Bohr model - Study guides, Class notes & Summaries
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INF1505 ASSIGNMENT 2 FOR 2024 - Distinction Obtained
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Question 1 Not yet answered Marked out of 1.00 
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Question text Which of the following is recommended in the context of a comprehensive security plan? 
 
a. Participants should receive certificates before training sessions. 
 
b. Management should expect employees to implement their own training. 
 
c. Employees should be trained in security measures. 
 
d. Employee passwords and ID badges should be periodically revoked. 
Clear my choice Question 2 Not yet answered Marked...
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AQA GCSE COMBINED SCIENCE: TRILOGY 8464/C/1F Chemistry Paper 1F Version: 1.0 Final *JUN238464C1F01* IB/M/Jun23/E5 8464/C/1F QUESTION PAPER & MARKING SCHEME/ [MERGED]
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GCSE 
COMBINED SCIENCE: TRILOGY 
8464/C/1F 
Chemistry Paper 1F 
Version: 1.0 Final 
 
*JUN238464C1F01* 
IB/M/Jun23/E5 8464/C/1F 
 For Examiner’s Use 
Question Mark 
1 
2 
3 
4 
5 
6 
7 
TOTAL 
Monday 22 May 2023 Morning Time allowed: 1 hour 15 minutes 
Materials 
For this paper you must have: 
• a ruler 
• a scientific calculator 
• the periodic table (enclosed). 
Instructions 
• Use black ink or black ball-point pen. 
• Pencil should only be used for drawing. 
• Fill in the boxes ...
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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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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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IB Chemistry Unit 2 SL Latest Version Rated A+
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IB Chemistry Unit 2 SL Latest Version 
 
Rated A+ 
 
Emission spectrum An emission spectrum is produced when an atom moves from a higher to 
a lower level. 
 
The line emission spectrum of hydrogen provides evidence for __________________ which 
converge at _____________ The line emission spectrum of hydrogen provides evidence for 
the existence of electrons in discrete energy levels which converge at higher energies. 
 
Continuous spectrum All the colours / wavelengths present merge smoothly in...
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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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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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MTL 200 Exam; Questions and Answers 100% Solved
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MTL 200 Exam; Questions and Answers 100% 
Solved 
Wave Mechanics Correct answer Electron position is based on probability distribution 
Bohr Model Correct answer Electron positon based on discrete paths 
3 Additional Bonding types Correct answer Covalent-ionic, covalent-metallic, metallicionic 
Polymers Correct answer large compound formed from combinations of many monomers 
They are covalent 
Metals Correct answer Elements that are good conductors of electric current and heat. 
They are metal...
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CHM 1045 Unit 1 Exam - Dillon Questions and Answers 100% Solved correctly
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___ are forms of matter - Substances 
____ _____ provides information about percentages of different isotopes of each element - Mass 
spectrometer 
____ + ____ are polar covalent molecules that dissociate into ions when introduced to water - 
Acids, bases 
_____ charge = # of protons > # electrons - positive 
_____ in an experiment are all the factors that the experimenter attempts to keep the same - 
Constant 
______ charge = # protons < # electrons - negative 
"-ate" ending means - mor...
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