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.
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.
The second one could have iron +2 and copper +2. The third one could have used iron +3 and copper +1 and the last one could have iron +3 and copper +2 There are several factors that can influence the rate of a chemical reaction. In general, a factor that increases the number of collisions between particles will increase the reaction rate and a factor that decreases the number of collisions between particles will decrease the chemical reaction rate. The factors that can influence the rate of a chemical reaction are: the concentration of reactants, the temperature, the medium and the presence of catalyst and competitors. The higher the concentration of reactants is, the higher the rate of a chemical reaction is.
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.
As a reverse DC voltage is applied across the diode, its capacitance varies. The higher the voltage, the less the capacitance. This is due to depletion layers of the diode junction, but we wont get into details here. This variable capacitor in conjunction with the stub, which is actually an inductor (coil) is the basis of our voltage controlled oscillator! As the voltage increases across D5, the frequency of oscillation increases.
Which type of compound usually has higher melting points: ionic compounds or covalent compounds? What is the reason for this difference in melting points? (3 points) - Ionic compounds have higher melting and boiling points than covalent compounds. The electrostatic attraction in an ionic bond is very strong hence a lot of heat energy is required to break it down, ionic bonds have high melting and boiling points. However, in covalent bonds, the intermolecular forces are very weak and easily broken, hence lesser heat is required and thus covalent bonds have lower melting and boiling points.
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.
The more electrical energy added, the hotter the plasma arc becomes. Plasma arc cutting machines control this powerful energy by constricting the arc and forcing it through a concentrated area (the nozzle). By increasing air pressure and intensifying the arc with higher amperage, the arc becomes hotter and more capable of blasting through thicker metals and blowing away the cuttings, with minimal cleanup required. 3.1 BACKGROUNDS AND THEORY Plasma is defined as a gas which has been heated to an extremely high temperature and ionized so that it becomes electrically conductive. The plasma arc cutting and gouging processes use this plasma to transfer an electric arc to the workpiece.
3. Why does a nerve’s action potential increase slightly when you add 1.0 V to the threshold voltage and stimulate the nerve? (6 points) The action potential increases because the nerve consists of more than one neuron, when you increase the voltage it increases the number of neurons that are stimulated causing depolarization of most of the neurons 4. If you were to spend a lot of time studying nerve physiology in the laboratory, what type of stimulus would you use, and why? (6 points) I would use chemical stimulation.
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.