How many significant figures are in the measurement 40, 500 mg? a) two b) three c) four d) five

Nitrogen family - 5 valence electrons

What qualities can be used to identify binary covalent compounds?

Is Light a Wave or a Particle?

Element X is a solid that is brittle, lacks luster, and has six valence electrons. In which group on the Periodic Table would element X be found? (1) 1 (3) 15 (2) 2 (4) 16

An iron fence is left unpainted, and it reacts to the oxygen in the air, forming rust. the formation of rust is an oxidation-reduction reaction, but it also is an example of a?

What is the mass of 4.6 moles of helium gas?

In the process of ionization, what is the relationship between the second ionization energy and the third ionization energy?

What are examples of convection?

Find the mass of 1 mole of cuprous oxide, or cu2o. assume the atomic mass of copper is 64 and oxygen is 16.

Ice (H2O) melting at 273 K and 1 atm has = 6.01 kJ/mol and = 6.01 kJ/mol while water vaporizing under the same conditions has = 37.6 kJ/mol and = 40.7 kJ/mol. Why is there such a large difference between and, but not for and?