High 2 Chemistry Questions, Answers 。。。。。。。。。

Hello! 1,Zn+2HCN=H2+ZN(CN)2 The amount of hydrocyanic acid is The amount of zinc is The amount of zinc is visible that hydrocyanic acid is completely reacted, and the amount of zinc remaining so that the amount of gas formed is , and the volume is.

2, 10g of pure carbonic acid, the carbon dioxide that can be obtained, 10g of impure calcium carbonate can get carbon dioxide, it can be seen that the average molar mass of 10g of impure calcium carbonate is smaller than the average molar mass of 10g of pure carbonic acid, that is to say, the molar mass of impurities contained in 10g of impure calcium carbonate is smaller than that of calcium carbonate, so choose a

Hope it helps!

According to the national standard, M is not used as a substitute for mol L, and it should not be used again in the future.

First calculate the amount of hydrochloric acid:

Then calculate the amount of the substance of zinc:

So: according to the equation zn+2HCl=H2+zn(cl)2, we know that there is a surplus of zinc.

Therefore, according to HCl, the more CO2 is obtained, which means that the amount of carbonate is more, that is, the average molar mass of the mixture is less than the molar mass of calcium carbonate, and only A is suitable.

The second question is A, and the first question is about what.

1.No change. Not only vinegar and acid, but also the power equilibrium constant of any compound in aqueous solution is only related to the temperature of the solution, and has nothing to do with other conditions.

2.C(CH3CoOH) at equilibrium can be approximated as still equal to C(H+)=C(CH3CoO-).

So c(h+) = under the root sign (multiplied by 10-5 power c(CH3Cooh)) = power.

As can be seen from the title, the amount of Ag ions is Ab 1000mol, because Ag ions happen to be completely precipitated, so the amount of hydrochloric acid added is equal to the amount of Ag ions.

So the amount of matter of H+ = the amount of substance of Cl- = the amount of substance of Ag+ = Ab 1000mol L

According to the equal amount of substances before and after the H+ reaction, it is listed:

A=10, so H+ the amount of matter obtained is.

So ab 1000 = get b =

Reaction formula: agno3+hcl=agcl+hno3ag+ complete precipitation, n(agno3)=n(hcl)ph=1, c(hcl)=c(h+)=

bmol/l*aml=

b = the amount of h+ species before and after the reaction is unchanged.

n(h+)=

After the reaction, pH = 2, C (H +) =

The solution is a=90b=

n(ag+)= mol

1 mol of Ag+ requires 1 mol of Cl ions to generate AgCl precipitate, so 1 mol of HCl is required

And the concentration of HCl added is:

At this time, pH = 2 says that Hcl is excessive, and the amount of excess part of the substance is so the amount of total H+ substance is.

At this point v(hcl)=

Because it is diluted from pH = 1 to pH = 2, the dilution is 10-fold A = 100 * (

AgNO3 reacts 1:1 with HCl.

Therefore, nagno3=nhcl

So b=

1] Water = hydroxide ion + hydrogen ion. Ammonium ion + water = ammonia + hydrogen ion. Ammonium ion + hydroxide ion = ammonia.

2] Water molecules, ammonia molecules, hydrogen ions, hydroxide ions, ammonium ions, potassium ions, chloride ions.

3] Chloride ions

1 False, the higher the concentration of free ions in the solution, the stronger the conductive energy, so the conductivity of a very dilute strong electrolyte solution may be weaker than that of a concentrated weak electrolyte solution.

2 false, equal. If the volume and the degree of concentration are equal, the amount of the substance and sodium hydroxide need to be equal.

3 False, ammonia is a weak electrolyte, and the diluted concentration will be greater than the original 1 2.

4 False, acetic acid is a weak electrolyte, and the concentration of H+ is less than that of hydrochloric acid.

5 False, phosphoric acid is a weak electrolyte, and sodium phosphate (salt) is a strong electrolyte, so the phosphoric acid solution contains PO4

3- Less than sodium phosphate.

Density = mass Volume = molar mass Molar volume, since the molar volume of the gas is the same in the same condition, then the density of the gas is proportional to the molar mass. Since the molar mass of hydrogen is 2 grams per mo, it can be seen that the average molar mass of a mixture of methane and carbon monoxide is 19 grams per mo.

Na and O2 may form Na2O2 or Na2O, but this is only the valency of the O element in the product, which is +1 valence, that is, each Na atom can only lose 1 electron.

The complete reaction loses electrons, i.e., electrons.

This statement is true.

As long as the Na reacts completely, 1molNa loses 1mol of electrons.

Na is a mole After the reaction Na becomes +1 and loses the molar electron (Na is completely with O2, so don't consider the product generated in the question, that's interference).

O2 is completely combusted, and sodium peroxide is generated, 2Na+O2==Na2O2, and it can be known that 2molna becomes 2molNa+, so it is transferred.

The concentration of reactants is increased, and the equilibrium shifts in the direction of positive reaction. From the perspective of the total reaction, it should be a reversible reaction, so the concentration of reactants should be continuously increased to make it move in the direction of the positive reaction.