I)Write the chemical formulae of following compounds. a. Magnesium chloride b. Potassium oxide

ii) Balance the following chemical equations.

a. Mg + O2 --->MgO

b. Ca + HCl--->CaCl2 + H2

Idon’t know how to solve this question

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?