25 g of a chemical is dissolved in 75 g of water. What is the percent by mass concentration of this chemical

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

In an investigation that uses the scientific method, which step immediately follows making a hypothesis? o summarizing the results o asking a question o making observations designing an experiment mark this and retum save and exit next submit

Aroller coaster is traveling at 13 mi./s when you purchase a hill that is 400 m long and down the hill exonerate at 4.0 m/s squared what is the final velocity of the posterior found your answer to the nearest number