The sodium ion may be abbreviated as Na+ or as simply Na. Sodium can occur as a salt in a crystalline solid. Sodium chloride (NaCl), sodium phosphate (Na2HPO4) and sodium bicarbonate (NaHCO3) are commonly occurring salts. These salts can be dissolved in water or in juices of various foods.
A Reference Point is something you use to determine the position of an object, but the reference point has to be something that doesn't move at all. For Example: A Tree. A Reference Point is something you use to determine the position of an object, but the reference point has to be something that doesn't move at all. For Example: A Tree.
Not all reference points have to be standing still. An example of. a reference point that is moving is when you look out the window of a. car and notice that you are moving faster than the car next to you. The. car next to you is moving, it is just moving slower than your car. You. use that other car as a reference point to determine that your car is. moving.