** I need help with these questions! Thank you** I will rate you! 24. A student
ID: 103373 • Letter: #
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** I need help with these questions! Thank you** I will rate you!
24. A student was required to determine the empirical formula of a compound composed of elements X and Y. The number of moles of X was determined to be 1x1o and the number of moles of Y is 5x 103. The empirical formula is a. XY2 b. XY 25. a. single displacement b. Decomposition When an acid and base are mixed (NaOH and HCI) a reaction takes place. c. synthesis d. neutralization 26. All of the following are soluble salts except a. KBr c. LiNO d. NH4Br b. AgCI 27. This would be an expression that describes a basic solution a. pH 7 b. pH>7 c. pH-7 28. Mass of empty graduated cylinder Volume of Water Mass of graduated cylinder and water Mass of water 67.5392 g 50.0 mI 115.7126 g 48.1734 g Examine the data collected to determine the density of water. The density expressed to the correct number of significant figures is a. 0.96347 b. 0.9635 mL c. 0.964 d. 0.96 2 9. Write a balanced equation for the combination reaction that takes place when iron (III)oxide is formed from its constituent elements a. Fe + 03 FeO b. Fe2+O3 Fe2O3 30. All of the following are pieces of glassware designed to deliver accurate volumes of liquid except c. Buret d. graduated cylinder a. Beaker b. Pipet A stock solution of 0.5M CoCl2 was diluted to produce 100mL of a 0.1M solution. You would need a. 80, 20 31. mL original solution and addml of water? c. 20,80 d. 40, 10 b. 10, 40Explanation / Answer
Answer of 24
Option C - X2Y
since mole of X divided by mole of Y will give 2, means two moles of X is used in formula with respect to Y
Answer for 25
d - neutralisation reaction
Reaction between acid and base gives water and salt. because both are strong, they produce salt as neutral, and water is always remains neutral.
Answer for 26
b --AgCl
Because AgCl has a covalent bond between Ag and Cl, its solubility is negligible even at 50o C.
Answer for 27
b - pH > 7
At pH scale less than 7 is acidic in nature , more than 7 is basic in nature and 7 is neutral
Answer for 28
a --0.96347
density = mass/volume , 48.1374/50 = 0.96347
Answer for 29
c ---- 4Fe + 3O2 = 2 Fe2O3
Answer for 30
a --- beaker
Answer for 31
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