Question

Задание 2. Может ли измениться число атомов после реакции? Может ли измениться число молекул после реакции? Дайте обоснованный ответ

Answer 1

Ответ:

Нет, не может.

Объяснение:

Закон сохранения массы веществ гласит, что масса веществ, вступивших в реакцию, равна массе образовавшихся веществ. С точки зрения атомно-молекулярного учения этот закон объясняется тем, что при химических реакциях общее количество атомов не изменяется, а происходит лишь их перегруппировка.

Если просто: ничего не уходит в никуда и не появляется из ничего.

Количество молекул может измениться, так как молекулы собираются из атомов и сложность сборки молекул разная.

Answer 2

Can the number of atoms change after a reaction?

Yes, the number of atoms can change after a reaction. In a chemical reaction, atoms are rearranged to form new substances. The reactants, which are the substances present before the reaction, combine and undergo chemical changes to form products, which are the substances formed after the reaction. During this process, the atoms from the reactants are rearranged to form new molecules or compounds.

For example, let's consider the reaction between hydrogen gas (H2) and oxygen gas (O2) to form water (H2O). In this reaction, two molecules of hydrogen gas react with one molecule of oxygen gas to produce two molecules of water. The reaction can be represented by the following equation:

2H2 + O2 -> 2H2O

In this reaction, the number of hydrogen atoms and oxygen atoms on the reactant side is different from the number of hydrogen atoms and oxygen atoms on the product side. Before the reaction, there are four hydrogen atoms (2 atoms in each H2 molecule) and two oxygen atoms (1 atom in each O2 molecule). After the reaction, there are four hydrogen atoms (2 atoms in each H2O molecule) and two oxygen atoms (1 atom in each H2O molecule). Therefore, the number of atoms has changed after the reaction.

Can the number of molecules change after a reaction?

Yes, the number of molecules can change after a reaction. In a chemical reaction, the reactant molecules combine and undergo chemical changes to form product molecules. The number of molecules on the reactant side may be different from the number of molecules on the product side.

Using the same example as before, the reaction between hydrogen gas (H2) and oxygen gas (O2) to form water (H2O) involves a change in the number of molecules. Before the reaction, there are two molecules of hydrogen gas and one molecule of oxygen gas. After the reaction, there are two molecules of water. Therefore, the number of molecules has changed after the reaction.

It's important to note that the conservation of mass and the law of conservation of atoms still apply in chemical reactions. This means that while the number of atoms and molecules may change, the total number of atoms and the total mass of the substances involved in the reaction remain constant.