Eight Chemical Reactions

When we bake/cook something, we use a specific amount of each ingredient. Imagine if you made a batch of cookies and used way too many eggs, or not enough sugar. YUCK! In chemistry, reactions proceed with very specific recipes. The study of these recipes is stoichiometry. When the reactants are present in the correct amounts, the reaction will produce products. What happens if there are more or less of some of the reactants present?

For example, the combination of iron and sulfur to form iron (II) sulfide: 8 Fe + S8 → 8 FeS (Helmenstine, 2016) In Chemistry, Catalyst is certain substance that can increase reaction rate but not consume themselves in reaction. (“Catalyst,” 2009) Material and Methods: See text activities 5B pp.208-209(Dickinson, et. al., 2009)

This type of reaction is an oxidation-reduction (or redox) reaction. This reaction is also [anabolic/catabolic] and [endergonic/exergonic].

When the two smaller reactants join together, water is produced and removed during the synthesis of the larger molecule. This is also called Dehydration Synthesis.

Reactants collide with each other so new bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make new products

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

What is the appearance of reactant, Evidence of chemical reaction, and properties of a product?

Lab Title: Synthesis, Decomposition, Single Displacement and Double Replacement Chemical Reactions Purpose: The objective of lab four was to use the website Late Nite Labs to determine types of chemical reactions. Combining and/or heating various compounds, observing the reactions and balancing equations for the chemicals involved, reveals the chemical reactions. Materials: A computer, Internet, calculator and access to Late Nite Labs.

Single replacement reaction is when a cation replaces another cation in a pair. The reactants in a single-replacement are made up of one element and one compound. The zinc takes the place of the hydrogen and forms a product known as zinc chloride and hydrogen, where the hydrogen is left on its own. The hydrochloric acid is clear and the zinc is a small metal clump. After the reaction, zinc was still reusable and it produced a gas. One can predict that single replacement will occur because there is one element on its own.

The difference between endothermic and exothermic reactions is that endothermic reactions absorb heat, and exothermic give off heat. Dilution of ammonium chloride is an example of an endothermic reaction. This is the active ingredient in chemical ice packs you can obtain in a pharmacy. Other reactions are melting and boiling which also absorb heat to happen, although you may not consider them chemical reactions. Combustion is a typical exothermic reaction any type of burning.An exothermic reaction occurs if the energy of the bonds formed in the products

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?

This is a single replacement reaction. A single replacement reaction involves one element replacing another element in a compound. This type of reaction can be written as:

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 that release energy are called exothermic reactions, these reactions are observed by an increase in temperature of the reaction mixture.

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.