Alloy a metallic substance madeby comtwo or more metals. Some are common sense but make sure to test yourself afterward as at least 10 marks in every test will go to definitions. Gcse chemistry definitions when learning definitions i find it easier to move around and say them to yourself. The substances in a mixture can be separated using physical methods such. The 91 aqa specification for gcse chemistry, examined from summer 2018. Molecule definition of molecule by the free dictionary. Certain elements are diatomic elements because they do not naturally occur as single atoms, but as a pair of atoms.
Covalent bonds small molecules aqa gcse chemistry single. Or it may contain several types of atom and so be a compound eg ch 4. A key difference is that igcse chemistry does not include practical course work, making it convenient for distance learners. Complete igcse chemistry revision sheets teaching resources. The smallest particle of a substance that retains the chemical and physical properties of the substance and is composed of two or more atoms. Igcse chemistry distance course edexcel igcse oxford. Organic chemistry ii is one of the toughest courses you can take. Ionic compounds do not form molecules, they exist in a giant lattice. Know the difference between ionic and covalent bonds. A molecule is a particle made up of two or more atoms that are chemically bonded together. The oxygen molecule o2 contains two atoms, as do chlorine cl2, hydrogen h2 and nitrogen n2. Glucose is tightly regulated, and both excessive and inadequate. Two pairs of shared electrons form a double covalent bond.
Heres an explanation of what a molecule is and is not with some examples of common molecules. Igcse chemistry book pdf 2nd edition by rosemarie gallagher and paul ingram. A molecule is a single unit created by two or more atoms that are tightly bonded together. Like physics, chemistry is a big subject and youll need more than one book. Molecular formula definition as used in chemistry, chemical engineering, and physics. One pair of shared electrons form a single covalent bond. See more ideas about gcse chemistry, chemistry revision and gcse chemistry revision. At the end of each section there are questions to check what youve learnt plus there are whole sections on how science works and exam skills. The terms molecule, compound, and atom can be confusing. What is the relationship between molecule size and boiling point, viscosity, ease of ignition, and.
Remember, dont rely on remembering them in the order they appear below as this will not be like an exam. Shuffle the questions and make sure the term is first not the definition. The mole is widely used in chemistry as a convenient way to express amounts of reactants and products of chemical reactions. Chemistry gcse dictionary acid a chemical that produces hydrogen ions when it dissolves in water. If the substance forms molecules the formula tells us how many atoms of each element are in the molecule. Chemistry topic 2 oxidation and reduction at gcse you know that oxidation is adding oxygen to an atom or molecule and that reduction is removing oxygen, or that oxidation is removing hydrogen and reduction is adding hydrogen. Quiz questions and answers multiple choice chemistry spm notes download download chemistry form 2 notes download klb chemistry book 3 form 3 chemistry questions and answers form 3 chemistry questions and answers pdf form three chemistry book pdf hard. The longman gcse book was written to cover the chemistry content of all the uk gcse chemistry syllabuses at the time 2002. Atoms and molecules gcse chemistry single science revision. What you need to know for gcse science and additional science for gcse chemistry. You are actually made up of trillions and trillions of different types of molecules. Activation energy the minimum amount of energy required for a given chemical reaction to take place.
This book is full of clear revision notes and detailed diagrams for gcse chemistry students, suitable for the aqa, edexcel, ocr gateway and ocr 21st century exams. If the compound is ionic it is not called a molecule. Science chemistry for kids any time two atoms join together, they make a molecule. Gcse science chemistry 91 covalent bonding 1 youtube. Molecules and covalent bonds cie igcse chemistry revision notes. All the glossary key terms from the aqa chemistry text book. Gcse science chemistry 91 properties of small covalent molecules. Thus, common chemical conventions apply to the definition of the constituent particles of a substance, in other cases. The glucose molecule is an important carbohydrate, essential for the production of atp, or the molecule of energy in the body. Gcse chemistry the best free revision for gcse science. This is a hydrogen atom which has lost an electron in other words, it is a proton. These can make nitric acid and sulfuric acid as well as many others. Three pairs of shared electrons form a triple covalent bond. Written by teachers for the cie igcse chemistry course.
