Có 2 lọ mất nhãn chứa 2 chất rắn màu trắng: CaO và P 2 O 5 . Hãy nhận biết chúng bằng phương pháp hóa học ? (2 điểm)

Which of the following is a compound? a.carbon b.oxygen c.hydrogen d.water

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.

How does a coronal mass ejection (cme) affect the solar wind? a cme adds more particles to the solar wind, intensifying it. a cme blocks the solar wind, causing it to fade. a cme does not affect the solar wind but it does affect auroras. a cme increases the amount of energy in the solar wind.