Which classification contains both, conductors and nonconductors, elements with luster and dull, and with varying melting points?

This chart represents the melting point of several substance. what besy explains the high melting point of the salt?

If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million

*will mark you brainliest + 15 points ** why does the equilibrium of a system shift when the pressure is increased? a. to maximize the stress on the system b. to stop restoring equilibrium to the system c. to increase the total moles of gas in the system d. to decrease the total moles of gas in the system