a) (4) How many joules are there in 100.0 Cal of energy? b) (3) 250 joules of energy is equivalent to how many calories? c) (8) Silicon reacts with chlorine gas to produce silicon dichloride and 425 kJ of energy. Write a thermochemical equation for the reaction. Is the reaction endothermic or exothermic? Why? d) (4) How much energy would be transferred if 75.0 g of chlorine gas reacted during the reaction in Part C. e) (8) Iron (II) oxide reacts with carbon monoxide in the presence of 67.2 kJ of energy and produces carbon dioxide and iron. Write a thermochemical equation for the reaction. Is the reaction endothermic or exothermic? Why? f) (4) What mass of carbon monoxide reacted is 547 kJ of energy is available for the reaction in Part E?​

Margaret wants to make an orange flavored drink by stirring powdered drink mix into a glass of water. she doesn't like drinks that have small clumps of powdered solid in them, so she wants the drink to be a perfect solution. what factors should margaret not consider when deciding how much powder to add to her glass of water?

Using data from seismic waves, geologists have learned that earth’s interior is made up of several

Nconcentration refers to the molar concentration of an ion in solution. it may be identical to, or greater or less than, the molar concentration of the compound containing the ion that was used to make the solution. for soluble salts, the molarity of a particular ion is equal to the molarity of that compound times the subscript for that ion. for example, 1 m of alcl3 is 1 m in al3+ and 3 m in cl−. 1 m of (nh4)2so4 is 2 m in nh4+ and 1 m in so42−. part a what is the concentration of k+ in 0.15 m of k2s? view available hint(s) nothing m m part b if cacl2 is dissolved in water, what can be said about the concentration of the ca2+ ion? view available hint(s) if is dissolved in water, what can be said about the concentration of the ion? it has the same concentration as the cl− ion. its concentration is half that of the cl− ion. its concentration is twice that of the cl− ion. its concentration is one-third that of the cl− ion. part c a scientist wants to make a solution of tribasic sodium phosphate, na3po4, for a laboratory experiment. how many grams of na3po4 will be needed to produce 550 ml of a solution that has a concentration of na+ ions of 0.700 m ? express your answer numerically in grams. view available hint(s) mass of na3po4 n a 3 p o 4 = nothing g provide feedback