شرح للكيمياء و أسئلة مراجعة

[moo0oog]

المشاركة الأصلية كتبت بواسطة الأمير المدريدي يعني لوفي الكترون واحد بس غير زوجي والباقي زوجي يكون بارماغنتك

ايوه

[حُمرة الورد..!]

الدرس حق الافلاك الذريه في شابتر ٧

ماني عارفه ايش اذاكر فيه ياليت احد يقولي

[No0o0oN]

درس Bohr theory of the H atom
ماني فاهمته بليز ياليت يادكتورة سحر تشرحيه لي
ومشكورة

[حُمرة الورد..!]

أحد يشرحلي تأثير الحجب في ذرات عديده الالكترونات

وكمان ابى اعرف الحين الطاقه اللازمه لنزع الاكترونات تزيد ولا تقل كل ماعبدنا عن النواه بالنسه للمدار والمجموعه

[حُمرة الورد..!]

وعندي سؤال ثاني في باب الغازات

فيه جزئيه عن تجمع الغاز فوق سطح الماء مو فاهمتها وكيف لماتجي في السؤال كيف اعرف انو ذكزلي ضغط الفاز فوق سطح الماء

أعرف اسئلتي كثيره بس آنتظر جوابك استاذتي

[سحر البيان]

طيب ان شاء الله أرد على كل أسئلتكم ....

بس للأسف عندي ظروف بس أخلص منها .... أرد عليكم

لقيت سيلايدات لجزء من شابتر 7 بالعربي ..... تلاقوها في موضوع

http://www.skaau.com/vb/showthread.php?t=280684&page=42

بالتوفيق

[الأمير المدريدي]

لو سمجتوا ايش طريقة حل هذه الاسئلة في شابتر 7

20

	. The longest wavelength of light that causes electrons to be ejected from the surface of a copper plate is 243 nm. What is the maximum velocity of the electrons ejected when light of wavelength 200. nm shines on a copper plate? A. 1.48 × 106 m/s B. 6.22 × 105 m/s C. 4.67 × 104 m/s D. 1.97 × 104 m/s E. 1.34 × 106 m/s 21. When photons with a wavelength of 310. nm strike a magnesium plate, the maximum velocity of the ejected electrons is 3.45 × 105 m/s. Calculate the binding energy of electrons to the magnesium surface. A. 386 kJ/mol B. 419 kJ/mol C. 32.7 kJ/mol D. 321 kJ/mol E. 353 kJ/mol 65. Which of these atoms is diamagnetic both in its ground state and in all of its excited states? A. Mg B. Ne C. Cu D. Zn E. none of these 66. The electron in a hydrogen atom falls from an excited energy level to the ground state in two steps, causing the emission of photons with wavelengths of 2624 and 97.2 nm. What is the quantum number of the initial excited energy level from which the electron falls? A. 2 B. 3 C. 4 D. 6 E. 8 67. The electron in a hydrogen atom falls from an excited energy level to the ground state in two steps, causing the emission of photons with wavelengths of 1870 and 102.5 nm. What is the quantum number of the initial excited energy level from which the electron falls? A. 2 B. 3 C. 4 D. 6 E. 8 68. When the electron in a hydrogen atom falls from the n = 3 excited energy level to the ground state energy level, a photon with wavelength λ is emitted. An electron having this same wavelength would have a velocity of A. 7.10 × 103 m/s. B. 2.93 × 106 m/s. C. 2.93 × 103 m/s. D. 7.10 m/s. E. 3.00 × 108 m/s. 69. When the electron in a hydrogen atom falls from its first excited energy level to the ground state energy level, a photon with wavelength λ is emitted. A proton having this same wavelength would have a velocity of A. 3.87 m/s. B. 5990 m/s. C. 1.21 × 10-7 m/s. D. 3.26 m/s. E. 5.99 m/s. 70. Breaking the oxygen-oxygen bond in hydrogen peroxide requires 210 kJ/mol. What is the longest wavelength of light that can cause this bond to be broken? A. 5.7 × 10-4 m B. 9.5 × 10-31 m C. 2.8 × 10-7 m D. 9.5 × 10-28 m E. 5.7 × 10-7 m 71. A photovoltaic cell converts light into electrical energy. Suppose a certain photovoltaic cell is only 63.5% efficient, in other words, that 63.5% of the light energy is ultimately recovered. If the energy output of this cell is used to heat water, how many 520 nm photons must be absorbed by the photovoltaic cell in order to heat 10.0 g of water from 20.0°C to 30.0°? [Given: The specific heat of water is 4.184 J/g·°C.] A. 4.12 × 1020 B. 1.72 × 1021 C. 2.62 × 1020 D. 6.95 × 1020 E. 1.10 × 1021

