(T)|(F) Chemistry is the study of matter and the changes it undergoes. (T)|(F) T
ID: 481620 • Letter: #
Question
(T)|(F) Chemistry is the study of matter and the changes it undergoes. (T)|(F) The technology of smelting metals into ores was performed long before the science of metallurgy evolved. (T)|(F) A scientific law summarizes data while a scientific theory explains the data. (T)|(F) The SI unit of length is the kilometer. (T)|(F) Density is equal to mass times volume. (T)|(F) Science does not prove a theory or hypothesis to be true. It can only prove something false. (T)|(F) Leucippus and Democritus based their ideas about atoms on careful experimental results. (T)|(F) During a chemical reaction, matter can neither be created nor destroyed. (T)|(F) Ammonia (NH_3) and hydrazine (N_2 H_4)are compounds of only hydrogen and nitrogen. These compounds illustrate the law of multiple proportions. (T)|(F) A molecule is a group of atoms that are chemically bonded together. MULTIPLE CHOICE [2] [2]Science is tentative, explanatory, and __________ absolute. testable. unpredictable. mystical. [2] Which term best fits this definition: a statement that summarizes the data obtained from observation? hypothesis law theory modelExplanation / Answer
1.The answer is True.
Chemistry is the study of matter and the changes it undergoes.
In other words chemistry is the study of the composition, structure, and properties of matter, the processes that matter undergoes, and the energy changes that accompany these processes.
2. True
Smelting, process by which a metal is obtained, either as the element or as a simple compound, from its ore by heating beyond the melting point, ordinarily in the presence of oxidizing agents, such as air, or reducing agents, such as coke. The first metal to be smelted in the ancient Middle East was probably copper (by 5000 bc), followed by tin, lead, and silver.
Metallurgy is the science of extracting metals from their ores and modifying the metals for use. Metallurgy customarily refers to commercial as opposed to laboratory methods. It also concerns the chemical, physical, and atomic properties and structures of metals and the principles whereby metals are combined to form alloys. The present-day use of metals is the culmination of a long path of development extending over approximately 6,500 years.
3.
The answer is True.
A scientific law is a statement based on repeated experimental observations that describes some aspects of the universe.
A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment.
4. The answer is False.
The SI unit of length is meter
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