Essay Quiz


1		How is an empirical formula like and unlike a molecular formula?



2		Describe the basic parts of a chemical equation. Identify how the physical state of elements and compounds is identified in an equation.



3		What is the law of conservation of mass? How do you know if a chemical equation is in accord with this law?



4		Describe in your own words how a chemical equation is balanced.



5		What is a hydrocarbon? What is a carbohydrate? In general, what are the products of complete combustion of hydrocarbons and carbohydrates?



6		Define and give an example in the form of a balanced equation of (a) a combination reaction, (b) a decomposition reaction, (c) a replacement reaction, and (d) an ion exchange reaction.



7		What must occur in order for an ion exchange reaction to take place? What is the result if this does not happen?



8		Predict the products for the following reactions: (a) The combustion of ethyl alcohol, C₂H₅OH, (b) the rusting of aluminum, and (c) the reaction between iron and sodium chloride.



9		The formula for butane is C₄H₁₀. Is this an empirical formula or a molecular formula? Explain the reason(s) for your answer.



10		How is the activity series for metals used to predict if a replacement reaction will occur or not?



11		What is a gram-formula weight? How is it calculated?



12		What is the meaning and the value of Avogadro's number? What is a mole?

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