[loool2]

السلام عليكم ,

دكتورتنا العزيزة , سحر البيان ,

لوسمحتي عندي سؤال عاجل جدا ,

لو دكتورتنا تماطل معانا وتتهرب مننا بشكل محد يتخيله أبدا !

وما تخلينا نراجع أوراقنا ونشوف أخطائنا ,

كيف ممكن نشوف أوراقنا ؟ وايش هو التصرف السليم ؟

الله يسعدك دنيا وآخره =)

[الأمير المدريدي]

المشاركة الأصلية كتبت بواسطة الأمير المدريدي لو سمحتوا ايش طريقة حل هذه الاسئلة في شابتر 7 20 . The longest wavelength of light that causes electrons to be ejected from the surface of a copper plate is 243 nm. What is the maximum velocity of the electrons ejected when light of wavelength 200. Nm shines on a copper plate? A. 1.48 × 106 m/s b. 6.22 × 105 m/s c. 4.67 × 104 m/s d. 1.97 × 104 m/s e. 1.34 × 106 m/s 21. When photons with a wavelength of 310. Nm strike a magnesium plate, the maximum velocity of the ejected electrons is 3.45 × 105 m/s. Calculate the binding energy of electrons to the magnesium surface. A. 386 kj/mol b. 419 kj/mol c. 32.7 kj/mol d. 321 kj/mol e. 353 kj/mol 65. Which of these atoms is diamagnetic both in its ground state and in all of its excited states? A. Mg b. Ne c. Cu d. Zn e. None of these 66. The electron in a hydrogen atom falls from an excited energy level to the ground state in two steps, causing the emission of photons with wavelengths of 2624 and 97.2 nm. What is the quantum number of the initial excited energy level from which the electron falls? A. 2 b. 3 c. 4 d. 6 e. 8 67. The electron in a hydrogen atom falls from an excited energy level to the ground state in two steps, causing the emission of photons with wavelengths of 1870 and 102.5 nm. What is the quantum number of the initial excited energy level from which the electron falls? A. 2 b. 3 c. 4 d. 6 e. 8 68. When the electron in a hydrogen atom falls from the n = 3 excited energy level to the ground state energy level, a photon with wavelength λ is emitted. An electron having this same wavelength would have a velocity of a. 7.10 × 103 m/s. B. 2.93 × 106 m/s. C. 2.93 × 103 m/s. D. 7.10 m/s. E. 3.00 × 108 m/s. 69. When the electron in a hydrogen atom falls from its first excited energy level to the ground state energy level, a photon with wavelength λ is emitted. A proton having this same wavelength would have a velocity of a. 3.87 m/s. B. 5990 m/s. C. 1.21 × 10-7 m/s. D. 3.26 m/s. E. 5.99 m/s. 70. Breaking the oxygen-oxygen bond in hydrogen peroxide requires 210 kj/mol. What is the longest wavelength of light that can cause this bond to be broken? A. 5.7 × 10-4 m b. 9.5 × 10-31 m c. 2.8 × 10-7 m d. 9.5 × 10-28 m e. 5.7 × 10-7 m 71. A photovoltaic cell converts light into electrical energy. Suppose a certain photovoltaic cell is only 63.5% efficient, in other words, that 63.5% of the light energy is ultimately recovered. If the energy output of this cell is used to heat water, how many 520 nm photons must be absorbed by the photovoltaic cell in order to heat 10.0 g of water from 20.0°c to 30.0°? [given: The specific heat of water is 4.184 j/g·°c.] a. 4.12 × 1020 b. 1.72 × 1021 c. 2.62 × 1020 d. 6.95 × 1020 e. 1.10 × 1021

	بانتظار الحل

[سحر البيان]

المشاركة الأصلية كتبت بواسطة الأمير المدريدي بانتظار الحل

اليوم ما أوعد

ان شاء الله