Question

Расставьте коэффициенты и определите тип реакции (стр.69) а) Fe + O2 = Fe3O4 ; в) AgNO3 + AlCl3 = AgCl + Al(NO3)3 б) Al2(CO3)3 = Al2O3 + CO2; г) Zn + H3PO4 = Zn3(PO4)2 + H2

Answer 1

а) 3Fe+2O2=Fe3O4- реакция соединения

б)  Al2(CO3)3=Al2O3+3CO2- реакция разложения

в) 3AgNO3+AlCl3=3AgCl+Al(NO3)3= реакция обмена

г) 3Zn+2H3PO4=Zn3(PO4)2+3H2- реакция замещения

Answer 2

Reaction Types and Balancing Equations

To determine the reaction type and balance the equations given on page 69, we need to consider the reactants and products involved. Let's analyze each equation one by one:

a) Fe + O2 = Fe3O4

This equation represents the reaction between iron (Fe) and oxygen (O2) to form iron(II,III) oxide (Fe3O4). The coefficients for this balanced equation are:

4 Fe + 3 O2 = 2 Fe3O4 [[1]]

The reaction type for this equation is a synthesis reaction, where two or more substances combine to form a single compound.

b) AgNO3 + AlCl3 = AgCl + Al(NO3)3

This equation represents the reaction between silver nitrate (AgNO3) and aluminum chloride (AlCl3) to form silver chloride (AgCl) and aluminum nitrate (Al(NO3)3). The coefficients for this balanced equation are:

3 AgNO3 + AlCl3 = 3 AgCl + Al(NO3)3 [[2]]

The reaction type for this equation is a double displacement reaction, where the positive ions of two compounds exchange places.

c) Al2(CO3)3 = Al2O3 + CO2

This equation represents the decomposition of aluminum carbonate (Al2(CO3)3) into aluminum oxide (Al2O3) and carbon dioxide (CO2). The coefficients for this balanced equation are:

Al2(CO3)3 = Al2O3 + 3 CO2 [[3]]

The reaction type for this equation is a decomposition reaction, where a single compound breaks down into two or more simpler substances.

d) Zn + H3PO4 = Zn3(PO4)2 + H2

This equation represents the reaction between zinc (Zn) and phosphoric acid (H3PO4) to form zinc phosphate (Zn3(PO4)2) and hydrogen gas (H2). The coefficients for this balanced equation are:

3 Zn + 2 H3PO4 = Zn3(PO4)2 + 3 H2 [[4]]

The reaction type for this equation is a single displacement reaction, where an element replaces another element in a compound.

In summary, the balanced equations and reaction types are as follows:

a) 4 Fe + 3 O2 = 2 Fe3O4 (synthesis reaction) b) 3 AgNO3 + AlCl3 = 3 AgCl + Al(NO3)3 (double displacement reaction) c) Al2(CO3)3 = Al2O3 + 3 CO2 (decomposition reaction) d) 3 Zn + 2 H3PO4 = Zn3(PO4)2 + 3 H2 (single displacement reaction)

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