IGCSE化学paper2如何复习 考点梳理已经帮你准备好了

相信每个同学在IGCSE化学paper2考试前都渴望一份考点梳理，帮助自己划定最小复习范围，事半功倍地冲刺满分。因此特意给大家送上IGCSE化学paper2考点梳理与答题技巧，希望能缓解你的考前焦虑。

IGCSE化学paper2考点

atomic structure

reactivity of metals

chemical test

organic

acid base and salt

calculation

energy change

bond energy

chromatography

elements, compounds and mixtures

the periodic table

rate of reaction

electrolysis

redox

equilibrium

gas in atmosphere

group 7

state of matter

group 1

titration

dot and cross digram

bonding and structure

crude oil

ammonia

formula equation

group 2

alkene

chemical test

接下来和大家讲讲chemical test部分。按照大纲要求：

（1）describe tests for these gases:

• hydrogen   【‘pops’ with a lighted splint】

• oxygen      【relights a glowing splint】

• carbon dioxide   【gives a white ppt. with limewater】

• ammonia    【turns damp red litmus paper blue】

• chlorine      【bleaches damp litmus paper】

（2）describe how to carry out a flame test

【1. The technique is first of all to clean the end of a piece of platinum or nichrome wire by dipping it into clean hydrochloric acid and then placing it in a roaring Bunsen flame. This procedure should be repeated until the wire no longer produces a colour in the flame.

2. The end of the wire should then be dipped into fresh hydrochloric acid and then into the solid sample under test.

3. The end of the wire should then be placed into a non-roaring, non-luminous Bunsen flame.】

（3）know the colours formed in flame tests for these cations:

• Li+ is red

• Na+ is yellow

• K+ is lilac

• Ca2+ is orange-red

• Cu2+ is blue-green

（4）test of cations

• NH4+ using sodium hydroxide solution and identifying the gas evolved 【放出的气体是NH3】

• Cu2+, Fe2+ and Fe3+ using sodium hydroxide solution 【Cu(OH)2, Fe(OH)2, Fe(OH)3颜色分别是blue, green, red-brown】

（5）test of anions

• Cl–, Br– and I– using acidified silver nitrate solution 【AgCl, AgBr, AgI颜色分别是white, cream, yellow】

• SO42– using acidified barium chloride solution  【BaSO4是white precipitate】

• CO32– using hydrochloric acid and identifying the gas evolved. 【CO2 is released】

真题演练

最后，让我们用一道IGCSE化学paper2真题来结束今天的考点梳理吧。    

(b) The student carries out a test to show that the solution formed when metal U reacts with dilute sulfuric acid contains sulfate ions,

Use words from the box to complete the sentence about this test.

Each word may be used once, more than once or not at all.

解析：b题，含有SO42-离子的检验，那使用含有Ba2+离子的物质检验，答案选择 【solution of barium chloride】,观察到白色沉淀BaSO4, 因此答案是【white precipitate】。

C问，flame test中是lilac颜色的metal ion是K，答案选择potassium.

好啦，对IGCSE化学paper2考点梳理就到这里，不知道最后一道真题你解答了吗？如果这份重点整理对你来说还不够有操作性，或者你还没有找到适合自己的复习节奏，如何不想在错误的方法里越走越远，点击报名【橡沐IGCSE同步培训班】，橡沐教学天团授课，可根据学校教学进度定制课程，精准定位学员问题，一站搞定知识点梳理、应试技巧点拨、考试状态训练，在起跑线锁定A*。

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