How much heat (Q) is lost by a 10.55 g piece of steel (c = 0.466 J/gC) that is cooled from 1200.0 C to 40.0 C? Equation: Q = mc(T-T) Be careful about sign!

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.

How many moles of potassium hydroxide are needed to completely react with 2.94 moles of aluminum sulfate

Jenny places a strip of ph paper into a solution. when she removes the ph paper, it has turned yellow-green. what should jenny do next to determine the ph of her solution? a. use a different testing method because the ph paper should not change colors b. place the ph paper into a machine that reads the ph of the solution c. compare the ph paper's color with the color of ph paper from another solution d. compare the ph paper's color with a chart of colors and ph ranges