15. (j), IV. The general equation for this process can be represented as Metal + Acid → Metal salt + Hydrogen gas However, all metals will not react with acids. (a) metals Why does calcium float in water? (c) calcium The equa­tion of the re­ac­tion is: 2Al + 6HCl = 2Al­Cl₃ + 3H₂ (a) Sulphur Question 23. 4. Hence, the slightest change in temperature is potable when it is used in a thermometer. False C3 Chemical reactions. Perform the experiment and prepare a short report on the results. (a) Gold Zn + H 2 SO 4 ⇨ ZnSO 4 + H 2. The process is explained here for your help. Match the items given in column I suitably with those given in column II. Magnesium forms _____ oxides. The rests you should try to do yourself. bronsted-lowry acids vs. bases. (d) carbon, Question 10. Imagine that gold is reactive like copper. 1)Magnesium metal react with dilute hydrochloric acid to form magnesium chloride and hydrogen gas. In a re­ac­tion with hy­drochlo­ric acid, re­lease of hy­dro­gen is ob­served. Add 5 cm 3 of dilute sulfuric acid and note the rate of production of gas bubbles. Answer: Answer: However, there’s still an ongoing debate as to whether carborane is the strongest of them all. Zinc sulphate forms a colourless solution in water. 6. acidic Oxidising/ reducing. Thus, the list shows 14 metals that will displace hydrogen from acids. Answer: Answer: CopperCopper, gold and silver are known as noble metals. Non-ipetals 3. Answer: Ask any chemistry question and an expert will answer it in as little as 30 minutes. Answer: 20. In displacement reactions Sodium, potassium 5. Take an electric tester and test the conductivity of the given metals separately with the wires of same length and thickness. When a copper vessel is exposed to moist air for long, it acquires a dull green coating. (d) generally solid and gasses, Question 7. strong acid + weak base, e.g., HCl + NH 3 → NH 4 Cl The reaction between a strong acid and a weak base also produces a salt, but water is not usually formed because weak bases tend not to be hydroxides. 8. Ductility is one of the properties of metals due to which they can be drawn into wires. Metal compound A reacts with dilute hydrochloric acid to produce effervescence. When dilute acids and metals are mixed you will get Hydrogen gas and salts. (c) non-malleable (b) non-oxidizing acids such as dilute hydrochloric acid or dilute sulfuric acid (in which hydrogen is displaced from acid to produce hydrogen gas). (a) Graphite video from: Noel Pauller manganese dioxide when reacts with hydrochloric acid forms manganese chloride water and chlorine a express the above reaction in the form of a balance - Chemistry - TopperLearning.com | j5rbeoh77 Some metals will react with oxygen when they burn. The tablet is not made of iron metal, instead it contains a salt of iron. Suggest an activity to arrange sodium, magnesium and copper in the order of their decreasing reactivity. He is passionate about technology and its practical application in today's world. The pure metal is second only to silver in thermal and electric conductivity. False (a) Which is the hardest substance? 5. Whose oxides are basic in nature: Metal or non-metal? Aluminium is a metal and hence possesses malleability property. Non-metal like iodine is used in the purple coloured solution applied on wounds. 2. Question 5. Question 1. Generally, metallic oxides are basic and non-metallic oxides are acidic in nature. In acidic water, the negative fatty acid ions become fatty acids. Answer: In which form are the deposits found? 9. Finally prepare a short report based on your findings. (a) (d) all of these, Question 2. Question 5. Metal oxides are Question 6. Copper, iron, graphite, sulphur, aluminium, oxygen Mark these in an outline map of India. (c) sonorous Name some common non-metals. or Non-metals do not react with water. Mercury does not react with most acids, such as dilute sulfuric acid, although oxidizing acids such as concentrated sulfuric acid and nitric acid or aqua regia dissolve it to give sulfate, nitrate, and chloride salts. Metals are very useful to us in many ways. (a) hydrogen gas You, can do it yourself for more knowledge about metals and non-metals. (h) > Here is a picture of the activity series. Example: Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. Acids and bases react chemically with each other to form salts. Question 4. Make sure they are in contact with the zinc. Answer: Answer: The hydrogen gas formed on adding calcium to water sticks to the surface of calcium solid and make it float in water. However, some metals like aluminium, lead and zinc react with strong bases like sodium hydroxide (NaOH) to make complex salts and hydrogen. 15. Chlorine is not a non-metal. We must handle the equipments carefully and firmly. 13. 