Rutherford bohr - Study guides, Class notes & Summaries
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CLEP Chemistry Latest Update Graded A
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CLEP Chemistry Latest Update Graded A John Dalton Proposed that matter is composed of atoms; these atoms have different identities called elements, which combine to form compounds; measured masses of reactants and products. 
J.J. Thompson Observed deflection of particles in a cathode ray tube; proposed that atoms are composed of positive and negative charges; developed the plum pudding model of the atom 
Robert Millikan Calculated the charge-to-mass ratio of electrons using oil drops falling in ...
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EDEXCEL GCSE Combined Science Physics – Paper 1 Foundation Tier Predicted Paper 2023 attached with correct marking scheme
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GCSE Combined Science Edexcel 
Physics – Paper 1 Foundation Tier Predicted Paper 2023 attached with correct marking scheme 
	 
Name …………………………………………………………………… 
Date ………………… 
 
 
1 hour 15 minutes allowed. 
You may use a calculator and an Edexcel equation sheet. 
 
 
 
 
Grade boundaries 
These are VERY rough guesses! Getting a 4 on this paper does not guarantee you the same mark in the exam. 
 
 
 
•	5-5	60% 
•	4-4	50% 
•	...
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Honors Chemistry Scientists Latest Update Graded A+
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Honors Chemistry Scientists Latest 
 
Update Graded A+ 
 
Who is known for the discovery of the electron and his work with the cathode ray tube? 
 J.J. Thomson 
 
Who developed the periodic table and organized elements by their atomic mass? 
 Dmitri Mendeleev 
 
Who is credited with the creation of the first model of the atom with a positively charged nucleus 
surrounded by electrons? 
 Ernest Rutherford 
 
Who proposed the quantum mechanical model of the atom and introduced the concept of 
orbi...
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DAT General Chemistry Latest Update Graded A+
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DAT General Chemistry Latest Update Graded A+ Atomic Number number of protons found in that atom; low number; (Z) 
Mass Number Protons + Neutrons; high number; (A) 
Atomic Mass relative mass of that atom compared to the mass of a carbon-12 atom (which is set at 12.00); measured in amu; 
1 amu = 1.66x10^-24 
Atomic Weight weight (g) of one mole (mol) of a given element (g/mol); the weighted average of all the masses (not the weights) of an element, weighted according to the natural abundance of t...
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LRA 211 Certification Exam Questions and CORRECT Answers
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Joseph (JJ) Thomson - Developed "plum pudding model" 
Interactions in x-ray tube - Happen at atomic level 
Ernest Rutherford - Model resembling tiny solar system 
Niels Bohr - Atoms have 3 particles Protons, Neutrons, and electrons 
binding energy - Energy needed to split up and atom 
Electron binding energy depends on - How close the electron is to the nucleus and how 
many protons are in the atom
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AQA AS Physical Chemistry 2024 exam questions with 100% correct answers
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AQA AS Physical Chemistry 2024 exam 
questions with 100% correct answers 
Who described atoms as solid spheres that make up different elements and when? - 
ANSWERS John Dalton in the 19th century 
Who suggested that atoms of a particular element had the same mass and atoms of 
different elements had different masses and when? - ANSWERS John Dalton in 1803 
Who discovered the electron and when? - ANSWERS JJ Thomson, 1897 discovered 
electrons proving atoms weren't indivisible or solid. 
New m...
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DAT General Chemistry Exam Questions Correctly Answered.
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DAT General Chemistry Exam Questions Correctly Answered. 
 
 
Atomic Number - CORRECT ANSWER number of protons found in that atom; low number; (Z) 
 
Mass Number - CORRECT ANSWER Protons + Neutrons; high number; (A) 
 
Atomic Mass - CORRECT ANSWER relative mass of that atom compared to the mass of a carbon-12 atom (which is set at 12.00); measured in amu; 
 
1 amu = - CORRECT ANSWER 1.66x10^-24 
 
Atomic Weight - CORRECT ANSWER weight (g) of one mole (mol) of a given element (g/mol); the weighte...
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DAT General Chemistry Exam |170|questions with complete solution
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DAT General Chemistry Exam |170|questions with complete solution 
Atomic Number ANS-number of protons found in that atom; low number; (Z) 
 
Mass Number ANS-Protons + Neutrons; high number; (A) 
 
Atomic Mass ANS-relative mass of that atom compared to the mass of a carbon-12 atom (which is set at 12.00); measured in amu; 
 
1 amu = ANS-1.66x10^-24 
 
Atomic Weight ANS-weight (g) of one mole (mol) of a given element (g/mol); the weighted average of all the masses (not the weights) of an element, ...
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GCSE EDEXCEL TRIPLE SCIENCE CHEMISTRY PAPER 2 2024/2025 QUESTION PAPER ALREADY PASSED
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GCSE EDEXCEL TRIPLE SCIENCE CHEMISTRY 
PAPER 2 2024/2025 QUESTION PAPER ALREADY 
PASSED 
What does 'aq' mean? - answer Aqueous - it is dissolved in water 
Water - formula - answer H20 
Ammonia - formula - answer NH3 
Carbon Dioxide - formula - answer CO2 
Hydrogen - formula - answer H2 
Chlorine - formula - answer Cl2 
Oxygen - formula - answer O2 
Ammonium (ion) - formula - answer NH4 (+) 
Hydroxide (ion) - formula - answer OH (-) 
Nitrate (ion) - formula - answer NO3 (-) 
Carbonate (ion) -...
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Chemistry Praxis Review Questions and Answers
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Schrodinger (1925) Continued upon Bohr's findings to determine where electrons are typically found. 
 
Heisenberg (1927) Created the heisenberg uncertainty principle because you never can predict where the electron is. (Breaking Bad) 
 
De Broglie (1924) Electrons act like waves around the atom. 
 
Niels Bohr (Bohrbit) (1913) Electrons can orbit the nucleus in certain special orbits at different energy levels around the nucleus. 
 
Earnest Rutherford (foil) (1910) Fired beam of alpha particles ...
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