An example of a physical property of an element is the element's ability to what?

Balance this equation co2(g) + h2o (g) show that the balanced equation obeys the law if conversation of mass

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

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.