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Che 110: Basic Chemistry I Question Paper

Che 110: Basic Chemistry I

Course:Bachelor Of Education

Institution: Moi University question papers

Exam Year:2012

MOI UNIVERSITY
Bsc (Science), BEd (Science) and BEd (Technology)

University Continuous Assessment Test (CAT) 2012
CHE 110-BASIC CHEMISTRY I

INSTRUCTIONS
Answer ALL questions
some important constants: Avogadros constant = 6.02 x 10^23, Plank's constant = 6.63 x 10^-34 J.s, mass of an electron = 9.1094 x 10^-28 g
1. Define the following terms:
i. Orbital
ii. Isotopes (2mks)

2. State the three postulates of Bohr atomic theory of 1913 (3mks)

3. Give the observations recorded by E. Rutherford in his alpha particle scattering experiment. Explain these observations. (5mks)

4. Calculate the de Broglie wavelength of an electron moving with a velocity of 1.20 x 10 m/s. (4mks)

5. A sample of Sodium nitrate weighs 0.38g is placed in a 50.0 ml volumetric flask, the flask is them filled with water to the mark on the neck. What is the molarity of the resulting solution? (2mks)

6. State the Aufbau principle and draw the schematic structure for the arrangement of electrons in atomic orbitals. (3mks)

7. Consider the elements with atomic numbers 9, 17, 27 and 52.
i. Write the electronic configuration of these elements. (4mks)
ii. Identify the group and period each of the elements with atomic numbers 9, 27 belong to. (2mks)

8. Draw the shapes of the 3d orbitals. (5mks)

Che 110: Basic Chemistry I Question Paper

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