Question

Pb + O2 -- Na + O2 -- Al + O2 -- Ca + O2 -- Cu + O2

Answer 1

Ответ:

Pb + O2 = PbO2

2Na + O2 = 2Na2O

4Al + 3O2 = 2Al2O3

2Ca + O2 = 2CaO

2Cu + O2 = 2CuO

Прошу отметить ответ лучшим

Answer 2

The given expression represents a series of chemical reactions involving different elements reacting with oxygen. Let's break it down step by step:

1. Pb + O2: This represents the reaction between lead (Pb) and oxygen (O2). When lead reacts with oxygen, it forms lead(II) oxide (PbO). The balanced chemical equation for this reaction is:

2Pb + O2 -> 2PbO

2. Na + O2: This represents the reaction between sodium (Na) and oxygen (O2). When sodium reacts with oxygen, it forms sodium oxide (Na2O). The balanced chemical equation for this reaction is:

4Na + O2 -> 2Na2O

3. Al + O2: This represents the reaction between aluminum (Al) and oxygen (O2). When aluminum reacts with oxygen, it forms aluminum oxide (Al2O3). The balanced chemical equation for this reaction is:

4Al + 3O2 -> 2Al2O3

4. Ca + O2: This represents the reaction between calcium (Ca) and oxygen (O2). When calcium reacts with oxygen, it forms calcium oxide (CaO). The balanced chemical equation for this reaction is:

2Ca + O2 -> 2CaO

5. Cu + O2: This represents the reaction between copper (Cu) and oxygen (O2). When copper reacts with oxygen, it forms copper(II) oxide (CuO). The balanced chemical equation for this reaction is:

2Cu + O2 -> 2CuO

These reactions are examples of oxidation reactions, where the elements combine with oxygen to form oxides. Oxides are compounds that contain oxygen and another element. In each reaction, the oxygen molecule (O2) acts as the oxidizing agent, while the other element is oxidized.

It's important to note that the balanced chemical equations provided above are based on the stoichiometry of the reactions and represent the ratio of reactants and products.