Achemist is hired by a major petroleum company to do research into developing a gasoline mixture that burns more efficiently in automobile engines. this is best described as research.

applied

Explanation:

According to my research on different research methodology, I can say that based on the information provided within the question this is best described as applied research. This type of research focuses on solving a specific and practical problem, in this situation that practical problem is finding a solution in order for gasoline to burn more efficiently.

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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

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.