下列变化中属于物理变化的是：

试卷相关题目

• 1“锌强化营养盐”中的“锌”指的是：

  A.单质

  B.分子

  C.原子

  D.元素

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• 2下列“家庭小实验”不能达到预期目的的是：

  A.品尝——鉴别白糖和食盐(厨房中)

  B.观察——鉴别硬水和软水

  C.闻气味——鉴别尿素和碳铵

  D.燃烧——鉴别羊毛和涤纶

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• 3右图为元素周期表第三周期的局部。据此判断下列说法中正确的是： <table style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; WIDTH: 190.4pt; BORDER-COLLAPSE: collapse; MARGIN-LEFT: 6.75pt; BORDER-TOP: medium none; MARGIN-RIGHT: 6.75pt; BORDER-RIGHT: medium none; mso-border-alt: solid windowtext .5pt; mso-table-lspace: 9.0pt; mso-table-rspace: 9.0pt; mso-table-anchor-vertical: paragraph; mso-table-anchor-horizontal: page; mso-table-left: 312.1pt; mso-table-top: 4.15pt; mso-padding-alt: 0cm 1.4pt 0cm 1.4pt; mso-border-insideh: .5pt solid windowtext; mso-border-insidev: .5pt solid windowtext" border="1" cellspacing="0" cellpadding="0" width="254" align="left" _dj="MsoNormalTable"><tbody><tr style="PAGE-BREAK-INSIDE: avoid; HEIGHT: 3.7pt; mso-yfti-irow: 0; mso-yfti-firstrow: yes; mso-yfti-lastrow: yes"><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: windowtext 1pt solid; PADDING-BOTTOM: 0cm; PADDING-LEFT: 1.4pt; WIDTH: 46.4pt; PADDING-RIGHT: 1.4pt; HEIGHT: 3.7pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt" width="62">11 Na23.00</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 1.4pt; WIDTH: 54pt; PADDING-RIGHT: 1.4pt; HEIGHT: 3.7pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" width="72">12 Mg24.31</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 1.4pt; WIDTH: 45pt; PADDING-RIGHT: 1.4pt; HEIGHT: 3.7pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" width="60">13 Al26.98</td><td style="BORDER-BOTTOM: windowtext 1pt solid; BORDER-LEFT: medium none; PADDING-BOTTOM: 0cm; PADDING-LEFT: 1.4pt; WIDTH: 45pt; PADDING-RIGHT: 1.4pt; HEIGHT: 3.7pt; BORDER-TOP: windowtext 1pt solid; BORDER-RIGHT: windowtext 1pt solid; PADDING-TOP: 0cm; mso-border-alt: solid windowtext .5pt; mso-border-left-alt: solid windowtext .5pt" width="60">14  Si28.09</td></tr></tbody></table> 

  A.它们都属于金属元素

  B.1个铝原子的质量是26.98g

  C.硅元素的原子序数为l4

  D.镁元素的相对原子质量为l2

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• 4感受化学与人体健康的密切关系。下列说法不正确的是：

  A.食用鸡蛋可补充蛋白质

  B.食用黄瓜可补充维生素C

  C.缺铁会引起贫血

  D.缺碘易导致骨质疏松

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