100%(1)1 out of 1 people found this document helpful
This preview shows pages 1–3. Sign up to view the full content.
Print view Index of pages BackLesson BuilderLesson Part I: ESSENTIAL IDEAS Use this to add a new content item at the end of the page. Use + icons to add content at other points in the page. Main page content WEEK 1: ESSENTIAL IDEAS; MEASUREMENT AND PROBLEM SOLVINGLesson Part I: The Chemical World1.1 - Chemistry in ContextLEARNING OBJECTIVES By the end of this module, you will be able to: oOutline the historical development of chemistry oProvide examples of the importance of chemistry in everyday life oDescribe the scientific method oDifferentiate among hypotheses, theories, and laws oProvide examples illustrating macroscopic, microscopic, and symbolic domains Throughout human history, people have tried to convert matter into more useful forms. Our Stone Age ancestors chipped pieces of flint into useful tools and carved wood into statues and toys. These endeavors involved changing the shape of a substance without changing the substance itself. But as our knowledge increased, humans began to change the composition of the substances as well—clay was converted into pottery, hides were cured to make garments, copper ores were transformed into copper tools and weapons, and grain was made into bread. Humans began to practice chemistry when they learned to control fire and use it to cook, make pottery, and smelt metals. Subsequently, they began to separate and use specific components of matter. A variety of drugs such as aloe, myrrh, and opium were isolated from plants. Dyes, such as indigo and Tyrian purple, were extracted from plant and animal matter. Metals were combined to form alloys—for example, copper and tin were mixed together to make brass—and more elaborate smelting techniques produced iron. Alkalis were extracted from ashes, and soaps were prepared by combining these alkalis with fats. Alcohol was produced by fermentation and purified by distillation.
has intentionally blurred sections.
Sign up to view the full version.