Where is most of the water on earth groundwater glaciers and ice caps in lakes rivers and wetlands in the oceans

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?