C125 - Study guides, Class notes & Summaries
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Edexcel GCSE (9-1) History Medicine through time, c1250-present Student Book
Hilary Stark, Sally Thorne
11 documents
Edexcel GCSE (9-1) History Foundation Medicine Through Time, C1250-present Student Book
Sally Thorne, Hilary Stark, Laura Goodyear
1 documents
New Grade 9-1 GCSE History Edexcel Topic Guide - Medicine in Britain, c1250-present
Cgp Books
1 documents
Hodder GCSE History for Edexcel: Warfare through time, c1250–present
Sarah Webb, Ed Podesta
2 documents
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Pearson Edexcel GCSE (9–1) Thursday 18 May 2023 Morning (Time: 1 hour 15 minutes) History PAPER 1: Thematic study and historic environment Option 12: Warfare and British society, c1250–present and London and the Second World War, 1939–45
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Pearson Edexcel GCSE (9–1) 
 
Thursday 18 May 2023 
 
Morning (Time: 1 hour 15 minutes) 
 
History 
 
 
 
 
 
PAPER 1: Thematic study and historic environment Option 12: Warfare and British society, c1250–present and 
London and the Second World War, 1939–45 
 
QUESTION PAPER AND MARK SCHEME MERGED
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Pearson Edexcel GCSE (9–1) History PAPER 1: Thematic study and historic environment Option 11: Medicine in Britain, c1250–present and The British sector of the Western Front, 1914–18: injuries, treatment and the trenches QP 2023
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Pearson Edexcel GCSE (9–1) History PAPER 1: Thematic study and historic environment Option 11: Medicine in 
Britain, c1250–present and The British sector of the Western Front, 1914–18: injuries, treatment and the trenches 
QP 2023
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CHEM-C125 ASSESSMENT TEST QUESTIONS WITH CORRECT ANSWERS CHEM-C125 ASSESSMENT TEST QUESTIONS WITH CORRECT ANSWERS
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CHEM-C125 ASSESSMENT TEST QUESTIONS WITH CORRECT ANSWERS 
 
A solid sample contains both NaOH and NaCl. 0.500 g of this solid sample was dissolved in water to make a 20.0 mL solution and then this solution was titrated by 0.500 mol/L HCl solution. If 22.5 mL of HCl was used to reach the end point, what is the mass % of NaOH in the original solid sample? 
NaOH + HCl --> NaCl + H2O - Answer- 90 
 
During titration, it is very common to have some NaOH spilled to the inside wall of Erlenmeyer fl...
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C125- EXAM BUNDLE (RATED A+) (GURANTEED PASS)
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C125- ACTUAL EXAM QUESTIONS WITH CORRECT ANSWERS

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C-125 EXAM #2 QUESTIONS WITH COMPLETE SOLUTIONS

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C125 EXAM REVIEW QUESTIONS WITH CORRECT ANSWERS

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C125 EXAM-QUESTIONS WITH CORRECT ANSWERS

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C125 FINAL EXAM QUESTIONS AND ANSWERS

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C125 FINAL
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C125 MIDTERM QUIZ QUESTIONS AND ANSWERS
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C125 MIDTERM QUIZ QUESTIONS AND ANSWERS 
 
 
Predict products of the following reaction: 
 
Cl2 + KI --> - Answer- KCl + I2 
 
What is the reducing agent in the following reaction? 
Cu(s) + 2 AgNO3(aq) --> Cu(NO3)2(aq) + Ag(s) - Answer- Cu 
 
When a colorless Ba(NO3)2 solution mixes with a colorless Na2SO4 solution: - Answer- a precipitate will form 
 
A test tube has a colorless aqueous layer of NaI solution and an colorless organic layer of methylene chloride. When a few mL of colorless ...
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C125 EXAM-QUESTIONS WITH CORRECT ANSWERS
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C125 EXAM-QUESTIONS WITH CORRECT ANSWERS 
 
3.Write a balanced chemical equation noting all species and states of matter 
 
4.Break up any aqueous compound into its ions to write the total ionic equation (including states of matter) 
 
5.Cancel out any spectator ions 
 
6.Write the remaining species as the net ionic equation 
 
Endothermic - Answer- - Absorbs heat from the surroundings 
 
- Becomes colder; requiring a gain of energy 
 
Exothermic - Answer- - Releases energy to it surroundings 
 ...
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C125 STUDY GUIDE EXAM QUESTIONS AND ANSWERS
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C125 STUDY GUIDE EXAM QUESTIONS AND ANSWERS 
 
electron delocalization - Answer- Resonance structures lower the energy through.... 
 
sp3 - Answer- What is the hybridization of the central atom in H2O? 
 
yes - Answer- can both bonding and antibonding molecular orbitals have nodal planes? 
 
perpendicular to internuclear axis - Answer- sigma and pi antibonding molecular orbitals always have a nodal plane where? 
 
2p - Answer- If we apply the HOMO and LUMO concepts in atomic orbitals, we will h...
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CHEM-C125 EXAM #3 QUESTIONS WITH CORRECT ANSWERS
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CHEM-C125 EXAM #3 QUESTIONS WITH CORRECT ANSWERS 
ten-fold difference in concentration of conjugate pairs - Answer- any pH change of 1 unit is a ... 
 
the choice of the system and thus the Ka. 
the ratio of the concentration of conjugate pairs. - Answer- what does the pH of a buffer depend upon? 
 
added strong acid or added strong base - Answer- buffering capacity: 
has the ability to absorb... 
 
need to prepare a buffer solution with a specific pH; assume [base] = [acid] - Answer- how to ch...
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C125 EXAM REVIEW QUESTIONS WITH CORRECT ANSWERS
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C125 EXAM REVIEW QUESTIONS WITH CORRECT ANSWERS 
 
Red and purple are two lines of hydrogen lamp. Which one is correct when comparing these two lines? - Answer- -Red line has smaller energy than the purple one 
-Red line has longer wavelength than the purple one 
 
According to Bohr's Model, which one is correct about a transition from n=2 to n=1 in a hydrogen atom? - Answer- It is a transition from an excited state to a ground state 
 
The lines observed in H-lamp are parts of Balmer Series. ...
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C125 MIDTERM REVISION EXAM QUESTIONS WITH CORRECT ANSWERS
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C125 MIDTERM REVISION EXAM QUESTIONS WITH CORRECT ANSWERS 
 
A student experimentally determined the mass % compisition of Ca in CaCO3 to be 38.9%. What is the real mass % composition of CaCO3? What is the % error? - Answer- real = 40.04% 
error = 2.858% 
 
Recall the procedure (chemical measurements). How would the following source of errors affect calculated density of water? 
 
A balance was improperly calibrated and always weigh masses 1.0g less than the real masses - Answer- no effect (take...
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