2. identify items in your life that are made of each type of element: metal, nonmetal, and metalloid. for each item, explain why the properties of that type of element are necessary for the function of that item.

example: metal: my curling iron has metal in its wires and on the barrel of the iron. the metal wires are necessary to conduct electricity and the metal on the barrel is necessary to conduct the heat that causes my hair to curl.

metal:

nonmetal:

metalloid:

What layer of the atmosphere is directly above the troposphere?

After watching the video "zinc strip in copper nitrate solution", and reading the instructions, click on the link labeled "start" just below the drawing of the pencil tip. follow the direction to complete the 3x3 grid. answer the below questions for the portion of the activity in which sn(s) is placed in agno3(aq)

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.