Tutorial 1 General Chemistry PDF - CH4001/CH4701

Tutorial 1 General Chemistry CH4001 / CH4701 1. All of the following are heterogeneous mixtures except (a) vodka. (b) mud (c) a rock. (d) sour cream. (e) a precipitate in water. 2. Which of the following would be classified as a mixture? (a) seawa...

Tutorial 1 General Chemistry CH4001 / CH4701 1. All of the following are heterogeneous mixtures except (a) vodka. (b) mud (c) a rock. (d) sour cream. (e) a precipitate in water. 2. Which of the following would be classified as a mixture? (a) seawater (b) boiling water (c) ice (d) sugar (e) baking soda 3. The correct classifications for air, sea water, helium and concrete respectively are (a) element, mixture, element and compound (b) mixture, element, compound and compound (c) mixture, compound, element and mixture (d) compound, mixture, compound and element (e) mixture, mixture, element and mixture 4. A match is lit and held under a cold piece of metal. The following observations are made  the match burns chemical  the metal gets warmer physical  water condenses on the metal physical  soot (carbon) forms and is deposited on the metal chemical Which of the above are due to physical changes, and which are due to chemical changes? 5. Filtration is the process (a) used to separate a mixture of sand and gold dust. (b) used to remove dissolved sugar from water. (c) used to separate dissolved salts from seawater. (d) used to separate a solid from a liquid. (e) used to separate two gases. 6. Which of the following statements is incorrect? (a) Fe is an element correct (b) H2O is a compound correct (c) Nitrogen is an element correct (d) N2 is a molecule correct (e) Air is a pure substance incorrect , air is a mixture of gas 7. Study the diagrams representing elements, compounds and mixtures shown, and choose the correct statement from the following a. incorrect Z represent an molecule (a) X represents an element and Z represents a mixture b. correct (b) X represents an element and W represents a mixture c. incorrect as the atoms in Y are diffrent (c) Y represents an element and W represents a mixture sizes therfor different atoms (d) Y represents a compound and Z represents a mixture d. incorrect Z is not a mixture (e) X represents an element and Y represents a mixture e. incorrect Y is not a micture z is a compound W is a mixture of elements and compounds X is an element or atom Y is a molecule or compound