If it takes 450 J of energy to melt 5 g of a substance, how many joules would be needed to melt 15 g?

A. 9000 J

B. 6750 J

C. 2250 J

D. 1350 J

Which example best represents an interaction of atmosphere and hydrosphere. A clouds form, b sunlight is reflected off the upper atmosphere, c precipitation forms, d water from a lake evaporates

A sample of a compound contains 30.0 g C and 5.05 g H. Its molar mass is 78.12 g/mol. What is the compound's molecular formula? CH C2H2 C6H6 C6H

If measurements of a gas are 75l and 300 kilopascals and then the gas is measured a second Time and found to be 50L describe what had to happen to the pressure

Which element is a solid at STP and a good conductor of electricity? (1) iodine (3) nickel (2) mercury (4) sulfur

A solution of aqueous ammonium sulfate has a mass of 482 grams. Calculate the mass of ammonium sulfate in solution if the mass percent of the solute is 11.1%

Which atom can accommodate an octet of electrons but doesn't necessarily have to?

Heat is an exchange of internal energy from one system to another due to A. a temperature difference between the systems. B. one system being gas and the other being solid. C. the systems having the same temperature. D.

Sierra did 500 J of work to move her couch. If she exerts 250 N of force on the couch, how far did she move it? (Work: W = Fd) 0.5 m 2 m 250 m 750 m'

Lead (ii) sulfide (pbs) has a ksp of 3.0 * 10-28. what is the concentration of lead (ii) ions in a saturated solution of pbs? 1.7 * 10-14m 1.5 * 10-14m 3.0 * 10-14m

A 2.17 gm sample barium reacted completely with water what is the equation for the reaction how many milliliters of dry H2 evoled at 21degree celcius and 748mm of Hg?