Hướng dẫn giải Luyện tập 5 (Trang 63 SGK Hóa 10, Bộ Chân trời sáng tạo)
<p>Cho biết loại liên kết trong các phân tử MgCl<sub>2</sub>, CO<sub>2</sub> và C<sub>2</sub>H<sub>4</sub>?</p>
<p><strong>Lời giải:</strong></p>
<p><strong><span id="MathJax-Element-1-Frame" class="mjx-chtml MathJax_CHTML" style="box-sizing: border-box; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-style: normal; font-weight: normal; font-size: 22.5px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; position: relative;" tabindex="0" role="presentation" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>&#x394;</mi><mi>&#x3C7;</mi><mo>=</mo><mi>&#x3C7;</mi><mo>(</mo><mi>C</mi><mi>l</mi><mo>)</mo><mo>&#x2212;</mo><mi>&#x3C7;</mi><mo>(</mo><mi>M</mi><mi>g</mi><mo>)</mo><mo>=</mo><mn>3</mn><mo>,</mo><mn>16</mn><mo>&#x2212;</mo><mn>1</mn><mo>,</mo><mn>31</mn><mo>=</mo><mn>1</mn><mo>,</mo><mn>85</mn><mo>&gt;</mo><mn>1</mn><mo>,</mo><mn>7</mn></math>"><span id="MJXc-Node-1" class="mjx-math" aria-hidden="true"><span id="MJXc-Node-2" class="mjx-mrow"><span id="MJXc-Node-3" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I">Δ</span></span><span id="MJXc-Node-4" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I">χ</span></span><span id="MJXc-Node-5" class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">=</span></span><span id="MJXc-Node-6" class="mjx-mi MJXc-space3"><span class="mjx-char MJXc-TeX-math-I">χ</span></span><span id="MJXc-Node-7" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">(</span></span><span id="MJXc-Node-8" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I">C</span></span><span id="MJXc-Node-9" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I">l</span></span><span id="MJXc-Node-10" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">)</span></span><span id="MJXc-Node-11" class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">−</span></span><span id="MJXc-Node-12" class="mjx-mi MJXc-space2"><span class="mjx-char MJXc-TeX-math-I">χ</span></span><span id="MJXc-Node-13" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">(</span></span><span id="MJXc-Node-14" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I">M</span></span><span id="MJXc-Node-15" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I">g</span></span><span id="MJXc-Node-16" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">)</span></span><span id="MJXc-Node-17" class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">=</span></span><span id="MJXc-Node-18" class="mjx-mn MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">3</span></span><span id="MJXc-Node-19" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-20" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">16</span></span><span id="MJXc-Node-21" class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">−</span></span><span id="MJXc-Node-22" class="mjx-mn MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">1</span></span><span id="MJXc-Node-23" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-24" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">31</span></span><span id="MJXc-Node-25" class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">=</span></span><span id="MJXc-Node-26" class="mjx-mn MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">1</span></span><span id="MJXc-Node-27" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-28" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">85</span></span><span id="MJXc-Node-29" class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">></span></span><span id="MJXc-Node-30" class="mjx-mn MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">1</span></span><span id="MJXc-Node-31" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-32" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">7</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>Δ</mi><mi>χ</mi><mo>=</mo><mi>χ</mi><mo>(</mo><mi>C</mi><mi>l</mi><mo>)</mo><mo>−</mo><mi>χ</mi><mo>(</mo><mi>M</mi><mi>g</mi><mo>)</mo><mo>=</mo><mn>3</mn><mo>,</mo><mn>16</mn><mo>−</mo><mn>1</mn><mo>,</mo><mn>31</mn><mo>=</mo><mn>1</mn><mo>,</mo><mn>85</mn><mo>></mo><mn>1</mn><mo>,</mo><mn>7</mn></math></span></span></strong></p>
<p>⇒ Liên kết Mg-Cl trong phân tử MgCl<sub>2 </sub>là liên kết ion.</p>
<p><span id="MathJax-Element-2-Frame" class="mjx-chtml MathJax_CHTML" style="box-sizing: border-box; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-style: normal; font-weight: normal; font-size: 22.5px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; position: relative;" tabindex="0" role="presentation" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>&#x394;</mi><mi>&#x3C7;</mi><mo>=</mo><mi>&#x3C7;</mi><mo>(</mo><mi>O</mi><mo>)</mo><mo>&#x2212;</mo><mi>&#x3C7;</mi><mo>(</mo><mi>C</mi><mo>)</mo><mo>=</mo><mn>3</mn><mo>,</mo><mn>44</mn><mo>&#x2212;</mo><mn>2</mn><mo>,</mo><mn>55</mn><mo>=</mo><mn>0</mn><mo>,</mo><mn>89</mn></math>"><span id="MJXc-Node-33" class="mjx-math" aria-hidden="true"><span id="MJXc-Node-34" class="mjx-mrow"><span id="MJXc-Node-35" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I">Δ</span></span><span id="MJXc-Node-36" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I">χ</span></span><span id="MJXc-Node-37" class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">=</span></span><span id="MJXc-Node-38" class="mjx-mi MJXc-space3"><span class="mjx-char MJXc-TeX-math-I">χ</span></span><span id="MJXc-Node-39" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">(</span></span><span