(c) Brass is an alloy which is considered a _______. elements Which of these elements could not form in the sun and would have to be formed in a supernova? I have 470 milligrams of table salt, which is the chemical compound NaCl. (i) The product A2B shows the properties of substances A and B, (ii) The product will always have a fixed composition, (iii) The product so formed cannot be classified as a compound. Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine. e a compound. 2003-2023 Chegg Inc. All rights reserved. chemical means. By physical processes, it can be separated into a simpler substance, 1. b) The solution is usually a liquid, but not always. Nitrogen and helium are examples of elements. c) The cutting knife will not involve any chemical reaction and did not form a new compound hence it is a physical property. Identify the most abundant class of elements. 44. When dilute HCL is added to setup B, Hydrogen gas is evolved, and sulphur does not take part in the reaction. Hence the particles settle down. Like this, iron fillings get separated from the mixture. Solved Which of the following statements regarding elements - Chegg 1. Elements are the fundamental materials of which all matter is composed. An alloy that has 20 parts of gold and 4 parts of silver is known as 24-karat gold. (b) Name a non-metal which exists as a liquid at room temperature. (c) Can you suggest two more solutions which would show the same effect as shown in the milk solution? When cleaning products are not stored properly It can be separated by fractional distillation. 2HCl(aq) + Ca(OH)(aq) 33. Give one example of each type. (c). Ramesh dissolved 10g of sugar in 100g of water while Sarika prepared it by dissolving 10g of sugar in water to make 100g of the solution. They fixed a source of light (a torch) at one end of the box by making a hole in it and making another hole on the other side to view the light. cannot be broken down into a simpler type of matter by either physical or chemical means, and can exist as either atoms (e.g. Lemon juice is a source of citric acid, ascorbic acid and malic acid. If we consider the seawater from the deep sea, it consists of salts, water, mud, decayed plants etc, which will be a heterogeneous mixture. Ammonium chloride is a sublimating substance, and it will evaporate without passing through the liquid phase. Crystallization is a more efficient process as it removes soluble impurities, which cannot be done by evaporation. When elements break down into smaller pieces, thats a nuclear reaction (so called, obviously, because it has to do with the nucleus of the atom). Elements can be two metals or metals with non-metals. (e) Churning of milk cream to get butter. (b)Graphite is used for making electrodes in a dry cell. 41. Colloids are actually heterogeneous in nature though they appear to be homogeneous. Elements cannot be broken down into simpler substances through chemical changes. 18. (d) A mixture of two or more miscible liquids, for which the difference in the boiling points is less than 25 K, can be separated by the process called. The beam of light passing on screen in a theatre. 16. Which of the following statements is true for pure substances? 63. 8. If yes, then describe the procedure. 3. 1. a) Sodium potassium chloride will separate from the saturated solution when the temperature of the solution is reduced from 60C to room temperature. 15. c) Common salt, water and sand are separated by filtration and evaporation processes. The property of water is different from its constituents. (a) Which allows metals to be hammered into thin sheets? Both elements and compounds cannot be broken down into simpler substances. c) Burning of kerosene in a lantern is a chemical change because kerosene burns by using atmospheric oxygen and produces carbon dioxide. (a) Dry ice is kept at room temperature and at one atmospheric pressure. If not, explain. incorrect? 37. The dispersed phase in fog is liquid, whereas, in smoke, it is solid (particulate matter). Which of these cannot be broken down into simpler substances? Compounds B. cannot be broken down into simpler substances by chemical or physical means. Nitrogen and helium are examples of elements. Which of the following substances are elements? :D. b) It is a chemical property because zinc reacts with HCL to give out zinc chloride and hydrogen gas. possible way to describe the Ca(OH)2 - Elements cannot be broken down into simpler substances through chemical changes . Tincture of iodine has antiseptic properties. (iii) Mixture: A mixture is a substance that is made up of two or more particles or substances mixed by physical process. Which cannot be chemically broken down into simpler substances? The vapours of acetone are then condensed to obtain acetone. (e) Two or more coloured constituents soluble in some solvent. Was astronomy discovered by accident or was there a need for it? animal organ system element organism star 4.6 /5 heart 34 Al energy is converted into matter in stars Only matter is conserved within stars. If we consider the seawater on the surface, it comprises water and salts hence it is a homogenous mixture. Two atoms in a heteroatomic molecule may be the same. Suggest some other technique for the same. 45. Other characteristics include lustre, malleability, heat and electrical conductivity. animal organ system element organism Advertisement AI-generated answer Answer 34 people found it helpful amlwho156 Elements cannot be broken down to similar substances. 