Chemical elements that do not exist in nature but can be created in the laboratory are known as synthetic elements. Moscovium (Mc), a synthetic element with atomic number 115, was first synthesized in 2003. A
hypothetical mass spectrum for a sample of Mc containing 10 atoms is shown below.
8
289.2
Number of atoms
288.2
290.2
287
288
289
290
291

Based on the law of conservation of energy, which statement is false? answer- energy is lost when machines dont work right

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н,о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.