EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记:2.4.1 Metals Reacting with Water & Acids

EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记:2.4.1 Metals Reacting with Water & Acids

Metals Reacting with Water & Acids

 

  • The chemistry of the metals is studied by analysing their reactions with water and acids
  • Based on these reactions a reactivity series of metals can be produced
  • The series can be used to place a group of metals in order of reactivity based on the observations of their reactions with water and acids

 

4.1.2-Metals-Reacting-with-Water-and-Acids-Summary-Table

 

Reaction with water

  • The reactions of potassium and sodium have already been seen previously in the alkali metals, but the reaction with calcium and water is given here for reference:

 

Ca (s) + 2H2O (l) ⟶ Ca(OH)(aq)  + H2(g)

 

calcium + water ⟶ calcium hydroxide + hydrogen

 

  • The reactions with magnesium, iron and zinc and cold water are very slow

 

 

 

Reaction with dilute sulfuric or hydrochloric acids

  • Only metals above hydrogen in the reactivity series will react with dilute acids
  • The more reactive the metal then the more vigorous the reaction will be
  • Metals that are placed high on the reactivity series such as potassium and sodium are very dangerous and react explosively with acids
  • When acids react with metals they form a salt and hydrogen gas:
  • The general equation is:

 

metal + acid ⟶ salt + hydrogen

  • Some examples of metal-acid reactions and their equations are given below:

 

Acid-Metal Reactions Table 

 

4.2.1-Acids-and-Metals-Examples-Table

转载自savemyexams
更多IGCSE课程
翰林国际教育资讯二维码