Balance these equations

Question 1

Mg + HCL reacts to form MgCl2 + H2

Answer 1

Mg + 2HCL reacts to form MgCl2 + H2

Question 2

H3PO4 + Ca(OH)2 reacts to form Ca3(PO4)2 + H2O

Answer 2

2H3PO4 + 3Ca(OH)2 reacts to form Ca3(PO4)2 + 6H2O

Question 3

Br2 + KI reacts to form I2 + KBr

Answer 3

Br2 + 2KI reacts to form I2 +2 KBr

Question 4

S + O2 reacts to form SO2

Answer 4

Balanced

Question 5

Al2O3 + H2SO4 reacts to form Al2(SO4)3 +H2O

Answer 5

Al2O3 + 3H2SO4 reacts to form Al2(SO4)3 + 3H2O

Question 6

Calcium metal and water to form aqueous calcium hydroxide and hydrogen gas

Answer 6

Ca(solid) + 2H2O(liquid) reacts to form Ca(OH)2(aqueous) + H2(gas)

Question 7

Copper metal and aqueous sulfuric acid to form aqueous copper(II) sulfate, sulfur dioxide gas and water

Answer 7

Cu(solid) + 2H2SO4(aqueous) reacts to form CuSO4(aqueous) + SO2(gas) + 2H2O(liquid)

Question 8

Nitrogen monoxide gas and hydrogen gas to form nitrogen gas and water vapor

Answer 8

2NO(gas) + 2H2(gas) reacts to form N2(gas) + 2H2O(gas)