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Questions in chemistry

[Done] What is the most important similarity between rusting and burning?

[Done] What are hypotonic, isotonic, and hypertonic solutions?

[Done] What type of reaction is [tex] \text{FeSO}_4 + \text{Al} \rightarrow \text{Al}_2(\text{SO}_4)_3 + \text{Fe} [/tex] and why?

[Done] What is ultrafiltration?

[Done] Why is silicon used to make PV cells?

[Done] What happens when zinc carbonate is calcined?

[Done] How many grams of aluminum sulfide can form from the reaction of 9.00 g of aluminum with 8.00 g of sulfur?

[Done] Hydrogen is found primarily as two isotopes in nature: (1.0078u) and (2.0140u). Calculate the percentage abundance of each isotope based on hydrogen's average atomic mass.

[Done] A compound consists of 17.6% hydrogen and 82.4% nitrogen. Determine the empirical formula of the compound.

[Done] A logical, systematic approach to the solution of a scientific problem: 1. Scientific Method 2. Scientific Law 3. Chemistry 4. Experiment