chemistry lesson

Option I

Option II

1. Determine the Maximum number of elements:

№ 3, № 23

№ 20, № 43

2. Why are the elements located in the same group of Mendeleev's PSC III?

# 16 and # 24

# 17 and # 25

3. How does metallicity change?

in periods

in major subgroups

What is the reason?

Arrange the elements in descending order of metallicity

№ 23, 26, 20, 30, 19

№ 49, 13, 81, 31

4. Is it possible to completely dissolve the alloy in dilute sulfuric acid?

Ni, Si, Al, Mn

Cu, Fe, Zn, Cr

Give a reasonable answer. Draw up equations of chemical reactions.

5. Draw up equations of reactions of obtaining copper metals

from copper sulfide (II)

manganese from manganese oxide (IV)

The equation to figure out how IAB.

6. Is it safe to iron the design, if it is reinforced with bolts from

a) the lead-acid batterie.

b) manganese

a) zinc

b) Nickel

Give a reasonable answer.

7. Solve the transformation scheme. Write the equations of reactions

8. The solution to computational problems.

7 g of iron filings were added to a solution of copper (II) chloride weighing 135.0 g with W_CuCl2= 20%. Determine the mass of copper released as a result of the reaction.

Determine the mass of the formed salt at the interaction of 5.4 g of aluminum with sulfuric acid weighing 490.0 g, W_H2SO4= 10 %

Option I

Option II

They exhibit the same maximum CP +6, oxides have an acidic character, form strong acids:

SO₃— H₂SO₄; CGO₃-H₂CGO₄

3. In periods with increasing nuclear charge, the radius of the atom decreases — metallicity weakens:

K, CA, V, Fe, Zn.

4. Si is present in the composition of the alloy Si, it does not dissolve in sulfuric acid.

Metals Ni, Al, Mn in the stress series are located up to hydrogen. Interact with dilute H₂SO₄and displace hydrogen.

6. The iron structure will not be protected by lead, because iron is more active than lead and will be destroyed first, in the case of bolts made of manganese-the manganese will first be destroyed. However, in any case, the stability of the structure will be violated.

y = 0.25 mol CuCl₂ is required, and given 0.2 mol / CuCl СuСl₂is a disadvantage. The calculation is based on a lack.

They exhibit the same maximum CP +7, oxides have an acidic character, form strong acids:

SL₂O₇- Nclo₄; MP₂O₇– Nmpo₄

3. In groups, the main subgroups, the radius of the atom increases with increasing nuclear charge — metallicity increases:

Those In, Ja, Al.

4. The alloy contains Cu, which does not react with dilute sulfuric acid. In the series of stresses is located behind the hydrogen.

Metals Fe, Cr, Zn are located in the stress series up to hydrogen and displace hydrogen from the dilute H₂SO₄.

6. The iron structure will be protected by zinc, because zinc is more active than iron and will be destroyed first, in the case of Nickel, iron will first be destroyed, because it is more active than Nickel. But the stability of the structure will be violated in both cases.

y = 0.667 mol Andl is required, and given 0.2 mol ? Al is a drawback. The calculation is based on a lack.