Gcse chemistry revision questions elements compounds. Click on each letter to find the words with that initial. Examples include combinations of salt and sand, sugar and water, and blood. A heterogeneous mixture consists of two or more phases. A mixture consists of two or more elements which are chemically joined together a mixture consists of one or more substances that are not chemically joined together. A system of material which comprises of two or more different substances mixed together but are not chemically combined is known as a mixture. It is formed from the remains of plants and animals which died millions of years ago. Smoke is a mixture of particles that are suspended in the air. The system is used to make ice cream and to melt ice and snow.
Elements, mixtures and compounds are the names of types of chemicals. Aqa gcse sciences student book answers separate sciences. Gcse chemistry separating mixtures primrose kitten. Here, a homogeneous mixture is one in which all components are in a single phase, while a heterogeneous mixture contains components in different phases. Imagine mixing skittles and full size marshmallows, the individual components skittles and marshmallows could easily be separated. Enantiomers are stereoisomers that are nonsuperimposable mirror images of each other.
It will be very hard to answer all the questions in the paper without knowing these key terms and definitions. Remember this definition as you might need it in the exam a compound is a completely new material that will often have totally different properties from the elements that made it for example the element sodium is a highly reactive metal. An analytical technique which separates mixtures based on their distribution between a stationary liquid phase and a moving gas phase. While colloidal mixtures are generally considered to be homogeneous mixtures, they often display heterogeneous quality when viewed on the microscopic scale. In chemistry, a mixture forms when two or more substances are combined such that each substance retains its own chemical identity. Common examples of heterogeneous mixtures include dirt, gravel and vegetable soup. In this video we look at the arrangement and the energy of the particles in solids, liquids and gases. In chemistry, when you put one or more things together that arent combined chemically, you start to have a mixture. A mixture is defined as the result of combining two or more substances, such that each maintains its chemical identity. Mixtures there are different ways to separate mixtures, such as filtration, crystallisation, simple distillation, fractional distillation and chromatography.
Components of a solution cannot be separated using simple mechanical filtration. Features of o level chemistry book makes chemistry drawing in, clear and straightforward captivating section openers with alluring. The word pure is used in chemistry in a different way from its everyday meaning. Home igcse study tools chemistry gcse chemistry atoms, elements, compounds and mixtures gcse chemistry atoms, elements, compounds and mixtures i hope you find this useful. Learning objectives i can define the term mixture i can describe different ways to separate mixtures using physical processes. We will learn about centrifugation, distillation, filtration, chrmatography, decantation and. Igcse chemistry book pdf 2nd edition by rosemarie gallagher and paul ingram finish chemistry for cambridge igcse second edition is composed by rosemarie gallagher and paul ingram. Chemistry gcse dictionary acid a chemical that produces hydrogen ions when it dissolves in water. This video is for the new gcse specifications levels 19 for all exam boards. Jan 12, 2019 to a nonchemist, a pure substance is anything composed of a single type of material.
So, learn all of these words and phrases of by heart. Ks4 aqa gcse glossary chemistry t1 atomic structure combined or separate included. Apr 02, 2014 in this video we look at the arrangement and the energy of the particles in solids, liquids and gases. Giant covalent structure a structure with many atoms joined to each other by lots of strong, covalent bonds giving a high melting point and except for graphite poor electrical conductivity.
The difference is that the composition of the substance is always the same. Edexcel international gcse 91 chemistry student book. Chemistry describes the structure and behaviours of different types of substances and in order to do so chemists classify different types of materials according to the particles that form them and how those particles are arranged. The definition of a mixture and how the components of a mixture might be separated using a magnet. Difference between compound and mixture with examples and. Cannot be separated by physical methods of separation.
Pure substances and mixtures separation and purification. Mixture is defined as a physical combination of two or more substances whose identities are retained. Gcse science chemistry 91 simple distillation youtube. Aqa gcse sciences student book answers separate sciences download answers to the practice and summary questions in your aqa gcse sciences 91 biology, chemistry and physics student books. Gcse chemistry definitions when learning definitions i find it easier to move around and say them to yourself.
