A very common question I get is âhow much is concrete per yardâ? It is a somewhat difficult question to answer because suppliers are frequently changing their prices, and there are many different pricing factors. However, in general the cost per yard as of today (March 29, 2011) is as follows: 2500 psi (I never use this) = $95-110 (Charlotte NC Metroâ Concrete Contractor Average) 3000 psi (most common) = $100-115 (Charlotte NC Metroâ Concrete Contractor Average)
Electrolytes are compounds which produce ions when in water. Soluble ionic compounds do this by breaking up into the constituent ions in water. But if the ionic compound is not soluble, such as lead chloride, then the compound does not break up into ions, and is thus not an electrolyte.
2 7 Ionic and Molecular Compounds â¢ An ionic compound consists of oppositely charged cations and anions. Usually the cation is a metal and the anion is a nonmetal or a group of nonmetals. (ie, NaCl) â¢ A molecular compound consists of two or more different nonmetals.It exists as a discrete unit of atoms.(ie, CO 2) 8 â¢ NaCl is an ionic compound â¢ CO 2 is a molecular compound â¢ O 2 is a molecular element Figure 3.07 9 Identifying Ionic and Molecular Compounds Identify each compound as ionic or molecular.hen compounds containing ions dissolve in water, the ions exist separate from each other. The mobility of ions allows for a current to pass through water. Figure 3.03 5 Electrolytes â¢ Solutions containing ions are electrolytes. â¢ Sodium chloride dissolved in water is an electrolyte.