Bài 10: Oxide
Câu hỏi trang 45 KHTN-8
<p><strong>Câu hỏi trang 45 KHTN lớp 8:</strong> Cho các sơ đồ phản ứng sau:</p>
<p>(1) .. ? .. + O<sub>2</sub> <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: 21.78px; 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"><mo>&#x2212;</mo><mo>&#x2212;</mo><mo>&#x2212;</mo><mtext>&#x2009;</mtext><mo>&#x2212;</mo><mo>&#x2192;</mo></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-mo"><span class="mjx-char MJXc-TeX-main-R">−</span></span><span id="MJXc-Node-4" class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">−</span></span><span id="MJXc-Node-5" class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">−</span></span><span id="MJXc-Node-6" class="mjx-mtext"></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-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">→</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation"><math xmlns="http://www.w3.org/1998/Math/MathML"><mo>−</mo><mo>−</mo><mo>−</mo><mtext> </mtext><mo>−</mo><mo>→</mo></math></span></span> Al<sub>2</sub>O<sub>3</sub></p>
<p>(2) 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: 21.78px; 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"><mo>&#x2212;</mo><mo>&#x2212;</mo><mo>&#x2212;</mo><mtext>&#x2009;</mtext><mo>&#x2212;</mo><mo>&#x2192;</mo></math>"><span id="MJXc-Node-9" class="mjx-math" aria-hidden="true"><span id="MJXc-Node-10" class="mjx-mrow"><span id="MJXc-Node-11" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">−</span></span><span id="MJXc-Node-12" class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">−</span></span><span id="MJXc-Node-13" class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">−</span></span><span id="MJXc-Node-14" class="mjx-mtext"></span><span id="MJXc-Node-15" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">−</span></span><span id="MJXc-Node-16" class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">→</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation"><math xmlns="http://www.w3.org/1998/Math/MathML"><mo>−</mo><mo>−</mo><mo>−</mo><mtext> </mtext><mo>−</mo><mo>→</mo></math></span></span> P<sub>2</sub>O<sub>5</sub></p>
<p>(3) S + .. ? .. <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: 21.78px; 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"><mo>&#x2212;</mo><mo>&#x2212;</mo><mo>&#x2212;</mo><mtext>&#x2009;</mtext><mo>&#x2212;</mo><mo>&#x2192;</mo></math>"><span id="MJXc-Node-17" class="mjx-math" aria-hidden="true"><span id="MJXc-Node-18" class="mjx-mrow"><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-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">−</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-mtext"></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-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">→</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation"><math xmlns="http://www.w3.org/1998/Math/MathML"><mo>−</mo><mo>−</mo><mo>−</mo><mtext> </mtext><mo>−</mo><mo>→</mo></math></span></span> SO<sub>2</sub></p>
<p>(4) Mg + O<sub>2<span id="MathJax-Element-4-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: 16.2px; 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"><mo>&#x2212;</mo><mo>&#x2212;</mo><mo>&#x2212;</mo><mtext>&#x2009;</mtext><mo>&#x2212;</mo><mo>&#x2192;</mo></math>"><span id="MJXc-Node-25" class="mjx-math" aria-hidden="true"><span id="MJXc-Node-26" class="mjx-mrow"><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-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">−</span></span><span id="MJXc-Node-29" class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">−</span></span><span id="MJXc-Node-30" class="mjx-mtext"></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-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">→</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation"><math xmlns="http://www.w3.org/1998/Math/MathML"><mo>−</mo><mo>−</mo><mo>−</mo><mtext> </mtext><mo>−</mo><mo>→</mo></math></span></span></sub> .. ? ..</p>
<p>Hoàn thành các phương trình hoá học và đọc tên các sản phẩm tạo thành.</p>
<p><strong>Trả lời:</strong></p>
<p>(1) 4Al + 3O<sub>2</sub> → 2Al<sub>2</sub>O<sub>3</sub> (aluminium oxide)</p>
<p>(2) 4P + 5O<sub>2</sub> → 2P<sub>2</sub>O<sub>5</sub> (diphosphorus pentoxide)</p>
<p>(3) S + O<sub>2</sub> → SO<sub>2</sub> (sulfur dioxide)</p>
<p>(4) 2Mg + O<sub>2</sub> → 2MgO (magnesium oxide)</p>
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