Learn about and revise mixtures with this bbc bitesize gcse chemistry aqa study guide. Lesson plan and presentation describes how to separate mixtures by filtration, simple distillation, and crystallisation. New aqa gcse 2016 chemistry the properties of polymers. You may have to read through some of the page before you find the answer. Within chemistry, the most common type of homogeneous mixture is a solution which is one substance dissolved completely within. A solid that has dissolved in a liquid is called a solution. Stay tuned with byjus to learn more interesting topics in chemistry. Often it is easy to confuse a homogeneous mixture with a pure substance because they are both. In physical chemistry and materials science, the definition of a heterogeneous mixture is somewhat different.
A pure element or compound contains only one substance, with no other substances mixed in. In chemistry when two or more substances mix with each other it results in the formation of a mixture. The salt water described above is homogeneous because the dissolved salt is evenly distributed throughout the entire salt water sample. Oct 17, 2016 20 videos play all 91 gcse chemistry paper 1 atomic structure and the periodic table freesciencelessons 50 things you can make in minecraft duration. A heterogeneous mixture is a mixture of two or more chemical substances elements or compounds. Glossary for igcse chemistry oxnotes gcse revision. Sep 25, 2016 this video is for the new gcse specifications levels 19 for all exam boards.
Gcse science chemistry 91 elements, compounds and mixtures. At a given temperature, a substance with a higher vapor pressure will vaporize more readily than a substance with a lower vapor pressure. Separating mixtures posters gcse chemistry, chemistry. Edexcel asa level chemistry student book 1 answers answers to chemsheets q mct chemistry 91 gcse equations and formulae why does calcium fluoride have a high melting point. I am also an experienced aqa gcse biology examiner. A mixture is what you get when you combine two substances in such a way that no chemical reaction occurs between the components, and you can separate them again. Some are common sense but make sure to test yourself afterward as at least 10 marks in every test will go to definitions. A pure substance made up of two or more elements chemically combined together. Ks4 aqa gcse glossary chemistry t1 atomic structure. This lesson is designed for the new aqa trilogy chemistry gcse, particularly the earths atmosphere sow. An atom is the smallest part of an element that can exist. This website and its content is subject to our terms and conditions. We then look at how the different states of matter make it possible to separate various. Particles in a solution are not visible to the naked eye.
The substances in a mixture can be separated using physical methods such as filtration, freezing, and distillation. Activation energy the minimum amount of energy required for a given chemical reaction to take place. With science gcse and igcse exams starting in may, most of the syllabus taught and students becoming more dependent on revision, we have drawn together a range of studentled resources to cover all three sciences. Sodium chloride and water form a eutectoid when the mixture is 23. Crude oil is a mixture of a very large number of compounds. In a mixture, each component maintains its own chemical identity. Finish chemistry for cambridge igcse is exceptionally elegantly composed and refreshed book for. Element, compound or mixture edexcel igcse chemistry notes. Water is a homogeneous mixture of nitrogen, oxygen and smaller amounts of other compounds in the gaseous materials. Volatility chemistry in 1 chemistry and physics, volatility is a term used to characterize the tendency of a substance to vaporize. What is a compound a compound is a substance made from two or more elements that have reacted chemically with each other. A mixture contains two or more substances that have not reacted chemically with each other.
A heterogeneous mixture is a type of mixture that allows the components to be seen as two or more phases are present. So, in addition to elements, compounds, and alloys, a pure substance might include honey, even though it consists of many different types of molecules. The separation process is used to transform a mixture of substances into distinct products. A mixture is a combination of two or more pure substances in which the original substances retain their chemical properties. Most of the compounds in crude oil consist of molecules made up of hydrogen and carbon atoms only, we call these type of compounds hydrocarbons. Gcse chemistry atoms, elements, compounds and mixtures. All the sciences have special words that you need to understand. For example sand and water, sugar and salt, air, etc.
An enantiomer has no plane of symmetry and contains a chiral centre. Remember, dont rely on remembering them in the order they appear below as this will not be like an exam. Trilogy specification reference gcse combined science. My resources contain a mix of biology, chemistry and physics lessons aimed at meeting specification points for the new aqa trilogy gcse course and ks3 activate course. In other words, a chemical reaction does not occur between components of a mixture. If the answer you have written is not right, change it to the. Alloy a metallic substance madeby comtwo or more metals.
