Senior 1 Chemistry Compulsory 1 Review Syllabus 5

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It is most important to master the knowledge of metals and metal compounds, and the non-metal part is also more important.

1 Reaction of chlorine gas with sodium hydroxide: Cl2+2NaOH=NaCl+Naclo+H2O

2 Iron wire burns in chlorine gas: 2Fe + 3Cl2 ignites ===2FeCl3

3. Preparation of bleaching powder (chlorine can pass into lime slurry) 2Cl2 + 2Ca(OH)2=CaCl2+Ca(CLO)2+2H2O

4 Reaction of chlorine gas with water: Cl2+H2O=HCl+HCl

5 Sodium hypochlorite deteriorates in air: Naclo+CO2+H2O=NaHCO3+HCl

6 Calcium hypochlorite deteriorates in air: Ca(ClO)2+CO2+H2O=CaCO3 +2HClLop

Electrolytes 1, multiple-choice type.

1) Among the following substances, the one that cannot conduct electricity is (b) Take a good look at the concept of electrolyte).

a, melted potassium nitrate b, potassium nitrate crystals c, potassium nitrate aqueous solution d, dilute nitric acid.

2) Among the following substances, (b) is a non-electrolyte

A, acetic acid B, ethanol C, salt D, caustic soda.

3) The following substances are non-electrolytes (a).

a、co2 b、na c、nh4cl d、h2co

4) The following statement about electrolytes is correct (d) (look at the concept of electrolytes in the book).

a.Liquid HCl does not conduct electricity, so HCl is not an electrolyte.

The solution formed by dissolving in water conducts electricity, so NH3 is an electrolyte.

Soluble in water can conduct electricity, so SO2 is an electrolyte.

It is difficult to conduct electricity in aqueous solution, but it can conduct electricity when melted. BASO4 is an electrolyte.

2. Write ionization equations or even ion equations.

1) Of the following ion equations, the correct one is (c).

A dilute sulfuric acid is dropped on the copper sheet: Cu 2H + Cu2 + H2 (the reaction does not occur).

b Sodium sulfate solution mixed with barium chloride solution: SO42 BA2+ BASO4

c Hydrochloric acid drops on limestone: CaCO3 2H + Ca2 + H2CO3

d Copper oxide mixed with sulfuric acid: Cu2+ SO42 CuSO4

For example, chlorine gas is introduced into ferrous chloride solution: Fe2++Cl2=Fe3++2Cl

Cl2+H2O=2H++Cl +CL (reversible not).

na+2h2o=na++2oh－+h2↑

The electrolyte is very simple, you just write the ion equation and you get the same ions on both sides, and the rest is the correct answer.

Where you come from, the teaching materials vary from place to place, and the key is to lay a solid foundation on a regular basis.