A sample of K2Cr2O7 dissolved in water contains 2,66 g of potassium. Calculate the number of potassium ions that have dissolved in the water. [6]

Which statement describes covalent bases? they have hydroxide ions. they produce hydrogen ions. they are often amines. they are named the same as ionic compounds.

Surface currents are caused by blank space . question 14 options: surface currents are caused by? differences in water temperature high salinity differences in density wind forces

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?