The bohr model Guías de estudio, Notas de estudios & Resúmenes
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CLEP Chemistry Latest Update Graded A
- Examen • 25 páginas • 2023
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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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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]
- Examen • 59 páginas • 2024 Popular
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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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EDEXCEL GCSE Combined Science Physics – Paper 1 Foundation Tier Predicted Paper 2023 attached with correct marking scheme
- Examen • 20 páginas • 2023
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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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IB Chemistry Unit 2 SL Latest Version Rated A+
- Examen • 9 páginas • 2024
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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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AQA AS Physical Chemistry 2024 exam questions with 100% correct answers
- Examen • 29 páginas • 2024
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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 |170|questions with complete solution
- Examen • 16 páginas • 2024
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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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TEST BANK FOR RADIOLOGIC SCIENCE FOR TECHNOLOGISTS 11TH EDITION BY BUSHONG
- Examen • 299 páginas • 2022
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MULTIPLE CHOICE 
 
 1. The term “atom” was first used by the ___________. 
a. Ethiopians 
b. British 
c. Greeks 
d. Romans 
 
 
ANS: C 
The term “atom” was first used by the Greeks 
 
DIF: Moderate REF: p. 27 
OBJ: Relate the history of the term “atom.” 
 
 2. The first person to describe an element as being composed of identical atoms was 
__________. 
a. J. J. Thomson 
b. John Dalton 
c. Dmitri Mendeleev 
d. Niels Bohr 
 
 
ANS: B 
The first person to describe an ele...
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AQA AS Physical Chemistry 2024 Exam Questions And Answers
- Examen • 29 páginas • 2024
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AQA AS Physical Chemistry 2024 Exam Questions And Answers 
 
Who described atoms as solid spheres that make up different elements and when? - ANSWER- 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? - ANSWER- John Dalton in 1803 
 
Who discovered the electron and when? - ANSWER- JJ Thomson, 1897 discovered electrons proving atoms weren't indivisible or solid. 
 
New model named pl...
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AQA AS Physical Chemistry 2024 exam questions with 100% correct answers
- Examen • 29 páginas • 2024
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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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OCR 2023 GCSE Combined Science Physics A Gateway Science J250/11: Paper 11 (Higher Tier) Question Paper & Mark Scheme (Merged) COMBINED SCIENCE PHYSICS A
- Examen • 47 páginas • 2024
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OCR 
2023 
GCSE 
Combined Science Physics A Gateway Science 
J250/11: Paper 11 (Higher Tier) 
Question Paper & Mark Scheme (Merged) 
COMBINED SCIENCE PHYSICS 
A 
Please write clearly in black ink. Do not write in the barcodes. 
Centre number Candidate number 
First name(s) 
Last name 
Oxford Cambridge and RSA 
Thursday 25 May 2023 – Morning 
GCSE (9–1) Combined Science A 
(Physics) (Gateway Science) 
J250/11 Paper 11 (Higher Tier) 
Time allowed: 1 hour 10 minutes 
INSTRUCTIONS 
• Use blac...