Chemistry Far and Wide
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1 Chemistry 1 of 31 Chemistry Far and Wide The first tools were objects such as a stone with a sharp edge. In time, people learned to reshape these objects to produce better tools. Chemistry plays a key role in the production of new materials. 2 of 31 1
2 Materials Materials What impact do chemists have on materials, energy, medicine, agriculture, the environment, and the study of the universe? 3 of 31 Materials Chemists design materials to fit specific needs. 4 of 31 2
3 Materials In 1948, George de Mestral took a close look at the burrs that stuck to his clothing. He saw that each burr was covered with many tiny hooks. In 1955, de Mestral patented the design for the hook-andloop tapes. These are used as fasteners in shoes and gloves. 5 of 31 Materials This story illustrates two ways of looking at the world the macroscopic view and the microscopic view. Burrs belong to the macroscopic world, the world of objects that are large enough to see with the unaided eye. The hooks belong to the microscopic world, or the world of objects that can be seen only under magnification. 6 of 31 3
4 Energy Energy Chemists play an essential role in finding ways to conserve energy, produce energy, and store energy. 7 of 31 Energy Conservation One of the easiest ways to conserve energy is through insulation. Insulation acts as a barrier to heat flow from the inside to the outside of a house or from the outside to the inside of a freezer. 8 of 31 4
5 Energy SEAgel is a modern insulation that is light enough to float on soap bubbles. 9 of 31 Energy Production The burning of coal, petroleum, and natural gas is a major source of energy. These materials are called fossil fuels. Oil from the soybeans is used to make biodiesel. 10 of 31 5
6 Energy Storage Batteries are devices that use chemicals to store energy that will be released as electric current. For some applications, it important to have batteries that can be recharged rather than thrown away. Digital cameras, wireless phones, and laptop computers use rechargeable batteries. 11 of 31 Medicine and Biotechnology Medicine and Biotechnology Chemistry supplies the medicines, materials, and technology that doctors use to treat their patients. 12 of 31 6
7 Medicine and Biotechnology Medicines There are over 2000 prescription drugs. Many drugs are effective because they interact in a specific way with chemicals in cells. Knowledge of the structure and function of these target chemicals helps a chemist design safe and effective drugs. 13 of 31 Medicine and Biotechnology Materials Chemistry can supply materials to repair or replace body parts. Artificial hips and knees made from metals and plastics can replace worn-out joints and allow people to walk again without pain. 14 of 31 7
8 Medicine and Biotechnology Biotechnology From 1990 to 2003, scientists worldwide worked on the Human Genome Project. They identified the genes that comprise human DNA about 30,000. The discovery of the structure of DNA led to the development of biotechnology. 15 of 31 Medicine and Biotechnology Biotechnology applies science to the production of biological products or processes. 16 of 31 8
9 Agriculture Agriculture Chemists help to develop more productive crops and safer, more effective ways to protect crops. 17 of 31 Agriculture Productivity One way to track productivity is to measure the amount of edible food that is grown on a given unit of land. Chemists test soil to see if it contains the right chemicals to grow a particular crop and recommend ways to improve the soil. 18 of 31 9
10 Agriculture Chemists also help determine when a crop needs water. If the genes from a jellyfish that glows are transferred to a potato plant, the plant glows when it needs to be watered. 19 of 31 Agriculture Crop Protection Chemists sometimes use chemicals produced by insects to fight insect pests. The plastic tube wrapped around the stem of the tomato plant contains a chemical that a female pinworm moth emits to attract male moths. It interferes with the mating process so that fewer pinworms are produced. 20 of 31 10
11 The Environment The Environment A pollutant is a material found in air, water, or soil that is harmful to humans or other organisms. Chemists help to identify pollutants and prevent pollution. 21 of 31 The Environment Identify Pollutants Until the mid-1900s, lead was used in many products, including paints and gasoline. A study done in 1971 showed that the level of lead that is harmful to humans is much lower than had been thought, especially for children. Even low levels of lead in the blood can permanently damage the nervous system of a growing child. 22 of 31 11
12 The Environment Prevent Pollution The strategies used to prevent lead poisoning include testing children s blood for lead, regulation of home sales to families with young children, and public awareness campaigns with posters. 23 of 31 The Environment The percentage of children with elevated blood levels has decreased since the 1970s. 24 of 31 12
13 The Universe The Universe To study the universe, chemists gather data from afar and analyze matter that is brought back to Earth. 25 of 31 The Universe Chemists have analyzed more than 850 pounds of moon rocks that were brought back to Earth. Some of these rocks are similar to rocks formed by volcanoes on Earth, suggesting that vast oceans of molten lava once covered the moon's surface. 26 of 31 13
14 The Universe The robotic vehicle Opportunity was designed to determine the chemical composition of rocks and soil on Mars. Data collected at the vehicle s landing site indicated that the site was once drenched with water. 27 of 31 14
Chemists design materials to fit specific needs.
Chemistry Chemistry Far and Wide The first tools were objects such as a stone with a sharp edge. In time, people learned to reshape these objects to produce better tools. Chemistry plays a key role in
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