Which method of heat transfer warms the air just above hot sand on a beach?

Which metal exist in liquid state and can be cut with knife ?

Identify the electromagnets with poles that are reversed from the electromagnet shown above

What is conserved in the reaction shown below? h2(g) + cl2 (g) --> 2hcl(g)a. mass onlyb. mass and moles onlyc. mass, moles, and molecules onlyd. mass, moles, molecules, and volume