er monitoring the temperature of 25 mL of DI water in a styrofoam cup for 180s,
ID: 590973 • Letter: E
Question
er monitoring the temperature of 25 mL of DI water in a styrofoam cup for 180s, a 2.00 g sample of HCO3 is added with stirring. The temperature of the mixture is recorded for an additional 300 s. What ture describes how the temperature changes with time? B) C) D) E) Temp bme (A When solid blue copper(Il) sulfate pentahydrate is heated in a test tube what products are formed? A) CuSO4is), H202) B) Culs). H20R), H2S04(aq) C)Cuof(s), H2804(aq) D) CuSO4(s). H2(g), H20() E) Cu(OH2(s), H20(R) 12) 7) A square prism measures 274 along one edge of the square face and 1053 cm in length what is the best way to report the volume of the square prism to the correct number of significant figures knowing that the volume of a square prisma is V52R 13) V A) 7.9 X 10l cm3 B) 79.055028 cm3 C)79.1 am3 D) 79 cm3 E) 79.06 cm3 energy of 2.89 x 10-19 8) What is the wavelength in nm of a photon that has an B) 6.61 X 10o14 C102 X 103 D) 454 X 102 E)689 x 102 A) 685 X 1025 14) 5g 9) Classify the following reaction 21Kuaq) BaSO4(s) + + soaaq) BaCl2(aq) A) decomposition B) combustion C) single displacement D) combination E) double replacement 15) Aci A) B) D) I E) 16) The w A) 5Explanation / Answer
Ans 5 A)
The graph shown in option A correctly depicts the temperature changes in the styrofoam cup.
As soon as NaHCO3 is added into the water , it gives out heat into the solution , forming carbonic acid H2CO3 . Later the reaction mixture cools down as it liberates CO2 gas.
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