What United States agency regulates what dyes can be used in foods, drugs, and cosmetics?

Ethan is observing chemical and physical properties of a substance. He heats a substance and observes that the substance turns from a brown solid to a black powder.

What type of radiation has the least amount of energy? A. alpha radiation B. Beta radiation C. Gamma radiation D. X-rays

Barium and nitrogen form two binary compounds containing 90.745% and 93.634% barium, respectively. Determine the empirical formulas of these two compounds.

In an experiment, a 2.514-g sample of calcium was heated in a stream of pure oxygen, and was found to increase in mass by 1.004 g. Calculate the empirical formula of calcium oxide.

Treatment of (S) - () - 5-methyl-2-cyclohexenone with lithium dimethylcuprate gives, after protonolysis, a good yield of a mixture containing mostly a dextrorotatory ketone A and a trace of an optically inactive isomer B.

A red blood cell contains 4.0 107 free electrons. what is the total charge of these electrons in the red blood cell?

The coefficients in a chemical equation? A; show the valence electrons for each atom B; are the molar masses of the substances C; show the number of grams of each substance that react D; indicate the number of moles of each substance that react

In a hypothetical garden each of the identical trees consist of 11 branches and each on a tree consist of 35 leaves. How many trees would have 8,085 leaves?

If you were an energy source, which energy would you be? why?

Choose the correct answer from the options given. Ethanol can react with hydrochloric acid to form chloroethane and water. When sulfuric acid is added, the reaction proceeds more quickly.