Water of crystallisation Study guides, Revision notes & Summaries

Edexcel iGCSE Chemistry, question and answer with rated solution Experiment for Diffusion? 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? 1) Put a coloured substance in a solvent e.g food colouring in water. 2) Over the time, the colour le...

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 ...

OCR Chemistry A-Level - Modules 1-4 UPDATED Exam Questions and CORRECT Answers 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...

A student prepares a solution of calcium nitrate by reacting dilute nitric acid, HNO3, with the base calcium hydroxide, Ca(OH)2. (i) Why is calcium nitrate an example of a salt? ֎ -:- The H+ ion in a nitric acid has been replaced by a metal ion OR by a Ca2+ ion MCl2.2H2O is a salt with water of crystallisation, and M is a metal. the water of crystallisation makes up 22.2% by mass of the hydrated salt. What is the relative formula mass of the anhydrous salt? ֎ -:- 126 Strontium reac...

What is water of crystallisation? water molecules that make up part of the crystal structure of a solid Define relative isotopic mass 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? it is a weighted average mass Define molecular formula the actual number of atoms of each element in a compound Define what an orbital is a region within an atom that can hold up to two electrons of opposi...

Isotopes ֎ -:- Atoms of the same elements with different numbers of neutrons and different masses Why do isotopes of the same element have the same chemical properties? ֎ -:- Same number of electrons, number of neutrons has no effect on reactions of an element Relative isotopic mass ֎ -:- Mass of an isotope relative to 1/12th of the mass of an atom of carbon-12 Relative atomic mass ֎ -:- The weighted mean mass of an atom of an element compared with 1/12th of the mass of an atom ...

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 ...

pure substance - Ans .single element, compound or substance not mixed with another substance physical processes - Ans .mixtures can be separated by... simple distillation - Ans .evaporating water and condensing it in a separate container fractional distillation - Ans .evaporating liquids with different boiling points filtration - Ans .screening and sieving to remove solids chromatography - Ans .using a solvent to separate pigments so you can identify them crystallisation - Ans .ev...

What is an *atom*? - Ans .smallest part of an element ▪ What is an *element*? - Ans .a substance that contains only one type of atom ▪ What are *chemical symbols*? - Ans .- the letter or pair of letters that represents an element. o first letter is always capitalized ▪ What are *compounds*? - Ans .substances in which atoms of two or more elements, which are chemically combined ▪ What is a *chemical formula*? - Ans .a combination of symbols that shows the ratio of elements in a...

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...