Which of the following represent(s) a 2 mol/L solution?
I. A 200 mL sample of a 10M solution
II. 58.45g of NaCl in 500mL of solution
III. 2 moles of NaCl in 1000mL of solution
O
I and II
O
II and III
O
III only
O
I, II and III

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world

Which statement is true about the model of the electromagnetic spectrum a: it change the frequencies of light. b: it compare wavelengths of light. c: the color of light waves can be changed using the model. d: the intensities of light waves can be decreased using the model.

Which of the following occurs along coasts during the day?