Question

2. Какая из химических реакций происходит быстрее? А. взрыв метана б .скисание молока В.образование сталактитов г.горение каменного угля 3. Укажите химическое явление A.застывание сплава Б.сплав железа с серой. В.кристаллизация соли из раствора. г.высыхания белья 4. Какой металлический элемент превращает простой тризарядний катион? А.калий Б.Алюминий В.кальций г.магний 5. Укажите утверждение, что описывает химическую реакцию между водородом и железа (III) оксидом а. продукты- простые и сложные вещества б. продукты-сложные вещества В реагенты-два сложных вещества г.реагентов-два простых вещества 6. Укажите сложное вещество. А манґан б водород В азот г.етан 7. Добавить перечень, содержащий только р-элементы.1) Be: 2)Al 3)Cr 4)K 5)F 6)P A 2: 5: 6 Б 1: 3 В 1: 3: 5 Г 2: 6

Answer 1

2) а

3) б

4) б

5) а

6) г

7) г

Answer 2

Which chemical reaction occurs faster?

The speed of a chemical reaction can vary depending on various factors such as temperature, concentration, and catalysts. However, in general, the reaction that occurs faster is the one with a higher reaction rate.

A. Methane explosion vs. Milk souring: The explosion of methane is typically a rapid reaction due to the high reactivity of methane gas. On the other hand, the souring of milk is a slower process caused by the growth of bacteria that convert lactose into lactic acid. Therefore, the explosion of methane is likely to occur faster than the souring of milk.

Chemical phenomenon:

A. Solidification of an alloy: The solidification of an alloy refers to the process of transforming a molten alloy into a solid state. This is a chemical phenomenon that involves the rearrangement of atoms or ions to form a solid structure. Therefore, the solidification of an alloy can be considered a chemical reaction.

Metal element and trivalent cation:

B. Aluminum (Al): Aluminum is a metal element that can form a trivalent cation (Al3+) by losing three electrons. Therefore, aluminum is capable of transforming a simple trivalent cation.

Chemical reaction between hydrogen and iron (III) oxide:

B. The products are complex substances: In the chemical reaction between hydrogen and iron (III) oxide, the products formed are complex substances. Iron (III) oxide (Fe2O3) reacts with hydrogen (H2) to produce iron (Fe) and water (H2O). Therefore, the correct statement is that the products are complex substances.

Complex substance:

A. Manganese (Mn): Manganese is a chemical element that exists as a complex substance. It is a transition metal that forms various compounds and complexes.

List of elements:

The list containing only "p-block" elements is as follows: 1) Be (Beryllium) 3) Cr (Chromium) 5) F (Fluorine) 6) P (Phosphorus)

Therefore, the correct option is B. 1:3.