EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：4.1.3 Classifying Organic Reactions Classifying Organic Reactions The reactions of organic compounds can be classified into substitution, ad...
Phytochrome Flowering in plants is controlled by the stimulus of night length Nights are shorter during the spring and summer and longer in the autumn and winter Some plants flower when nights are ...
The Effects of IAA Just like animals, the survival of plants is dependent on their ability to respond to changes in their environment; this maximises their survival chances e.g. Growing towards lig...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：4.1.1 Organic Compounds Representing Organic Compounds Introduction Organic Chemistry is the scientific study of the structure, properties, ...
Detection of Light The eye is a sense organ containing receptors sensitive to light intensity and wavelength Receptors are specialised cells that can generate an electrical impulse in a sensory neu...
Synapses: Structure & Function Structures known as synapses are found at the junctions between cells in the nervous system e.g. In the sense organs there are synapses between sensory receptor c...
Transmission of Nerve Impulses Neurones transmit electrical impulses which travel along the neurone cell surface membrane from one end of a neurone to the other Note that an impulse is not an elect...
3.2.5 Practical: Effect of Catalysts on Rate of Reaction Practical: Effect of Catalysts on Rate of Reaction Aim: To investigate the effect of different solids on the catalytic decomposition ...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：3.2.4 Practical: Effect of Surface Area on Rate of Reaction Practical: Effect of Surface Area on Rate of Reaction Aim: To investigate the effect of...
