Question

20. Визначте, які з реакцій відповідають реакціям окиснення 1.Mg+02 = Mgo 2. KClO3 = KCl+O2 02 ЗА + O2 = Al2O3 4 СН4 + O2 = CO2 + H2O 5. C2H5OH + O2 = CO2 + H2O варіанти відповідей тільки 13 тільки 4.5 Тільки 45.1 Тільки 5.2​

Answer 1

4 СН4 + O2 = CO2 + H2O

5. C2H5OH + O2 = CO2 + H2O

 відповідь 4.5

Answer 2

Reactions Corresponding to Oxidation Reactions:

1. Mg + O2 = MgO: - This is a redox reaction where magnesium (Mg) is oxidized to magnesium oxide (MgO) by reacting with oxygen (O2) gas. - The oxidation state of magnesium changes from 0 to +2, indicating oxidation. - The reaction can be balanced as follows: 2Mg + O2 = 2MgO [[1]].

2. KClO3 = KCl + O2: - This is also a redox reaction where potassium chlorate (KClO3) decomposes to form potassium chloride (KCl) and oxygen gas (O2). - The oxidation state of chlorine changes from +5 to -1, indicating reduction. - The reaction can be balanced as follows: 2KClO3 = 2KCl + 3O2 [[2]].

3. Zn + O2 = ZnO: - This reaction is not mentioned in the given options, but it is a common example of a redox reaction. - Zinc (Zn) is oxidized to zinc oxide (ZnO) by reacting with oxygen (O2) gas. - The oxidation state of zinc changes from 0 to +2, indicating oxidation. - The reaction can be balanced as follows: 2Zn + O2 = 2ZnO.

4. CH4 + 2O2 = CO2 + 2H2O: - This reaction is not mentioned in the given options, but it is another example of a redox reaction. - Methane (CH4) reacts with oxygen (O2) gas to produce carbon dioxide (CO2) and water (H2O). - The oxidation state of carbon changes from -4 to +4, indicating oxidation. - The reaction can be balanced as follows: CH4 + 2O2 = CO2 + 2H2O [[3]].

5. C2H5OH + 3O2 = 2CO2 + 3H2O: - This reaction is not mentioned in the given options, but it is also a redox reaction. - Ethanol (C2H5OH) reacts with oxygen (O2) gas to produce carbon dioxide (CO2) and water (H2O). - The oxidation state of carbon changes from -2 to +4, indicating oxidation. - The reaction can be balanced as follows: C2H5OH + 3O2 = 2CO2 + 3H2O [[4]].

Based on the given options, the reactions that correspond to oxidation reactions are 1. Mg + O2 = MgO and 5. C2H5OH + O2 = CO2 + H2O.