photo.jpg

## Dalton's Atomic Theory and the Modern Atomic Theory ### 1.2 Dalton's Atomic Theory and the Modern Atomic Theory At the end of this section you will be able to: * State postulates of Dalton’s atomic theory * State postulates of the modern atomic theory * State the laws of conservation of mass,...

## Dalton's Atomic Theory and the Modern Atomic Theory ### 1.2 Dalton's Atomic Theory and the Modern Atomic Theory At the end of this section you will be able to: * State postulates of Dalton’s atomic theory * State postulates of the modern atomic theory * State the laws of conservation of mass, definite proportions, multiple proportions and the basis of each of these laws * Use postulates of Dalton’s atomic theory to explain the laws of definite and multiple proportions * Discuss in detail about early experiments * Evaluate postulates of Dalton’s and the modern atomic theories. ### 1.2.1 Postulates of Dalton’s Atomic Theory **Activity 1.2** Recall your Grade 9 knowledge in order to answer the following questions in groups, and share your responses with the whole class. 1. Describe the five postulates of Dalton’s atomic theory. 2. How do the scientific ideas develop based on previous scientific findings? Scientific laws usually develop based on previous scientific findings. The laws that are the basis for Dalton’s atomic theory are the *law of conservation of mass* and the *law of definite proportions*. What is the law that Dalton formulated based on the law of conservation of mass and the law of definite proportions? Write its statement in your notebook.