物质 | MgO | Mg(OH)2 | MgCO3 | “镁粉” |
消耗稀盐酸的质量/克 | 121.8 | m | 58.0 | 61.9 |
(1)烧杯③中产生的气体是
(2)“镁粉”中不只含有MgCO3一种物质,理由是
(3)表格中m的值为多少?(请写出计算过程)
(4)为确定“镁粉”的具体成分,兴趣小组补充了如下实验:取“镁粉”和MgCO3各4.2克,加入足量稀盐酸,生成相同条件下的气体体积分别为952毫升和1120毫升。由此可知该种“镁粉”的成分是
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2