Why can alloys not be described using chemical formulas?
a) alloys are mixtures with undefined proportions
b) alloys are mixtures instead of compounds
c) alloys have a network structure called a crystal lattice
d) alloys have a structure that lacks covalent bonds

Choose all the answers that apply. ionic compounds dissolve easily in water do not dissolve in water have low melting points have high melting points conduct electricity when melted

The combustion of methane, ch4, releases 890.4kj/mol. that is, when one mole of methane is burned,890.4 kj are given off to the surroundings. this meansthat the products have 890.4 kj less than the reactants.thus, ah for the reaction = - 890.4 kj. a negative symbolforah indicates an exothermic reaction.ch (g) + 20 (g)> co2 (g) + 2 h0 (1); ah = - 890.4 kga) how much energy is given off when 2.00 mol of ch,are burned? b) how much energy is released when 22.4g of ch. areburned?

Determine the total number of atoms in 1.0 mol of co2