Balance the equations below by writing the appropriate coefficients in the blanks. 1. ___ NaNO3 + ___ PbO ___ Pb(NO3)2 + ___ Na2O

2. ___ Ca3P2 + ___ H2O ___Ca(OH)2 + ___ PH3

3. ___Fe2O3 + ___ CO ___Fe + ___ CO2

4. ___NH3 + ___ O2 ___ NO2 + ___ H2O

5. ___FeS + ___O2 ___Fe2O3 + ___SO2

6. ___ C3H6O2 + ___ O2 ___ CO2 + ___ H2O

6 hopefully this will help

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

the temperature of the gas, in k, not celsius.