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YEAR 10 CHEMISTRY MID TERM EXAM FOR IGCSE CAMBRIDGE

1. Define the following terms [4]

a. Isotope

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b. atom

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c. radioisotopes

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d. mixture

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2. Use [x] and [o] to show bonding in the following:- [10]

1. NaCl

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2. H2

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3. MgO

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4. NH3

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5. NH+4

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2. Differentiate between Ionic and Covalent bonds [2]

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3. How can you separate the following mixtures.

1. sulfur and iron [2]

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2. sand and salt[2]

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3. Iodine sublimes on heating. Sodium chloride dissolves in water while sulfur does not. Describe how you can separate the mixture of the 3 substances. [4]

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4.state the meaning of the following terms as used in metals [4]

1. malleable

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2. sonorous

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3. ductile

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4. brittle

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5. A chemistry class carried out an experiment to investigate rate of diffusion of two gases X and Y. The two gases were allowed to move across a membrane. Gas X had a mass of 32 while gas Y had a mass of 64.

1. Which gas crossed across the membrane faster. Explain [2]

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2. If the experiment was followed in lower temperature, describe what would happen to the results [3]

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3. When the student observed the particles of the gas moving across, they saw the particles moving in a jiggling zigzag manner.

a. what do we call this type of movement. [1]

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b. what causes the movement [2]

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c. If the set-up is taken in higher temperature, explain using the phrase kinetic energy of particles what would be observed. [2]

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6. Describe steps that you would take to identify substances in a colourless mixture. [Include the terms such as locating agent, solvent, rf value, solvent front and base line] [8]

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7. State two uses of chromatography in our lives today. [2]

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8. State the use of the following apparatus in separation of ethanol from water by fractional distillation.[3]

1. thermometer

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2. Fractionating column

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3. Condenser

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8. Draw heating curve of a pure solid and an impure solid in the same panel [4]

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9. draw and describe the pattern of arrangement of particles in solids liquids and gases [5] ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………