A few chemistry questions!! 100 points: Help

a, it is not indicated as a standard condition.

b, hydrolysis should be considered.

c, if nitric acid is insufficient, it may be partially or completely ferrous ion d, 1molSiO2 has 4mol silicon-oxygen bonds, existing, so correct A, the amount of gaseous substances at the same temperature, pressure and volume is equal, and the average relative molecular mass of the gas in each bottle is unequal, so it is correct.

b, must be equal.

c, must be equal.

d, must be equal.

a, ionized in part.

b, obtained by the equation, transferred 1mol

c, from the inscription S8:, each S8 molecule has 8 S-S bonds, so there is 1Mold, and the standard condition is not specified.

a，2mol

b, each methane has four covalent bonds, so there are 4mol

C, equivalent to, each formaldehyde (CH2O) molecule has 16 electrons, so there is 4Mold, ammonia monohydrate is only partially ionized.

a, the total volume has changed.

b, the total volume has changed.

C, that's right.

D, there is 1mol Na2O2, which can be turned into 2mol NaOH, so it is a 2mol L NaOH solution.

: The title does not say anything about STP. If at minus 100 degrees, carbon dioxide is solid, and the molar volume of gas does not apply to solid substances.

d: If the molecular weight of silica is 60, then silica is 3 40mol

Silica is an atomic crystal, and the structure is a spatial network as I drew (it should be tetrahedral, but it can't be drawn)...Tired.

In this unit, the four SIs of the upper and lower sides only account for 1 4 (because the diagram is continued, it is shared with other units), and there are 4 O's and one SI in the middle

So there are 4*1 4+4+1=6 in a cell (two Si, 4O, i.e. 2 SiO2), and the number of bonds (as marked in the figure) is 8, so there are 8 2=4 bonds in each SiO2.

.si--.o..si--o--si--o--si--

.o..si--

So as mentioned earlier, silica has 3 40mol

Therefore, there are 3 40*4* silicon-oxygen bonds.

So choose d: because the volume is constant, the total number of particles is constant.

For example, in the case of gas, under STP, the total number of particles must be 1mol, regardless of whether it is a molecule or an atom, so in the title, the number of molecules is the same.

A: Since the number of molecules is the same, the molar mass is not the same, so A is wrong.

Question 10 A should not say the standard condition d o

o→si←o

o So you can understand. So there should be Moore.

11. Because it is the same temperature and pressure, it can be used as a standard condition, so it is all mol l, if they are all The amount of matter is the same = the total number of molecules, they are all diatomic molecules, so the number of molecules is the same.

18 acetic acid is a weak acid less than 1 mole 32gs4 s-s is built to be 1 mole.

4b methane covalently built should be 4mol c formaldehyde is a gas 16 electrons in 7c, because there are 5 crystals in the amount of cuso4 should be 160 250 The aqueous solution that accompanies it is 1mol L D1molNa2O2 has 2molna, so it should be 2 moles.

c is wrong.

In fact, even if you haven't studied chemistry, you should be able to choose this question, and you can see that C is wrong if you look at the expression of these options. Some impurities have an effect on the properties of substances, which will inevitably affect the study of such substances.

c. If impurities have an effect on the properties of this substance, the experimental results will be biased.

Let the solution in sodium carbonate be a and the other cup be b

Then the mass increase of a weight is m = the mass of sodium carbonate minus the mass of carbon dioxide that runs away after the reaction.

caco3+2hcl*****cacl2+co2↑+h2o

10g ： x

x=10*44 100= i.e. a mass has increased.

That is, Zn should be added to B, and the mass of hydrogen released by the reaction will be subtracted.

Let the reaction drop zn mass is y, the reaction releases hydrogen mass a should be a sufficient amount of hcl, so the zn added is equal to the zn consumed.

zn+2hcl===zncl2+h2↑

y : a2y=65a -- Simultaneous gives x= y=

The mass of zn that should be added is about.

In fact, it is the mass of zinc added minus the mass of hydrogen produced = 10g

Zn+2HCl=ZnCl2+H2 If x grams of zinc are added, then 65 x *2 is the amount of hydrogen produced, and x-65 x *2=10 can be solved to get the x value.

There must be people here who think that what I said is not right, and the landlord can go to the right answer, and mine is right and then adopt.

I don't know if I've miscalculated ==

2HCl+CACAO3==CaCl2+H2O+CO2 mass change.

100g 44g 56g

10gzn+2HCl==zNCL2+H2 mass change.

65g 2g 63g

xx=(65*

1.No answer, I remember doing something similar.

Option b is ethyl bromide and water, nitrobenzene and water.

