Textbook Questions
| 1. | Law of combination Difficulty: easy | 
                                    
                                    2
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| 2. | Law of chemical combination Difficulty: medium | 
                                    
                                    3
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| 3. | Law of chemical combinations Difficulty: medium | 
                                    
                                    2
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Practice Questions
| 1. | Atomic theory Difficulty: easy | 
                                    
                                    4
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