Chemistry homework

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Universidad Autónoma de Nuevo León
Preparatoria •7

Activity IV.1
Second Semester

The characteristic properties of any substance that arerelated to the way on which this substance changes its composition, or on how do they relate to other substances are known as chemical properties and they manifest when this substance experiences achemical change.
The processes that involve a chemical change where one or more substances are used up while new substances are formed receive the name of chemical reactions. Therefore, when we use theterm chemical reaction we are including the chemical properties of the substances involved in the process of change.
Investigation Tasks
Perform the following tasks that will help you to solve theproblem.
1. Using the internet, encyclopedias or chemistry books investigate the following:
a) Four chemical properties of the six chemical substances
1. Reactivity against other chemicalsubstances
2. Heat of combustion
3. Enthalpy of formation
4. Toxicity

b) The activity series of metals
1. Each element on the list replaces from a compound any of the elements below it. Thelarger the interval between elements, the more vigorous the reaction.
2. The first five elements (lithium - sodium) are known as very active metals and they react with cold water to produce thehydroxide and hydrogen gas.
3. The next four metals (magnesium - chromium) are considered active metals and they will react with very hot water or steam to form the oxide and hydrogen gas.
4. Theoxides of all of these first metals resist reduction by H2.
5. The next six metals (iron - lead) replace hydrogen from HCl and dil. sulfuric and nitric acids. Their oxides undergo reduction by heatingwith H2, carbon, and carbon monoxide.
6. The metals lithium - copper, can combine directly with oxygen to form the oxide.
7. The last five metals (mercury - gold) are often found free in nature,...
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