Reactions 6 a Look at the statements below. Tick the ones that show a chemical reaction is taking place. square New substances are made. square You can get back what you started with. square You notice a sweet smell being produced. square The substance dissolves when being stirred into water. square Bubbles appear in the substance. (3 marks) Look at the picture of the student carrying out the experiment Identify one safety precaution she is following. c When using liquids they may be dangerous. Choose the name of the type of hazard for each description. Circle the correct answer. Could cause slight swelling or redness on skin: irritant/corrosive Could burn skin and eyes: irritant/corrosive (2 marks) 2 Match the type of substance with the pH that they will be. Substance PH neutral less than 7 alkali greater than? acid equal to 7 (2 marks) 3 a Complete the sentences below about the chemical properties of metals and non-metals by circling the correct answers from the choices in bold. When a metal or a non-metal reacts with oxygen an oxide/oxate is formed. At room temperature (20PC)metal oxides are mostly solids/gases and non-metal oxides are mostly solids/gases. They are also different types of substances. Non-metal oxides are mostly bases/acids and metal oxides are mostly bases/acids. (4 marks) Complete the word equation for the reaction of a metal and an acid. metal+acidarrow (2 marks) 4 a List three properties of metals. b Name a metal and a non-metal that is liquid at room temperature. Non-metal: may have

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Reactions 6 a Look at the statements below. Tick the ones that show a chemical reaction is taking place. square New substances are made. square You can get back what you started with. square You notice a sweet smell being produced. square The substance dissolves when being stirred into water. square Bubbles appear in the substance. (3 marks) Look at the picture of the student carrying out the experiment Identify one safety precaution she is following. c When using liquids they may be dangerous. Choose the name of the type of hazard for each description. Circle the correct answer. Could cause slight swelling or redness on skin: irritant/corrosive Could burn skin and eyes: irritant/corrosive (2 marks) 2 Match the type of substance with the pH that they will be. Substance PH neutral less than 7 alkali greater than? acid equal to 7 (2 marks) 3 a Complete the sentences below about the chemical properties of metals and non-metals by circling the correct answers from the choices in bold. When a metal or a non-metal reacts with oxygen an oxide/oxate is formed. At room temperature (20PC)metal oxides are mostly solids/gases and non-metal oxides are mostly solids/gases. They are also different types of substances. Non-metal oxides are mostly bases/acids and metal oxides are mostly bases/acids. (4 marks) Complete the word equation for the reaction of a metal and an acid. metal+acidarrow (2 marks) 4 a List three properties of metals. b Name a metal and a non-metal that is liquid at room temperature. Non-metal: may have

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A) In the given question statements, to show a chemical reaction: - New substances are made. (Yes. A chemical reaction typically results in the formation of new products) - You can get back what you started with. (No. This implies a physical change where the initial substances can be recovered). - You notice a sweet smell being produced. (Yes. Change in smell is a sign of a chemical reaction as new substances are formed with different chemical properties) - Bubbles appear in the substance. (Yes. Production of gas, often observed as bubbles, indicate a chemical change) - The substance dissolves when being stirred into water. (No. Dissolving is a type of physical change, not chemical change) So, the ones that show a chemical reaction is taking place are: new substances are made, you notice a sweet smell being produced, and bubbles appear in the substance.B) Based on the given data, we can't actually see the picture of the student doing the experiment. However, commonly followed safety precautions include wearing lab coat, using safety goggles, wearing gloves, operating equipment safely etc.C) - Could cause slight swelling or redness on skin: Irritant - Could burn skin and eyes: Corrosive D) Substance and corresponding pH are matched up as: - Neutral is equal to 7 - Less than 7 represents an Acid - Greater than 7 behaves as Alkali E) The correct answers for the properties of metals and non-metals reacting with oxygen are: - When a metal or a non-metal reacts with oxygen, an Oxide is formed. - At room temperature (20 degree Celsius), metal oxides are mostly solids and non-metal oxides are also mostly solids. - Non-metal oxides are features of Acids while metal oxides display the characteristics of Bases.F) In the cation of a metal and an acid creating an salt and hydrogen gas, we can write the word equation as: "metal + acid yields a salt + hydrogen".G) Three physical properties of metals: - Metals are generally lustric, i.e., they have a shining surface. - Metals, in general, are hard, but alkali metals (liken a )are so soft that they can even be cut with a knife. - Metals are good conductors of electricity H) - Metal that is liquid at room temperature: Mercury - Non-Metal that is liquid at room temperature: BromineFinal answers are:(A) New substances are made, You notice a sweet smell being produced, and Bubbles appear in the substance (B) based on the given description, It is not possible to state the observed safety precaution. (C) Slight swelling or redness is caused by irritants and skin/eyes burn are caused by corrosives. (D) pH scale: neutral = 7, acid 7 (E) In reaction with oxygen, metals and non-metals form an oxide. Both metal oxide and non-metals oxide are mostly solids. Then, non-metal oxides are mostly acids and metal oxides are mostly bases.(F) In reaction of a metal with an acid: Metal + Acid = Salt + Hydrogen (G) Metals are often lustric, hard, and good conductors of electricity (H) Mercury is a liquid metal at room temperature and Bromine is the non-metal which is liquid at room temperature.

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