What is crystallisation - Study guides, Class notes & Summaries
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OCR Chemistry A-Level - Modules 1-4 | Questions and Answers with complete solution
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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...
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GCSE AQA Chemistry Exam With All Answers
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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...
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Edexcel iGCSE Chemistry Actual Exam With Well Elaborated Answers Graded A+.
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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 f...
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AQA Chemistry Paper 1 Complete Solutions (Verified)
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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...
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AQA GCSE Chemistry Paper 1. Foundations Chemistry. Exam Questions with Merged Answers 2024/2025
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1. What is a mixture? - Ans .Two or more elements not chemically bonded 
2. What is the difference between a compound and a mixture? - Ans .Compounds have a fixed 
composition whereas mixtures do not. Mixtures are not chemically bonded but compounds are. 
3. Describe the process of filtration - Ans .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 
4. Describe the pr...
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OCR Chemistry A-Level - Modules 1-4 Revision Questions with Complete Detailed Solutions For New Updates
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1. what is water of crystallisation? - Ans .water molecules that make up part of the crystal 
structure of a solid 
2. define relative isotopic mass - Ans .the ass of an atom of an isotope of an element relative to 
one twelfth the mass of an atom of C-12 
3. why is relative atomic mass written as a decimal? - Ans .it is a weighted average mass 
4. define molecular formula - Ans .the actual number of atoms of each element in a compound 
5. define what an orbital is - Ans .a region within an at...
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2024 AQA Foundation Chemistry Paper 1 Revision Questions with Complete Solutions
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▪ What are all substances made of - Ans .atoms. 
▪ What is an atom? - Ans .Smallest part of an element that can exist. 
▪ What is an element? - Ans .A substance that only contains one type of atom. 
▪ How many elements are there? - Ans .about 100. 
▪ Where are elements displayed? - Ans .In the periodic table. 
▪ How are the atoms of each element represented? - Ans .different chemical symbols. 
▪ What are most substances? - Ans .Compounds. 
▪ What is a compound? - Ans .2 or more e...
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OCR Chemistry A-Level - Modules 1-4 A+ Graded (100% guarantee)Full Copy.
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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 fo...
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AQA GCSE Chemistry Paper 1 2023 Exam Questions With Complete Solutions
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AQA GCSE Chemistry Paper 1 2023 Exam Questions With Complete Solutions 
What is an atom? - ANSWER Smallest part of an element that can exist 
 
What is an element? - ANSWER A substance made up of one type of atom 
 
How are elements represented? - ANSWER Using symbols, in the periodic table 
 
Approximately how many elements are there? - ANSWER 100 
 
What is a compound? - ANSWER A substance made up of two or more elements chemically c...
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Practical Considerations Steel, Concrete, Timber, Masonry, & FRP (Part 2) exam questions and answers
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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...
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