The density of copper is 8.94g/cm3 at 20°C and 8.91g/cm3 at 60°C. This density decrease is the result of which of the following ? State by inserting true or false and give an explanation. a) the metal expand
b) the metal contrast
c) the mass of the metal increase
d) the mass
of the metal decrease

Which ocean zone has the most abundant primary producer and why a) the abyssopelagic zone ,du to the absence of light and cold water temperatureb) the bathypelagic zone, due to the absence of light and cold water temperaturec) the mesopelagic zone ,due to uts high light availability and warm water temperature d) the epipelagic zone,due to its high light availability and warm water temperature

In order to complete this lab. you will need to be familiar with some common chemistry terms. complete the chemical change puzzle and list the relevant terms and their meaning below a.rectant b.product c.supernate

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