Question

Перепишите приведенные ниже схемы химических реакций в тетрадь, расставьте коэффициенты и укажите, к какому типу можно отнести каждую химическую реакцию. Заранее спасибо большое! 1) MgCO3-> MgO+CO2 2) Mg+HCL-> MgCL2 + H2 3) AL+ S-> AL2S34) MgCL2+NaOH->Mg(OH)2+ NaCLИ пожалуйста объясните как это решать:)спасибо огромное

Answer 1

1) MgCO3 = MgO + CO2 - реакция разложения
2) Mg + 2HCl = MgCl2 + H2 - реакция замещения
3) 2Al + 3S = Al2S3 - реакция соединения
4) MgCl2 + 2NaOH = Mg(OH)2 + 2NaCl - реакция обмена

Answer 2

Chemical Reactions and Balancing Equations

To solve the given chemical reactions and balance the equations, we need to follow a few steps. Let's go through each reaction one by one and determine the type of reaction and balance the equations.

1) MgCO3 -> MgO + CO2

This is a decomposition reaction, where a single compound breaks down into two or more simpler substances. In this case, magnesium carbonate (MgCO3) decomposes into magnesium oxide (MgO) and carbon dioxide (CO2).

To balance the equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation. Let's balance it step by step:

MgCO3 -> MgO + CO2

We start by balancing the magnesium (Mg) atoms. There is one Mg atom on the left side and one on the right side, so it is already balanced.

Next, let's balance the carbon (C) atoms. There is one C atom on the left side and one on the right side, so it is also balanced.

Finally, let's balance the oxygen (O) atoms. There is one O atom on the left side (from CO3) and one on the right side (from MgO). However, there are three O atoms on the left side (from CO3), so we need to balance it by adding a coefficient of 3 in front of MgO.

The balanced equation is:

MgCO3 -> MgO + CO2 [[1]]

2) Mg + HCl -> MgCl2 + H2

This is a single replacement reaction, where an element replaces another element in a compound. In this case, magnesium (Mg) reacts with hydrochloric acid (HCl) to form magnesium chloride (MgCl2) and hydrogen gas (H2).

To balance the equation, let's follow the same steps:

Mg + HCl -> MgCl2 + H2

First, let's balance the magnesium (Mg) atoms. There is one Mg atom on the left side and one on the right side, so it is already balanced.

Next, let's balance the hydrogen (H) atoms. There are two H atoms on the left side (from HCl) and two on the right side (from H2), so it is balanced.

Finally, let's balance the chlorine (Cl) atoms. There is one Cl atom on the left side (from HCl) and two on the right side (from MgCl2). To balance it, we need to add a coefficient of 2 in front of HCl.

The balanced equation is:

Mg + 2HCl -> MgCl2 + H2 [[2]]

3) Al + S -> Al2S3

This is a synthesis reaction, where two or more substances combine to form a single compound. In this case, aluminum (Al) reacts with sulfur (S) to form aluminum sulfide (Al2S3).

To balance the equation, let's follow the same steps:

Al + S -> Al2S3

First, let's balance the aluminum (Al) atoms. There is one Al atom on the left side and two on the right side, so we need to add a coefficient of 2 in front of Al.

Next, let's balance the sulfur (S) atoms. There is one S atom on the left side and three on the right side (from Al2S3). To balance it, we need to add a coefficient of 3 in front of S.

The balanced equation is:

2Al + 3S -> Al2S3 [[3]]

4) MgCl2 + NaOH -> Mg(OH)2 + NaCl

This is a double replacement reaction, where the positive ions of two compounds switch places. In this case, magnesium chloride (MgCl2) reacts with sodium hydroxide (NaOH) to form magnesium hydroxide (Mg(OH)2) and sodium chloride (NaCl).

To balance the equation, let's follow the same steps:

MgCl2 + NaOH -> Mg(OH)2 + NaCl

First, let's balance the magnesium (Mg) atoms. There is one Mg atom on the left side and one on the right side, so it is already balanced.

Next, let's balance the chlorine (Cl) atoms. There are two Cl atoms on the left side (from MgCl2) and one on the right side (from NaCl). To balance it, we need to add a coefficient of 2 in front of NaCl.

Finally, let's balance the hydrogen (H) and oxygen (O) atoms. There are two H atoms and two O atoms on the left side (from NaOH) and two H atoms and two O atoms on the right side (from Mg(OH)2). Therefore, they are already balanced.

The balanced equation is:

MgCl2 + 2NaOH -> Mg(OH)2 + 2NaCl [[4]]

I hope this helps! Let me know if you have any further questions.