Mychem is a web-based resource dedicated to supporting the tutoring, teaching and learning of chemistry. It includes animations, images, infograms, text, activities, selected videos , quizlet and powerpoint presentations. Mychem has been constructed as a support site - specifically to support teachers and students foll...
Students should: 1.3 understand how the results of experiments involving the dilution of coloured solutionsand diffusion of gases can be explained This classic demonstration is used to demonstrate diffusion rates QuestionsAnswers in this reaction the two reactants are ammonia and hydrogen chloride write down the formula of each of these compo...
Gases can diffuse into each other . This is because the particles in a gas are in a state of constant random motion. 1.4 Activity 5 : Defining diffusion, diluting and dissolving Gases can diffuse into each other . This is because the particles in a gas are in a state of constant random motion. Liquids can diffuse into other liquids. Whe...
1.1 Introducing the states Matter can exist in one of three fundamental states: Solid, Liquid or Gas Here we consider the way in which these three states behave We see how matter can be converted from one state into another and we introduce the terms used for these changes. Evaporation, condensation, melting, freezing , sublimation and deposi...
1.26 "Counting" by measuring mass Sometimes chemists need to "count" out a specific number of atoms, ions or molecules of a substance. Atoms are very very small - too small to see. It is therefore impossible to measure them out by counting individually. Instead we "count" them out by measuring their mass - much like ...
Magnesium is a highly reactive metal which reacts violently with oxygen to produce a white solid called magnesium oxide. This can be shown as follows: Chemical equations are a useful shorthand way of describing the changes that take place when a chemical reaction happens. Word equations can be helpful for example :...
Chromatography is another important separation technique. Several different types of chromatography exist.
If a nucleus was the size of a raisin, the rest of the atom would be the size of a sports stadium
1.15 Sub atomic particles Students should: 1.15 know the structure of an atom in terms of the positions, relative masses and relativecharges of sub-atomic particles. Here we look at the particles inside the atom. Sub atomic particles are the particles found inside atoms. These include protons, neutrons and electrons: protons a...
Relative masses allow chemists to "count out" atoms and molecules so they can ensure that the appropriate amounts of substances are reacted.