Chỉ dùng thêm dung dịch HCL hãy nêu cách nhận ra từng chất rắn đựng trong các lọ mất nhãn sau Na2CO3 , NaCl , BaSO4 , CaCO3

Which statement accurately describes the relationship between air pressure, air density, or altitude? as altitude increases, pressure increases.as altitude increases, air density increases.air pressure and density are lowest at sea level.denser air exerts more pressure than less dense air.

What type of reaction is shown below? check all that apply. 2h2o2 → 2h2o + o2 synthesis decomposition combustion

Which process describes vaporization that takes place below the surface of a liquid? condensation melting boiling evaporation