Science_Chemistry-Learning outcomes acids&bases(examples of chemical change)

1.magnesium,iron,zinc; react with sulfuric,citric,acetic acid {use 2 molL-1solutions}
Mg react with sulfuric bubbling fast then disappear.
Fe react with sulfuric bubbling slowly then disappear but solution was light green.
Zn react with sulfuric bubbling then disappear.
三种金属与三种酸都反应并置换出气体。
Conclusion: When metals react with acids they all produce hydrogen.{H2}
Equations:The chemicals that react with each other on the left of arrow.{Arrow means transform/change.}
General word equations for acid-metal reactions: Metal+Acid ---> Metal compound+Hydrogen
2.Compare chemical and physical changes:
  ①Chemical change is any change that results in the formation of new chemical substances.At the molecular level,chemical change involves making or breaking bonds between atoms. These changes are chemical.
  ②Physical change rearranges molecules but doesn't affect their internal structures.
3.Hydrochloric acid(HCL),Sulfuric acid(H2SO4)
4.Sodium hydroxide(NaOH),Ammonia(NH4）
5.Identify acids and bases use in home:
 For example, Vinegar in salad dressing is Acetic acid乙酸（醋酸）；and apples contain Malic acid苹果酸（羟基丁二酸）；Vitamin C is acid. Bases are also found in common household products. Bases can be very strong and dangerous,or weak and safer for use around the house.
6.日用化学酸碱品涉及面很广，人们在日常生活中使用的许多种用品，如塑料制品、橡胶制品、合成纤维制品、肥皂、洗涤剂、化妆品、香精、文化用品等都是化学酸碱品，种类繁多。
7.Neutralisation:
  When a acid and a base react to product a neutral compound and water.
8.Carry out tests to identify the gasses——hydrogen and carbon dioxide.
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