An odor or odour is a volatile chemical compound that humans and other animals perceive via the sense of smell or olfaction. Odors are also known as aromas or fragrances and (if they are unpleasant) as reeks, stenches, and stinks. The type of molecule that produces an odor is called an aroma compound or an odorant.
Gasoline consists of a complex mixture of hydrocarbons. Most of these are alkanes with 4-10 carbon atoms per molecule. Smaller amounts of aromatic compounds are present. Alkenes and alkynes may also be present in gasoline. Gasoline is most often produced by the fractional distillation of petroleum, also known as crude oil (it is also produced from coal and oil shale).
Perl's unshift() function is used to add value or values onto the beginning of an array (prepend), which increases the number of elements. The new values then become the first elements in the array. It returns the new total number of elements in the array. It's easy to confuse this function with push(), which adds elements to the end of an array.
Combine mood ring science and slime in this fun and easy color change chemistry project. This is thermochromic slime, which means its slime that changes colors according to temperature. It's simple to make. Color Change Slime Ingredients You can add thermochromic pigment to any of the slime recipes, so feel free to experiment.
Updated for the Half Price Books 2019 Summer Reading Program The Half Price Books summer reading program for kids gives out free Half Price Books gift cards to kids who read for at least 300 minutes during the months of June and July. This program is available to kids preschool through middle school.
In 1936, as the design of the North Carolina -class moved towards finalization, the US Navy's General Board met to discuss the two battleships that were to be funded in Fiscal Year 1938. Though the group favored construction of two addition North Carolina s, Chief of Naval Operations Admiral William H.