What is the mass of an atom that has 10 protons, 13 neutrons, and 10 electrons?

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

How can a give a full method for the experiment of separating sand from water by filtration? 1-materials 2-steps 3-conclusion also for water and salt separated by the evaporation or distillation process