物质 | 甲 | 乙 | 丙 | 丁 |
反应前质量(g) | 4.0 | 2.0 | 3.0 | 2.0 |
反应后质量(g) | 1.2 | X | 2.4 | 5.4 |
A.乙是催化剂 |
B.甲、丙是反应物 |
C.参加反应的甲、丙的质量比为1:2 |
D.反应中,若容器内甲的质量为0.5g,则丁的质量为6.25g |
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