The National Evangelical School in Nabatieh Name : Grade : 7 Date : Section : ( A,B ,C&D) Teacher : Fatima Halawani Subject : Chemistry Exercise 1 : True or false Answer by true or false and correct the false statements. a- Two non-miscible liquids form a homogenous mixture. b- Simple distillation consists of a condensation followed by a vaporization. c- The water obtained by simple distillation of salty water is called : distilled water . d- The liquid that passes through the filter paper is called residue. e- A mixture of oil and water can be separated by filtration . f- The separatory funnel is used to separate two miscible liquids. Exercise 2: Separation techniques (A) Name of technique Type of mixture Example of mixture 1- Copy and complete the above table. 2- Indicate the physical property the technique(A) depends on. (B) Exercise 3 : Part A A student went to the chemistry lab of his school and measured the density of three immiscible liquids : Vinegar , mercury and oil. He tabulated the results in the adjacent table. Liquid Vinegar oil mercury Density (g/cm3) 1.05 0.8 13.6 1- Specify the type of this mixture. Which mixture ?? 2- The three liquids formed three layers (X) , (Y) and (Z) as shown in the adjacent figure . Give the name of each layer. iLayer (x): iiLayer(Y): iiiLayer(z): 3- The student used the adjacent set up to separate the contents of the above beaker. He poured the three liquids in glassware (A). doc-1 a- Give the name of glassware (A). b- Name and define the corresponding separation technique. c- Justify the following statement : Can we use the above technique can not be used to separate a mixture of water and alcohol Justify your answer. Doc-1 Part (B) Consider a beaker containing a mixture (A) which is formed of sand , salt and water . we pour this mixture into a conical flask beaker through a funnel fitted with a filter paper as shown in document (1). Referring to document (2): 1- Identify the type of mixture (A). 2- How many phases are formed. Specify them. 3- Name the separation technique shown in the adjacent document. 4- Identify the residue and the filtrate. Doc-2
