Question

conclusions
word equations: write a chemical equation for each of the reactions. use correct formulas and be sure to balance all equations.
part a:

1. solid magnesium reacts with oxygen gas to produce solid magnesium oxide.
2. solid magnesium also reacts with nitrogen gas to produce solid magnesium nitride.
3. solid magnesium nitride reacts with water to produce ammonia gas (nh₃) and magnesium oxide.

part b:

1. solid copper (ii) carbonate reacts with heat to produce solid copper (ii) oxide and carbon dioxide gas.
2. limewater (also known as calcium hydroxide) reacts with the carbon dioxide gas to produce solid calcium carbonate and water.

part c:

1. solid zinc reacts with aqueous copper (ii) sulfate to produce solid copper and aqueous zinc sulfate.

part d:

1. aqueous iron (iii) nitrate reacts with aqueous potassium thiocyanate to produce a solution of potassium nitrate and iron (iii) thiocyanate (aq).

Explanation:

Step1: Write unbalanced equation

For each reaction, write the formula of reactants on the left side and products on the right side of the arrow.

1. \(Mg(s)+O_{2}(g)

ightarrow MgO(s)\)

1. \(Mg(s)+N_{2}(g)

ightarrow Mg_{3}N_{2}(s)\)

1. \(Mg_{3}N_{2}(s)+H_{2}O(l)

ightarrow NH_{3}(g)+MgO(s)\)

1. \(CuCO_{3}(s)\xrightarrow{\Delta}CuO(s)+CO_{2}(g)\)
2. \(Ca(OH)_{2}(aq)+CO_{2}(g)

ightarrow CaCO_{3}(s)+H_{2}O(l)\)

1. \(Zn(s)+CuSO_{4}(aq)

ightarrow Cu(s)+ZnSO_{4}(aq)\)

1. \(Fe(NO_{3})_{3}(aq)+KSCN(aq)

ightarrow KNO_{3}(aq)+Fe(SCN)_{3}(aq)\)

Step2: Balance the equation

Use the law of conservation of mass (atoms of each element on both sides of the equation must be equal).

1. \(2Mg(s)+O_{2}(g)=2MgO(s)\)
2. \(3Mg(s)+N_{2}(g)=Mg_{3}N_{2}(s)\)
3. \(Mg_{3}N_{2}(s)+3H_{2}O(l)=2NH_{3}(g)+3MgO(s)\)
4. \(CuCO_{3}(s)\xrightarrow{\Delta}CuO(s)+CO_{2}(g)\) (already balanced)
5. \(Ca(OH)_{2}(aq)+CO_{2}(g)=CaCO_{3}(s)+H_{2}O(l)\) (already balanced)
6. \(Zn(s)+CuSO_{4}(aq)=Cu(s)+ZnSO_{4}(aq)\) (already balanced)
7. \(Fe(NO_{3})_{3}(aq)+3KSCN(aq)=3KNO_{3}(aq)+Fe(SCN)_{3}(aq)\)

Answer:

1. \(2Mg(s)+O_{2}(g)=2MgO(s)\)
2. \(3Mg(s)+N_{2}(g)=Mg_{3}N_{2}(s)\)
3. \(Mg_{3}N_{2}(s)+3H_{2}O(l)=2NH_{3}(g)+3MgO(s)\)
4. \(CuCO_{3}(s)\xrightarrow{\Delta}CuO(s)+CO_{2}(g)\)
5. \(Ca(OH)_{2}(aq)+CO_{2}(g)=CaCO_{3}(s)+H_{2}O(l)\)
6. \(Zn(s)+CuSO_{4}(aq)=Cu(s)+ZnSO_{4}(aq)\)
7. \(Fe(NO_{3})_{3}(aq)+3KSCN(aq)=3KNO_{3}(aq)+Fe(SCN)_{3}(aq)\)