Ethyl acetate and sodium acetate.

The question is = of choosing b

However, there is also a problem with b, and sodium acetate is solid =

Seed. Option that thing I don't know what sorry =

4.Acidic potassium permanganate is highly corrosive, and the rubber tube of the basic burette is restored.

Organics) = 2n(h2) =

If the molecular formula of organic matter is CNH2N+2O, then the oxygen consumption corresponding to 1mol of organic matter is n+(n+1) 2-1 2=144 32, and the solution is n=3

Therefore, the molecular formula is C3H6O, and the simple structure cannot be drawn here......However, there are two substances: n-propanol and isopropanol.

(1) Solution: Let the mass of the solid that theoretically requires mno2 be x g mno2 + 4HCl=mnCl2+Cl2 +2H2O87 71xx=

2) Because the reaction produces water, and the generated Cl2 reacts with water: H2O+Cl2=HCl+HCl, and consumes Cl2, so the actual mass of the MnO2 solid must be appropriately more than the theoretical amount.

mno2+4hcl=mncl2+cl2↑+2h2o87 71x

x = g2In fact, Mno2 contains impurities, and Cl2 is easy to react with water.

1) 4 bottles of chlorine with a volume of 100ml are required ***** = the mass of chlorine.

The mass of mno2 The mass of mno2 x = the mass of chlorine -- x is the mass of mno2.

2) Because chlorine is dissolved in water to produce hydrochloric acid + hypochlorous acid, you can calculate it in the equation.

ab is right. Carbon dioxide is an oxide of carbon and therefore contains carbon. Glucose and sucrose are both sugars, and sugars were formerly known as carbohydrates and contained carbon. Flour contains sugars and proteins, and contains carbon.

Equipped with X mol Fe for replacement Cu:

fe + cuso4 = feso4 + cu

x...x...x

Y mol Fe is provided for the reduction of Fe3+

fe + fe2(so4)3 = 3feso4

y...y...3y

Fully react to get the solution:

x+3y = =

Full reaction to obtain grams of solid precipitate:

6 - 56(x+y) +64x = ; 8x-56y=;>>x-7y =

y=, x=

1) The mass of copper formed after the reaction = 64x = 64* =

2) The amount of substance concentration of the original Fe2(SO4)3 solution = y (200 1000) = = mol l

Let the amount of copper that forms No2 be x, and the amount of copper that produces No2 is y

Cu + 4 Hno3 (concentrated) = Cu (No3) 2 + 2 No2 + 2H2O

x n(hno3) n(no2)

n(no2)=2x n(hno3) = 4x

3Cu + 8Hno3 dilute) = 2Cu (NO3) 2 + 2 No + 4H2O

y n(hno3) n(no)

n(no)=2y/3 n(hno3)=8y/3

The following equation can be obtained.

x+y=128 64 (conservation of copper).

2x+2y3= (Conservation of nitrogen).

x= i.e. volume of no2=

y= i.e. the volume of no =5*

The amount of the substance that consumes nitric acid = 4x + 8y 3 = 6mol

Let the cu involved in the reaction of concentrated nitric acid be x, and the cu participating in the reaction of dilute nitric acid be y

x+y=2;2y+2 3y=2, the solution of the resulting equation is the quantity of matter, and the conversion is what it is.

Equation ** is balanced by two chemical equations, where concentrated nitric acid is 14122 and dilute nitric acid is 38324 (in the equation, the coefficient of the substance).

3) Solution manifestation (alkaline). The reason for the above results is the expression of the ion equation (H2O+HCO3-=H2CO3+OH-).

2) The concentration of each ion in the solution is (Cl NH4+ H+ OH-) in descending order

The order of pH of the above five solutions from large to small is (4 5 3 2 1) The reason for the different depletion of (4) and (5) solutions is (because sodium hydroxide is directly ionized out of OH-ions, and sodium carbonate is OH-ions obtained by hydrolysis of bicarbonate, so the alkalinity is smaller than that of sodium hydroxide).

Question 1 Alkaline; H20+HCO3-===H2CO3+OH-Question 2 Cl->NH4+>H+>OH-

Question 3 45321

Question 4 Whether the alkalinity is the same mainly depends on the concentration of OH-, the production of OH- ions in 5 is reversible, so the concentration is less than 4

3) HCO3— +H2O=OH— +H2CO3 (H2CO3 is a weak acid)2)Cl— >NH4+ >H+ >OH—

pH order: NaOH> Na2CO3> NaHCO3>NH4Cl> Reasons why HNO3 are different:

There is a reversible reaction in Na2CO3 solution:

co3—+2h2o→h2co3+2oh—