Question

2 4.3 Допиши рівняння реакцій, добери коефіцієнти. Ca + _0₂ = _H2 + ___ O2 = IV Si + _0₂= ― V P + __ O2 =

Answer 1

Відповідь:

2Ca+O2=2CaO

2H2+O2=2H2O

Si+O2=SiO2

4P+5O2=2P2O5

Пояснення:

Answer 2

Balancing Chemical Equations

To balance the given chemical equations, we need to ensure that the number of atoms of each element is the same on both sides of the equation. Let's balance each equation step by step:

1. Ca + O₂ → CaO₂ - The equation is already balanced because there is only one atom of each element on both sides.

2. H₂ + O₂ → H₂O - To balance the equation, we need to ensure that the number of hydrogen (H) and oxygen (O) atoms is the same on both sides. - Let's start by balancing the hydrogen atoms. There are 2 hydrogen atoms on the left side, so we need to put a coefficient of 2 in front of H₂ on the right side: H₂ + O₂ → 2H₂O. - Now let's balance the oxygen atoms. There are 2 oxygen atoms on the left side and 4 oxygen atoms on the right side. To balance them, we need to put a coefficient of 2 in front of O₂ on the left side: 2H₂ + 2O₂ → 2H₂O.

3. Si + O₂ → SiO₂ - The equation is already balanced because there is only one atom of each element on both sides.

4. P + O₂ → P₂O₅ - To balance the equation, we need to ensure that the number of phosphorus (P) and oxygen (O) atoms is the same on both sides. - Let's start by balancing the phosphorus atoms. There is 1 phosphorus atom on the left side, so we need to put a coefficient of 2 in front of P on the right side: P + O₂ → 2P₂O₅. - Now let's balance the oxygen atoms. There are 2 oxygen atoms on the left side and 10 oxygen atoms on the right side. To balance them, we need to put a coefficient of 5 in front of O₂ on the left side: P + 5O₂ → 2P₂O₅.

Here are the balanced chemical equations:

1. Ca + O₂ → CaO₂ 2. 2H₂ + 2O₂ → 2H₂O 3. Si + O₂ → SiO₂ 4. P + 5O₂ → 2P₂O₅

Please note that the coefficients in front of the chemical formulas represent the number of molecules or moles needed to balance the equation.