12. What would be the best compound to use on an acid spill in a lab? A, H B. Na

Question

12. What would be the best compound to use on an acid spill in a lab? A, H B. NaOH C. NaHCO D, NH Why is it not advisable to wear contact lenses in the lab? A. 13. Lenses could inadvertently fall out of the eye ?, C. D. Chemical vapor could be cone trapped between the lenses and the eye Chemical vapor could literally react with the lenses All of the above 14. A solution contains 28% phosphoric acid by mass. This means that-_ _- A. 100 mlL of this solution contains 2.8 g of phosphoric acid B. IL of this solution has a mass of 28 g C. D. 100 g of this solution contains 28 g of phosphoric acid IL of this solution contains 28 ml. of phosphoric acid E. the density of this solution is 2.8 g/ml. Select the net ionic equation for the reaction between potassium hydroxide and A KOHaq) Hlaql HOU) D. K(aa) KI(aq) 15. E. K(aq+OH(ag)KOH(aq 16. A chemist needed to calculate the molarity of a salt solution. Which of the following is needed for the calculation? I) Mass of salt added Il) Molar mass of the salt III) Solution volume IV) Volume of water added A. I and I1 B. 1. II, and I1I C. I, III, and IV D. I, I, and IV E. Iand 11I 17. What should be done if a chemical gets in the eye? A. Notify the Instructor; then use the eye-wash fountain B. Use the eye-wash fountain; then return to the experiment C. Use the eye-wash fountain; then notify the instructor D. Nothing, unles the chemical causes discomfort

Explanation / Answer

Hi Student,

12- C.................Because NaHCO3 is weak Base will not react spontaneously with any acid.

13- D.................Nesessary to avoid contact lenses because

Exposure to chemical fumes and vapors.

Areas where the potential for chemical splash exists.

Areas where the particulate matter or dust is in the atmosphere.

Exposure to extremes of infrared rays.

Intense heat.

Dry atmosphere.

Flying particles.

Areas where caustic substances are handled, particularly those used or stored under pressure.

14- C...............% solution will be made by the same way by mass or even by volume also so C is the correct answer.

15- A...............

16- C................Molarity=Mole of solute/liter of solution. Molar mass, solution volume and volume of water added.

17- A...............Notify your instructor first and then wash your eyes.

Thank you

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