What is crystallisation - Study guides, Class notes & Summaries

AQA GCSE Chemistry Paper 1 Questions And Answers Rated A+. What is an *atom*? - correct answer. smallest part of an element What is an *element*? - correct answer. a substance that contains only one type of atom What are *chemical symbols*? - correct answer. - the letter or pair of letters that represents an element. - first letter is always capitalized What are *compounds*? - correct answer. substances in which atoms of two or more elements, which are chemically...

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 ֎ -:- The H+ ion in a nitric acid has been replaced by a metal ion OR by a Ca2+ ion MCl2.2H2O is a salt with water of crystallisation, and M is a metal.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...

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...

What is a mixture? - CORRECT ANSWER-Two or more elements not chemically bonded What is the difference between a compound and a mixture? - CORRECT ANSWER-Compounds have a fixed composition whereas mixtures do not. Mixtures are not chemically bonded but compounds are. Describe the process of filtration - CORRECT ANSWER-Pour the mixture onto the filter paper, the liquid simply passes through the filter paper into the flask. The insoluble solid cannot pass through and so it stays on the paper...

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...

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...

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...

What is an atom? - Ans .Smallest part of an element that can exist ▪ What is an element? - Ans .A substance made up of one type of atom ▪ How are elements represented? - Ans .Using symbols, in the periodic table ▪ Approximately how many elements are there? - Ans .100 ▪ What is a compound? - Ans .A substance made up of two or more elements chemically combined in fixed proportions ▪ How are the elements in a compound separated? - Ans .By chemical reaction ▪ How are chemical rea...

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...

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? - Ans .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? - Ans .126 Strontium react...