英文化学题 急急急
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第一题是B，三升的水和9mol的stock就是3mol/L
Express your answer as a chemical equation. Identify all of the phases in your answer.
1. CaCO3(s) ---（heat）----- CaO(s) + CO2(g)
2. K2SO4(aq) + BaCl2(aq) ----（啥都不用）---- BaSO4(s) + 2 KCl(aq)（加个2）
multiple choice
1. A semipermeable membrane is placed between the following solutions. Which solution will decrease in volume?
A. Solution A: 3.6 % (m/v) starch
B. Solution B: 4.3 % (m/v) starch
选A，因为Aconcentration高，水分子都跑到B里面去了
2. A semipermeable membrane is placed between the following solutions. Which solution will increase in volume?
A. Solution C: 5.13 % NaCl
B. Solution D: 11.2 % NaCl
选B，A的水分子跑到B里面了，B的体积增大。
3. A red blood cell has been placed into each of three different solutions. One solution is isotonic to the cell, one solution is hypotonic to the cell, and one solution is hypertonic to the cell. Sort each beaker into the appropriate bin based on the cell's reaction in each solution.
red cell不变形，solution is isotonic
red cell变shrink（缩起来了），solution is hypotonic
red cell变涨起来了expand or break down，solution is hypertonic
希望能帮到你！
