Ajụjụ Ihe Nlereanya na Mkparịta Ụka Banyere Alkanes
Alkanes bụ ngwakọta hydrocarbon dị mfe nke nwere njikọ otu n'etiti atọm carbon na hydrogen. A makwaara ha dị ka paraffin ma nwee agbụ carbon juru eju. Isi ihe dị na alkanes bụ enweghị ike ha, ọ bụ ya mere a na-ejikarị ha eme ihe dị ka mmanụ ọkụ na mmanụ. N'isiokwu a, anyị ga-atụle ọtụtụ nsogbu na ngwọta ha metụtara alkanes.
Okwu Mmalite nke Alkanes
Enwere ike igosi alkanes site na usoro izugbe \(C_nH_{2n+2}\), ebe \(n\) bụ ọnụọgụ atọm carbon. Alkane kachasị mfe bụ methane (\(CH_4\)) nwere otu atọm carbon. Ethane (\(C_2H_6\)), propane (\(C_3H_8\)), na ndị ọzọ sochiri ya. Aha alkanes na-esochi aha IUPAC (International Union of Pure and Applied Chemistry) nke na-eji njedebe '-ane'.
Njirimara anụ ahụ nke Alkanes
– Ọnọdụ anụ ahụ: Ka atọm carbon dị n'agbụ ahụ na-abawanye, otú ahụ ka ebe agbaze na isi mmiri na-esi elu. Dịka ọmụmaatụ, methane, ethane, na propane bụ gas n'ọnọdụ okpomọkụ ụlọ, ebe alkanes buru ibu (dịka ọmụmaatụ, octane) bụ mmiri mmiri.
– Mmiri Na-agbaze: Alkanes anaghị agbaze na mmiri mana ha na-agbaze na ihe mgbaze ndị ọzọ na-abụghị polar n'ihi na ha na-eme ka mmiri ghara ịgbaze.
– Mmeghachi omume: Alkanes anaghị arụ ọrụ nke ọma karịa hydrocarbons ndị ọzọ n'ihi njikọ siri ike ha nwere otu.
Mmeghachi omume dị mkpa nke Alkanes
– Ọkụ: Alkanes nwere ike ịgba ọkụ zuru oke site na iji carbon dioxide na mmiri, ma ọ bụ ọkụ zuru oke nke na-emepụta carbon monoxide na mmiri.
– Halogenation: Alkanes nwere ike imeghachi omume na halogens (dịka ọmụmaatụ, chlorine ma ọ bụ bromine) n'ọnọdụ ụfọdụ iji mepụta alkyl halides.
Ka anyị leba anya n'ụfọdụ ajụjụ atụ na mkparịta ụka ha iji ghọta echiche ndị dị n'elu nke ọma.
Ajụjụ Ihe Nlereanya nke 1: Ịkpọ aha Alkanes
Soal
Nye aha IUPAC maka ihe mejupụtara a:
1. \( CH_3-CH_2-CH_3 \)
2. ( CH_3-CH_2-CH_2-CH_2-CH_3 \)
3. \( CH_3-CH_2-CH_2-CH_2-CH_3-CH_2-CH_3 \)
Mkparịta ụka
1. Ihe mejupụtara ya na usoro \( CH_3-CH_2-CH_3 \) bụ propane. Aha IUPAC maka ihe mejupụtara a bụ Propane.
2. Ihe mejupụtara ya na usoro \( CH_3-CH_2-CH_2-CH_2-CH_3 \) bụ pentane. Aha IUPAC maka ihe mejupụtara a bụ Pentane.
3. Ihe mejupụtara ya na usoro \( CH_3-CH_2-CH_2-CH_2-CH_3-CH_2-CH_3 \) bụ heptane. Aha IUPAC maka ihe mejupụtara a bụ Heptane.
Penjelasan
Mgbe ị na-akpọ alkanes aha, enwere ike ịgbaso iwu abụọ bụ isi:
1. Chọpụta agbụ ígwè carbon kachasị ogologo dị ka agbụ ígwè bụ isi.
2. Kpọọ ya aha dịka ọnụọgụ atọm carbon dị na yinye ahụ si dị (met-, et-, prop-, but-, wdg), wee soro ya -ane.
Ajụjụ Ihe Nlereanya nke 2: Ndị Isomers
Soal
Dee ma kpọọ aha nhazi isomeric maka butane (\(C_4H_{10}\)).
