Becky wants to model an ecosystem. Which of the following modeling tools would best help her illustrate an ecosystem? A.
a rubber ball
B.
a terrarium
C.
a map
D.
a set of building blocks

You are performing an experiment in a lab to attempt a new method of producing pure elements from compounds. the only problem is that you do not know what element will form. by your previous calculations you know that you will have 6.3 moles of product. when it is complete, you weigh it and determine you have 604.4 grams. what element have you produced?

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?