Since Charles performed an investigation in his classroom in which he measured the freezing point of 250 mL of water, the type of investigation that Charles perform is known as option C: laboratory experiment.
The term Laboratory experiments is known to be a term that connote any for of research method which is one where researchers are known to make controllable environments so that they can be able to test hypotheses.
Note that Laboratories are known to be used for academic research such as rooms or specifically set up spaces.
Therefore, based on the above, one can say that since Charles performed an investigation in his classroom in which he measured the freezing point of 250 mL of water, the type of investigation that Charles perform is known as option C: laboratory experiment.
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Charles knows that adding salt to water causes the freezing point of water to be lowered, but he wants to know if rock salt affects the freezing point more than table salt. Charles performed an investigation in his classroom in which he measured the freezing point of 250 mL of water. He used this measurement as his control. Then, he dissolved equal amounts of rock salt and table salt in two identical 250 mL beakers of water. Finally, he measured the freezing points of each beaker of water, analyzed his results, and formed a conclusion. What type of investigation did Charles perform? A. observational field study B. collection of specimens C. laboratory experiment D. model-building
