Water of crystallisation Study guides, Revision notes & Summaries
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IGCSE Chemistry Written Exam 2024.
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IGCSE Chemistry Written Exam 2024. 
 
 
State the method used to obtain sand from a mixture of sand and water - CORRECT ANSWER filtration 
 
State the method used to obtain solid copper sulfate from aqueous copper sulfate - CORRECT ANSWER crystallisation 
 
State the method used to obtain red food dye from a mixture of food dyes - CORRECT ANSWER paper chromatography 
 
State the method used to obtain water from salt water - CORRECT ANSWER simple distillation 
 
Draw a diagram to show equipment u...
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BMAT PREP CHEMISTRY QUESTIONS AND ANSWERS
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SALTS All solid salts consist of positive and negative ions, and some of them contain water molecules as well. The water in a lattice is called water of crystallisation. 
One mole of a hydrated salt always has a certain number of moles of water of crystallisation shown in the formula. 
For example, hydrated copper sulphate (CuSO4.5H2O) has five moles of water for each mole of the salt. 
 
GROUP 1 Group 1 elements are alkali metals. They are metals that are usually stored under oil or argon to s...
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AS Level Chemistry Complete Guide Question And Answers.
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Atomic number - correct answer Number of protons in an element 
 
Mass number - correct answer Number of protons and neutrons 
 
Ion - correct answer Electrically charged particle formed by the loss/gain of electrons 
 
Relative masses of P,N and E - correct answer 1,1, 1/2000 (respectively) 
 
Isotopes - correct answer Atoms of the same element with different number of neutrons but same number of protons. 
 
What are steps of mass spectroscopy? - correct answer Ionisation, Acceleration, Deflect...
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AQA GCSE Questions & Correct Answers/ Graded A+
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Describe the plum pudding model of the atom 
: A ball of positive charge with randomly embedded negatively charged electrons in it. 
Atom contains electrons, protons and neutrons. Write the three particles in order 
: ron 
n 
on 
Predict outer shells of tennessine 
: Number of outer shells: 7 
Reason: it is in group 7 
Why tennessine was not accepted as a new element by other scientists until 2015 
: Time needed for peer review 
2 
Plan a method to obtain pure dry crystals of zinc chloride from ...
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OCR Chemistry A-Level - Modules 1-4 (A+ GRADED)
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what is water of crystallisation? correct answers water molecules that make up part of the crystal structure of a solid 
 
define relative isotopic mass correct answers the ass of an atom of an isotope of an element relative to one twelfth the mass of an atom of C-12 
 
why is relative atomic mass written as a decimal? correct answers it is a weighted average mass 
 
define molecular formula correct answers the actual number of atoms of each element in a compound 
 
define what an orbital is cor...
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OCR Chemistry A-Level - Modules 1-4 Exam with Guaranteed Accurate Answers
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what is water of crystallisation? - correct answer water molecules that make up part of the crystal structure of a solid 
 
define relative isotopic mass - correct answer the ass of an atom of an isotope of an element relative to one twelfth the mass of an atom of C-12 
 
why is relative atomic mass written as a decimal? - correct answer it is a weighted average mass 
 
define molecular formula - correct answer the actual number of atoms of each element in a compound 
 
define what an orbital is...
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GCSE EDEXCEL TRIPLE SCIENCE CHEMISTRY PAPER 2 2024 QUESTION PAPER WITH QUESTIONS AND CORRCT ANSWERS GRADED A+
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GCSE EDEXCEL TRIPLE SCIENCE CHEMISTRY PAPER 2 2024 QUESTION PAPER WITH QUESTIONS AND CORRCT ANSWERS GRADED A+ 
What is in the nucleus? - CORRECT ANSWER-Protons and neutrons 
What is relative atomic mass? - CORRECT ANSWER-Relative atomic mass is an average mass taking into account the different masses and abundances of all the isotopes that make up the element 
How do you calculate the relative atomic mass? - CORRECT ANSWER-Sum of (isotope abundance x isotope mass number) / sum of abundances of a...
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A LEVEL CHEMISTRY WITH VERIFIED QUESTIONS AND ANSWERS Weak acid - an acid that is only slightly ionised/dissociated in aqueous solution Oxidation - loss of electrons Reduction - gain of electrons Ionic bonding - The electrostatic attraction between op
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A LEVEL CHEMISTRY WITH VERIFIED QUESTIONS AND ANSWERS 
 
Weak acid - an acid that is only slightly ionised/dissociated in aqueous solution 
 
Oxidation - loss of electrons 
 
Reduction - gain of electrons 
 
Ionic bonding - The electrostatic attraction between oppositely charged ions 
 
Covalent bonds - sharing of a pair of electrons 
 
Electronegativity - the ability of an atom to attract the electrons in a covalent bond 
 
Relative atomic mass - The weighted mean mass of an atom of an element ...
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OCR A Level Chemistry - Paper 1 2022 Advanced Info Questions with 100% Correct Answers
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What is Avagadro's constant? Correct Answer 6.02 x 10^23 number of particles in a mol 
 
Define empirical formula Correct Answer The simplest whole number ratio of atoms of each element present in a compound 
 
Define molecular formula Correct Answer The number and type of atoms of each element in a molecule 
 
What is water of crystallisation? Correct Answer Water molecules that are bonded into a crystalline structure of a compound 
 
What is the ideal gas equation? What are the units of each ...
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Edexcel iGCSE Chemistry Study Exam Solution With Advanced Answers.
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Experiment for Diffusion? - correct answer 1) HCl placed at one end of the test tube, ammonia solution at the other. 
2) Where they meet, a ring of Ammonium Chloride appears. 
3) The diagram shows that the ammonia is closer to the ring, showing that ammonia must have travelled faster, showing it's a lighter gas. 
 
Experiment for Dilution? - correct answer 1) Put a coloured substance in a solvent e.g food colouring in water. 
2) Over ...
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