Question

Определите и обозначьте римскими цифрами валентности элементов по водороду и кислороду в соединениях, состав которых выражен формулами: HBr, H2S, PH3, SiH4, ZnO, P2O3, SO2, SO3

Answer 1

HBr: H(I), Br(I)
H2S: H(I), S(II)
PH3: P(III), H(I)
SiH4: Si(IV), H(I)
ZnO: Zn(II), O(II)
P2O3: P(III), O(II)
SO2: S(IV), O(II)
SO3: S(VI), O(II)

Answer 2

Roman Numerals for Elements in Compounds

To determine the Roman numerals for the elements in compounds, we need to know the valence or oxidation state of each element. The valence of an element indicates the number of electrons it gains, loses, or shares when it forms a compound.

Here are the Roman numerals for the elements in the compounds you provided:

1. HBr (Hydrogen Bromide): - Hydrogen (H) has a valence of +1. - Bromine (Br) has a valence of -1. - Therefore, the Roman numerals for the elements in HBr are H(I)Br(I).

2. H2S (Hydrogen Sulfide): - Hydrogen (H) has a valence of +1. - Sulfur (S) has a valence of -2. - Therefore, the Roman numerals for the elements in H2S are H(I)S(II).

3. PH3 (Phosphine): - Phosphorus (P) has a valence of -3. - Hydrogen (H) has a valence of +1. - Therefore, the Roman numerals for the elements in PH3 are P(III)H(I).

4. SiH4 (Silane): - Silicon (Si) has a valence of -4. - Hydrogen (H) has a valence of +1. - Therefore, the Roman numerals for the elements in SiH4 are Si(IV)H(I).

5. ZnO (Zinc Oxide): - Zinc (Zn) has a valence of +2. - Oxygen (O) has a valence of -2. - Therefore, the Roman numerals for the elements in ZnO are Zn(II)O(II).

6. P2O3 (Phosphorus Trioxide): - Phosphorus (P) has a valence of +3. - Oxygen (O) has a valence of -2. - Therefore, the Roman numerals for the elements in P2O3 are P(III)O(II).

7. SO2 (Sulfur Dioxide): - Sulfur (S) has a valence of +4. - Oxygen (O) has a valence of -2. - Therefore, the Roman numerals for the elements in SO2 are S(IV)O(II).

8. SO3 (Sulfur Trioxide): - Sulfur (S) has a valence of +6. - Oxygen (O) has a valence of -2. - Therefore, the Roman numerals for the elements in SO3 are S(VI)O(II).

Please note that the Roman numerals indicate the valence or oxidation state of the elements in the compounds and are not part of the compound's chemical name.