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Use the dictionary, the acronym finder, and the word origins dictionary (links above) as needed. A new quiz is available each Monday through Thursday. This is the quiz for September 16.
John Dalton (died 1844) was an English chemist, meteorologist, and physicist. He is best known for his pioneering work in the development of modern atomic theory.
The five main points of his atomic theory are:
To be sure, the conviction that atoms cannot be subdivided into smaller particles is inconsistent with the existence of nuclear fusion and nuclear fission, but such processes are nuclear reactions and not chemical reactions. In addition, the idea that all atoms of a given element are identical in their physical and chemical properties is not precisely true, as we now know that different isotopes of an element have slightly varying weights. However, Dalton had created a theory of immense power and importance. Indeed, Dalton's innovation was fully as important for the future of the science as Antoine Lavoisier's oxygen-based chemistry had been.
- Elements are made of tiny particles called atoms.
- All atoms of a given element are identical.
- The atoms of a given element are different from those of any other element. The atoms of different elements can be distinguished from one another by their weights.
- Atoms of one element can combine with atoms of other elements to form chemical compounds.
- Atoms cannot be created, divided into smaller particles, nor destroyed in the chemical process - a chemical reaction simply changes the way atoms are grouped together.
1. An element isA. a particle.2. Lavoisier
B. a product of chemical reaction.
C. a substance that cannot be separated into simpler substances.
D. a molecule.A. recognized and named oxygen and hydrogen.3. Modern atomic theory recognizes
B. founded atomic theory.
C. learned about atomic weights.
D. lived in England.A. that all atoms of a given element are identical.4. Dalton led in the understanding of
C. that atoms cannot be destroyed.
D. that all atoms weigh the same.A. nuclear fission.
D. atomic theory.
The information comes from Wikipedia.
Write down your answers and then see Answer Key below.
Answer Key: 1-C..........2-A..........3-B..........4-D
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