We look at two physical separation techniques used to separate mixtures. Jul 29, 2019 a mixture is defined as the result of combining two or more substances, such that each maintains its chemical identity. In a mixture, the properties of the components are retained even after they are mixed, as a solution, suspension and colloids. The result formed due to the combination of substances does not lose its individuality nor are they combined chemically. The amount of salt in the salt water can vary from one sample to another. A mixture contains two or more substances that are not chemically combined. A mixture of two miscible liquids is also called a solution the dissolved substance is called the solute. What is a solution a solid or a gas dissolved in a liquid is called a solution. Chemical bonds between the components are neither broken nor formed. Gce o level chemistry matters book by tan yin toon gce o level chemistry matters course book is composed in arrangement with the most recent gce ordinary level chemistry syllabus by the ministry of education, singapore. Definition of mixture when two or more substances are put together, in any ratio such that no chemical reaction takes place, the material comes out, is a mixture. The best way to remember the information in this chapter is to get a pen and paper and write down your answers before clicking on the answer link which will take you to the correct page you may have to read through some of the page before you find the answer.
A mixture contains two or more substances that have. A substance made by mixing other substances together. A mixture is made from different substances that are not chemically joined for example, powdered iron and powdered sulfur mixed together makes a mixture of iron and sulfur. In a homogeneous mixture, on the other hand, any sample that you examine will have exactly the same composition as any other sample. The components in a mixture can be easily separated by physical methods because they are not chemically joined together like in compounds. Mixtures aqa test questions aqa gcse chemistry single. When oil and water are combined, they do not mix evenly, but instead form two.
Sep 11, 2015 in this video we will learn about about six different ways to separate the components of a mixture. The liquid used for dissolving is called the solvent what happens when a solid dissolves. The eutectic point of the mixture of ethanol and water is nearly pure ethanol. Gcse science chemistry 91 filtration and crystallisation. Find out the definition of a chain reaction, what the symbol for helium is, the equation for the speed of light, and more chemistry based. Often it is easy to confuse a homogeneous mixture with a pure substance because they are both uniform. By definition, a pure substance or a homogeneous mixture consists of a single phase. Written by teachers for the edexcel igcse chemistry course.
Chemistry key terms and definitions revision universe. The best way to remember the information in this chapter is to get a pen and paper and write down your answers before clicking on the answer link which will take you to the correct page. Some of the words might have different meanings when you use them in chemistry to when you use them elsewhere. Sep 26, 2016 this video is for the new gcse specifications levels 19 for all exam boards. One page a4 key words taken from the national curriculum a balance of tier keywords for pupils. Impure materials may be mixtures of elements, mixtures of compounds, or mixtures. Blank glossarycompleted glossary i personally find it better to print the blank glossary on a3 and stretch across 2 pages in an exercise book but works well on a4 also. Colloids are uniform mixtures that dont separate or settle out. For example, shops sell cartons labelled as pure orange juice. Independent study for gcse and igcse science classes tes. For example, a packet of sweets may contain a mixture of different coloured sweets. A mixture is made of little bits of each substance mixed together. The definition of chemistry is a branch of science that deals with the form and properties of matter and substances or the interaction between individuals.
Tap water is a mixture of water and other particles. Oxnotes igcse chemistry key chemistry terms glossary. A homogeneous mixture is a mixture in which the composition is uniform throughout the mixture. All material and resources included for a whole lesson.
Student book edexcel international gcse 91 chemistry develop your practical skills with investigative tasks check your progress and understanding using the end of the topic checklists. Mixtures particles and mixtures gcse chemistry single. Remember, understanding is the first step on the road of success. A mixture is a substance in which two or more substances are mixed but not chemically joined together, meaning that a chemical reaction has not taken place mixtures can be easily separated and the substances in the mixture keep their original properties. Detailed revision notes on the topic element, compound or mixture. There is little or no energy change when a mixture forms. Aqa gcse chemistry questions secondary science 4 all. Milk is a mixture of liquid butterfat globules dispersed and suspended in water.
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