Water of crystallisation - Study guides, Revision notes & Summaries

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 op...

AQA Chemistry Paper 1 Complete Solutions (Verified) C1 Atomic Structure - ANSWER What are atoms? - ANSWER Atoms are the particles that make up everything What is an element? - ANSWER An element is a substance in which all the atoms are the same Where are elements shown? - ANSWER Elements are shown in the Periodic table How many elements are there? - ANSWER There are around 118 elements What is a compound? - ANSWER A compound is a substance that c...

State the typical values for the Young's modulus of Mild Steel, Concrete, Timber and Masonry If a beam had a second moment of area (I), and was spanning a distance (L) which material property would directly influence how much it would deflect under a constant load (F)? Youngs Modulus (E) State which materials are not affected by creep and why? Masonry, generally not significant Steel, only at high temperatures State which materials are affected by creep? Timber Concr...

GCSE AQA Chemistry Exam With All Answers what is a compound - ANSWER contains atoms of two or more elements which are chemically combined in fixed proportions how can compounds be separated into their component elements - ANSWER chemical reactions or electrolysis why is the total mass of products equal to the total mass of reactants - ANSWER no atoms are lost or made what is a mixture - ANSWER contains two or more elements or compounds which are not chemically...

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 f...

AQA GCSE CHEMISTRY 8462/1F Paper 1 Foundation Tier Question Paper + Mark scheme [MERGED] June 2022 *JunF01* IB/M/Jun22/E10 8462/1F For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 10 TOTAL Time allowed: 1 hour 45 minutes Materials For this paper you must have: • a ruler • a scientific calculator • the periodic table (enclosed). Instructions • Use black ink or black ball-point pen. • Pencil should only be used for drawing. • Fill in the boxes at ...

what are physical differences that elements or compounds may have solubility mp/bp particle size or mass what is the difference between a miscible liquid and an immiscible liquid -miscible mix well with another to form a homogenous solution immiscible liquids cannot mix to give single phase. eg. water and oil as oil floats on top of water What is decantation? -process to seperate mixtures by removing a liquid layer that is free of a solid or another liquid can be used to seperate mixtu...

AQA Chemistry Paper 2 Correct Answers 2023.c8 - ANSWER rate of reaction - ANSWER The speed at which a chemical reaction happens. reactant - ANSWER The substances that are present before a chemical change takes place. product - ANSWER A substance produced by a chemical reaction collision theory - ANSWER states that atoms, ions, and molecules must collide in order to react. entropy - ANSWER a measure of the degree of disorder in a system pressure - ANSWER a measure of force exer...

A-level Chemistry Definitions 100% Pass isotopes atoms of the same element with different numbers of neutrons atomic (proton) number the number of protons in the nucleus of an atom mass (nucleon) number the number of particles (protons and neutrons) in the nucleus ion a positively or negatively charged atom or (covalently bonded) group of atoms (molecular ion) relative isotopic mass the mass of an atom of an isotope compared with one twelfth of the mass of an atom of carbon-12 relative atom...

Previewed OCR AS Level Chemistry Definitions Isotope - CORRECT ANSWER-Atoms of an element with the same number of protons but different numbers of neutrons. Relative Isotopic Mass - CORRECT ANSWER-The mass of an atom of an isotope of an element relative to 1/12th the mass of an atom of Carbon-12. Relative Atomic Mass - CORRECT ANSWER-The weighted mean mass of an atom of an element relative to 1/12th the mass of an atom of Carbon-12. Relative Molecular Mass - CORRECT ANSWER-The mass of...