Flashcards
Chemistry
Flashcards do conjunto (6)
- 1Use the Kinetic Theory to explain the concept of absolute zero.Absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance. At absolute zero, a substance has no volume and no kinetic energy.
- 2Explain the structure of the atom in terms of protons, neutron and electrons.
- 3Write the electron configuration using the shell model for the first 20 elements.The amount of electrons in each shell of an atom in it;s ground state.
E.g. Calcium: 2,8,8,2
- 4Explain trends in 1st Ionisation Energy (Energy required to remove an electron) across periods and down groups in the periodic table.- Increases across. The nucleus becomes more positive while electrons are being added to the same shell. Hence ↑ electrostatic attraction.
- Decreases down. Electrons are being placed in valence shells further away from the nucleus. Hence ↓ electrostatic attraction. - 5Explain trends in atomic radius across periods and down groups in the periodic table.- Decreases across. The nucleus becomes more positive while electrons are being added to the same shell. Hence ↑ electrostatic attraction, pulling e closer.
- Increases down. Electrons are being placed in valence shells further away from the nucleus. Hence ↓ electrostatic attraction. - 6Explain trends in electronegativity across periods and down groups in the periodic table.- Increases across. The nucleus becomes more positive while electrons are being added to the same shell. Hence ↑ electrostatic attraction.
- Decreases down. Electrons are being placed in valence shells further away from the nucleus. Hence ↓ electrostatic attraction.
Informações
- Descrição
- Year 12 Politics and Law FlashCards sobre Chemistry , criado por neeishaaxx em 21-10-2014.
- Criado por
- neeishaaxx · out 2014
- Atualizado
- 19 fev 2016
- Visualizações
- 8
- Tags
- Avaliação