Two substances, a and z, are to be identified. substance a can not be broken down by a chemical change. substance z can be broken down by a chemical change. what can be concluded about these substances?
(1) both substances are elements.
(2) both substances are compounds.
(3) substance a is an element and substance z is a compound.
(4) substance a is a compound and substance z is an element.

Five students had to answer the question how are elements arranged in a periodic tabledamon: i think the elements are arranged by increasing massflo: i think the elements are arranged according to their properties sienna: i think the elements are arranged by when their discovers kyle: i think the elements are arranged according to how common they areglenda: i don't agree with any of themwho is right

There are main groups in the modern periodic table of elements

Complete the following statements to describe solids, liquids, and gases. select the correct answer from each drop-down menu. a solid a definite volume and a definite shape. a liquid a definite volume and a definite shape. a gas a definite volume and a definite shape