A control in an experiment typically refers to the control group, which is the group that is not being exposed to the element or factor being tested. The other group is the experiment group. The only difference between the two groups should be the experiment factor.
According to About.com, controlled experiments have several strengths and weaknesses. One of the strengths of having a control group is that it allows causation to be established. It also singles out individual determinative factors since all other factors are constant. However, controlled experiments tend to be artificial; that is, they are typically done in a laboratory and do not account for many natural responses. Therefore, controlled experiments need to be evaluated in order to determine the extent to which the artificial setting has influenced the outcome.Learn More
A graduated cylinder is one instrument used to measure volume. Graduated cylinders are available in several sizes. The user reads the volume from the bottom of the meniscus, the curve at the surface of the liquid.Full Answer >
Types of chromatography are different methods of separating mixtures under laboratory conditions. There are about a dozen types of chromatography, but five are used most frequently: adsorption chromatography, partition chromatography, ion exchange chromatography, molecular exclusion chromatography and affinity chromatography.Full Answer >
Flame photometers work by separating a chemical sample into its constituent atoms and molecules and then analyzing the colors emitted by the chemicals as they absorb and then release energy. Flame photometers are most commonly used in inorganic chemistry as a way of detecting and identifying the compounds present in metal salts.Full Answer >
The Molisch test is used to detect carbohydrates.The test can also be used to identify compounds that can be dehydrated to furfural in the presence of sulfuric acid.Full Answer >