Which term describes a pure substance that is made up of only one type of atom?

1) matter

2) rock

3) compound

4) element

According to the hess's law, the enthalpy of solution is: δhsoln = δhsolute + δhsolvent + δhmix. considering dissolving a small drop of nonpolar pentane oil in water which term (s) in the equation will experience the largest enthalpy change.

Is the amount of mass given volume

Geneva was walking on the beach on a crisp November morning when a cool wind came her way. How would Geneva's body respond to maintain homeostasis? ) Intro Done

Why are non-metals dull in appearance as solids?

As the first five elements in Group 15 are considered in order of increasing atomic number, first ionization energy (1) decreases (2) increases (3) decreases, then increases (4) increases, then decreases

How are electromagnetic different than all other waves

Find the ratio of speeds of an electron and a negative hydrogen ion (one having an extra electron) accelerated through the same voltage, assuming non-relativistic final speeds. Take the mass of the hydrogen ion to be 1.67*10^{-27} kg.

A type of rock that undergoes changes because of heat and pressure

How many milliliters of a 1.25 molar HCL solution would be needed to react completely with 60 g of calcium metal Ca+2HCl - - > CaCl2 + H2

What mass of copper is required to replace silver from 4. oog ogre silver nitrate dissolved in water