Alexa, the voice service that powers Echo, provides capabilities, or skills, that enable customers to interact with devices in a more intuitive way using voice. Examples of these skills include the ability to play music, answer general questions, set an alarm or timer and more.
1 Water can dissolve salt because the positive part of water molecules attracts the negative chloride ions and the negative part of water molecules attracts the positive sodium ions. 2  The amount of a substance that can dissolve in a liquid (at a particular temperature) is called the solubility of the substance.
Ionic compounds can dissolve in polar liquids like water because the ions are attracted to either the positive or negative part of the molecule. Note that there is a sort of tug-of-war involved when things dissolve in water. The water is pulling individual ions away from the solid.