Answer:
A. observing
Explanation:
There are various steps that are involved in a scientific investigation. Observation is the first step of the scientific investigation. In this step, a close examination is laid on the investigation. Observation is collected with the senses and the information is gathered.
In the given excerpt, Clive missed the observation part of the scientific investigation. All the other three steps were followed by Clive. He was not able to observe the situation and so was not able to provide the answers to the questions asked by his classmates.
A substance floats or sinks in another because of its relative density. Take ice floating in water for example. Water is more dense than ice so ice floats.
Mass is incorrect as the buoyancy or ability of an object to float depends on the mass per volume, which is equivalent to density.
Solution because a solution cannot be separated by hand
First convert mL to L:
(500. mL)/(1000L) = .500L
Then convert molarity to moles:
(3.00M)(.500L) = 1.5mol NaCl
Then convert moles of NaCl to grams of NaCl by multiplying it by its molar mass:
(1.5mol NaCl)(58.44g/mol NaCl) = 87.66g NaCl are needed
