Electrical Activitiy in the Heart Control of the basic heartbeat is myogenic, which means the heart will beat without any external stimulus This intrinsic rhythm means the heart beats at around 60 ...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：2.7.5 Tests for Water Tests for Water Water can be identified using a chemical test and/or a physical test Chemical test for water An...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：2.7.4 Tests for Anions Tests for Anions Testing for Anions Table Exam Tip When it comes to qualita...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：2.7.3 Tests for Cations Tests for Cations Metal cations in aqueous solution can be identified by the colour of the precipitate they f...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：2.7.2 Flame Tests Flame Tests Metal ions produce a colour if heated strongly in a flame Ions from different metals produce different colours...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：2.7.1 Tests for Gases Tests for Gases Many reactions in the lab produce gases which then need to be tested The table below indicates ...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：2.6.6 Practical: Prepare Copper(II)Sulfate Practical: Prepare Copper(II)Sulfate Aim: To prepare a pure, dry sample of hydrated copper(II) sulfate c...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：2.6.5 Prepare a Soluble Salt Prepare a Soluble Salt A soluble salt can be made from the reaction of an acid with an insoluble base During th...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：2.6.4 Bases Bases What makes a base act like a base? Bases are substances which can neutralise an acid, forming a salt and water The term ba...