1. (a) Are the two solutions of the same concentration (b) Compare the mass % of the two solutions. You are given two liquids, one a solution and the other a compound. Give two points of evidence to show that sodium chloride is a compound. A compound B element C mixture D alloy Solution The correct option is B element Crystallisation is a process in which solute particles in a solution collide with the solid solute particles to get separated out of the solution. chemical element, also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. An element cannot be broken down into simpler substances. Matter, elements, and atoms | Chemistry of life (article) - Khan Academy It might also include a mixture of two solids, like in alloys, and a mixture of gases, such as air. During ________ food is broken down into simpler substances. e-solution. (b) Graphite is a non0metal which has the property to conduct electricity and can be used to make electrodes. 1. the smallest particle of an element 3. Pure substances are either elements or compounds. Waste substances that are broken down by microbes are called . Ductility is the property to enable metals to be drawn into wires. b) Acidic and basic solutions can be prepared by dissolving the products of the above process in water, CaO+H2O Ca(OH)2 (basic solution) CO2 + H2OH2 CO3 (acidic solution). Analytical cookies are used to understand how visitors interact with the website. An element cannot be transformed into a new element even by using any physical or chemical means. Because atoms cannot be created or destroyed in a chemical reaction, elements such as phosphorus (P 4) or sulfur (S 8) cannot be broken down into simpler substances by these reactions. (a) and (b) will be more effective as a condenser in the distillation apparatus? cannot be broken down into simpler substances by physical means. Classify the following as elements or compounds: Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea, Elements Iron, Sulphur, Sodium and Carbon. This is the indication of the production of Hydrogen gas. I think elements can be broken down, but their definition says Which of the following statements concerning this reaction are incorrect? A child wanted to separate the mixture of dyes constituting a sample of ink. Compounds are substances composed of two or more elements chemically combined that can be separated into simpler substances only by chemical means. How would you confirm that a colourless liquid given to you is pure water? c-chemical element Chemical elements are those elements which cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. 23. Elements, Compounds & Mixtures - Purdue University (ii) Heterogeneous mixtures: The mixtures in which the constituting substances remain separated and one substance is spread throughout the other substance as small particles, Examples are starch solution and soap solution. Malleability is the property of metals to be hammered into thin sheets. No elements can be broken down into simpler substances. Why could elements not be broken down into simpler units? D. It will shift towards the exothermic reaction. Common salt, water and sand are filtrated to separate the sand from the salt solution. If an unknown substance cannot be broken down into simpler Air shows properties that are the same as the constituent gases present in it. What is a compound and element? When the alignment of the Sun the Moon and the Earth produce a lunar eclipse the body that is between the other two is the? Two chemical species, X and Y, combine together to form a product P which contains both X and Y X + Y P. X and Y cannot be broken down into simpler substances by simple chemical reactions. 8. Another name for an impure substance is Mixture. Subtopics Covered in NCERT Exemplar Class 9 Science Chapter 2 Is Matter around Us Pure. It can be separated by chromatography. b a heterogeneous mixture. The composition of a compound is fixed. b) Salt is a homogenous solution. Separating naphthalene by filtration and then separation of ammonium chloride from water by evaporation. Distilled water is. Because atoms cannot be created or destroyed in a chemical reaction, elements such as phosphorus (P4) or sulfur (S8) cannot be broken down into simpler substances by these reactions. (c)Brass is an alloy which is considered a mixture. A pure substance is made up of the same type of particles or atoms. This column helps to obstruct the upward movement of the vapours of the two liquids. This cookie is set by GDPR Cookie Consent plugin. A compound is a substance formed when two or more chemical elements are chemically bonded together. Explain why a solution of salt in water is considered a mixture and not a compound. (b) can be broken down by hammering it. Why is it useful to classify stars according to their colors surface temperatures and spectral characteristics? Which of the following are chemical changes? What element cannot be broken down? - Answers Which of the following are compounds? Solve complex questions related to the matter around us and score good marks in the annual exam. The periodic table organizes elements by their properties. They are fundamental ingredients of all matte in existence which came be combined in reaction to create a chemical substance. Are elements considered to be substances yes or no? Simple and interactive language is used in the solutions, which makes it interesting for the students while learning. Molecules of certain elements are heteroatomic. Comment. How does studying other planets help us better to understand geological processes on Earth? 5.01: Elements Flashcards | Quizlet f) Oxygen is a non-metal which is required for combustion. Name two elements belonging to each group. