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WORKSHEET-1 MATTER-1 SUPPLEMENTARY QUESTIONS 1. Substances m.p (0C) x 40 y -4 z 12 b.p (0C) 142 110 130 a) At room temperature (250C) , what are the physical states of x, y, and z? b) Can X be a mixture? Why? 2. Fill in the blanks. Symbol or formula Ca HCl ……. ……. 3. 9. Fill in the blanks a) b) c) d) e) f) Name Iron Sodium Silver ................ ................ ................. Symbol ........... ............ ............ P Cu Si 10. In laboratory, if your teacher gives you a test tube in which there is an unknown liquid, suggest a method to understand whether this liquid is a pure substance or not? Name ……… ……… Acetic acid Sulphuric acid (exp)You want to measure the density of a stone. You measured its mass as 125 g. When you put it into a beaker that has 100 ml. of water, volume increases to 150 ml. 11. Fill in the blanks. a) Water boils at 1000C or ………K. b) The change from solid into gas is called ……………… c) The color of gaseous iodine is ……………… d) 1 m3 is equal to ……… ml. e) An example of suspension is ..………… a) What is the density of the stone? b) Stone + Water mixture can be an example to …............... c) Why does not stone float on water? 4. Hydrogen can be burned, and oxygen helps burning. But the compound water can not be burned and does not help burning. Why? 5. What is the mass of 4 m3 of water? ( dwater=1 g/ml ) 6. For Fe, S, salty water and oil +water, answer the following questions. a) Which ones are homogeneous? ...................................................... b) Which ones are pure ? ...................................................... c) Which ones do not have a definite boiling point?.............................. d) Which one is not uniform? ....................................... e) Which one has no mass? ........................... 7. Classify the following mixtures as homogeneous or heterogeneous. a) sand + water c) salt – sugar 8. b) air d) alcohol – water Wood and stone do not have standard (constant) boiling and melting points. What can the reason be? Explain. unasanacollege.edu.ba 12. How can you separate the mixture of a) oil-water b) sand-water c) sand – sugar d) alcohol-water e) iron powder- sugar 13. Give 10 metals and nonmetals with their symbols and names. 14. Determine the following changes whether they are physical or chemical. a) melting of ice c) burning of paper e) cutting of wood b) rusting of iron d) formation of snow f) digestion of food 15. Find the results of the following calculations in the desired units. a) 400K – 270C =...........0C b) –300C + 250K=............K c) 27ml + 23cm3 =............L d) 20dm3 + 20L =............ml e) 1kg + 1000g =............kg f) 1g + 1000mg =............kg