There are two isotopes of element A. Information about the two isotopes is shown in the table below.

Mass number of the isotope
6
7

Percentage abundance
92.5
7.5

Use the information in the table above above to calculate the relative atomic mass of element A.
Give your answer to 2 decimal places.













Relative atomic mass =

(4)

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

An atom of lithium (li) and an atom of chlorine (cl) engage in a chemical reaction. which correctly describes the structure of the resulting chemical compound? hint: consider the class of each element. the chemical compound will have a network structure. the chemical compound will have triple bonds. the chemical compound will have a ball-and-stick structure. the chemical compound will have double bonds.

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt