A hypothetical element X has only two stable isotopes X1 (34.969 amu) and X2 (36.966 amu).  X1 has a natural abundance of 75.77%.  Calculate the average atomic mass of the element.  Mark your answer next to words “Final answer is”.  You must follow significant figure rules.  Show your work here to receive full credit.

A particle travels at a very high speed of 2.998×108 meter/second.  What is its speed in terms of miles/minute? (1 minute = 60 seconds)   Mark your answer next to words “Final answer is”.  You must follow significant figure rules.  Show your work here to receive full credit.

What’s number of significant digits in 0.02204010 g of water?

You put a 0.05% glucose solution inside dialysis tubing and tie the ends with thread.  This 0.05% solution is then lowered into a beaker containing a 5% solution of glucose.  Assuming the dialysis tubing is permeable to water but not glucose, what will happen and why?

Ted the Student is studying the number of people brought to the Emergency Room as a function of time of day.  Above are some of his data, for one day this week.  How should Ted graph these data?

You place a 34.60 g of gold bar into a graduated cylinder containing 24.0 ml of water.  What’s the final volume of water level in the graduated cylinder?  (Density of gold is 19.32 g/mL) Mark your answer next to words “Final answer is”.  You must follow significant figure rules.  Show your work here to receive full credit.

Which element is  an alkali metal ?

An atom that gains two electrons is

 If I make a 1-molar solution of sugar and a 1-molar solution of starch, which is true?

In the U.S, full-time working women annually earn ____ of what full-time working men make.