7. (10 points) Indicate the type of crystal (molecular, metallic, ionic, or covalent-network) each of the following would form upon solidification a. Na2CO3 molecular metallic ionic covalent-network b. Cu molecular metallic ionic covalent-network C. acetone molecular metallic ionic covalent-network d. Mg molecular metallic ionic covalent-network 5004 e. C molecular metallic ionic covalent-network 49

Give the formula of a solid containing Si that is (a) molecular (b) ionic (c) network covalent

The test tubes shown here contain equal amounts of the specified motor oils. Identical metal spheres were dropped at the same time into each of the tubes, and a brief moment later, the spheres had fallen to the heights indicated in the illustration. Rank the motor oils in order of increasing viscosity, and explain your reasoning:

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