Question

Допоможіть за сьгодні. Розтавте кофіеціенти в схемах хімічних реакцій. Вказати реакції розпаду і сполучення: Cu+O2=CuO,AgBr =Ag + Br2,KNO3=KNO2+O2Na2O+H2O=NaOH

Answer 1

Объяснение:

коефициенты обозначены жирным шрифтом

4Cu+O2=2Cu2O

2AgBr= 2Ag+Br2

2KNO3=2KNO2+O2

Na2O+H20=2NaOH

Answer 2

#### Coefficients in Chemical Reactions When balancing chemical equations, coefficients are used to ensure that the number of atoms of each element is the same on both sides of the equation. Let's balance the given chemical reactions and identify the reactions of decomposition and combination. 1. **Cu + O2 = CuO** (Reaction 1: Copper and Oxygen react to form Copper(II) Oxide) To balance this equation, we need to ensure that the number of atoms of each element is the same on both sides. Here's the balanced equation: ``` 2Cu + O2 = 2CuO ``` This reaction represents the combination of Copper and Oxygen to form Copper(II) Oxide. 2. **AgBr = Ag + Br2** (Reaction 2: Silver Bromide decomposes to form Silver and Bromine) To balance this equation, we need to ensure that the number of atoms of each element is the same on both sides. Here's the balanced equation: ``` 2AgBr = 2Ag + Br2 ``` This reaction represents the decomposition of Silver Bromide into Silver and Bromine. 3. **KNO3 = KNO2 + O2** (Reaction 3: Potassium Nitrate decomposes to form Potassium Nitrite and Oxygen) To balance this equation, we need to ensure that the number of atoms of each element is the same on both sides. Here's the balanced equation: ``` 2KNO3 = 2KNO2 + O2 ``` This reaction represents the decomposition of Potassium Nitrate into Potassium Nitrite and Oxygen. 4. **Na2O + H2O = NaOH** (Reaction 4: Sodium Oxide reacts with Water to form Sodium Hydroxide) To balance this equation, we need to ensure that the number of atoms of each element is the same on both sides. Here's the balanced equation: ``` Na2O + H2O = 2NaOH ``` This reaction represents the combination of Sodium Oxide and Water to form Sodium Hydroxide. In summary, the given reactions involve both decomposition and combination processes. The balanced equations are as follows: 1. Reaction 1: **2Cu + O2 = 2CuO** 2. Reaction 2: **2AgBr = 2Ag + Br2** 3. Reaction 3: **2KNO3 = 2KNO2 + O2** 4. Reaction 4: **Na2O + H2O = 2NaOH** Please let me know if there's anything else I can help you with!