compounds . Difficulty. It is wise to plan your answer rather than rushing straight into it, otherwise you may stray away from the key points. The constituents of a mixture do not retain their original properties. Example: Uranium is a radioactive element. Explain these results by referring to the structures of the substances. Describe how the arrangement of elements in the periodic table is related to the atomic structure of their atoms. Formats: Info Page: Quiz: ... mixtures . Food colourings contain a mixture of water soluble dyes. These require longer answers than the structured questions with fewer marks. False : 7. ... 5 Question Bank (iii) Radioactive elements : Those elements which give harmful radiations are called radioactive elements. You do not usually need to include all of them to gain six marks, but you do need to write in full sentences, linking them logically and clearly. Six-mark questions are extended open response questions. Questions Settings. Feedback. Explain how this method works. Which statement about atoms and molecules is correct? <= => An Irish scientist who is now considered the father of chemistry proposed the first modern definition of an element. Approximately how many elements are there? These require longer answers than the structured questions with fewer marks. The following are valid points that could be included in your answer. Elements always exist as pairs of atoms called molecules, Elements and compounds can exist as molecules. Chemical symbols and formulae are used to represent elements and compounds. 7. It gives information about these substances. <= => An Irish scientist who is now considered the father of chemistry proposed the first modern definition of an element. Start studying Elements, Compounds, Mixtures. An element is a pure substance which cannot be broken down by physical or chemical methods. Complete the statements given below by filling in the blank with the correct word/s. Look at the table. Chemical symbols and formulae are used to represent elements and compounds. Elements can be divided into metals and non-metals. To gain full marks, you need to: You are likely to see command words such as: Six-mark questions may be synoptic questions. Understanding how to approach exam questions helps to boost exam performance. The basic unit of an element is an atom. This topic is school chemistry, pre GCSE. Try this as often as you like. Read about our approach to external linking. This scientist was Edexcel IGCSE Chemistry exam revision with questions and model answers for Elements, Compounds & Mixtures 2 (1C). Learn vocabulary, terms, and more with flashcards, games, and other study tools. A mixture of water and oil is _____ in nature. There are over 100 different elements, which are made up of atoms. Formats: Info Page: Quiz: ... mixtures . OCR Gateway Science, GCE Chemistry, Paper J248, 2016 - Higher. Play this game to review Chemical Bonds. The basic unit of matter is Play as. Mixtures – tap water, milk, air, gold ornaments, ice-cream, brass, salt solution, steel, wood. How many atoms are there in total in a molecule of sulfur trioxide, SO3? compounds . Elements, Compounds and Mixtures Multiple Choice Quiz. Devise a method to separate the dyes in a sample of food colouring. Class-6 Dalal Elements Compounds and Mixtures ICSE Chemistry New Simplified Solutions Chapter-2. Remember that the topics covered in the first paper are assumed knowledge for the second paper, so questions in the second paper may need knowledge and understanding of those topics too. You will get a different set of questions each time you attempt this quiz. Start. Quiz Flashcard. Read about our approach to external linking. Objective Type Questions. Elements, compounds and mixtures - Six-mark questions, maintain a sustained line of reasoning, rather than getting lost or bogged down, - you need to give an account but no reason, - you must plan or invent a procedure using your scientific knowledge and understanding, - you must review information, including identifying strengths and weaknesses, and make a supported conclusion, A student is separating a mixture of three solid substances (, Suggest how the student can separate the mixture to get pure, dry samples of substances, OCR Gateway Science, GCE Chemistry, Paper J248, 2016, A sticks to a magnet/B and C do not stick to a magnet, B passes through filter paper in solution, melting point of B/C is higher than the boiling point of water, in the periodic table the elements are arranged in order of increasing atomic number/proton number, the atomic number of the elements increases steadily across a period, elements in the same period have the same number of electron shells, elements in the same group have similar chemical properties, atoms of elements in the same group have the same number of outer electrons, the number of outer electrons is equal to the group number, the number of occupied electron shells increases down a group, draw a horizontal line in pencil near the bottom of a piece of chromatography paper, place the paper in a container with some water/solvent, allow the water/solvent to travel through the paper, remove the paper before the water/solvent reaches the top of the paper, and allow it to dry, the spots on the paper will indicate the number and type of dyes present, paper chromatography uses a mobile phase (the solvent/water), and a stationary phase (contained on the paper), forces of attraction between the dyes and these phases cause the dyes to move at different rate over the paper, depends on solubility of the dyes in mobile and static phase, OCR Gateway Science, GCE Chemistry, Paper J248, 2016 - Higher, sodium chloride contains ions in a regular lattice, there are electrostatic forces of attraction between oppositely charged ions, a lot of energy is needed to overcome/break these forces/bonds, there are weak intermolecular forces between molecules, less energy needed to overcome these forces, diamond exists as a giant covalent structure, a very large amount of energy is needed to break bonds, Purity and separating mixtures - OCR Gateway, Home Economics: Food and Nutrition (CCEA). How many atoms are there in total in a molecule of sulfur trioxide, SO. elements ... heterogeneous : 6. False : 7. Which of these contains four hydrogen atoms? Mixtures, Elements & Compounds Quiz! Sign in, choose your GCSE subjects and see content that's tailored for you. Our tips from experts and exam survivors will help you through. Question types will include multiple choice, structured, mathematical and practical questions.

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