State whether each of the following
is exothermic or endothermic
1) Na and H2O

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change. when the temperature in a room increases from 25°c to 33°c, changes from a solid to a liquid. in a lab, methane and nitrogen are cooled from -170°c to -200°c. the methane freezes and the nitrogen . when gold is heated to 2,856°c it changes from a liquid to a .

What is the mass of 8 moles of sodium atoms

What is the independent variable in this investigation? mass volume sample number substance density