Question

ПОМОГИТЕ ПОЖАЛУЙСТА Выбери верные утверждения: не все реакции требуют нагревания все реакции сопровождаются выделением света обязательное условие протекания реакции — изменение агрегатного состояния веществ выделение газа — признак химической реакции

Answer 1

Ответ:

Обязательное условие протекания реакции-изменение агрегатного состояние ведеств выделееия газа- признак химической реакции

Answer 2

Types of Chemical Reactions

Chemical reactions are processes in which substances, known as reactants, are transformed into different substances, called products. These reactions can occur under various conditions and can be classified into different types based on their characteristics. Let's examine the statements provided and determine which ones are correct.

1. Not all reactions require heating: While some reactions do require heating to initiate or speed up the reaction, not all reactions need heat. Some reactions can occur at room temperature or even at lower temperatures. For example, the reaction between baking soda and vinegar produces carbon dioxide gas without the need for heating.

2. Not all reactions involve the emission of light: While some reactions do produce light as a byproduct, not all reactions are accompanied by the emission of light. Light emission is often observed in reactions involving combustion or certain types of chemical reactions, such as chemiluminescence. However, many reactions do not produce visible light.

3. Change in the state of matter is not a mandatory condition for a reaction: A change in the state of matter, such as the conversion of a solid to a liquid or a gas, can occur during a chemical reaction. However, it is not a mandatory condition for a reaction to take place. Many reactions occur without any noticeable change in the state of matter.

4. Gas evolution can be a sign of a chemical reaction: The release or evolution of gas can be an indicator of a chemical reaction. When certain reactants combine, they may produce a gas as one of the products. For example, the reaction between baking soda and vinegar produces carbon dioxide gas, which is evident by the formation of bubbles.

Based on the above analysis, the correct statements are:

- Not all reactions require heating. - Gas evolution can be a sign of a chemical reaction.

It is important to note that these statements are generalizations and may have exceptions depending on specific reactions and conditions.