What measure would a chemist in the lab take to ensure correct calculations of amount for the following samples; Methane gas, Sodium chloride crystals and 6moles per litre of hydrogen acid.

How is 0.00235 expressed in proper scientific notation? a. 2.35 × 10-3 b. 0.235 × 10-2 c. 2.35 d. 2.35 × 103

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

Express the following number in scientific notation. 0.026890 =