Which statement describes a chemical property? A particular substance evaporates at 30 °C.
A 2 ft. long metal bar has a mass of only 176 g.
A certain heavy metal turns to a liquid at room temperature.
A metal is added to a beaker of water, and the beaker explodes.

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

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.

Connect the whole numbers on the periodic table to indicate what they represent?