Neutralisation reaction - Study guides, Class notes & Summaries
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A level chemistry Summary Paper and Study Guide 2024/2025
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▪ Relative atomic mass - Ans .The weighted mean mass of an atom of an element compared 
with one-twelfth of the mass of an atom of carbon-12. 
▪ Relative isotopic mass - Ans .The mass of an atom of an isotope compared with one-twelfth 
of the mass of an atom of carbon-12. 
▪ empirical formula - Ans .The simplest whole number ratio of atoms of each element present 
in a compound 
▪ molecular formula - Ans .A chemical formula that shows the number and kinds of atoms in a 
molecule, but...
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Chemistry- Acids, Bases, and Buffers questions and answers graded A+
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Chemistry- Acids, Bases, and Buffers 
Define Acid - correct answer A proton donor. 
 
Define Base - correct answer A proton acceptor. 
 
Why is H+ a Proton - correct answer Because hydrogen is just one proton and one electron. Take away the electron and you're left with H+. 
 
Define Alkali - correct answer A type of base which dissolves in water to form OH- ions (a soluble base). 
 
What is a Monobasic Acid and Give an Example of One - correct answer A monobasic acid e.g. HCl is an acid which ...
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PAG 3.1 Questions and Answers | Latest Update | 2024/2025 | Already Passed
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PAG 3.1 Questions and Answers | Latest 
Update | 2024/2025 | Already Passed 
 
**How can you determine the enthalpy change when neutralising HCl with NaOH?** 
 To determine the enthalpy change of neutralisation, start by placing a polystyrene cup inside 
a glass beaker. Measure 25 cm3 of 1.0 mol/dm3 hydrochloric acid and 25 cm3 of 1.0 mol/dm3 
sodium hydroxide. Record the initial temperature and take readings every minute for 4 minutes. 
At the 4-minute mark, mix the solutions and continue to me...
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AQA Combined Science - Chemistry Paper 1 - Summary Questions with Complete Answers 2024/2025
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▪ How acidic or alkali something is. - Ans .What does the pH scale tell you? 
▪ one to six - Ans .What's the pH range for acids? 
▪ 7 - Ans .What's the pH of a neutral solution? 
▪ Eight to Fourteen - Ans .What's the pH range of an alkali solution? 
▪ H+ - Ans .Which ion in an aqueous solution causes acidity? 
▪ OH- - Ans .Which ion in an aqueous solution causes alkalinity? 
▪ Base + Acid à Salt + Water - Ans .What does BASW stand for? 
▪ Metal + Acid à Salt + Hydrogen - Ans...
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Edexcel A level Chemistry 2: Exam Questions with Complete Verified Answers 2024/2025
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Ionisation energy trend in Group 2 - Ans .As you go down the group first ionisation energy decreases 
because: 
- Although nuclear charge is increasing 
- The electrons have an extra quantum shell of shielding making them easier to remove 
- They exist in a higher energy orbital (and/ or a further distance from the nucleus) 
Reactivity trend in group 2 - Ans .Group 2 elements become more reactive going down a group as the 
outer two electrons are easier to remove because they have lower first ...
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AQA GCSE COMBINED SCIENCE: SYNERGY 8465/3F Foundation Tier Paper 3 Physical Sciences Version: 1.0 Final G/LM/Jun23/E6 8465/3F (JUN2384653F01) GCSE COMBINED SCIENCE: SYNERGY Foundation Tier Paper 3 Physical SciencesQUESTION PAPER & MARKING SCHEME/ [MERGED]
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GCSE 
COMBINED SCIENCE: SYNERGY 
8465/3F 
Foundation Tier Paper 3 Physical Sciences 
Version: 1.0 Final 
G/LM/Jun23/E6 8465/3F (JUN2384653F01) 
GCSE 
COMBINED SCIENCE: SYNERGY 
Foundation Tier Paper 3 Physical Sciences 
Friday 9 June 2023 Afternoon Time allowed: 1 hour 45 minutes 
Materials 
For this paper you must have: 
l a ruler 
l a protractor 
l a scientific calculator 
l the periodic table (enclosed) 
l the Physics Equations Sheet (enclosed). 
Instructions 
l Use black ink or black ball-po...
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Thermodynamics question and answers 2023/24 update
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Thermodynamics question and answers 2023/24 update Question 1. 
Hesss law is an application of 
(a)	1st law of Thermodynamics 
(b)	2nd law of Thermodynamics 
(c)	Entropy change 
(d)	∆H = ∆U + P∆V. 
Question 2. 
5 mole of an ideal gas expand isothermally and irreversibly from a pressure of 10 atm to 1 atm against a constant external pressure of 1 atm. Wirr at 300 K is: 
(a) -15.921 kJ 
(b) -11.224 kJ 
(c) -110.83 kJ 
(d) None of these 
 
Question 3. 
At absolute zero the entropy of a perf...
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Thermodynamics question and answers 2023/24 update
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Thermodynamics question and answers 2023/24 update Question 1. 
Hesss law is an application of 
(a)	1st law of Thermodynamics 
(b)	2nd law of Thermodynamics 
(c)	Entropy change 
(d)	∆H = ∆U + P∆V. 
Question 2. 
5 mole of an ideal gas expand isothermally and irreversibly from a pressure of 10 atm to 1 atm against a constant external pressure of 1 atm. Wirr at 300 K is: 
(a) -15.921 kJ 
(b) -11.224 kJ 
(c) -110.83 kJ 
(d) None of these 
 
Question 3. 
At absolute zero the entropy of a perf...
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OCR A A Level CHEMISTRY | Questions and Answers with complete solution
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Test for carbonates - - add dilute HCL 
- it makes carbon dioxide 
test for carbon dioxide by bubbling it through lime water 
Test for ammonium ions - -add sodium hydroxide 
-warm the mixture 
-hover damp red litmus paper over it , if it turns blue the ions are present 
Test for sulphate ionz (SO4 2-) - - add dilute HCL 
- then add BaCl2 
- BaSO4 is made which is insoluble in water so a white precipitate will be formed 
Test for Halides (Cl-, Br-, I-) - - add nitric acid 
- add silver nitrate 
-...
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AQA GCSE Chemistry
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AQA GCSE Chemistry 
 
 
 
What is the charge of a proton? - ANS +1 
 
What is the charge of a neutron? - ANS 0 
 
What is the charge of an electron? - ANS -1 
 
What is the relative mass of a proton? - ANS 1 
 
What is the relative mass of a neutron? - ANS 1 
 
What is the relative mass of an electron? - ANS Very small 
 
How many types of atoms do elements contain? - ANS Only one type 
 
What are compounds? - ANS Substances containing two or more different elements that...
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