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. These cookies will be stored in your browser only with your consent. They are non-lustrous, non-sonorous, non-malleable and are coloured. Heteroatomic molecules maintain the properties of their constituent elements. d) Change in the colour of black tea on adding lemon juice to it is a chemical change. (iii) Suggest one more application of this technique. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". What is the major difference between a solution and an ordinary mixture? A substance which cannot be broken down into simpler substances by chemical reaction is called an ______ . Mercury is a liquid metal, and bromine is a liquid non-metal which exists as liquids at room temperature. Express your feedback with quick comments. occur under which of the following It is provided with glass beads in it. This problem has been solved! Is Matter around Us Pure NCERT Exemplar is very important for your future prospects, as this chapter is a very fundamental chapter that lays a base for your higher studies. It has a fixed proportion of constituents by mass. Dilute hydrochloric acid was added to both Parts and the evolution of gas was seen in both cases. (b) Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas. Because of the Tyndall effect, the milk got illuminated. (b) A drop of ink placed on the surface of water contained in a glass spreads throughout the water. Part A was heated strongly, while Part B was not heated. Justify your choice. Something went wrong. An element is sonorous and highly ductile. nH2O, iron(III), which is different from elemental iron. A substance that cannot be broken down into simpler substances by ordinary chemical or physical techniques is a (n) ____. c) Graphite is an allotropic form of Carbon (non-metal), which is a good conductor of electricity. 41. 38. Oxygen is a non-metal required for combustion. During an experiment, the students were asked to prepare a 10% (Mass/Mass) solution of sugar in water. What are the favourable qualities given to gold when it is alloyed with copper or silver for the purpose of making ornaments? Calculate the mass of sodium sulphate required to prepare its 20% (mass per cent) solution in 100g of water? Cross-conta. See answer (1) Best Answer. Sulphur is an element, water is a compound, and air is a mixture. What are substances that cannot be broken down into simpler substances These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. What are substances that cannot be broken down into simpler - Answers Give two examples each of metal, non-metals and metalloids. The solutions can be referred to while answering the textbook questions to get a clear idea about the concepts which are important from the exam perspective. A moleculeconsists of two or more atoms of the same element, or different elements, that are chemically bound together. Solved 25. Which of the following statements is incorrect - Chegg Since the salt solution did not exhibit the Tyndall effect, light is not illuminated. cannot be broken down into simpler substances. - Doubtnut State two reasons for supposing that brass is a mixture and not a compound. 3. Sodium is a soft metal, and diamond is an extremely hard non-metal which is the allotrope of carbon. (d) Other than carbon which shows allotropy. A foul rotten egg smell of Hydrogen sulphide is the indicator of H2S production. It can be separated by distillation. To get access to the study materials of all the classes and subjects, visit BYJUS website or download BYJUS The Learning App. The concepts discussed in Chapter 2 of NCERT Exemplar Solutions for Class 9 Science are listed below: To prepare well for the annual exams, students should choose the perfect reference guide which helps them to grasp the concepts effortlessly. Diamond is a non-metal, which is extremely hard and a good conductor of electricity. elements and compounds cannot be broken down into simpler substances by an ordinary process A substance that cannot be broken down into a simpler substance is called an __________. All the elements and compounds are pure substances because they contain the same kind of particles. Name the process associated with the following. Doubtnut helps with homework, doubts and solutions to all the questions. The solution of salt in water is considered as a mixture because the salt solution is made up of salt and water, 1. The filter paper was removed when the water moved near the top of the filter paper. c an element. It does not have a fixed ratio, and properties depend upon the nature of its components. When something is broken down chemically, the elements are unchanged. uranium (atomic number 92) Which of the following is not included in John Dalton's modern theory of the atom? 22. Lecture Ch 2. Flashcards | Quizlet Which of the following statements concerning X, Y and P are correct? Chemical elements are those elements which cannot be chemically broken down into simpler substances and are primary constituents of all matter. Which planet is yellow cloudy and super hot? Transport a hot beaker (gntos)________________15. 23. It can be separated by distillation. Substances that cannot be broken down into simpler substances are called ____________. 