العلاقة بين درجة الحرارة و ثابت سرعة التفاعل العلاقة بين سرعة التفاعل ودرجة الحرارة سرعة التفاعلات الكيميائية تزداد بارتفاع درجة الحرارة ، فمثلاً تعفن وتحمض الخضراوات والفواكه أسرع في الصيف منه في الشتاء ، ... Read more

REACTION RATE The REACTION RATE or RATE OF REACTION is the speed at which reactants are converted into products. For example, the oxidative rusting of iron under Earth's atmosphere is a slow reaction that ... Read more

Effect of catalyst Addition of a catalyst provides an alternative route for the reaction with a lower activation energy. Thus enhance the reaction rate. Read more

States of matter In physics, a STATE OF MATTER is one of the distinct forms in which matter can exist. Four states of matter are observable in everyday life: solid, liquid, gas, and plasma. ... Read more

general information about the main parts of UV-vis spectro photometer and their region, energy, diagram, laws and effects. Read more

APPLICATION OF THE KINETIC THEORY OF MATTER APPLICATION OF THE KINETIC THEORY OF MATTER CHANGE OF STATE MELTING - when a solid substance gains heat, the kinetic energy of its particles increases and they ... Read more

The PERIODIC TABLE, or PERIODIC TABLE OF ELEMENTS, is a tabular arrangement of the chemical elements, ordered by their atomic number, electron configuration, and recurring chemical properties, whose structure shows _periodic trends_. Generally, within ... Read more

TRANSITION METALS: COLOUR OF SALTS Transition elements are usually characterised by having d orbitals. Now when the metal is not bonded to anything else, these d orbitals are degenerate, meaning that they all have ... Read more