Reference no: EM132753742

Will a closed container of water at 70° C If you get boiling water t 100° C C or an open container of water at the same temperature cool faster o a cold winter day? Explain why.

1. If water at room temperature is placed in a flask that is connected to a vacuum pump and then lowers the pressure in the flask, we observe that the volume of the water decreases and the remaining water turns into ice. Explain what has happened.
2. on your skin, it burns. If you get 100° steam on your skin, it burns much more severely. Explain why this is so.
3. Butane is a gas at room temperature, however, if u look closely at a butane lighter you see it contains liquid butane. How is this possible?
4. Explain why diamond is an electrical insulator and graphite is an electrical conductor.
5. What type of solid exhibits each of these sets of properties? a. Melts below 100° C and is insoluble to water. b. Conducts electricity only when melted.
6. The molecular structure of water makes it a good solvent for many substances. (a) For what types of substances is water a good solvent? Explain why. (b) For what types of substances is water a poor solvent? Explain why.
7. Water can participate in hydrogen-bonding with other water molecules. In liquid water, how many hydrogen bonds does each water molecule engage in? What three-dimensional shape do these bonds assume?
8. Classify each of these solids as ionic, metallic, molecular, network, or amorphous. a. KF b. I2 c. SiO2 d. BN
9. On the basis of the description given, classify each of these solids as molecular, metallic, ionic, network or amorphous and explain ur reasoning.

A. A soft, slippery solid that has no definite melting point but decomposes at temperatures above 250° C; the solid does not conduct electricity.

B. Violet crystals that melt at 114° C and whose vapor irritates the nose; neither the solid nor the liquid conducts electricity.