Twelve chemical equations commonly found in junior high school

1. Lime water and carbon dioxide.

Reaction: Ca(OH)2

co2caco3

h2o；2. Reaction of marble with dilute hydrochloric acid: CaCO32HClCaCl2

h2oco2↑；

3. Hydrogen peroxide.

Under the condition of manganese dioxide as a catalyst:

h2o2mno22h2o+o2

4. Heat potassium permanganate.

2kmno4△

k2mno4

mno2o2↑；

5. Heating potassium chlorate and manganese dioxide mixed heating: 2kclo3=mno2, heating = 2kcl+3o2;

6. High temperature calcined limestone (industrial carbon dioxide): CaCO3 high temperature.

caoco2↑；

7. Electrolyzed water: 2H2O

Power. 2h2↑+o2

8. Carbon monoxide reduced iron oxide: 3CO+FE2O3=high temperature=2FE+3CO2;

9. Sodium chloride solution.

and silver nitrate solution: NaCl

agno3agcl↓

nano310, sodium sulfate.

and barium chloride: Na2SO4BACL2

baso4↓

2nacl；

11. Caustic soda.

Deterioration on exposure to air: 2NaOH

co2na2co3

H2O12, calcium hydroxide.

With sodium carbonate: Ca(OH)2

na2co3

caco3↓+

2naoh。

1. Calcium hydroxide aqueous solution reacts with carbon dioxide: Ca(OH)2CO2CaCO3

h2o；2. Calcium carbonate reacts with dilute hydrochloric acid: CaCO32HClCaCl2

h2oco2↑；

3. Hydrogen peroxide under the condition of manganese dioxide as a catalyst

h2o2mno22h2o+o2

4. Heating potassium permanganate: 2kmNO4

k2mno4

mno2o2↑；

5. Heating potassium chlorate and manganese dioxide mixed heating: 2kclo3=mno2, heating = 2kcl+3o2;

6. High-temperature calcined calcium carbonate (industrial carbon dioxide): CaCO3 high temperature.

caoco2↑；

7. Electrolyzed water: 2H2O

Power. 2h2↑+o2

8. Carbon monoxide reduction of ferric oxide: 3CO + FE2O3 = high temperature = 2FE + 3CO2;

9. Sodium chloride solution and silver nitrate solution: NaCl

agno3agcl↓

nano310, sodium sulfate, and barium chloride: Na2SO4BACl2BaSO4

2nacl；

11. Sodium hydroxide deteriorates when exposed to air: 2NaOHCO2NA2CO3

H2O12, calcium hydroxide and sodium carbonate: Ca(OH)2Na2CO3

caco3↓+

2naoh

zncu

so4znso4cu

cuoh2so4cu

so4h2o

Sodium hydroxide solution reacts with copper sulfate solution: 2NaohCuSO4Cu(OH)2

na2so4

Methane burns in air: CH4

2O2 ignited.

co22h2o

Alcohol burns in air: C2H5OH

3O2 ignites.

2co23h2o

Carbon monoxide reduced copper oxide: CO+

cuo heating.

CuCO2 carbon monoxide reduces iron oxide: 3CO+

Fe2O3 high temperature.

2fe3co2

Carbon dioxide passes through clarified lime water (test carbon dioxide): Ca(OH)2CO2CACo3H2O

Sodium hydroxide and carbon dioxide reaction (carbon dioxide removed): 2NaOHCO2Na2CO3H2O

Reaction of limestone (or marble) with dilute hydrochloric acid (laboratory preparation of carbon dioxide): CaCO32HCl

cacl2h2oco2↑

Sodium carbonate reacts with concentrated hydrochloric acid (principle of foam fire extinguisher):

na2co32hcl

2naclh2o

co2↑