  5
Using Materials
Haber Process & NPK Fertilisers

Nanoparticles Flashcards

All 6 cards in this deck

True or false? As the side of a cube decreases by a factor of 10, its surface area to volume ratio also decreases by a factor of 10.: False. The surface area to volume ratio increases by a factor of 10.
Why may nanoparticles have different properties from the same material in bulk?: Because they have a very high surface area to volume ratio.
True or false? Larger quantities of a nanoparticulate material are needed to be effective than of the same material with normal particle sizes.: False. Smaller quantities of the nanoparticulate material are needed to be effective.
Give the main applications of nanoparticles.: Medicine, electronics, cosmetics and sun creams, deodorants, and catalysts.
Give one advantage of using nanoparticles instead of fine particles of the same material in a coating or cream.: Less material is needed for the same effect (a thinner coating), because of the higher surface area to volume ratio.
What possible risks are associated with the use of nanoparticles?: Their effects on health are not fully known — they may be absorbed into the body or enter cells, and long-term effects have not been tested.