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.

A hypothetical element X has only two stable isotopes X1 (62.9296 amu) and X2 (64.9278 amu).  X1 has a natural abundance of 69.17%.  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 new car has a fuel efficiency of 15.6 kilometers per liter.  What is its fuel efficiency in miles per gallon?   Mark your answer next to words “Final answer is”.  You must follow significant figure rules.  Show your work here to receive full credit.

A liquid boils at a very low temperature of -321 oF.  What’s the equivalent temperature in terms of Kelvin (K)?     Mark your answer next to words “Final answer is”.  You must follow significant figure rules.  Show your work here to receive full credit.  

A hypothetical element X has only two stable isotopes X1 (62.9296 amu) and X2 (64.9278 amu).  X1 has a natural abundance of 69.17%.  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 new car has a fuel efficiency of 15.6 kilometers per liter.  What is its fuel efficiency in miles per gallon?   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 0.3004000 g of water?