Question

1. Расставьте коэффициенты в таких схемах реакций: Мg + HCl → Мg Cl2 + H2 Сa + О2 → СaО; КNО3 → КNО2 + О2; АgВг → Аg + Вг2; Li + Н2О → LiОН + Н2.

Answer 1

Мg + 2HCl → Мg Cl2 + H2 
2Сa + О2 → 2СaО; 
2КNО3 → 2КNО2 + О2; 
2АgВг → 2Аg + Вг2; 
2Li + 2Н2О → 2LiОН + Н2.

Answer 2

Coefficients in Chemical Reactions

In chemical reactions, coefficients are used to balance the equation and represent the relative amounts of reactants and products involved. Let's go through the given reactions and determine the coefficients for each reactant and product.

1. Mg + HCl → MgCl2 + H2 - The reaction involves magnesium (Mg) and hydrochloric acid (HCl) producing magnesium chloride (MgCl2) and hydrogen gas (H2). - To balance the equation, we need to ensure that the number of atoms on both sides of the equation is equal. - The balanced equation is: Mg + 2HCl → MgCl2 + H2 [[1]].

2. Ca + O2 → CaO - The reaction involves calcium (Ca) and oxygen (O2) producing calcium oxide (CaO). - To balance the equation, we need to ensure that the number of atoms on both sides of the equation is equal. - The balanced equation is: 2Ca + O2 → 2CaO [[2]].

3. KNO3 → KNO2 + O2 - The reaction involves potassium nitrate (KNO3) producing potassium nitrite (KNO2) and oxygen gas (O2). - To balance the equation, we need to ensure that the number of atoms on both sides of the equation is equal. - The balanced equation is: 2KNO3 → 2KNO2 + O2 [[3]].

4. AgBr → Ag + Br2 - The reaction involves silver bromide (AgBr) producing silver (Ag) and bromine gas (Br2). - To balance the equation, we need to ensure that the number of atoms on both sides of the equation is equal. - The balanced equation is: 2AgBr → 2Ag + Br2 [[4]].

5. Li + H2O → LiOH + H2 - The reaction involves lithium (Li) and water (H2O) producing lithium hydroxide (LiOH) and hydrogen gas (H2). - To balance the equation, we need to ensure that the number of atoms on both sides of the equation is equal. - The balanced equation is: 2Li + 2H2O → 2LiOH + H2 [[5]].

Please note that the coefficients provided above are the balanced coefficients for each reaction.