Question

Самостоятельная работа по теме: «Степень окисления. ОВР» 3 вариант 1. Определите степени окисления каждого химического элемента в соединении: K2Cr2O7, N2, CO, Ca3(PO4)2, Cu 2. Укажите переход электронов схеме, определите окислитель-восстановитель: 1) Mn+7 → Mn+2 2) Mn+7 → Mn0 3) N-3 → N+5 3. Уравнять методом электронного баланса: 1) Al + HNO3 → Al(NO3)3 + H2O + NO 2) Na2SO3 + Cl2 + H2O → NaCl + H2SO4 3) Na2S + HNO3 → S + NO2 + H2O + NaNO3

Answer 1

Ответ:

Не благодари.......)

Answer 2

Stepeni Okisleniya (Степень окисления) and OVR (ОВР)

Степень окисления (Stepeni Okisleniya) is a term used in chemistry to describe the oxidation state or number of an atom in a compound. It represents the hypothetical charge that an atom would have if all its bonds were 100% ionic. ОВР (OVR) stands for "Oxidation-Reduction Reactions" in Russian.

Let's go through each compound and determine the oxidation state of each element:

1. K2Cr2O7: - The oxidation state of potassium (K) is +1 since it is an alkali metal. - The oxidation state of oxygen (O) is -2, as it usually is in compounds. - Let the oxidation state of chromium (Cr) be x. - We can set up the equation: 2(1) + 2(x) + 7(-2) = 0 (since the compound is neutral). - Solving the equation, we find that x = +6. - Therefore, the oxidation state of chromium in K2Cr2O7 is +6.

2. N2: - Nitrogen (N) is a diatomic molecule, so each nitrogen atom shares its electrons equally. - Therefore, the oxidation state of each nitrogen atom in N2 is 0.

3. CO: - The oxidation state of oxygen (O) is -2. - Let the oxidation state of carbon (C) be x. - We can set up the equation: x + 2(-2) = 0. - Solving the equation, we find that x = +2. - Therefore, the oxidation state of carbon in CO is +2.

4. Ca3(PO4)2: - The oxidation state of calcium (Ca) is +2. - The oxidation state of oxygen (O) is -2. - Let the oxidation state of phosphorus (P) be x. - We can set up the equation: 3(2) + x + 4(-2) = 0. - Solving the equation, we find that x = +5. - Therefore, the oxidation state of phosphorus in Ca3(PO4)2 is +5.

5. Cu: -