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Sodium Thiosulphate Investigation

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Introduction

No. Question Answer 1 What is the middle of the atom called? The nucleus. 2 What two types of particle are found here? Protons and neutrons. 3 The electrons are arranged in shells (also called energy levels). How many can be held in the first shell? Two. 4 How many can be held in the second shell? Eight. 5 How many can be held in the third shell? Eight. 6 Where are the non-metals located in the periodic table? In the top right-hand corner. 7 What are the horizontal rows in the periodic table called? Periods. 8 What are the vertical columns called? Groups. 9 What is the name of Group 1? The Alkali Metals. 10 What is the name of Group 7? The Halogens. 11 What is the name of Group 0? The Noble Gases. 12 Elements in the same group have the same number of what? The same number of outer electrons. 13 Do elements in the same group have similar chemical or similar physical properties? Similar chemical properties. ...read more.

Middle

1. Killing bacteria in water. 2. Making bleaches. 27 What does bromine look like? A red -brown liquid (which evaporates easily to make an orange-brown gas). 28 What colour is bromine dissolved in water? Orange-brown. 29 What is the name of the compound formed when potassium reacts with bromine? Potassium bromide. 30 What colour is this compound when dissolved in water? Colourless. 31 What does iodine look like? A shiny grey-black solid (which produces a purple gas when gently heated). 32 What colour is iodine dissolved in water? Brown. 33 What is this iodine solution used for? An antiseptic. 34 What is the name of the compound formed when sodium reacts with iodine? Sodium iodide. 35 What colour is this compound when dissolved in water? Colourless. 36 What is the name of compounds of the halogens? Halides. 37 List two observations when sodium reacts with chlorine. 1. The metal burns with a yellow flame. 2. A white solid is produced. 38 What is the name of the product of this reaction? Sodium chloride. 39 What is its chemical formula? NaCl 40 List two observations when iron wool reacts with chlorine. ...read more.

Conclusion

50 What is meant by reaction rate? How fast a reaction goes. 51 List four ways of increasing the rate of a reaction. 1. Increasing the temperature. 2. Increasing the concentration of a reactant. 3. Increasing the surface area of a solid.4. Adding a catalyst. 52 What is a catalyst? A chemical which speeds up a reaction but which does not get used up. 53 Does the catalyst appear in the chemical equation for the reaction? No (because it does not get used up). 54 What are enzymes? Catalysts produced by living things. 55 Why don't enzymes work if the temperature is too high? They become denatured (damaged) by the heat. 56 What two things about line A show that it represents a faster reaction? 1. It starts more steeply. 2. It levels off sooner. 57 How can you tell that both lines A and B were obtained using the same amounts of the reactants? They both produced the same amount of product in the end. 58 Increasing the temperature makes the particles move around more quickly. Give two reasons why this makes the reaction faster. 1. The collisions occur more often. 2. More of the collisions have enough energy to lead to a reaction ...read more.

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