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BIPS VISION “Conducive & holistic learning atmosphere” Name: ………………… Year 9/Section: …… Date:…………….. Chemistry– Reinforcement Worksheet Unit 4 and 5 1. Some reactions are endothermic. How does the temperature and energy change in an endothermic reaction? temperature change energy change A B C D energy taken in energy given out energy taken in energy given out decreases decreases increases increases 2. When ammonium chloride dissolves in water the temperature falls. The type of energy change is described as? a. activated b. exothermic c. a decomposition d. endothermic 3. When an exothermic reaction takes place, the reaction mixture gets hotter because? a. exothermic changes always produce gases b. more energy is released when new bonds are made than is needed to break existing bonds c. in an exothermic change the products are less stable than the reactants d. energy is always released in a chemical change which makes new substances. 4. When ammonium nitrate is added to water, an endothermic reaction occurs and? a. the temperature falls BIPS VISION “Conducive & holistic learning atmosphere” b. the temperature rises c. heat is given out d. the surroundings get hotter 5. Methanol can be made when methane reacts with oxygen. 1 (a) The energy level diagram for this reaction is shown below. 1 (a) (i) What is the energy change represented by A? 1 (a) (ii) Use the energy level diagram to explain how it shows that this reaction is exothermic. 6. 7. An example of an exothermic reaction is: a. the lighting of a match BIPS VISION “Conducive & holistic learning atmosphere” b. an instant cold pack c. when two chemicals are added together d. evaporation of water e. the breaking of bonds 8. BIPS VISION “Conducive & holistic learning atmosphere” 9. 10.Complete the following sentences about the Periodic Table of elements using words from the list below. argon one colour density sodium similarity trend seven BIPS VISION “Conducive & holistic learning atmosphere” Chlorine, bromine and iodine are elements in Group ......................... of the Periodic Table. These elements show a ......................... in ......................... down the group. They all react rapidly with ......................... to form ionic compounds. 11. Three of the halogens in Group VII are listed below. chlorine bromine iodine (a) (i) How does their colour change down the Group? ................................................................................................................... (ii) How do their melting points and boiling points change down the Group? ..................................................................................................................... (iii) Predict the colour and physical state (solid, liquid or gas) of astatine, At. colour ......................................................................................................................... physical state ....................................................................................................... 12. BIPS VISION “Conducive & holistic learning atmosphere”