How to draw a model of CaO

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.

Which of the following is a physical change? a.burning a piece of wood b.sawing a piece of wood in half c.rust forming on an iron fence d.a copper roof changing color from orange to green

What is the final volume in milliliters when 0.641 l of a 34.0 % (m/v) solution is diluted to 23.5 % (m/v)?