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Particles
Revision and exam practice for Particles.
8
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10
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10
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72 min
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OcrGcseChemistry A GatewayParticles
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8 objective pages available
Understanding the Particle Model: States of Matter and Changes of State1 objectives
- Communicate the key features of the main features of the particle model in terms of states of matter and change of state.
Physical and Chemical Changes: A Particle Model Approach1 objectives
- Account for in terms of the particle model the distinction between physical changes and chemical changes.
Limitations of the Particle Model for Changes of State (Higher)1 objectives
- Account for the limitations of the particle model in relation to changes of state when particles are represented by inelastic spheres (e.g. like bowling balls).
Evolution of the Atomic Model1 objectives
- Communicate the key features of the way and why the atomic model has changed over time.
Structure of the Atom1 objectives
- Communicate the key features of the atom as a positively charged nucleus surrounded by negatively charged electrons, with the nuclear radius much smaller than that of the atom and with most of the mass in the nucleus.
The Nanoscale World: Understanding the Size of Atoms and Small Molecules1 objectives
- Retrieve and apply knowledge of the typical size (order of magnitude) of atoms and small molecules.
Subatomic Particles: Charges and Masses1 objectives
- Retrieve and apply knowledge of relative charges and approximate relative masses of protons, neutrons and electrons.
Atomic Structure: Protons, Neutrons, and Electrons1 objectives
- Work out numbers of protons, neutrons and electrons in atoms and ions, given atomic number and mass number of isotopes.
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Practice preview
- A negative ion, Y³⁻, has an atomic number of 15 and a mass number of 31. How many electrons does this ion possess?
- What happens to particles when a substance changes from a liquid to a gas?
- State the typical order of magnitude for the diameter of an atom, providing your answer in nanometres and then converting it into metres. [2 marks]
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