25.00 ml of heavy water at 20 degrees celcius was pipetted into a 37.234 g beaker. the final mass of the beaker was 64.859 g. what was the density of the water at 20 degrees celcius?

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

What is a metal replacement reaction

Choose all the answers that apply. fluorine (f) has an atomic number of 9 and an atomic weight of 18.99. fluorine has a. 9 protons b. 10 neutrons c. 18 electrons d. an atomic mass of 19 e. at least one isotope