An unknown substance has a volume of 6.7 cm3 and a mass of 75.7g. What is the density of the substance? If the density of lead is 11.5g/cm3, could the unknown substance be lead?

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

Will a solution form when the solvent and solute are both nonpolar? a. not likely b. never c. most likely