Question

Хімія 7 клас Розставити коефіцієнти у хімічних рівняннях, вказати загальну суму коефіцієнтів у рівняннях, та зазначити реакцію сполучення та розкладу.1) ...HCl...+...Mg...< MgCl2 + H2^2) ...ZnO...+...HNO3<Zn (NO3)2 + H2OДопоможіть будь ласка... ​

Answer 1

1)  2HCI + Mg < MgCI2+H2

2) ZNO + 2HNO3 < Zn(NO3)2+H2O

Answer 2

Mg+2HCl=MgCl2+H2

ZnO+2HNO3=Zn(NO3)2+H2O

Answer 3

Balancing Chemical Equations

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

1) HCl + Mg → MgCl2 + H2

To balance this equation, we need to ensure that the number of atoms of each element is the same on both sides.

On the left side, we have: - 1 hydrogen (H) atom - 1 chlorine (Cl) atom - 1 magnesium (Mg) atom

On the right side, we have: - 2 chlorine (Cl) atoms - 1 magnesium (Mg) atom - 2 hydrogen (H) atoms

To balance the hydrogen atoms, we need to put a coefficient of 2 in front of HCl: 2HCl + Mg → MgCl2 + H2

Now, the hydrogen atoms are balanced. However, the chlorine atoms are not balanced yet. To balance the chlorine atoms, we need to put a coefficient of 2 in front of MgCl2: 2HCl + Mg → 2MgCl2 + H2

Now, both sides of the equation have: - 2 hydrogen (H) atoms - 4 chlorine (Cl) atoms - 1 magnesium (Mg) atom

The balanced equation is: 2HCl + Mg → 2MgCl2 + H2

The reaction is a combination reaction because two substances (HCl and Mg) combine to form a single compound (MgCl2) and hydrogen gas (H2).

2) ZnO + HNO3 → Zn(NO3)2 + H2O

On the left side, we have: - 1 zinc (Zn) atom - 1 oxygen (O) atom - 1 hydrogen (H) atom - 1 nitrogen (N) atom

On the right side, we have: - 2 nitrogen (N) atoms - 6 oxygen (O) atoms - 1 zinc (Zn) atom - 2 hydrogen (H) atoms

To balance the nitrogen atoms, we need to put a coefficient of 2 in front of