By Christopher Talbot
Supply transparent information to the 2014 adjustments and confirm in-depth examine with obtainable content material, at once mapped to the hot syllabus and method of studying This moment variation of the highly-regarded first variation includes all SL and HL content material, that is essentially pointed out all through. concepts can be found loose on-line, in addition to appendices and information and records. - increase examination functionality, with exam-style questions, together with from previous papers - combine conception of information into your classes and supply possibilities for cross-curriculum research - Stretch extra capable scholars with extension actions - The shift to concept-based method of studying , Nature of technology, is roofed through offering a framework for the direction with issues for dialogue - Key talents and experiments integrated - complete electronic package deal - provided in numerous codecs that you should bring the direction simply the way you like!
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Extra resources for Chemistry for the Ib Diploma
19/05/15 4:23 pm 38 1 Stoichiometric relationships ■■ Relationship between temperature, pressure and volume of a gas In a gas the molecules are completely free to move in all directions and travel in straight lines until they collide with other gas molecules or atoms or bounce off the walls of the container. 49). Forces of attraction between molecules or between single molecules and molecules of the walls of the container are usually so small that they can be neglected. However, when molecules approach close to one another, or to molecules of the walls, their kinetic energy brings them close enough for these forces to become repulsive and no longer negligible – hence they rebound.
The temperature remains constant during this change (if it is performed slowly, so that the air can remain in temperature equilibrium with the syringe and the surroundings). 50 A syringe of air connected to a pressure gauge The increase in the pressure of the gas is due to the increase in the frequency of collisions between the gas particles and the container walls. Since the volume is smaller, and the number of particles is constant, they hit the walls more often. There are a number of very useful simulations of the various gas laws on the internet.
His most critical contribution was making the distinction between atoms and molecules. His hypothesis was based on the careful experimental work by Gay-Lussac and John Dalton’s atomic theory. He trained and practised as a lawyer, but later became Professor of Physics at Turin University. As a tribute to him, the number of particles in one mole of a substance is known as the Avogadro constant (formerly known as the Avogadro number). 19/05/15 4:23 pm 38 1 Stoichiometric relationships ■■ Relationship between temperature, pressure and volume of a gas In a gas the molecules are completely free to move in all directions and travel in straight lines until they collide with other gas molecules or atoms or bounce off the walls of the container.