In the modern Periodic Table of the Elements, in order of what property are the elements arranged? atomic number?
date of discovery?
number of neutrons?
Reactivity with hydrogen?

Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.

What amount of heat is exchanged when 106.2 grams of substance y goes from a liquid at 35 degrees celsius to a solid at the same temperature? melting point of substance y = 35 degrees c; δhvaporization = 3.67 j/mol; δhfusion = 3.30 j/mol. mwsubstance y = 28.22 g/mol. −12.4 j −3.51 x 102 j 1.24 x 101 j 351 j

When a device is used in a circuit in which the voltage is 81 v the current flowing through the device is 3 a what is the resistance of the device