Reaction rate Essays

The R2 value is close to 1 which means the data is reliable and accurate. The data for 28.0°C is the furthest away from the line of best fit probably because either the temperature or time was not measured properly.

Rate of reaction is a term used to measure the time or speed that the reaction occurs in. A rate of reaction can be effected by different factors, such as the concentration, temperature, whether or not a catalyst is involved, the state that the reactants were in at the time of the experiment and the amount of pressure that was involved in the experiment. If the concentration, temperature and the amount of pressure involved were higher than the rate of reaction would be higher. Those factors would affect the speed and the amount the atoms are moving at therefore effecting the amount that the particles collide and hence impacting the rate of reaction.

Cut 9 equal sizes (3 cm) pieces of Magnesium from the cleaned Magnesium ribbon, weigh each of them using a digital weighing balance and record weights.

The experiment is to investigate the effect of the change in the concentration of Hydrogen peroxide and sodium thiosulphate on the rate of reaction between potassium iodide (KI), hydrogen peroxide, Sodium thiosulfate (Na2S2O4) under acidic condition.

This experiment is designed to help in estimating the activation energy of the rate-limiting step in the acid catalyzed reaction of acetone with iodine. This is achieved by measuring the reaction rates at different reaction temperatures over the experiment. Once the raw data is obtained, I will analyze the data with the help of an Arrhenius plot. This is a tool used in determining the activation energy of chemical reactions. Here, the natural logarithm of the rate of reaction

I will be combining calcium carbonate with hydrochloric acid as a case study to measure the rate of chemical reaction.

Increasing the concentration of reactants in solutions increases the frequency of collisions between particles and so increases the rate of reaction

Research Question: How does increasing the concentration (1%, 3%, 5%) of amylase from the pancreas affect the rate of the breakdown of starch solution, measured by the time taken for the starch to turn into simple sugars using a stopwatch (0.01s)

Arrhenius equation is a mathematical expression which illustrates the effect of temperature on the rate of a chemical reaction and is used to calculate reaction-rate constants\cite{logan}. In the equation, we have $k$ as the reaction-rate constant, R as the thermodynamic gas constant, A as the pre-exponential factor, E$_a$ as the activation energy and finally $T$ as the absolute temperature. Generally, the equation is represented in exponential form:

Enzymes are needed for survival in any living system and they control cellular reactions. Enzymes speed up chemical reactions by lowering the energy needed for molecules to begin reacting with each other. They do this by forming an enzyme-substrate complex that reduces energy that is required for a specific reaction to occur. Enzymes determine their functions by their shape and structure. Enzymes are made of amino acids, it 's made of anywhere from a hundred to a million amino acids, each they are bonded to other chemical bonds. The enzymeʼs have an active site that allows only certain substances to bind, they do this by having an enzyme and substrate that fit together perfectly. If the enzyme shape is changed then the binding

Enzymes are globular proteins folded into a complex 3-dimensional shape that contain a special surface region called the active site where specific substrate can bind structurally and chemically. They act as catalysts, meaning that they are substances which lower the activation energy required for a chemical reaction to occur and therefore increases the rate of the reaction. Activation Energy is the minimum energy barrier needed to be overcome before a reaction can occur by providing an alternative reaction pathway.

The concentration of the Amylase was kept at 1% at at times throughout the experiment.

Kinetics is the study of the rates of chemical reactions. A reaction rate describes the reaction’s speed, it is the rate at which the starting materials of a reaction (reactants) react and transform into the final produced materials (products). The greater the reaction rate, the less time required for reactants to be converted to products. Understanding the factors and conditions influencing reaction rates of is of fundamental importance in industrial chemistry where the production of chemicals must be efficient and economical to maximise profits.

In this lab I will be exploring how temperature impacts the rate of osmosis by placing pieces of potato of equal size in solutions of different temperatures and observing the change in mass of potato after a given period of time. The change in mass will indicate the rate of osmosis.

What is the effect of surface area on rates of reaction, when magnesium is combined with hydrochloric acid to create hydrogen?

Therefore the aim of this experiment is to investigate the effect of increasing temperature on the activity of the enzyme catalyst.

Enzymes are biological catalysts that increase the rate of a reaction without being chemically changed. Enzymes are globular proteins that contain an active site. A specific substrate binds to the active site of the enzyme chemically and structurally (4). Enzymes also increase the rate of a reaction by decreasing the activation energy for that reaction which is the minimum energy required for the reaction to take place (3). Multiple factors affect the activity of an enzyme (1). These factors include the pH and the temperature of the solution (1). Most enzymes have a preferred temperature and pH range (2). The preferred temperature for catalase falls between the ranges of thirty five to fifty degrees Celsius (4). Temperatures that are too high denature the enzyme and halt the enzyme’s activity (2). Catalase denatures starts to denature at fifty five degrees Celsius (2). Reactions in the human body produce hydrogen peroxide as a product (1). Since hydrogen peroxide is poisonous to the human body, catalase catalyzes hydrogen peroxide into water and oxygen (2 H2O2 → 2 H2O + O2) (1). According to the collision theory, a reaction can only occur if particles collide with sufficient energy to overcome the activation energy and with correct geometrical orientation (3). Increasing temperature increases the kinetic energy of the particles which means that an increase in temperature will increase the speed of the hydrogen peroxide and the catalase molecules which

Enzymes are giant molecular biological catalyst.They are responsible for thousands of metabolic processes that systain life.Enzymes are highly selective greatly accelerating both the rate and specificity of of metabolic reactions from the digestion of food to the synthesis of DNA..Most enzymes are proteins.They possesses a three-dimensional structure.

How does the amount of baking soda mixed with vinegar affect the volume of gas produced per 10 seconds?

To investigate the redox catalytic activities of the synthesized AuNPs using the olibanum gum, we selected a well-known catalytic reaction the transformation of 4-NP to 4-AP by sodium borohydride (NaBH4) as a model reaction and the reaction was monitored using UV–visible spectroscopy. The absorption peak of 4-NP undergo red shift from 317 nm to 400 nm immediately after addition of NaBH4, corresponding change in the colour of the solution from yellow to intense yellow was observed due to the formation of 4-nitrophenolate ions under alkaline conditions. This peak at 400nm remained unaltered for many days in the absence of AuNPs. This indicates the inability of NaBH4 itself to reduce directly