Question

6. For each skeleton equation below, classify the type of reaction as a synthesis decomposition, single replacement, double replacement, neutralization, or combustion reaction. Justify your classification. Then write the balanced chemical equation for each.

a) C4H10(g) + O2(g) → CO2(g) + H₂O(g)

b) Li(s) + N₂(g) → Li3N(s)

c) AgNO3(aq) + Na₂CrO4(aq)
NaNO3(aq) + Ag₂CrO4(s)

d) MgO(s)→ Mg(s) + O₂(g)

e) HI(aq) + KOH(aq) →KI(aq) +H₂O(l)

f) AlPO4(aq) + Mg(s) → Al(s) + Mg3(PO4)2(aq)

Answer 1

a) combustion reaction

balanced equation: 2C4H10 + 13O2 → 8CO2 + 10H2O

b) synthesis reaction

balance equation: 6Li + N2 → 2Li3N

c) double replacement

balanced equation: 2AgNO3 + Na2CrO4 → 2NaNO3 + Ag2CrO4

d) decomposition

balanced equation: 2MgO → 2Mg + O2

e) double dispalcement

balanced equation: HI + KOH → KI + H2O

f) single displacement

2AlPO4 + 3Mg → 2Al + Mg3(PO4)2

Explanation (detailed):

a)

Word Equation: Butane + Dioxygen = Carbon Dioxide + Water

How to balance:

1- Label Each Compound With a Variable

Label each compound (reactant or product) in the equation with a variable representing the unknown coefficients.

aC4H10 + bO2 = cCO2 + dH2O

2- Create a System of Equations

Create an equation for each element (C, H, O) where each term represents the number of atoms of the element in each reactant or product.

C: 4a + 0b = 1c + 0d

H: 10a + 0b = 0c + 2d

O: 0a + 2b = 2c + 1d

3-Solve For All Variables

Use substitution, gauss elimination, or a calculator to solve for each variable.

(keep doing this for every equation)

if you have any questions feel free to ask ill be happy to answer