Ask high school 1 chemistry questions, ask high school chemistry questions?

According to the conservation of electron gain and loss, the more H2 is obtained, the more electrons the metal loses.

Then the number of electrons lost by each metal is in the following order: 2*m 56=m 28; 2*m/65=m/;3*m/27=m/9;1*m/23=m/23

Comparing the size of the denominator, it can be seen that the number of lost electrons is al, na, fe, zn, and the order is also the order of how much h2 is released.

Or you can calculate it according to the equation.

If HCl is completely reacted, the amount of NaOH = 1mol or 40g.

If you find the percentage content, that is, 40 50 * 100% = 80%.

1. Set n grams.

Then n 56 mol Fe corresponds to n 56 mol H2n 64 mol zn corresponds to n 96 mol H2n 27 mol al corresponds to 2n 81 mol H2n 23 mol na corresponds to n 46 mol H2, so the order is, al, na, fe, zn

2,1 mol HCl corresponds to 1 mol of NaOH in the reaction, then the sample contains 40 grams of NaOH, 80%.

Won't add me 361408965"I'm a senior in high school".

From the inscription, the total reaction formula of lead-acid battery discharge is:

Pb+PBO2+2H2SO4=2PBSo4+2H2O Intraphase transfer electrons 2E-

n（cu）=

cu~2e-~2h2so4

n（h2so4）=2n（cu）=

You don't seem to have completed all 2 questions.

It is the oxygen absorption corrosion of iron, which is a kind of electrochemical corrosion of metal.

Negative electrode: 2fe-4e-=2fe2+

Positive electrode: 2H2O+O2+4E-=4OH-

Total: 2Fe + O2 + 2H2O = 4Fe(Oh)2 and then reacts with O2.

4Fe(OH)2+O2+2H2O=4Fe(OH)3Fe(OH)3Fe(OH)3 is lost water to produce Fe2O3 brownish-red.

Oh my God! I'm a chemistry class representative, and I'd love to give you an answer, but I'm only in my third year of junior high school. I can't help it. But I can still understand the chemical formulas you said, and what I want to tell you is your sulfate ion. I really don't know you if you're not serious!

Brother didn't graduate from high school, I can't help...

What is the chemical formula?

fecl2·h2o

2.Equation for all examples of the precipitation of red loose solids by putting an aluminum sheet into d?

2Al+ 6H+ =2Al3+ +3H2 Fe2+ +2H2O <==>Fe(OH)2 + 2H+4Fe(Oh)2+O2+2H2O=4Fe(Oh)3Al and H+ react, thereby consuming H+, causing the first reaction to move forward, so that the white Fe(Oh)2 is precipitated, and Fe(Oh)2 reacts with O2 and H2O to form red Fe(Oh)3

3.The reason for the formation of bubbles in the aluminum sheet in D (with ion equation) 2Al+ 6H+ =2Al3+ +3H2 The reason for the formation of a, b, and C by heating and burning (combined with the necessary text and equation explanation) FeCl2·H2O will be hydrolyzed, Fe2+ +2H2O <==>Fe(OH)2 + 2H+

Heating causes the equilibrium to move in a positive direction, so H+ and Cl- combine to form HCl, i.e., A and heating and burning will decompose Fe(Oh)2, Fe(Oh)2==High temperature==FeO+H2O

So B is FEO and C is H2O

1) Solution: (1) Let the mass of sodium hydroxide be X, the mass of chlorine is Y, and the mass of hydrogen is Z2NaCl+2H O (energized)2NaOH+Cl+H 1170kg x Y Z

117 1170kg=80 x solution, x=800kg117 1170kg=71 y solution, y=710kg117 1170kg=2 z solution, z=20kg2) cl +h 2hcl

Their mass ratio is: 71:2:73 71+2=73So, according to the law of conservation of mass, it can theoretically be produced: 710kg+20kg=730kg.

Extrapolated by chemical equations.

The kinetic friction factor is.

Then the acceleration on the conveyor belt is 1 (the unit refers to the tan belt), when the velocity of the object is 2m s, Xingwei digs 1 2 (at 2) = 2m t = (2m s) a (acceleration) = 2s

After that, it does a uniform linear motion with the conveyor belt, t=(18m) and loose (2ms)=9s

So it took a total of 11s

a=ug=1m s2 2s to reach the height of the head of the block 2m s to do a constant velocity, at this time the distance traveled is 1 2at2=2m and the other end is 18m. Use 9s to reach the celery.

Total time = 2 + 9 = 11s

d This is a static equilibrium problem, and the external force of the equilibrium object is zero.

Vector synthesis adheres to the parallelogram rule.

Analysis of the force at point O.

The F1 direction is along the BO upwards, and the F2 direction is along the AO to the right.

The rope pull force is straight down, which is equal to the gravitational force of the object.

The resultant force of f1 and f2 must be vertically upwards and is in the opposite direction of the object's gravity.

Draw a vector synthesis diagram (synthesis of forces).

From the geometric relationship, we can see that f1=mg tan and f2=mg cos