1.简单
由液体变为气体的变化叫什么?
- A蒸发(汽化)
- B凝结
- C熔化
- D凝固
由液体变为气体的变化叫什么?
在盐溶液中,盐称为什么?
What is the chemical formula of carbon dioxide?
A plastic block has a density of 0.8 g/cm³. What happens when it is placed in water (density 1.0 g/cm³)?
Which coefficients balance __KClO₃ → __KCl + __O₂?
A bag of 5% (w/v) glucose solution (called 5% dextrose in the US) contains 5 g of glucose per 100 mL. How many grams of glucose are in 1 L?
糖溶解在水中时,为什么不是化学变化?
下列哪个方程式配平正确?
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