Question

1. Реакция, уравнение которой 2H₂O + 2Na=2NaOH + H₂ + Q , относится к реакциям:1) замещения, экзотермическим2) разложения, экзотермическим3) присоединения, эндотермическим4) обмена, эндотермическим2. Формула вещества, окрашивающего раствор лакмуса в красный цвет:1) LiOH 2) Cu(OH)₂ 3) H₂SO₄ 4) H₂O (я думаю 3)3. При попадении на кожу раствора кислоты:1)достаточно промыть место ожога большим количеством воды2)необходимо промыть место ожога большим количеством воды, затем 3%-ным раствором питьевой воды3)необходимо промыть место ожога большим количеством воды, затем 2%-ным раствором уксусной кислоты4)необходимо промыть место ожога большим количеством воды, затем протереть этиловым спиртом

Answer 1

1. замещение экзотермические
2.Н2SO4
3.достаточно промыть большим количеством воды

Answer 2

1. The reaction equation 2H₂O + 2Na = 2NaOH + H₂ + Q belongs to the category of exchange reactions. Exchange reactions involve the exchange of ions or atoms between reactants, resulting in the formation of new compounds. In this case, water (H₂O) and sodium (Na) react to form sodium hydroxide (NaOH), hydrogen gas (H₂), and release energy in the form of heat (Q) [[1]].

2. The substance that colors litmus solution red is H₂SO₄, which is sulfuric acid [[2]]. Litmus is a natural dye extracted from lichens and is commonly used as an indicator to determine the acidity or alkalinity of a solution. When litmus is added to an acidic solution, it turns red, indicating the presence of an acid.

3. When a solution of acid comes into contact with the skin, it is important to take appropriate measures to minimize harm. The correct response when acid comes into contact with the skin is to rinse the affected area with a large amount of water. This helps to dilute and remove the acid from the skin, reducing the risk of further damage [[3]]. It is important to note that using vinegar or ethyl alcohol (as mentioned in options 3 and 4) is not recommended, as they may not effectively neutralize the acid and could potentially cause further harm.

Please remember that in case of any emergency or serious injury, it is always advisable to seek immediate medical attention or contact the appropriate emergency services.

I hope this information is helpful! Let me know if you have any further questions.