Chemical Reactions

The experiment is to observe a variety of chemical reactions and to identify patterns in

Introduction: In everything there are things called particles; and sometimes when two particles meet a chemical reaction occurs. Also, with different strategies the chemical reaction can be sped up or slowed down. This is measured with reaction rate which is used to measure the length of a chemical reaction.

A chemical reaction is when substances (reactants) change into other substances (products). The five general types of chemical reactions are synthesis (also known as direct combination), decomposition, single replacement (also known as single displacement), double replacement (also known as double displacement), and combustion. In this lab, the five general types of chemical reactions were conducted and observations were taken before, during, and after the reaction. Then the reactants and observations were used to determine the products to form a balanced chemical equation. The purpose of this lab was to learn and answer the question: How can observations be used to determine the identity of substances produced in a chemical reaction?

In a combustion reaction, a compound or element reacts with oxygen, releasing a large amount of energy in the form of light and heat.

There are now many classification systems to classify the different types of reactions. These include decomposition, polymerization, chain reactions, substitute reactions, elimination reactions, addition reactions, ionic reactions, and oxidation-reduction reactions.

Irreversible chemical reaction – where reactants can form products only, cannot go vice - versa vs reversible chemical reaction – where the reaction can go both sides

The diverse types of chemical reactions include Combination Reaction, Decomposition Reaction, Displacement Reaction and Oxidation Reaction.

In this experiment it was observed that not all chemical reactions occur at the same rate. Chemical reactions occur when one or more substances are changed into other substances. The properties of a chemical reaction require three things. First, they need a source of energy for molecules to encounter each other. Second, they require to proceed at a steady rate. Third, they must proceed in a particular direction until they reach equilibrium. There are two types of chemical reactions that can occur: endergonic and exergonic reactions. In these reactions there are both reactants and products. In exergonic reactions the reactants (starting materials of a reaction) are higher than the products (results of a reaction). This is opposite for endergonic

- 3058 kJ/mol = [6 (- 393.5) + 3 (- 285.85)] – [X + 0] = - 161 kJ

Endothermic and Exothermic reactions release or absorb energy, the graph above shows the way in which the chemical energy changes.

An example of a chemical change that one could come into contact with daily is rust. Air and iron are the reactants in this situation while rust is the product. The chemical equation for this reaction would look roughly like this, O+FE= OFE or rust. This is clearly a chemical change because you cannot reverse it meaning you cannot take rust and pull out the iron to leave air or vise versa. All chemical changes are finite. One other example of a chemical change is the burning of any substance. For example if one were to burn a sheet of paper it would create ash. This chemical change is finite because you cannot change ash back into paper.

A chemical reaction is a process in which elements or compounds react with one another to create new or different substances. There are two parts to a reaction. Those two parts are the products and the reactants. The reactants are the chemicals or chemical compounds that are going through the reaction itself. The products are chemical elements or chemical compounds that are produced as a result of the reactant or reactants reacting. There are four key indications that there’s a chemical reaction is taking place. Those four signs include a change in color and/or odor, formation of a precipitate or a gas, the release or absorption of energy (light, heat, electricity), and if the reaction is irreversible. Along with this information, there are ways to predict the products of a reaction.

Chemical reactions are important.Without a freezer coud ylou have nice cold ice cream and without an oven could you have roast chicken or oven fries and the answer is no. Ovens and freezers are very similar as inside heaps of chemicals are reacting to the food so it is either hot or cold.

. There are four reactions that took place in this experiment. The first reaction is a redox reaction. When the Nitric acid was added to the copper wire in the beaker electrons were transferred from copper to nitrogen. The second reaction that took place is the double replacement precipitation reaction. This occurred when NaOH was added. Both the hydroxide and the nitrate ions exchanged and the copper hydroxide ions precipitated forming a solid. When the solution was heated, decomposition took place. The hydroxide ions in the copper hydroxide broke apart and left one oxygen atom which combined with copper to form copper oxide solid. The last reaction was the acid base reaction. This occurred when Sulfuric acid was added, the sulfate

Background: Energy changes occur in all chemical reactions; energy is either absorbed or released. If energy is released in the form of heat, the reaction is called exothermic.