A.常温下向NaOH溶液中逐滴滴加水稀释,其pH的变化 |
B.电解水实验,生成两种气体体积的对应关系 |
C.从同一试剂瓶中取出质量相等的两份双氧水(主要成分是H2O2),分解产生氧气的质量变化 |
D.向稀盐酸中加入一小块铜片,稀盐酸质量分数的变化(不考虑盐酸的挥发) |
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