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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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What mass of liquid water can be heated from freezing to boiling with 42.6 kJ of energy, if the specific heat of water is 4.2 J g <sup>-1 </sup> <sup>o </sup>C <sup>-1 </sup>?
Freezing point of water = 0°CBoiling point of water = 100°CCwater = 4.2 Jg-1°C-1q = m × c × ∆T m = q/∆T × c= 42.6/(100-0) × 4.2= 0.01g
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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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Four moles of water molecules contains: A) 36 g of water B) 4.816 x 10<sup>24</sup> oxygen atoms C) 2.408 x 10<sup>24</sup> hydrogen atoms D) 2.408 x 10<sup>24</sup> molecules of water
D) 2.408 x 1024 molecules of water
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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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A container of 10 litres has a volume expressed in m<sup>3</sup> A. 1m<sup>3</sup> B. 0.01m<sup>3</sup> C. 0.001m<sup>3</sup> D. 0.0001m<sup>3</sup>
1 cubic metre =1000 litres10l = 1×10/1000 = 0.01B. 0.01m3
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Find the amount of energy required to raise the temperature of 9.19 g silicon from 18 <sup>o</sup>C to 58 <sup>o</sup>C s<sub>Si</sub> = .71 J/g<sup>o</sup>C
Solution:q = m × C × ΔTq = m × C × (Tf - Ti),where:q = amount of heat energy gained or lost by substancem = mass of sampleC = specific heat...
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an element A has following isotopic composition; <sup>56</sup>A : 60%; <sup>58</sup>A : 30%; <sup>59</sup>A : 10% then average atomic mass of element A will be
Average atomic mass of element A: (56 x 60 + 58 x 30 + 59 x 10) / 100 = 56.9
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