the answer of mid semester test

Answer 1.a element because it can change from solid to liquid form and can not freeze again, and not combined as a compound b. because of the solid into the liquid compound is need at the heat of nature so that heat absorption by the substance c. because the elements are always located in room temperature and is stable and what if in the heat or cold it will change its shape alone 


2. I think if the case is not appropriate because it is more than the weight of the object at the initial reaction of 10 g.sedangkan law of conservation of that time period is always constant seblum reaction or after the reaction occurred 


3. namely by the combustion reaction so that elements can be separated from each other 


4. Mendeleev predicted correctly in my opinion he is able to predict that one day will find elements in new and mnyediakan place, because the model formulation is based on the Mendeleev periodic table atomic mass increases and the nature kemiripanya. 


5.