I. Find the molar mass for each compound. Round to the nearest percent. 1) Iron (II) oxide

2) C6H12O6

3) Carbon dioxide

4) Calcium carbonate

II. Convert from grams <---> moles and vice versa

1) 72.06 g of C to moles

2) 3.5 moles of H2O to grams

3) 63.9 g of CH4 to moles

4) 5.8 moles of CaCO3 to grams

Which is an example of a reversible physical change?

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.

The semi-conductors on the periodic table are classified as