16. A student in the laboratory performs the following measurements: Step of procedure Values recorded Mass of weighing

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16 A Student In The Laboratory Performs The Following Measurements Step Of Procedure Values Recorded Mass Of Weighing 1 (74.65 KiB) Viewed 33 times

16. A student in the laboratory performs the following measurements: Step of procedure Values recorded Mass of weighing boat 0.349 Mass of weighing boat + solid 12.75 g Volume of water in graduated cylinder 0.72 mL Volume of water after adding the solid 9.65 ml Based on data provided, the student calculates the density of the solid. How should the answer be reported to the correct number of significant figures? a. 1.389 g/mL b.25 g/ml c. 1.400 g/ml d. 14 g/ml e. 1.39 g/mL 17. The atomic line spectrum of Hydrogen consists of emissions in different regions, but four lines are observed in the visible region of the electromagnetic spectrum. Emissions are observed at 656 nm, 486 nm 434 nm and 410 nm. These emissions are for electrons landing in the second energy level from the following energy levels, n=3, 4, 5 and 6. Predict the wavelength that corresponds to the transition from n=3 to n=2 No calculations needed a. 410 nm b. 434 nm c. 656 nm d. 486 nm 18. One of your friends wanted to reward himself for all the hard work of this very difficult year and decide to get 2-carat total weight diamond earrings. The carat is the unit of mass used by jewelers. One carat is exactly 200 mg. The value of diamond depends on the purity and quality of the diamond. A 2-carat rock goes for $18,000 - $22,000. As you are a scientist you ponder why spend so much money as diamonds are nothing else than a. nickel in its purest form b. platinum in its purest form C. carbon in its purest form d. a combination of elements 19. Your house/apartment is being remodeled and you are trying to help your parents figure out some things. The living room has to be painted and your mother is trying to figure out how much paint to purchase. As you performed this type of calculation in class, you tell your mom not to worry about it because you can figure it out. The design of your place is open-space and you noticed that there are only two walls that needs painting The dimensions of the walls are 12 ft by 10 ft and 14 ft by 10ft. what is the total area that needs painting in ft2? a. 7,5 x 10412 b. 6.2 x 10-12 c. 520 ft d. 260 ft