Gas is one of three states of matter. The gas state is composed of a group of molecules that move freely, independent of each other. There are certain properties that define gas and separate the state of matter from the other two states: solid and liquid. Many different energies, forces, and amounts greatly affect the behavior of any type of gas. These differences consist of pressure, temperature, volume and even the number of molecules of a gaseous element. There is a mathematical relationship between all of these properties that affect all the properties when only one is changed. The theories that explain this ratio between properties are known as the Boyle and Charles Laws. The Kinetic Molecular Theory, which clarifies how kinetic energy creates the motion of gas molecules, is one of the leading theories on gases. And finally, the ideal gas law, which explains how much of a gas is used in a chemical reaction. The ideal gas law calculates the ratio of all elements within a chemical reaction and allows the amounts of gas or gases that will be used in the reaction, usually expressed in the form of a linear equation, to be discovered.
Gases have certain properties that define them and set them apart from the other two states of matter. The atoms of a gas are usually at a distance from each other and are not affected by the existence of other molecules nearby. They are neither attracted nor repelled by other gas particles. The molecules are constantly moving at extremely fast speeds and do not curve in the path that they are moving in. When the gas molecules collide, they do not stick to each other; however they will simply bounce off of one another and continue in a new path. When gases are placed in any sort of cont...
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... of gas particles and molecules, which help define the gas. If there is more volume in a container, then the gas will spread out to fill the full size of the container. All of the properties of gases add some complication to the subject, and many formulas, laws, theories, and hypotheses allow any unknown information on the gas to be discovered, including laws such as Boyle’s Law, which compares pressure to volume, Charles’s Law, which compares temperature to volume, and Avogadro’s Hypothesis, which compares volume to the amount of gas. The Kinetic Molecular Theory is the theory on how the movement of the molecules work, and how they are powered has been created and improved throughout history, up to the twentieth century. The ideal gas law is the connector to the chemical reaction part of gases. Essentially, gases are full of equations, concepts, and properties
The Gravimetric Stoichiometry lab was a two-week lab in which we tested one of the fundamental laws of chemistry; the Law of Conservation of Mass. The law states that in chemical reactions, when you start with a set amount of reactant, the product should theoretically have the same mass. This can be hard sometimes because in certain reactions, gases are released and it’s hard to measure the mass of a gas. Some common gases released in chemical reactions include hydrogen, carbon dioxide, oxygen and water vapor.
The general chemical characteristic of gas equilibriums is when the concentrations of reactants and products do not change with time. This is known as the state of reversible reaction. At this state, pressure, density, colour and concentration can be recognised. At equilibrium, both the forward and backward reactions are still continuing because the rates of the forward and backward reactions are equal. This leads to the general physical characteristic of gas equilibriums which is the concentration of each substances become constant and the system is said to be at dynamic equilibrium. The equilibrium can be established in physical equilibrium and in chemical equilibrium.
Matter exists in three basic states: solid, liquid, or gas. A substance experiences a phase change when the physical characteristics of that substance change from one state to another state. Perhaps the most recognizable examples of phase changes are those changes from a solid to a liquid or a liquid to a gas. When a substance goes through a phase change, there is a change in the internal energy of the substance but not the temperature of the substance (Serway, et al. 611).
Hess’s Law is also an important concept in this lab. It states that the enthalpy of a reaction is independent of the steps it takes to go from reactant to a product. It happens because enthalpy is a state function. A state function depends on the initial and final state but not the actual process. The Hess’s Law is used to calculate the heat formation of Magnesium Oxide. The amount of heat necessary to create one more mole of a substance is called the Enthalpy of Formation.
In 1803 this theory was finalised and stated that (1) all matter is made up of the smallest possible particles termed atoms, (2) atoms of a given element have unique characteristics and weight, and (3) three types of atoms exist: simple (elements), compound (simple molecules), and complex (complex molecules).
5. In a gas increasing the pressure means molecules are more squashed up together, so there will be more collisions. My Investigation. I am going to investigate the concentration variable. I have chosen this because in my opinion it will be the easiest one to measure.
Genetics relies on chemistry to explain phenomena related to the field. The structure of DNA relies on chemistry. In fact, when James Watson and Francis Crick discovered the structure of DNA, they did so by building models based on the laws of chemistry. Chemistry also relates heavily to the structure and function of one of the main products of DNA: protein.
The zeroth law of thermodynamics states that “when two systems are each in thermal equilibrium with a third system, the first two systems are in thermal equilibrium with each other.” (Drake P.1). The first law of thermodynamics states that the change in internal energy of a system is equivalent to the total work done by the system subtracted from the total heat transfer into the system. This law is represented by the equation The variable represents the change in internal energy of the system, represents the total heat transferred into the system, and represents the total work done by the system. The second law states that heat flows spontaneously from hotter to colder regions but never in the reverse direction. It also states that the total entropy can never decrease over time for an isolated system; it will always increase over time. Additionally, the changes in entropy in the universe can never be negative. The third law states that “the entropy of a perfect crystal of an element in its most stable form tends to zero as the temperature approaches absolute zero.” (Drake P.1). Thermodynamics developed quickly throughout the 19th century because of the need to improve steam engines and how they worked. The thermodynamics laws can be applied to “all physical and biological systems” (Drake P.1). These laws of thermodynamics are able to give people an explanation about a variety of changes in the energy of a system, along with its
The Equation Of State These three gas laws that were proposed by Boyle, Amontons and Charles can be summarised as follows: For a fixed mass of gas pV = constant if T = constant (i) p/T = constant if V = constant (ii) V/T = constant if p = constant (iii)
The best way to measure gasses is by creating a closed system for an experiment
Rowlinson, J.S. “James Joule, William Thomson and the Concept of a Perfect Gas.” The Royal
Since the days of Aristotle, all substances have been classified into one of three physical states. A substance having a fixed volume and shape is a solid. A substance, which has a fixed volume but not a fixed shape, is a liquid; liquids assume the shape of their container but do not necessarily fill it. A substance having neither a fixed shape nor a fixed volume is a gas; gases assume both the shape and the volume of their container. The structures of gases, and their behavior, are simpler than the structures and behavior of the two condensed phases, the solids and the liquids
Thermodynamics is the branch of science concerned with the nature of heat and its conversion to any form of energy. In thermodynamics, both the thermodynamic system and its environment are considered. A thermodynamic system, in general, is defined by its volume, pressure, temperature, and chemical make-up. In general, the environment will contain heat sources with unlimited heat capacity allowing it to give and receive heat without changing its temperature. Whenever the conditions change, the thermodynamic system will respond by changing its state; the temperature, volume, pressure, or chemical make-up will adjust accordingly in order to reach its original state of equilibrium. There are three laws of thermodynamics in which the changing system can follow in order to return to equilibrium.
Gases are also very low in density. The average gas is 1000 times less than that of the average liquid. The volume of gas varies with many things including temperature and pressure. These are explained in Charles's and Boyle's laws.