Activation energy is defined as “the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur”. The activation energy depends on the particular reaction, but if the concentration of molecules increases then there is a higher chance of successful collisions, therefore a higher rate of reaction will take place. I predict this will happen because of the ‘collision theory’. Collision theory is the idea that particles must collide for a reaction to happen. A higher concentration means there are more molecules of the substance.
Substances undergoing net diffusion are said to move down or with their concentration gradient. After time (dependant on the substance) the substance will become evenly distributed. This is what’s known as equilibrium, although random kinetic motion continues, there’s no further net diffusion. Certain attributes can affect diffusion, such as heat, this will make diffusion occur more rapidly due to transferring more energy to the molecules to move around faster. Also a larger concentration gradient produces a faster diffusion, and smaller molecules diffuse more rapidly than larger molecules.
Heat flows from the warmer to the cooler object until they are both at the same temperature. Conduction is the movement of heat through a substance by the collision of molecules. At the place where the two object touch, the faster-moving molecules of the warmer object collide with the slower moving molecules of the cooler object. As they collide, the faster molecules give up some of their energy to the slower molecules. The slower molecules gain more thermal energy and collide with other molecules in the cooler object.
Thermal runaway reaction occurs when the heat generated by a reaction goes beyond the heat removal caused by the available cooling capacity. Heat is accumulated leading to a gradual rise in the temperature of the reaction mass; this causes an increase to the rate of reaction and increases the speed of rate of heat generation. [1] Why are thermal runaway reactions dangerous on industrial scale? Thermal runaway reactions are always said to be dangerous on an industrial scale since the reactions go faster in an industry where they tend to reach higher temperatures. As you would already know that exothermic reactions tend to release quite a large amount of heat, so when the reaction mixture gets very warm, a very hot exothermic reaction begins.
Polycythemia is an increase in red blood cells, which would increase the viscosity and decrease flow. ACTIVITY 3 Studying the Effect of Blood Vessel Length on Blood Flow Rate 1. Which is more likely to occur, a change in blood vessel radius or a change in blood vessel length? Explain why. Increase in blood vessel radius is more likely to occur.
Hypothesis With increasing temperature of sodium thiosulphate the reaction rate will increase as well. Justification As the collision theory states for a chemical reaction to occur particles need to collide at a certain speed and angle. Increasing the temperature gives particles more energy, so they move faster. As they move faster more collisions happen, hence more successful collision, which increases the rate of the reaction1. Materials> Hydrochloric acid HCl(l)> Sodium triosulphate Na2S2O3(l)> 250 ml3 beaker> 50 ml3 conical flask> 2 x 25 ml3 measuring cylinder> Thermometer> Stop clock> Tea kettle> Blank card> Pen Variables Reaction time is the dependent variable, as it depends on the temperature of the solution.
Viscosity can be affected by three main factors, Firstly, the higher the temperature, the lower the density of the magma, causing it to flow more easily. Secondly, the greater the amount of dissolved gases in the magma, the less viscous it will be, and lastly the higher the silica content, the more viscous it will be. Thicker, more viscous magma has a greater potential for explosive eruptions and therefore represent the greatest potential hazards. The thickest type of magma is known as Acidic Magma. Its relatively low temperature, high silica content and leads to blockages and powerful eruptions.
Another reason why my pulse rate increased was because my body was getting rid of waste gases which are CO2 and H2O that are products of respiration. My respiration rate increased because I was using up lots of energy and I also was producing more carbon dioxide. Therefore I had to increase my oxygen intake and I also had to get rid of the carbon dioxide more quickly. My blood pressure increased because when my heart was pumping faster the amount of blood that was going through my vessels increased which put a strain on her vessels. My temperature increased because of the high amount of heat I produced.
Expansion, an increase in the volume of a substance, usually due to the addition of heat to the substance. The heat causes the molecules of the substance to move farther apart, making the substance occupy more space. A loss of heat causes the opposite effect, known as contraction. Although most substances expand when heated, not all expand at the same rate. Aluminum, for example, expands twice as much as iron when both are heated the same amount.
Experimental Design Focus question: What is the relationship between strain and time? Hypothesis: The more springs added, the mass will vibrate quicker. The more mass added, the longer it will take to vibrate. Vice versa, the more springs taken away, the longer the mass will take to vibrate. The more mass taken away, the quicker it will vibrate.