Chemical reaction

The purpose of this lab was to determine if a change in mass occurs during a chemical reaction in a closed system. To conduct this experiment, the mass of the test tube, rubber cover, and other materials must be measured. To prevent the test tube from rolling off of the balance, a plastic cup was used to hold it in place, but the group had to remember to zero out the cup on the balance so the cup’s mass will not affect the masses of the objects the group was trying to measure. During this…

specific substrates to achieve an highly effective catalyst reaction. .Almost all cellular activities of enzymes involved in the process are required to improve efficiency. Similar to other non-biological catalysts，enzymes provides another reaction route requires lower activation energy (Ea) to increase the number of particles that have a kinetic energy of not less than the activation energy, thus speeding The reaction rate. Most of the reaction rate can be improved hundreds of times by…

The temperature in the room may have altered. A dependent variable is a variable you do not change during an experiment. Instead, it changes as a result of other changes you make. The dependent variables in my experiment were: • The rate of reaction. • The volume of sodium thiosulphate. The volume of sodium thiosulphate will remain unaffected throughout the whole experiment, Where as I will be changing the concentrations of hydrochloric acid. The volume of sodium thiosulphate will…

An enzyme is a biological catalyst; they accelerate most reactions within cells (Cooper, 2000). Enzymes have three constitutional characteristics: they assist chemical reactions without becoming exhausted or altered themselves, they do not change the balance between the reactants and products and they are highly specific as to what reactions they are able to catalyse (Cooper, 2000). The active sites of enzymes are where chemical reactions occur. The active sites are dimples or grooves in the…

potentially get any worse. How the contents of instant cold packs help them work. 2. Instant hot and cold packs work by using chemicals that wither absorb a lot of heat quickly or release heat when absorbed in water, when a process absorbs a lot of heat it’s called an endothermic reaction ; when a process releases a lot of heat it’s called an exothermic reaction, the chemical ammonium nitrate Is quite often used in cold packs because it absorbs a lot of heat when soaked in water, water and…

BALANCING REDOX EQUATIONS 1) Assign the Oxidation Numbers The Oxidation Number (ON) of an element is its charge. It is the number of electrons an element contains. This would be our basis on whether the element gained or lost electrons in chemical reactions. We can say that an element is in its Oxidation State when the element already has a specific ON. Unlike with our previous examples, not all equations would already reveal the ON of each element. In actuality, equations would only be…

oxidation-reduction reaction or redox reaction. Oxidation is also the gain of oxygen and loss of hydrogen while reduction is the loss of oxygen and gain of hydrogen. Redox reactions occur in everyday life, it is a highly significant form of chemical reaction. Examples of real life redox reactions include: combustion, metabolism of food, biological processes as well as the rusting of iron. Combustion- The burning of a substance causes it to react with oxygen in the air. Redox reactions occur…

Martha Garcia November 10, 2017 Chemical Weathering Background Chemical Weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts. It occurs in almost all types of rocks, smaller rocks are susceptible, because they have greater surface area, more common where water is, because water is important to many of the chemical reactions, when water is slightly acidic, which is called ocean acidification. Ocean acidification is…

The purpose of the experiment is to perform a series of chemical reactions involving copper. The goal is then to perform precipitation, acid-base, decomposition, and redox reactions using the copper cycle. The mass of the copper was then analyzed using the percent recovery formula. Reaction 1: The Formation of Cu(NO3)2: Reaction 1 of the experiment involved performing a redox reaction to create Cu(NO3)2. Immediately after HNO3 was added to the copper wire (Cu), the brown NO2 gas was emitted from…

Introduction/Purpose: Chemicals all perform different reactions when dissolving into different chemicals, and in the lab “Our First Lab” my group and I observed one of these chemical reactions. The purpose of the lab was to witness the chemistry behind these reactions in action, so we could put research and observations together on how it was possible for something to illuminate with only a forced bend to it. Observed how each light sticks glow depended on the temperature they were exposed to,…