What is the percent by mass of NaF in a solution that contains 15.8 g NaCl per 1000.0 g of water?

On a distance vs time graph the line of an object at rest is a

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change