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The sky is blue on a sunny day, yet red or orange at  sunrise and sunset . The different colors are caused by scattering of light in the Earth's atmosphere. Here is a  simple experiment  you can do to see how this works: Blue Sky - Red Sunset Materials water milk transparent container with flat parallel sides flashlight A small rectangular aquarium works well for this experiment. Try a 2-1/2-gallon or 5-gallon tank. Any other square or rectangular clear glass or plastic container will work. Conduct the Experiment Fill the container about 3/4 full of water. Turn on the flashlight and hold it flat against the side of the container. You probably won't be able to see the beam of the flashlight, although you may see bright sparkles where the light strikes dust, air bubbles, or other small particles in the water. This is much like how sunlight travels through space. Add about 1/4 cup of milk (for a 2-1/2 gallon container -- increase the a...

Heterogeneous and homogeneous refer to mixtures of materials in chemistry. The difference between  heterogeneous and homogeneous mixtures is the degree at which the materials are mixed together and the uniformity of their composition. A  homogeneous mixture  is a mixture where the components that make up the mixture are uniformly distributed throughout the mixture. The composition of the mixture is the same throughout. There is only one phase of matter  observed in a homogeneous mixture

You know if you put fresh cut flowers in water it  will help  keep them from wilting. If you have a packet of cut flower preservative from a florist or the store, it  will help the flowers to stay fresh much longer. You can make cut flower preservative youself, however. There are several good recipes, made using common household ingredients. Keys to Keeping Cut Flowers Fresh Give them water. Give them food. Protect them from decay or infection. Keep them cool and out of direct sunlight. The  floral preservative  provides flowers with water and food and contains a disinfectant to prevent bacteria from growing. Making sure your vase is clean will also help. Discard any decaying leaves or flowers, because the freshness of flowers is influenced by the gases and bacteria found on wilted or rotting plant material. Also, don't set your flowers near ripe fruit, because the chemicals from the fruit (such as ethylene) will 'ripen' your flowers. If you can,...

Medicinal chemistry  is a stimulating field as it links many scientific disciplines and allows for collaboration with other scientists in researching and developing new drugs. Medicinal chemists  apply their  chemistry training to the process of synthesizing new pharmaceuticals.