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Which of these atoms has the largest number of neutrons in the nucleus? (a) <sup>148</sup>Eu (b) <sup>157</sup>Dy (c) <sup>149</sup>Nd (d) <sup>162</sup>Ho (e) <sup>159</sup>Gd
d,e
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1. Calculate the pH of the solution with (H<sup>+</sup>)= 1.0 x 10<sup>-3</sup> 2. Calculate the pH of the solution with (H<sup>+</sup>)= 3.6 x 10<sup>-5</sup>
pH= -log[H+]pH= -log[1×10^-3]pH= 32) pH= -log[3.6×10^-5]pH= 5-log3.6pH= 4.44
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If AgCN is added to water it found however, that 1 liter of solution contains x mole of AgCN, the solubility product is a) 4x<sup>3 </sup>b) x<sup>2</sup> c) x<sup>4</sup> d) 27x<sup>5</sup>
a) 4x3
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The pH of a 0.01M solution of a weak base is 10.65. What is the value of <i>K</i><sub><i>b</i></sub> for this base? 1)2.0 x 10<sup>-5</sup> 2)5.0 x 10<sup>-4</sup> 3)5.0 x 10<sup>-20</sup> 4)0.073
Kb-the degree of dissociation of the solution into ionsRight variant: 4
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A sample of oxygen occupies 47.2 litres under a pressure of 1240 torr at 25<sup>o</sup>C. What volume would it occupy at 25<sup>o</sup>C if the pressure were decreased to 730 torr?
In this question, temperature, T does not change (is constant) hence only pressure, P and volume, V changes.In that case we apply Boyle's Law, P1V1=P2V2P1=1240 torrentP2=730 torrentV1=47.2 LV2 = P1V1/P2...
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<sup>?</sup><sub>?</sub>? +<sup>14</sup><sub>7</sub>N ⇒ <sup>17</sup><sub>8 </sub>O+ <sup>1</sup><sub>1</sub>H<sub> </sub>
147N+42He→178O+11H714N+24He→817O+11H is an example of a fission reaction
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Identify the 4 quantum numbers from the given electronic configurations a. 3p<sup>3</sup> b. 5p<sup>5</sup> c. 4s<sup>2</sup> d. 3p<sup>1</sup>
Energy (n), angular momentum (ℓ), magnetic moment (mℓ), and spin (ms).
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If S1 , S2 , S3 S4 are the solubilities of AgCl in water , 0.01M CaCl2 , 0.01M NaCl 0.5M AgNO3 solutions, respectively, then arrange S1 , S2 , S3 S4 in increasing order. plz quick help?
Solution: Solubility depends on the nature of the solvent and solvent, temperature and pressure. In our case, the solubility has this dependence: S2<S1<S4<S3 Answer: S2<S1<S4<S3.
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A gas at 40<sup>o</sup>C, occupies a volume of 60 cm<sup>3</sup> . What volume would the same gas occupy at 55<sup>o</sup>C, at the same pressure?
V1/T1 =V2/T20.06 m3 / 313 K = V2 / 328 KV2 = 0.063 m3 = 63 cm3
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1. Rank the solutions below in order of increasing acidity.
a .0.01M CH3COOH
b. 3M NH3
c. 0.01M H2SO4
d. 0.1M HCl
e. 0.1M NaOH
Answer. ebadc
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