Question

2Fe + S2 -> 2FeS b. Sodium hydroxide is dissolved in water and this solution is added to an aqueous solution of magnesium chloride to form solid magnesium hydroxide which precipitates out of solution. The other product is sodium chloride which stays in solution Write the symbols of the reactants. Write the symbols of the products. Write a balanced equation for the reaction. c. When carbon is burned in air, but there is only a limited amount of oxygen available, carbon monoxide is formed. When carbon is burned in air and there is an excess of oxygen, then carbon dioxide is formed. Two separate reactions are described here. Write a balanced equation for each reaction.

Answer 1

b) 1.symbol of reactants = NaOH , MgCl2

2. Symbol of products =Mg(OH)2 , NaCl

Balanced reaction,

NaOH(aq.) + MgCl2(aq.)-----> Mg(OH)2(s) + H2O(l)

C. Balanced reactions

2C + O2 ---> 2CO

C + O2 -----> CO2

6) a. Metallic sodium and chlorine gas is react to form Sodium chloride.

Na And Cl2 are reactants and NaCl is product

b) Calcium carbonate decomposed in Calcium oxide and carbon dioxide gas

CaCO3 is reactant and CaO , CO2 are products

C) Copper nitrate and sodium bicarbonate reacts to form copper carbonate , sodium nitrate , water and carbon dioxide gas.

Cu(NO3)2 and NaHCO3 are reactants while CuCO3 , NaNO3 , H2O , CO2 are products