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		<h1>HỖN HỢP. TÁCH CHẤT RA KHỎI HỖN HỢP</h1>
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			Câu 1:<br />Nước biển có chứa những chất gì mà lại có vị mặn?
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			<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span lang="EN-US" style="color:black">GIẢI</span></u></b></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">Nước biển chứa&nbsp;các&nbsp;chất&nbsp;muối hòa tan làm cho nó&nbsp;có vị mặn. Đó là những loại chất&nbsp;hòa tan như kali nitrat, natri clorua và bicarbonate. Muối được lắng đọng trong đại dương thông qua nhiều cách khác nhau từ hàng tỷ năm trước. Muối được tích lũy đều đặn cho đến khi&nbsp;nước biển&nbsp;gần như bão hòa với hàm lượng muối.</span></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:107%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><span lang="EN-US" style="color:black">Câu 2:</span></b></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:107%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">1. Khi pha thêm nước vào cốc nước cam, em thấy màu và vị nước cam thay đổi thế nào? Từ đó hãy cho biết: Tính chất hỗn hợp có phụ thuộc vào thành phần không?</span></span></span></span></span><br  />
<span lang="EN-US" style="font-size:12.0pt"><span style="line-height:107%"><span style="font-family:&#039;Times New Roman&#039;,serif">2. Hãy kể một số chất tinh khiết và hỗn hợp xung quanh em.</span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span lang="EN-US" style="color:black">GIẢI</span></u></b></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">1. Khi pha thêm nước vào cốc nước cam, em thấy màu nước cam nhạt dần, và vị cũng nhạt</span></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">Từ đó ta thấy được tính chất hỗn hợp phụ thuộc vào thành phần.</span></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">2. Chất tinh khiết: vàng,kim cương, nước cất</span></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">&nbsp; &nbsp; Hỗn hợp: gang, thép, nước đường.</span></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:107%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><span lang="EN-US" style="color:black">Câu 3:</span></b></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:107%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">1. Khi hòa muối ăn vào nước, nếu muối không tan hết, bị ắng xuống đáy thì có tạo thành huyền phù không?</span></span></span></span></span><br  />
<span lang="EN-US" style="font-size:12.0pt"><span style="line-height:107%"><span style="font-family:&#039;Times New Roman&#039;,serif">2. Kể tên một số nhũ tương và huyền phù xung quanh em.</span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span lang="EN-US" style="color:black">GIẢI</span></u></b></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">1. Khi hòa muối ăn vào nước, nếu muối không tan hết, bị ắng xuống đáy thì không tạo thành huyền phù. Vì huyền phù gồm các hạt chất rắn lơ lửng trong lòng chất lỏng.</span></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">2.&nbsp;</span></span></span></span></span>
<ul>
	<li style="margin-top:1px; margin-bottom:1px; text-align:justify"><span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">Huyền phù: bùn trong nước, phù sa trong nước</span></span></span></span></span></li>
	<li style="margin-top:1px; margin-bottom:1px; text-align:justify"><span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">Nhũ tương: hỗn hợp lòng đỏ trứng và lòng trắng trứng, bơ, viên nang cá,...</span></span></span></span></span></li>
</ul>

<div style="margin-top:1px; margin-bottom:1px; text-align:justify"><span style="font-size:12pt"><span style="background:white"><span style="line-height:107%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><span lang="EN-US" style="color:black">Câu 4:</span></b></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:107%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">1. Nêu một vài ví dụ trong thực tế cho thấy chất rắn, chất lỏng, chất khí tan trong nước.</span></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:107%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">2. Để hòa tan được nhiều muối ăn hơn, ta phải pha muối vào nước nóng hay nước lạnh? Vì sao?</span></span></span></span></span><br  />
<span lang="EN-US" style="font-size:12.0pt"><span style="line-height:107%"><span style="font-family:&#039;Times New Roman&#039;,serif">3. Những ngày trời nóng, cá ở một số ao, hồ hay ngoi lên mặt nước. Vì sao?</span></span></span></div>
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span lang="EN-US" style="color:black">GIẢI</span></u></b></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">1.</span></span></span></span></span>

