80 i need a step by step simple experiment to show that light travels in straight lines until at a point were it enters a new medium.

What is the name of this hydrocarbon?

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Asolution of naoh has a concentration of 25.00% by mass. what mass of naoh is present in 0.250 g of this solution? use the periodic table in the toolbar if needed. 0.0625 g what mass of naoh must be added to the solution to increase the concentration to 30.00% by mass? g