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brilliants [131]
3 years ago
8

If you pump air into cycle tyre a slight warming effect is noticed at valve stem why

Chemistry
1 answer:
SSSSS [86.1K]3 years ago
8 0
Probably the kinetic energy of rubbing the pump against the valve, combined with the increase in gas pressure in the tire itself.
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Which information about a chemical reaction is provided by a potential energy diagram?
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An energy profile of a reaction tells you whether it's endothermic or exothermic, the energy of the products and reactants, the activation energy needed for the forward (Ea) and reverse (Ea') reactions, the change in energy (∆E), and the energy of the activated complex.
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What is the rate of the reaction when the initial concentration of no is 0.400 m and that of br2 is 0.245 m ?
Hoochie [10]
If the final concentration of NOBr = 0.250M
Change in concentration of NOBr = +0.250 M
Change in concentration of NO = -0.250 M
Change is concentration of Br2 = -0.125 M ( since number of moles of Br2 is 0.5 times the number of mole of NOBr)
Final concentration of NO = 0.400-0.250 = 0.150 M
Final concentration of Br2 = 0.245 - 0.125 M = 0.0120 M
Therefore;
Kc = conc (NOBr)^2/ ((conc NO)^2 ×(conc (Br2)
     = (0.250²)/(0.150²×0.120)
      = 23.148
      = 23.1 mol/dm³
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Uncrewed vehicles launched into space to collect data are called what?
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Calculate the number of moles when 3.00l of a gas at 814 mmhg and 25 °c?
Mariulka [41]
  • Volume=V=3L
  • Pressure=P=814mmHg
  • Temp=T=25°C

So

No of moles=n

\\ \rm\rightarrowtail PV=nRT

\\ \rm\rightarrowtail n=\dfrac{PV}{RT}

\\ \rm\rightarrowtail n=\dfrac{814(3)}{25R}

\\ \rm\rightarrowtail n=2442/25R

\\ \rm\rightarrowtail n=97.7Rmol

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2 years ago
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