Chemical Reactions

10. A pH scale describes the degree of acidity or alkalinity of a substance. 0 to 6.9 indicates an acidic solution, 7.1 to 14 indicates an alkaline solution, and 7 indicates a neutral solution.

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?

One type of chemical reaction, called combustion, involves the burning of various compounds and elements. Some substances are more

This is a simple equation that doesn’t properly prove the reaction. It is very complex and starts with this:

A chemical reaction is a process that involves change of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction. The key concepts of a chemical reaction are:

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

Jack Zhou Eric Lonrenzo Chemistry section # Date Chemical Reactions Introduction: The purpose of the lab was to create and observe the 4 kinds of chemical equation, and to identify reactants and products of those reactions.

Introduction During this unit, we learned about 5 types of chemical reactions. They consist of Synthesis, Decomposition, Single Displacement, Double Displacement, and Combustion. A synthesis reaction or direct combination reaction is one of the most common types of chemical reactions. In a synthesis reaction, two or more chemical species combine to form a more complex product. A + B → AB.

Chemical reactions make new things by rearranging other things. In a chemical reaction, the main change that occurs relates to the way atoms are bonded to each other, in order to change those connections, bonds must be broken and new bonds be formed.

When studying chemisty, you must grasp how reactions can form acids or bases, as well as what effect that has on pH. A basic understanding of chemistry is important in biology, because living things are composed of matter.

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 weathering occurs when a rock or building material is eroded and/or disintegrated by a chemical process. This will occur primarily when a water is mixed with a chemical. Chemical weathering will also often occur by water and in areas where warmer water or temperatures more frequently occur and are common (kidsgeo), as the process accelerates and thrives in these conditions. Often this process will occur in warmer seasons in the summer or spring to take advantage of the warmer weather in order to accelerate the process. There are three distinct types of chemical weathering that can occur: oxidation, hydrolysis, and carbonation. Oxidation will occur when a molecule will gain an extra oxygen molecule. A good example of this is rust (passel), which occurs when iron reacts with oxygen and it becomes iron oxide. So when a rock goes oxidised is becomes weaker and can break down easily as the extra oxygen has weakened its structure . Hydrolysis will occur when an extra water molecule is added. And carbonation will occur when water reacts with carbon dioxide to form a carbonic acid, which can hollow out rocks by breaking them down, leading to cave formations.

Anytime you use your five senses such as seeing, hearing, smelling, touching and tasteing involves chemicals and chemistry. They all involve chemical reactions and interactions in a person’s body. Although, with a larger range of topics, it’s important to know about chemistry