Question

1. __ZnS + __HCl → __ZnCl2 + __H2S
2. __HCl + __Cr → __CrCl2 + __H2

3. __Al + __Fe3O4 → __Al2O3 + __Fe

4. __H2 + __Br2 → __HBr

5. __Na2S2O3 + __I2 → __NaI + __Na2S4O6

6. __LaCl3 + __Na2CO3 → __La2(CO3)3 + __NaCl

7. __NH4Cl + __Ba(OH)2 → __BaCl2 + __NH3 + __H2O

8. __Ca(OH)2 + __H3PO4 → __Ca3(PO4)2 + __H2O

9. __C4H10 + __O2 → __CO2 + __H2O

10. __C7H6O2 + __O2 → __CO2 + __H2O

fill in the blank spots with the correct answers

Answer 1

To balance each of the chemical equations, you need to ensure that the number of atoms of each element is the same on both sides of the equation. Below are the balanced equations for each reaction:

1. **ZnS + 2 HCl → ZnCl2 + H2S**

2. **2 HCl + Cr → CrCl2 + H2**

3. **3 Al + Fe3O4 → Al2O3 + 3 Fe**

4. **H2 + Br2 → 2 HBr**

5. **2 Na2S2O3 + I2 → 4 NaI + Na2S4O6**

6. **2 LaCl3 + 3 Na2CO3 → La2(CO3)3 + 6 NaCl**

7. **2 NH4Cl + Ba(OH)2 → BaCl2 + 2 NH3 + 2 H2O**

8. **6 Ca(OH)2 + 2 H3PO4 → Ca3(PO4)2 + 6 H2O**

9. **2 C4H10 + 13 O2 → 8 CO2 + 10 H2O**

10. **C7H6O2 + 7 O2 → 7 CO2 + 3 H2O**

Make sure to double-check each step while balancing to confirm that atom conservation is upheld across the reactions.