id="MJXc-Node-40" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I">O</span></span><span id="MJXc-Node-41" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">)</span></span><span id="MJXc-Node-42" class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">−</span></span><span id="MJXc-Node-43" class="mjx-mi MJXc-space2"><span class="mjx-char MJXc-TeX-math-I">χ</span></span><span id="MJXc-Node-44" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">(</span></span><span id="MJXc-Node-45" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I">C</span></span><span id="MJXc-Node-46" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">)</span></span><span id="MJXc-Node-47" class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">=</span></span><span id="MJXc-Node-48" class="mjx-mn MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">3</span></span><span id="MJXc-Node-49" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-50" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">44</span></span><span id="MJXc-Node-51" class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">−</span></span><span id="MJXc-Node-52" class="mjx-mn MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">2</span></span><span id="MJXc-Node-53" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-54" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">55</span></span><span id="MJXc-Node-55" class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">=</span></span><span id="MJXc-Node-56" class="mjx-mn MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">0</span></span><span id="MJXc-Node-57" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-58" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">89</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>Δ</mi><mi>χ</mi><mo>=</mo><mi>χ</mi><mo>(</mo><mi>O</mi><mo>)</mo><mo>−</mo><mi>χ</mi><mo>(</mo><mi>C</mi><mo>)</mo><mo>=</mo><mn>3</mn><mo>,</mo><mn>44</mn><mo>−</mo><mn>2</mn><mo>,</mo><mn>55</mn><mo>=</mo><mn>0</mn><mo>,</mo><mn>89</mn></math></span></span></p>
<p>⇒ Liên kết C=O trong phân tử CO<sub>2 </sub>là liên kết cộng hóa trị phân cực.</p>
<p><span id="MathJax-Element-3-Frame" class="mjx-chtml MathJax_CHTML" style="box-sizing: border-box; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-style: normal; font-weight: normal; font-size: 22.5px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; position: relative;" tabindex="0" role="presentation" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>&#x394;</mi><mi>&#x3C7;</mi><mo>=</mo><mi>&#x3C7;</mi><mo>(</mo><mi>C</mi><mo>)</mo><mo>&#x2212;</mo><mi>&#x3C7;</mi><mo>(</mo><mi>H</mi><mo>)</mo><mo>=</mo><mn>2</mn><mo>,</mo><mn>55</mn><mo>&#x2212;</mo><mn>2</mn><mo>,</mo><mn>2</mn><mo>=</mo><mn>0</mn><mo>,</mo><mn>35</mn></math>"><span id="MJXc-Node-59" class="mjx-math" aria-hidden="true"><span id="MJXc-Node-60" class="mjx-mrow"><span id="MJXc-Node-61" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I">Δ</span></span><span id="MJXc-Node-62" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I">χ</span></span><span id="MJXc-Node-63" class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">=</span></span><span id="MJXc-Node-64" class="mjx-mi MJXc-space3"><span class="mjx-char MJXc-TeX-math-I">χ</span></span><span id="MJXc-Node-65" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">(</span></span><span id="MJXc-Node-66" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I">C</span></span><span id="MJXc-Node-67" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">)</span></span><span id="MJXc-Node-68" class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">−</span></span><span id="MJXc-Node-69" class="mjx-mi MJXc-space2"><span class="mjx-char MJXc-TeX-math-I">χ</span></span><span id="MJXc-Node-70" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">(</span></span><span id="MJXc-Node-71" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I">H</span></span><span id="MJXc-Node-72" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">)</span></span><span id="MJXc-Node-73" class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">=</span></span><span id="MJXc-Node-74" class="mjx-mn MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">2</span></span><span id="MJXc-Node-75" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-76" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">55</span></span><span id="MJXc-Node-77" class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">−</span></span><span id="MJXc-Node-78" class="mjx-mn MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">2</span></span><span id="MJXc-Node-79" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-80" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">2</span></span><span id="MJXc-Node-81" class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">=</span></span><span id="MJXc-Node-82" class="mjx-mn MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">0</span></span><span id="MJXc-Node-83" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-84" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">35</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>Δ</mi><mi>χ</mi><mo>=</mo><mi>χ</mi><mo>(</mo><mi>C</mi><mo>)</mo><mo>−</mo><mi>χ</mi><mo>(</mo><mi>H</mi><mo>)</mo><mo>=</mo><mn>2</mn><mo>,</mo><mn>55</mn><mo>−</mo><mn>2</mn><mo>,</mo><mn>2</mn><mo>=</mo><mn>0</mn><mo>,</mo><mn>35</mn></math></span></span></p>
<p>⇒ Liên kết C-H trong phân tử C<sub>2</sub>H<sub>4</sub> là liên kết cộng hóa trị không phân cực.</p>