Find a few chemistry questions in English, speed

I can help you translate, but after translating into Chinese, I can't do your topic well!! For example, question 11, what elements have good electrical and thermal conductivity? There are too many of them, and the average metal has.

12 Question: What do not have good electrical and thermal conductivity? There are too many. Generally non-metallic.

After 5 min, c(a)=3xmol l, c(b)=5xmol l, before the reaction, c(a)=(3x

c(b)=(5x

Yes. 3xx = 1) at this point a concentration.

c(a)=3xmol/l=

The pure standby concentration of a before the reaction.

c(a)=(3x

The amount of substances a, b before the reaction.

n(b)=n(a)=

2l=3mol

2) B's sail is flat and the leg is responsive.

v(b)=3)v(c)=2v(b),x=2

Al itself is as for the H+ reaction, but the reaction speed of sulfuric acid and eye soft is different, so it is necessary to consider the problem of anion, and the hypothesis put forward is that the presence of Cl makes the reaction between acid and aluminum easy to carry out. So you want to add substances containing Cl, and they don't react with Al themselves, you said that the activity of sodium is stronger than that of aluminum, so cations will not react with aluminum, so adding sodium chloride to sulfuric acid and aluminum can verify whether it is caused by Cl.

The addition of sodium chloride is not the addition of sodium but the addition of chloride ions, the experiment wants to prove the effect of adding chloride ions and not adding chloride ions on the reaction speed of aluminum and acid, if sodium chloride is added (containing chloride ions), the reaction between aluminum and acid is accelerated, indicating that the presence of chloride ions can accelerate the reaction of aluminum and acid.

However, with the addition of sodium sulfate (no chloride ions), the reaction between aluminum and acid does not change significantly, which proves that "the presence of chloride ions can accelerate the reaction between acid and aluminum".

There is no relationship between the activity of sodium.

Since it is conjectured that the presence of Cl- makes the reaction of acid and aluminum easy to proceed, then Cl- is added to see if there is a change in the reaction rate.

First of all, roughly turn the sand is sand or quartz sand Anyway, what does not affect the size of the quartz sand crystal, the volume of the crystal is 62nl (this unit has not been seen reference nanometer is understood as nanoliters, which is 10 (-9)l). If you were given a crystal of this quartz sand, assuming that all the quartz sand could be stacked together seamlessly, which of the following would be the closest to the volume that could hold these quartz sands?

You don't need to understand the options, you just need to know the numbers at the end.

If you do the math, it is na*62*10 (-9)=Probably choose C This is the closest to the C option is the total volume of the Caspian Sea.

The volume of a medium-sized grain of sand is 62 nlIf I give you the Avogadro constant of this grain of sand and assume that the sand is piled together, the gaps between the grains of sand are negligible. Which of the following options has about the same capacity for that much sand?

a, medium-sized forest pond with a volume of about 1x10 6 lb, Lake Mead (consisting of the Hoover Dam) with a volume of about lc, half the volume of the Caspian Sea, and a total volume of about L

d, all the oceans on the planet, with a total volume of about l

e, the volume of the Earth, the volume is about 1x10 24 l

1. The meaning of the problem is to find the names of noble gas elements that have the same electronic configuration of the two atoms that make up matter.

a The noble gases with the same electron configurations as Al3+ and S2- are Ne and Ar, respectively

b Mg2+ and N3- electrons have the same configuration, 2 8 structure, and the corresponding noble gas elements are Ne

c Cs+ and I- electron configurations are the same, 2 8 18 18 8 structure, and the corresponding noble gas elements are Xe

2. A f- is large and has 2 electron shells, and Li+ has only one electron shell.

b Cl- is large, Cl- has 3 electron shells, Na+ has only 2 electron shells.

C Ca is large, Ca has 4 electron shells, Ca2+ has only 3 electron shells.

d i- is larger, although they have the same electronic configuration (the same number of electrons outside the nucleus), but the number of protons of i- is less than cs+, and the attraction to extranuclear electrons is weaker, so the radius is larger.

1. C is wrong.

C refers to the oxide of rubidium and should be RB2O

2. a, f- larger. F- has 2 layers, while Li+ has only 1 layer B, Cl- is larger, Cl- has 3 layers, and Na+ has only 2 layers C, Ca loses 2 electrons and becomes Ca2+, so Ca is larger.

D. CS+ The structure of the electronic structure outside the nucleus is the same as that of i-, according to the larger the number of nuclear charges, the smaller the radius, so i- is larger.