You either would have taken it voluntarily or someone slipped it into something you were smoking (like a joint.) Urine tests don't lie. Bars and wild parties are notorious for 'date rape drugs' as well as slipping other drugs into drinks, getting the person so drunk they are talked into snorting cocaine, or, the person taking it is in denial.
A positive Molisch's test result indicates the presence of carbohydrates.
cellulose and starch
In a titration, a known concentration of a substance (titrant) is added to the unknown substance until a chemical reaction reaches completion. By measuring the volume of titrant required to reach a specific endpoint, the concentration of the unknown substance can be calculated using the stoichiometry of the reaction.
unknown
what is the unknown substance of a glass of milk for a week
You think probable to an atom.
Knowing the solubility of an unknown substance in water can help you calculate its molarity. It is however important to get its weight first.
Sodium carbonate can react with acidic components in the unknown substance to form carbon dioxide gas, which may result in fizzing or effervescence. This reaction can help identify the presence of acidic compounds in the unknown substance.
Density can be used to determine the identity of a substance by comparing the density of the unknown substance to the known densities of different substances. Each substance has a characteristic density, so if the density of the unknown substance matches that of a known substance, it can help identify the unknown substance.
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Scientists look for properties such as density, boiling point, melting point, solubility, conductivity, and reactivity to help identify an unknown substance. By comparing these properties to known data in a database, scientists can often determine the identity of the unknown substance.