Question

Al+O2 HNO3+CuO K+H2O Cr(OH)2

Answer 1

4Al+3O2==> 2Al2O3 ( обычное окисление в-в)

2HNO3+ CuO ==> Cu(NO3)2 + H2O ( качественная реакция кислоты и основного оксида)

2K+ 2 H2O ==> 2KOH + H2 ( получение гидроксида активного металла при смешивании с водой и выделением Н2)

Cr(OH)2 ==> CrO+ H2O ( хром среднеактивный металл, гидроксид разлагается на оксид и водичку)

Answer 2

The given list consists of chemical formulas for different compounds. Here's some information about each one:

1. Al + O2: This is a chemical equation for a reaction between aluminum (Al) and oxygen (O2). When aluminum reacts with oxygen, it forms aluminum oxide (Al2O3).

2. HNO3 + CuO: This is a chemical equation for a reaction between nitric acid (HNO3) and copper oxide (CuO). When nitric acid reacts with copper oxide, it forms copper nitrate (Cu(NO3)2) and water (H2O).

3. K + H2O: This is a chemical equation for a reaction between potassium (K) and water (H2O). When potassium reacts with water, it forms potassium hydroxide (KOH) and hydrogen gas (H2).

4. Cr(OH)2: This is the chemical formula for chromium(II) hydroxide, which is a compound that consists of chromium, oxygen, and hydrogen.

Note: It is important to note that these chemical reactions and compounds are written in a simplified form and may not represent the full complexity of the actual chemical reactions or compounds.