How is diffusion used by cells? (Missed this lesson in school)

What is the mass of 5.30*1021 platinum atoms?

Why is copper extracted from ores containing low percentage of copper compounds

How many grams of O2 are produced as 0.033 mol of water decompose

The technique of separation employed to purify an organic solid that may be contaminated by impurities is called _.

A glass object receives a positive charge by rubbing it with a silk cloth. In the rubbing process, have pro - tons been added to the object or have electrons been removed from it?

An atom of oxygen (atomic number 8) with an atomic mass of 16 would have how many neutrons?

Chlorophyll reflects which of these colors? a. red b. blue c. green d. yellow

Extracting oil from shale deposits a has been initiated on a large scale in the United States and will soon surpass Canada's production. b involves removing and refining waxy hydrocarbons called kerogen.

Which shows the levels of organization within an ecosystem from largest to smallest?

the physical properties of 10 grams of iron are the same as the ___ properties of 20 grams of iron a) reactive b) physical c) chemical