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.
1 To understand why salt dissolves, we need to look at salt and water on the molecular level. 2  Salt (NaCl) is made from a positive sodium ion (Na +) and a negative chloride ion (Cl 3  -). Since positive and negative attract, the sodium ion and the chloride ion form an ionic bond, which results in NaCl.