Mkparịta ụka
Butane nwere ihe ndị na-emepụta ihe abụọ:
1. n-Butane:
Nhazi: \( CH_3-CH_2-CH_2-CH_3 \)
Aha IUPAC: n-Butane
2. Isobutane (Methylpropane):
Nhazi:
““
CH3
|
CH3-C-CH3
|
H
““
Aha IUPAC: 2-Methylpropane
Penjelasan
Isomers bụ ihe mejupụtara nwere otu usoro molekul mana ha dị iche iche. Maka butane (\(C_4H_{10}\)), anyị nwere usoro abụọ nwere ike ịdị:
– n-Butane nwere agbụ carbon kwụ ọtọ.
– Isobutane nwere alaka (methyl) na carbon nke abụọ.
Ajụjụ Ihe Nlereanya nke 3: Ọkụ nke Alkanes
Soal
Dee mmeghachi omume ọkụ zuru oke na nke na-ezughị ezu maka propane (\(C_3H_8\)).
Mkparịta ụka
1. Ọkụ zuru oke:
Mmeghachi omume: \( C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O \)
2. Ọkụ na-ezughị ezu:
- Na-emepụta carbon monoxide;
Mmeghachi omume: \( C_3H_8 + 3.5O_2 \rightarrow 3CO + 4H_2O \)
- Na-emepụta carbon siri ike (soot):
Mmeghachi omume: \( C_3H_8 + 2O_2 \rightarrow 3C + 4H_2O \)
Penjelasan
N'ọkụ zuru oke, alkanes na-emeghachi omume na oxygen zuru oke iji mepụta carbon dioxide na mmiri. Ọkụ na-ezughị ezu, n'ihi enweghị oxygen, na-emepụta carbon monoxide ma ọ bụ carbon siri ike.
Ajụjụ Ihe Nlereanya nke 4: Mmeghachi omume nnọchi anya na Alkanes
Soal
Dee usoro mmeghachi omume maka halogenation nke methane na chlorine ma kpọọ aha ngwaahịa ahụ si na ya pụta.
Mkparịta ụka
Mmeghachi omume nnọchi maka methane na chlorine:
\[CH_4 + Cl_2 \rightarrow CH_3Cl + HCl \] (n'ihu ìhè UV)
Ngwaahịa ndị a na-esi na ya apụta bụ methyl chloride (\(CH_3Cl\)) na hydrochloric acid (\(HCl\)).
Penjelasan
Halogenation bụ mmeghachi omume nke otu ma ọ bụ karịa atọm hydrogen dị na alkane na-anọchi atọm halogen. N'ọnọdụ a, methane na-emeghachi omume na chlorine, ebe otu atọm hydrogen na-anọchi atọm chlorine, a chọkwara ìhè UV dị ka ihe na-akpali akpali.
Ajụjụ Ihe Nlereanya nke 5: Usoro Empirical na Molekụla
Soal
Ọ bụrụ na e jiri alkane mee ihe nwere oke ihe mejupụtara 82,76% carbon na 17,24% hydrogen, chọpụta usoro ihe atụ na molekul maka alkane ma ọ bụrụ na oke molar ya bụ 58 g/mol.
Mkparịta ụka
1. Gbakọọ mole nke ihe ọ bụla dabere na oke atọm.
– C: \( \left(\frac{82,76}{12}\right) = 6,896 \)
– H: \( \left(\frac{17,24}{1}\right) = 17,24 \)
2. Mee ka ntụnyere ahụ dị mfe iji mee ka ọ dị mfe:
– Oke zuru oke: \( \left(\frac{6,896}{6,896}\right) = 1 \)
– H/C ruru: \( \left(\frac{17,24}{6,896}\right) = 2,5 \)
3. Gbanwee oke: \[ C_{2}\left(\frac{2,5 \cdot (2)}{2}\right)H_{5} = C_{4}H_{10}\]
4. Usoro ihe atụ nke ihe e ji eme ihe kwekọrọ na alkane (58 g/mol).
Penjelasan
Site n'ịgbaso usoro ndị a, anyị na-enweta usoro ihe atụ na nke molekul nke alkanes nke a na-ahazi dabere na oke atọm dị n'etiti ha na nguzozi oke ha niile.
Mmechi
Ịghọta alkanes dị oke mkpa na kemistri organic bụ isi. Site na ihe atụ na mkparịta ụka dị iche iche, anyị akọwaala otu esi akpọ alkanes aha, ghọta isomerism, mmeghachi omume ọkụ, nnọchi, na ịchọpụta usoro ihe atụ na molekul nke alkanes. Ịghọta echiche ndị a ga-enyere gị aka ịkwadebe maka ojiji na ihe ịma aka dị iche iche metụtara hydrocarbons jupụtara na ndụ na ụlọ ọrụ kwa ụbọchị.