11. C3.3 Types of chemical reactions. Classify the following into metals and non-metals: Metals: Copper, iron, aluminium There is a diagonal relationship between lithium and magnesium. Following is the general equation for such metals. True (a) Sodium Name the metal and non-metal which occur in liquid state. Substances having characteristic properties like malleability, ductility, sonority, conductivity, lustre, – and solidness are called metals. (a) bromine What are the differences between metals and non-metals? To access more topics go to the Combined Science Notes page. (b) non-oxidizing acids such as dilute hydrochloric acid or dilute sulfuric acid (in which hydrogen is displaced from acid to produce hydrogen gas). The gas evolved extinguishes a burning candle. (c) Digital thermometer and spirit thermometer. Answer: True Sonority, Question 11. Because of being more reactive than the metals which they displace. True Lustre, Question 5. (c) both metals and non-metals (d) all of these, Question 3. (d) Answer: Name the property due to which metals can be drawn into wires. NCERT Solutions for Class 8 Science Chapter 4 – 5 Mark Questions and Answers. Mineral Acids . 8. The activity series is a useful guide for predicting the products of metal displacement reactions. For example, _____ reacts with cold water vigorously. Question 16. (c), II. Substances which are soft and dull, i.e., non-lustrous, non-sonorous, non-ductile, non-malleable and poor conductor of heat and electricity are called non-metals. Which non-metal does conduct heat and electricity? (c) Some shopkeeper’s are greedy, mean, cheater and money minder. How are metals useful to us? 4. Answer: The video shows an experiment to determine the placement of three different metals (Cu, Zn and Mg) on the activity series. Question 14. There are various ways in which acids react with different metal compounds. (b) Silicon This is the MPD file used: ... Can nitrous dioxide develop when copper and dilute nitric acid react? (a) Nitrogen Non-metals cannot be converted into wires. (a) react with water Name one non-metal which is lustrous. (iv) Reaction with bases: Most of the metals do not react with bases. 14. Name two metals which are soft enough to be cut. metals have 1,2,3 (or so) valence electrons in their outer shells. Name the gas evolved when sodium hydrogen carbonate is made to react with dilute hydrochloric acid. True All metals are hard except _____ and _____. 10. But most of the non-metals reacts with oxygen on ignition. Sodium, III. Give examples of metalloids. Basic solution turns red litmus into blue. Less reactive metal (Cu,Au,Ag) do not displace hydrogen from dilute acid. (i) This equation is written as: Zn + H 2 SO 4 ZnSO 4 + H 2 (b) A balanced chemical equation has an equal number of atoms of different elements in the reactants and products. Question 6. For example, aluminium and copper are drawn into wires and used for electrical and different purposes. But most of them do this on ignition. Explain the term ‘malleability’ with suitable examples. non-metals have 4, 5,6,7 valence electrons and want to add them. Some metals like potassium and sodium react vigorously with oxygen. Question 13. The equation are as follows: Answer: The metal found in liquid state is ... Metals do not react with hydrogen but non-metals react with hydrogen to form hydrides. The acid and base neutralize each other, so the solution will be neutral (pH=7) and the ions that are formed will not react with the water. Some metals like gold, copper, silver, etc., do not liberate hydrogen gas with acids. or (b) Mercury is a good conductor of heat. (a) silver 6. Answer: A colourless solution of NaOH is formed. Like silver, mercury reacts with atmospheric hydrogen sulfide. Metals react with acids to form respective salts along with evolution of hydrogen gas that burns with a pop sound. What is reactivity series? Two interpretations of implication in categorical logic? 10. 11. _____ is less reactive than iron. Carbon, a non-metal, is used in most of the fuels. Malleability is the property of metals due to which they can be beaten into thin sheets. Answer: You can do this yourself with the help of electric tester. e.g. Acids and Bases React with Metals. chemistry.about.com/library/weekly/bl050303a.htm, chemistry.about.com/od/testsquizzes/Chemistry_Tests_Quizzes.htm, www.corrosionsource.com/handbook/periodic/metals.htm. Only to those metals which react with (dilute) H 2 SO 4 forming an isoluble layer (sulphate, oxide, ecc). Free Online CBSE Class Notes, NCERT Solutions, Self Study material for Class 6, Class 7, Class 8, Class 9, Class 10, Class 11 and Class 12 What happens when dilute sulphuric acid is poured on a copper plate? Pure gold is very soft and is thus not suitable for making jewellery. But unlike the reaction between acids and bases, we do not get water. Due to its bleaching properties it is used to make bleaching powder. Question 4. (d) (c) Phosphorus Reaction of zinc with dilute sulphuric acid: Zinc sulphate and hydrogen gas are formed when zinc reacts with dilute sulphuric acid. (b) 4. Fill in the Blanks Barium sulphate does not dissolve in hydrochloric acid. Usually, bases taste bitter. (d) None of these, Question 12. 15. Question 2. Metals are _____ of heat and _____. (c) Potassium What are non-metals? In general an acid reacts with a metal to produce a salt and hydrogen gas. 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