scope of chemistry

what is chemistry

Chemistry is the study of matter and energy and how they interact, mainly at the level of atoms and molecules. Basic concepts in chemistry include chemicals, which are specific types of matter, and chemical reactions. In a chemical reaction, atoms or molecules of certain types of matter combine chemically to form other types of matter. All chemical reactions involve energy. Q: How do you think chemistry explains why the copper on the Statue of Liberty is green instead of brownish red? A: The copper has become tarnished. The tarnishalso called patinais a compound called copper carbonate, which is green. Copper carbonate forms when copper undergoes a chemical reaction with carbon dioxide in moist air. The green patina that forms on copper actually preserves the underlying metal. Thats why its not removed from the statue. Some people also think that the patina looks attractive.

chemistry and you

Chemistry can help you understand the world around you. Everything you touch, taste, or smell is made of chemicals, and chemical reactions underlie many common changes. For example, chemistry explains how food cooks, why laundry detergent cleans your clothes, and why antacid tablets relieve an upset stomach. Other examples are illustrated in the Figure 1.1. Chemistry even explains you! Your body is made of chemicals, and chemical changes constantly take place within it. Each of these pictures represents a way that chemicals and chemical reactions af- fect our lives.

textbook_image

instructional diagrams

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questions

basic concepts in chemistry include

a) atoms and molecules.

b) chemical reactions.

c) energy.

-->  d) all of the above

which of the following changes involve(s) chemical reactions?

a) candle burning

b) fruit spoiling

c) meat cooking

-->  d) all of the above

diagram questions

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