Calculate the relative probabilities of finding the electron inside a region of volume 1.0 pm3, located at (a) the nucleus, (b) a distance a o from the nucleus Read more

Atomic sodium produces a yellow glow resulting from the emission of radiation of 590 nm. Calculate the separation of the electronic energy levels responsible for this spectroscopic transition Read more

In a first-order reaction for every 10° rise of temperature, the rate is doubled. If the temperature is increased from 10°C to 100°C, the rate of the reaction will become * 1. 512 times • 2. 64 times • 3. 256 times • 4. 128 times Read more

* THE PHOTOELECTRIC EFFECT AND ELECTRON DIFFRACTION ARE PHENOMENA THAT CONFIRM WAVE-PARTICLE DUALITY. WHAT IS MEANT BY WAVE-PARTICULAR DUALITY? * the wave character of matter and radiation * the particle character of matter and radiation * the joint particle and wave character of radiation * the joint particle and wave character of matter and radiation Read more

CHOOSE THE CORRECT ANSWER * IN CLASSICAL PHYSICS, RADIATION IS DESCRIBED IN TERMS OF AN: * oscillating electric field disturbance that travels through vacuum at a constant speed * oscillating electromagnetic disturbance that travels through vacuum at a constant speed * oscillating magnetic field disturbance that travels through vacuum at a constant speed * None of the above Read more

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WHICH NAME-FORMULA COMBINATION IS NOT CORRECT?ما هى الصيغة والاسم الغير صحيحين فيما يلى - (a) [Co(NH3)4(OH2)I]SO4 tetraammineaquaiodocobalt(III) sulfate (b) K[Cr(NH3)2Cl4] potassium diamminetetrachlorochromate(III) c) [Mn(CN)5]2- pentacyanomanganate(II) ion (d) [Ni(CO)4] tetracarbonylnickel(0) e) Ca[PtCl4] calcium tetrachloroplatinate(II) Read more

1- On the gravimetric determination of Ca2+ ! the most satisfactory form (being nonhygroscopicl to be weighed is: A. CaCO3 B. CaO C. CaC2O4.H2O D. CaC2O4 2. The following is not a form of "co-precipitation": A. Occlusion. B. Inclusion. C. Post precipitation. D. Surface adsorption. 3- For optimal precipitation process, requirements are: A. High "relative super saturation". B. High rate ... Read more

- Complete the following 1- The most suitable pH in Mohr's method is------------------------- 2- AgCl is soluble in------------------- and ------------------ 3- Ksp of Bi2S3 equals---------------------------------------- 4- For determination of mixture of NaCl and NaCN a combination of---------------- and -------------------- methods is used. Read more