Atomic Theory and Structure Early Ideas about Matter: From Democritus to Dalton

by Anthony Carpi, Ph.D.


1. Joseph Priestley discovered:

2. Who proposed the first atomic view of matter?

3. The ancient Greeks believed that matter was composed of four basic materials. Which one of the following was not one of the four?

4. Which one of the following is not part of Dalton's atomic theory?

5. A substance that cannot be broken down by chemical means into simpler substances is called a(n):

6. Which one of the following statements concerning the relationship between the number of elements and the number of compounds is correct?

7. The number of known elements at this time is approximately:

8. Which one of the following symbols represents an element?

9. Which one of the following symbols represents a compound?

10. Substances A and B combine chemically to form C. Substance C must be:

11. Although all parts of Dalton's atomic theory are important, which one of the postulates is crucial to explain the observations summarized by the Law of Definite Proportions?

12. No matter how much extra oxygen is available, 12 grams of carbon always combines with 32 grams of oxygen. This best illustrates the law of:

13. 12 grams of carbon react with 32 grams of oxygen to form exactly 44 grams of carbon dioxide. This is a good example of:

14. Who first proposed the law of definite proportions?

By convention there is color, by convention sweetness, by convention bitterness, but in reality there are atoms and space.
-Democritus
460-371 b.c.

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