25. Milk is not a pure substance. A substance that is not as common as pure elements. Doubtnut wants to send you notifications. The basic form of matter that cannot be broken down into simpler substances in chemical reactions is . Name the allotrope. What is meant by saying that metals are sonorous? Mercury is a liquid metal that can be classified as a pure substance and conducts electricity. State one property in which a solution of sugar in water resembles a mixture of sugar and sand, and one property in which it differs from it. Decaying of wood and burning of wood, because there will be a change of chemical composition and wood cannot be restored to its original form. The pH of a solution is 2.0. What elements do the following compounds contain? (ii). The element which is not common between the compounds called baking soda and soda ash is: 61.Is malleable and ductile best describes: 62. Particulate matter present in the milk makes the light scatter, which results in the Tyndall effect. The size of the particles in suspension is relatively larger than the size of the particles in a solution. Why elements Cannot be broken down into simpler substances? Energy and matter are both conserved in stars Energy in stars causes the fusion of light elements. (a)Copper metal is used for making electric wires. Heterogeneous mixture Wood, petrol and water mixture, chalk and water mixture. (ii) Non-metals are elements that are neither malleable nor ductile, and they do not conduct electricity. Compounds can be defined as substances consisting of 2 or more different types of elements in a fixed ratio of their atoms. (e) Name a non-metal other than carbon which shows allotropy. There are considerable differences in the boiling points of acetone (56C) and water (100C). Get solutions for NEET and IIT JEE previous years papers, along with chapter wise NEET MCQ solutions. 19. If the temperature of a reversible reaction in dynamic equilibrium increases, how will the equilibrium change? 68. 21. (b) Classify the following into metals, non-metals and metalloids: Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium. Salt can be recovered from its solution by evaporation. Heating contents in a test tube (estt ubet smalcp)________________9. Then, salt solution is heated to evaporate the water leaving behind salt. (b) Potassium chloride and ammonium chloride, Answers are a) decantation, b) Sublimation, c) Filtration and evaporation, d) decantation and evaporation. Students A and B prepared 150 ml solution, so student c made the desired solution because he added water to make 100 ml solution and from the calculation, Here the 50g NaOH required for 50% w/v 100ml solution of NaOH, 20. A pure substance that has only one kind of atom and cannot be broken into two or more simpler substances by physical or chemical means is an element. cannot be broken down into simpler substances by chemical or physical means. (d) Name a non-metal which is known to form the largest number of compounds. contamination. (e) Mixture of pigments from a flower petal extract. An element is a pure substance. Which of the following is not a mixture? 4. component in the reaction below? Fibres connecting muscles to bone10. E. As the Greeks had thought, This problem has been solved! Upon chemical subdivision, heteroatomic molecules always yield two or more kinds of atoms. We also use third-party cookies that help us analyze and understand how you use this website. (c) Other name for homogeneous mixtures is solutions. A. a) Composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements. (b) A solution is always a liquid. argon) or molecules (e.g., nitrogen). Physical If so, write the chemical equation involved. Place where two bones meet8. Give two points of evidence to show that sugar solution is a mixture. (b) Ice, water and water vapour look different and display different properties, but they are the same. Rusting of iron is corrosion, and its a chemical change because rust is a chemical compound called hydrated iron oxide Fe2O3. Science; Chemistry; Chemistry questions and answers; An element is a substance that can be broken down into simpler substances by physical means. Pure Substances - Examples, Characteristics, Types and FAQ - Vedantu Rusting of an article made up of iron is called, (a) corrosion, and it is a physical as well as chemical change, (b) dissolution, and it is a physical change, (c) corrosion, and it is a chemical change, d) dissolution, and it is a chemical change. e) Sulphur and Phosphorous are the non-metals which show allotropy. (c) Metallic sodium is soft enough to be cut with a knife. The tincture is prepared by using 2-7% elemental iodine and either potassium iodide or sodium dissolved in alcohol. an element can be broken down into simpler substances and compounds cannot be broken down into simpler substances. Hence sample B, which will not boil at 102C, will not freeze at 0C. B) A pure substance that has variable composition throughout A substance composed of two or more elements in fixed, definite proportions. Its constituents are in varied compositions. (f) Name a non-metal which is required for combustion. Elements are the simplest building block of matter. Water, for example, is a compound because pure water is composed of only H2O molecules. Thigh bone, AcrossDown4.The cell which cannot be charge1.Electricity produced by water stored at certain height7.The substance which allows electrical energy passes through it 2.Filament works on this effect of electricity8.The property of conductor which opposes current 3.Positive terminal of a cell9.The path of electric energy flow is called5.Negative teminal of a battery6.MCBs are alternative for. It shows the properties of its constituents. On heating, calcium carbonate gets converted into calcium oxide and carbon dioxide. What is the difference between elements and compounds? Shows the properties as that of its constituents. Here, X and Y cannot be further broken down into simpler substances. 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