Question

Определите валентностт элементов в укащанных оксидах, запишите их названия: К2О,СаО,Р2О3,NO2,I2O5,SO3,CI2O7.

Answer 1

Valence of Elements in the Given Oxides and Their Names:

To determine the valence of elements in the given oxides and write their names, we need to analyze the chemical formulas of each oxide.

1. K2O: - The chemical formula K2O indicates that this oxide contains potassium (K) and oxygen (O) elements. - Potassium (K) is an alkali metal and typically has a valence of +1. - Oxygen (O) is a non-metal and typically has a valence of -2. - Therefore, the valence of potassium in K2O is +1, and the valence of oxygen is -2. - The name of this oxide is potassium oxide.

2. CaO: - The chemical formula CaO indicates that this oxide contains calcium (Ca) and oxygen (O) elements. - Calcium (Ca) is an alkaline earth metal and typically has a valence of +2. - Oxygen (O) is a non-metal and typically has a valence of -2. - Therefore, the valence of calcium in CaO is +2, and the valence of oxygen is -2. - The name of this oxide is calcium oxide.

3. P2O3: - The chemical formula P2O3 indicates that this oxide contains phosphorus (P) and oxygen (O) elements. - Phosphorus (P) is a non-metal and can have multiple valences. - Oxygen (O) is a non-metal and typically has a valence of -2. - To determine the valence of phosphorus, we can use the fact that the overall charge of the compound is neutral. - Since there are two phosphorus atoms, each phosphorus atom must have a valence of +3 to balance the -2 valence of oxygen. - Therefore, the valence of phosphorus in P2O3 is +3, and the valence of oxygen is -2. - The name of this oxide is phosphorus(III) oxide.

4. NO2: - The chemical formula NO2 indicates that this oxide contains nitrogen (N) and oxygen (O) elements. - Nitrogen (N) is a non-metal and can have multiple valences. - Oxygen (O) is a non-metal and typically has a valence of -2. - To determine the valence of nitrogen, we can use the fact that the overall charge of the compound is neutral. - Since there is one nitrogen atom, it must have a valence of +4 to balance the -2 valence of oxygen. - Therefore, the valence of nitrogen in NO2 is +4, and the valence of oxygen is -2. - The name of this oxide is **nitrogen(IV