All Quantitative chemistry and stoichiometry articles – Page 4
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ResourceOn This Day – Aug 08 : Henri Hess was born
He studied energy changes during chemical reactions, and postulated a method of predicting them – Hess’s Law. This is now routinely used by chemists to make predictions for enthalpy changes.
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CPD
Moles and titrations
Dorothy Warren describes some of the difficulties with teaching this topic and shows how you can help your students to master aspects of quantitative chemistry
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Challenging plants: Plant science
An understanding of the structure and function of plants, the movement of materials through them and the chemical reactions that happen within them helps scientists to exploit the potential of plants.
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Writing ‘explosive’ equations | Chemistry Olympiad worked answers
Practise writing equations in the context of explosives in this worked example of a Chemistry Olympiad question. Includes video walkthrough and transcript.
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Titration and phosphates in the environment | Chemistry Olympiad worked answers
Have a go at a worked example of a Chemistry Olympiad question on the use of titration to determine phosphate levels. Includes video walkthrough and transcript.
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Schools’ Analyst past papers 2014
Measure the acidity level of sprite, determine the weight of vitamin C in a tablet or test the copper content of water with these previous Schools’ Analyst competition challenges.
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A birthday cake candle timer
In Search of Solutions: Burning candles lose mass, use this knowledge to make a timer. Linking to topics on combustion and friction.
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School’s Analyst past papers 2013
Challenge your students to carry out back titrations with these previous Schools’ Analyst questions
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On This Day – Aug 09 : Amedeo Avogadro was born
He was one of the founders of physical chemistry and is most famous for Avogadro’s Law, which states that equal volumes of different gases contain the same number of molecules. In 22.4 litres of any gas at room temperature and pressure there are 6.02214 x 1023 molecules, known as Avogadro’s number.
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On This Day – Jul 13 : Cannizzaro was born
He was the first chemist to see the full significance of Avogadro’s law. In the 1850s, Cannizzaro suggested comparing everything to the mass of a hydrogen (H) atom. This helped chemists establish chemical formulae and make reliable chemical calculations.
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On This Day – Jul 09 : Amedeo Avogadro died
His hypothesis – now known as Avogadro’s Law – states that equal volumes of gases at a given temperature and pressure contain the same number of molecules. This is now widely accepted, and the number of molecules in a mole is referred to as Avogadro’s number, 6.023 x 1023.
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On This Day - Jun 13 : James Maxwell was born
Maxwell helped to formulate electromagnetic theory, which links magnetism, electricity and light. He also investigated the kinetic theory of gases and developed part of the Maxwell-Boltzmann distribution, which helps scientists to understand the effects of temperature on reaction rates.
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Schools’ Analyst past papers 2012
Investigate the amount of active ingredient in aspirin tablets, paracetamol tablets and cold and flu remedies.
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28 chemistry puzzles for 14-16 years
Use these sudoku-inspired puzzles with printable worksheets and answers to help 14–16 year olds consolidate their understanding of key chemical concepts.
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Exhibition chemistry
Floating Gas Bubbles
Demonstrations designed to capture the student's imagination
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Feature
Catalysts for a green industry
Chemists are working to develop new, longer-lasting catalysts to ensure industrial processes are cleaner, greener and more efficient
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Lesson plan
How does burning magnesium affect its mass? | 11-14 years
Investigate what happens to the mass of magnesium when it burns and reacts with oxygen using this lesson plan and practical activity for 11–14 year olds.
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Lesson plan
Conservation of mass in dissolving and precipitation | 11-14 years
Explore what happens during precipitation reactions and when substances dissolve using this lesson plan with downloadable activities for 11–14 year olds.