The number of units in a mole also bears the name avogadros number, or avogadros constant, in honor of the italian physicist amedeo avogadro. Molecular formula definition, a chemical formula that indicates the kinds of atoms and the number of each kind in a molecule of a compound. Eg hcl contains one hydrogen and one chlorine c 2 h 5 oh contains two carbons, six hydrogens and one oxygen. These sheets ask questions which when answered summarise the whole of the igcse chemistry course, with one sheet per topic. Everyday low prices and free delivery on eligible orders. Atom economy, percentage yield and gas calculations aqa. During the first year of high school chemistry or the first semester of college chemistry.
Student book with online edition cgp gcse chemistry 91 revision by cgp books isbn. Finish chemistry for cambridge igcse is exceptionally elegantly composed and refreshed book for o level and igcse science syllabus. Glucose is a sugar molecule made up of carbon c, hydrogen h, and oxygen o with a basic chemical formula of. Each definition isclassified according to the field with which it is primarily associated. The qualification supports progression to further study, with uptodate content reflecting the latest thinking in the subject. Total 4 2 a some carbon atoms in the fuel react with oxygen in the air. Diatomic molecules are molecules which are made of two atoms.
Revised glossary for aqa gcse biology for combined. Most of the material for studying complete gcse chemistry and igcse is also included. Edexcel gcse chemistry 1ch0 paper 1 16th may 2019 unofficial markscheme a level chemistry ocr textbook answers edexcel asa level chemistry student book 1 answers answers to chemsheets oxidation states ocr as chemistry breadth mon 20th may unofficial markscheme. The elements and the architecture of everything on. Finish chemistry for cambridge igcse second edition is composed by rosemarie gallagher and paul ingram. Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. The definition of relative molecular mass mr also referred to as molar mass is the mass of a single molecule on a scale on which the mass of an atom of carbon 12 has a mass of 12 atomic mass units. A molecule contains two or more atoms covalently bonded together. Chemistry notes form 3 chemistry form three pdf online. Fsc chemistry book 1, definition of molecules, what is a. Aqa gcse 9 1 chemistry student book by collins issuu. What i loved the most was that the book leaned toward organic chemistry, which is my. It doesnt matter if the atoms are the same or are different from each other.
The international gcse chemistry is of the same level as a gcse and is examined by edexcel, one of the uks most trusted examination boards. It is aimed at students likely to achieve grades from a to b, and written in a way that wouldnt cause problems for students going on to do chemistry at a. All of the definitions are drawn from the mcgrawhill dictionary of scientific and technical terms, sixthedition 2003. Molecule definition is the smallest particle of a substance that retains all the properties of the substance and is composed of one or more atoms. If the substance does not form molecules such as ionic solids, the formula tells us the ratio of each kind of ion. Molecules form when two or more atoms form chemical bonds with each other. General chemistryatoms and molecules wikibooks, open. You may have also learned that oxidation is removing electrons and reduction is adding electrons. Our pearson edexcel international gcse 91 chemistry specification and support materials have been developed with the help of teachers, higher education representatives and subject expert groups.
You will need to use pen and paper to work out the answers to most of the questions. An overview of the definitions of different types of chemicals, how chemicals can be represented in chemical equations, how. Most covalently bonded substances consist of small molecules. A molecule is a group of two or more atoms joined together by covalent bonds. A molecule may contain only one type of atom and so still be an element eg o 2, s 8, p 4 etc. A mixture contains two or more substances that are not chemically combined. Understand the difference between organic and inorganic. Relative molecular mass of a molecule is calculated by adding together the relative atomic masses of the atoms in the chemical formulae. Molecular formula definition of molecular formula at.
Some molecules are huge having a molecular weight in the millions. Edexcel asa level chemistry student book 1 answers. Complete the exam questions end of topic questions in the aqa book or in your revision guide. Transition pack for a level chemistry bullers wood girls. Molecule definition, the smallest physical unit of an element or compound, consisting of one or more like atoms in an element and two or more different atoms in a compound. Core chemistry gcse revision booklet dont forget to add dates to your checklist as you complete each.
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