<ul>
	<li style="margin-top:1px; margin-bottom:1px; text-align:justify"><span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">Một số chất rắn tan được trong nước: đường, muối, viên C sủi,...</span></span></span></span></span></li>
	<li style="margin-top:1px; margin-bottom:1px; text-align:justify"><span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">Một số chất lỏng tan được trong nước: rượu, giấm ăn, ...</span></span></span></span></span></li>
	<li style="margin-top:1px; margin-bottom:1px; text-align:justify"><span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">Một số chất khí tan được trong nước: oxygen, cacbon dioxide, ...</span></span></span></span></span></li>
</ul>
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">2. Để hòa tan được nhiều muối ăn hơn, ta phải pha muối vào nước nóng. Vì các chắn rắn sẽ tan tốt hơn trong nước nóng.</span></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">3. Những ngày trời nóng, cá ở một số ao, hồ hay ngoi lên mặt nước. Vì khác với chất rắn, các chất khí tan ít hơn trong nước nóng, do đó lượng dưỡng khí trong nước ít đi nên cá phải ngoi lên mặt nước để thở.</span></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:107%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><span lang="EN-US" style="color:black">Câu 5:</span></b></span></span></span></span><br  />
<span lang="EN-US" style="font-size:12.0pt"><span style="line-height:107%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="color:black">Từ xưa có câu:&quot; đãi cát tìm vàng&quot;. Vậy người ta đã tách vàng ra khỏi cát như thế nào?</span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span lang="EN-US" style="color:black">GIẢI</span></u></b></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">Người ta dùng phương pháp thủy lực sử dụng một dòng nước chảy xiết với sức nước đủ lớn để&nbsp;tách&nbsp;các hạt&nbsp;vàng ra khỏi&nbsp;đất&nbsp;cát&nbsp;sau đó để chúng chảy vào các máng để trôi đi đất&nbsp;cát&nbsp;và thu lại&nbsp;vàng.</span></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:107%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><span lang="EN-US" style="color:black">Câu 6:</span></b></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:107%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">1. Trên thực tế em thường gặp chất tinh khiết hay hỗn hợp? Vì sao chúng ta cần phải tách chất?</span></span></span></span></span><br  />
<span lang="EN-US" style="font-size:12.0pt"><span style="line-height:107%"><span style="font-family:&#039;Times New Roman&#039;,serif">2. Lấy một số vị dụ về quá trính tách chất trong tự nhiên và trong đời sống mà em biết.</span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><u><span lang="EN-US" style="color:black">GIẢI</span></u></b></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">1. Trên thực tế em thường gặp hỗn hợp.</span></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">&nbsp; &nbsp; Ta cần phải tách chất để thu được chất tinh khiết, phục vụ cho nhu cầu sinh hoạt và sản xuất.</span></span></span></span></span><br  />
<span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">2. Một số ví dụ về quá trình tách chất trong tự nhiên và trong đời sống:</span></span></span></span></span>

<ul>
	<li style="margin-top:1px; margin-bottom:1px; text-align:justify"><span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">Phù sa trong nước sông lắng xuống, tách khỏi nước</span></span></span></span></span></li>
	<li style="margin-top:1px; margin-bottom:1px; text-align:justify"><span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">Làm bay hơi muối biển, thu được muối ăn.</span></span></span></span></span></li>
	<li style="margin-top:1px; margin-bottom:1px; text-align:justify"><span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">Đãi vàng từ đất cát trong quặng vàng.</span></span></span></span></span></li>
</ul>

<div style="margin-top:1px; margin-bottom:1px; text-align:justify"><span style="font-size:12pt"><span style="background:white"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span lang="EN-US" style="color:black">​​​​​​​</span></span></span></span></span></div>
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