Name Class ……………………………… ……………………………. Chemistry Chemical Analysis C10 for triple and double science – Diagnostic homework Q1. A student investigated an egg (a) The student did some tests on the egg shell. The student’s results are in the table below. Test Observation A gas was produced. Dilute hydrochloric acid was 1 added to the egg shell. The egg shell dissolved, forming a colourless solution. A flame test was done on the 2 The flame turned red. colourless solution from test 1. Sodium hydroxide solution was A precipitate formed that did not 3 added to the colourless solution dissolve in excess sodium hydroxide from test 1. solution. Silver nitrate solution was added 4 to the colourless solution from A white precipitate formed. test 1. (i) The student concluded that the egg shell contains carbonate ions. Describe how the student could identify the gas produced in test 1. (2) (ii) The student concluded that the egg shell contains aluminium ions. Is the student’s conclusion correct? Use the student’s results to justify your answer. (2) (iii) The student concluded that the egg shell contains chloride ions.
Name ……………………………… Class ……………………………. Chemistry – Chemical Analysis C10 for triple and double science Diagnostic homework Q1. A student investigated an egg (a) The student did some tests on the egg shell. The student’s results are in the table below. Test Observation 1 Dilute hydrochloric acid was added to the egg shell. A gas was produced. The egg shell dissolved, forming a colourless solution. 2 A flame test was done on the colourless solution from test 1. The flame turned red. 3 Sodium hydroxide solution was added to the colourless solution from test 1. A precipitate formed that did not dissolve in excess sodium hydroxide solution. 4 Silver nitrate solution was added to the colourless solution from test 1. A white precipitate formed. (i) The student concluded that the egg shell contains carbonate ions. Describe how the student could identify the gas produced in test 1. (2) (ii) The student concluded that the egg shell contains aluminium ions. Is the student’s conclusion correct? Use the student’s results to justify your answer. (2) (iii) The student concluded that the egg shell contains chloride ions.