I am a highly reactive member of Group 1 that reacts violently in water. I have 20 neutrons. what am I?

A5 mole sample of liquid acetone is converted to a gas at 75.0°c. if 628 j are required to raise the temperature of the liquid to the boiling point, 15.600 kj are required to evaporate the liquid, and 712 j are required to raise the final temperature to 75.0°c, what is the total energy required for the conversion?

Which statement accurately represents the arrangement of electrons in bohr’s atomic model?

0.070g of hydride of carbon occupies 56cm^3 at s. t.p when vaporized and contained 14.29% by mass of hydrogen. what is the formula for the hydrocarbon