How well can you apply Boyle's law to this sample
of gas that experiences changes in pressure and
volume? Assume that temperature and number of
moles of gas are constant in this problem.
Using the first volume and pressure reading on
the table as V1 and P1, solve for the unknown
values in the table below. Remember to use the
rules of significant figures when entering your
numeric response.
A:

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.