Why are numbers in chemistry expressed in scientific notation?

A chemist requires 0.446 mol na2co3 for a reaction. how many grams does this correspond to?

What information is given by the superscripts in an electron configuration?

When substances are formed that are different from the starting substances, a physical change has occurred. True False

Which observations would have been consistent with Marie Curie's work? Check all that apply. O One gram of a uranium salt has twice the radioactivity as two grams of the same salt.

If an atom is found to have an atomic mass equal to 3 times greater than carbon, what is its atomic mass?

Which type of chemical reaction occurs in 2KClO3 Right arrow. 2KCl + 3O2

An electrochemical cell is constructed using two half-cells: Al (s) in Al (NO2) 3 (aq) and Cu (s) in Cu (NO3) 2 (aq). The two half cells are connected by a KNO3 salt bridge and two copper wires from the electrodes to a voltmeter.

7. If you fill a balloon with 5.2 moles of gas and it creates a balloon with a volume of 23.5 liters, how many moles are in a balloon at the same temperature and pressure that has a volume of 14.9 liters

Which compound is formed from its elements by an exothermic reaction at 298 K and 101.3 kPa?

State one major difference between having a nitrogen atom in a ring structure and having an oxygen atom in that structure