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Summary and Phenomenon of Chemical Equation of Junior Three (Excellent)

Summary and Phenomenon of Chemical Equation of Junior Three (Excellent)

Summary of elementary three chemical equations classified by element

Editor's note: The main purpose of this summary is to help you cope with the inferential questions of the third grade chemistry, which is the so-called block diagram questions. When you are working on a block diagram problem, you should immediately see all the reactions and phenomena related to a certain substance when you see a certain matter, and select the response that matches the problem, and then solve the problem step by step. Hope this small summary can bring a little help to your chemistry study, and the editor will be satisfied. Because it is classified by element, some reactions are repeated, and I apologize.

Chemical equations related to oxygen:

2Mg + O2 ignition ==== 2MgO Phenomenon: Burn, emit a lot of heat, and emit dazzling white light at the same time

S + O2 Ignition ==== SO2 Phenomenon: A light blue flame in the air; a blue-violet flame in pure oxygen; and a gas with a pungent odor.

C + O2 ignited ==== CO2 Phenomenon: Generate gas that can make pure lime water turbid

2C + O2 ignition ==== 2CO Phenomenon: In addition to combustion, other phenomena are not obvious

4P + 5O2 ignites ==== 2P2O5 Phenomenon :: Generates white smoke

3Fe + 2O2 ignited ==== Fe3O4 Phenomenon: Violent burning, Martian radiation, black solid

2H2 + O2 ignites ==== 2H2O phenomenon: light blue flame

2H2O2MnO2 ==== 2H2O + O2 ↑ Phenomenon: A large number of air bubbles appear in the solution

2HgO △ ==== 2Hg + O2 ↑ Phenomenon: Silver-white liquid metal is formed

2KClO3MnO2 ==== 2KCl + 3O2 ↑ Phenomenon: Generates gas that can re-ignite wood with Mars

2KMnO4 △ ==== K2MnO4 + MnO2 + O2 ↑ Phenomenon: Same as above,

-----------------Dividing line----------------

Chemical equations related to hydrogen:

2H2 + O2 ignites ==== 2H2O phenomenon: light blue flame

Zn + H2SO4 == ZnSO4 + H2 ↑ Phenomenon: Combustible gas is generated

Mg + H2SO4 == MgSO4 + H2 ↑ Phenomenon: Same as above

Fe + H2SO4 == FeSO4 + H2 ↑ Phenomenon: It turns into a light green solution and emits gas at the same time

2Al + 3H2SO4 == Al2 (SO4) 3 + 3H2 ↑ Phenomenon: Gas generation

Zn + 2HCl == ZnCl2 + H2 ↑ Phenomenon: Same as above

Mg + 2HCl == MgCl2 + H2 ↑ Phenomenon: Same as above

Fe + 2HCl == FeCl2 + H2 ↑ Phenomenon: The solution becomes light green and gas is released at the same time

2Al + 6HCl == 2AlCl3 + 3H2 ↑ Phenomenon: Gas generation

H2 + CuO ==== Cu + H2O Phenomenon: From black solid to red, water droplets are generated at the same time

high temperature

2Fe2O3 + 3H2 ===== 2Fe + 3H2O Phenomenon: Water drops are formed, and the solid color changes from red to silvery white

----------------Dividing line------------------

Chemical equations related to carbon:

C + O2 ignition ==== CO2 (in the case of sufficient oxygen) Phenomenon: Generate a gas that can make pure lime water turbid 2C + O2 ignition ==== 2CO (in the case of insufficient oxygen) Phenomenon: Not obvious

high temperature

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