Question

ZnO + 2HCl → ZnCl2 + H2O Mg + 2HCl → MgCl2 + H2 4Li + O2 → 2Li2O 2H2O2 → 2H2O + O2 ​

Answer 1

1)реакция обмена

2)реакция замещения

3)реакция соединения

4)реакция разложения

Answer 2

It seems like you've provided a list of chemical reactions. These reactions involve various elements and compounds undergoing chemical changes. Here's a brief explanation of each reaction:

1. Zinc Oxide (ZnO) and Hydrochloric Acid (HCl): ZnO reacts with HCl to produce Zinc Chloride (ZnCl2) and water (H2O).

2. Magnesium (Mg) and Hydrochloric Acid (HCl): Magnesium reacts with HCl to produce Magnesium Chloride (MgCl2) and hydrogen gas (H2).

3. Lithium (Li) and Oxygen (O2): Four lithium atoms react with one oxygen molecule (O2) to form two molecules of lithium oxide (Li2O).

4. Hydrogen Peroxide (H2O2): Hydrogen peroxide decomposes into water (H2O) and oxygen gas (O2). This reaction is often catalyzed by substances like manganese dioxide (MnO2).

These reactions involve the rearrangement of atoms and molecules to form new substances. The coefficients in front of the compounds indicate the stoichiometry of the reaction, representing the relative quantities of reactants and products. If you have any specific questions about these reactions or related concepts, feel free to ask!