Why sawdust burns more quickly than a block of wood of equal mass under the same conditions?
The molecules move more quickly in the sawdust than in the block of wood. The pressure of oxygen is greater on the sawdust. More molecules in the sawdust can collide with oxygen molecules. Oxygen is more concentrated near the sawdust than the block of wood.
Which describes a way to speed up the collisions between hydrogen and oxygen molecules to produce more water?
Which describes a way to speed up the collisions between hydrogen and oxygen molecules to produce more water? Use a less-intense source of heat on the reactants.
Why does a higher temperature increase the rate of a reaction?
An increase in temperature causes a rise in the energy levels of the molecules involved in the reaction so the rate of the reaction increases. Similarly the rate of reaction will decrease with a decrease in temperature.
In which factor will affect the rate of reaction only when gases are involved?
TEMPERATURE IS YOUR ANSWER.
Which change would likely cause the greatest increase in the rate of reaction?
Usually an increase in temperature causes an increase in the reaction rate. A higher temperature means that the molecules have a higher average kinetic energy and more collisions per unit time. It also increases the number of collisions that have enough energy to cause a reaction to take place.
Which of these factors will cause an increase in the rate of reaction quizlet?
Increasing the temperature increases the rate of reaction because the particles collide more often and with more energy. The higher the temperature the faster the rate of a reaction will be. If the concentration of reactants is increased there are more reactant particles moving together.
Which describes a way to speed up the collisions between calcium hydroxide and carbon dioxide?
Which describes a way to speed up the collisions between calcium hydroxide and carbon dioxide molecules to produce calcium carbonate faster? Reduce the volume of the container. How does an increase in reactant concentration affect the rate of reaction? It leads to more frequent collisions which increase reaction rate.
What explanation below best describes why increasing concentration increases the rate?
When the concentrations of reactant molecules are increased the rate of reaction increases. The best explanation for this phenomenon is that as the reactant concentration increases – the average kinetic energy of molecules increases. – the frequency of molecular collisions increases.
Which applies to the collision theory particles need to collide in order to react?
Collision theory states that for a chemical reaction to occur the reacting particles must collide with one another. … For collisions to be successful reacting particles must (1) collide with (2) sufficient energy and (3) with the proper orientation.
How does increasing temperature affect the rate of diffusion?
The higher the temperature the more kinetic energy the particles will have so they will move and mix more quickly. The greater the surface area the faster the rate of diffusion.
Why does increasing the concentration increase the rate of reaction?
If the concentration of reactants is increased there are more reactant particles moving together. There will be more collisions and so the reaction rate is increased. The higher the concentration of reactants the faster the rate of a reaction will be.
How does temperature affect heat of reaction?
An increase in the temperature of a system favors the direction of the reaction that absorbs heat the endothermic direction. Absorption of heat in this case is a relief of the stress provided by the temperature increase. For the Haber-Bosch process an increase in temperature favors the reverse reaction.
What factors affect the rate of reaction?
What affects the rate of reaction?
Which factors would decrease the rate of a reaction?
Decreasing the temperature of the reactants causes the molecules to move slower which creates low energy collisions and decreases the rate of the chemical reaction. Extra ingredients added to the reactants to speed up the reaction. Extra ingredients added to the reactants to slow down the reaction.
Why does a lower concentration of dissolved particles increase the reaction rate?
When more particles are present in a given amount of space a greater number of collisions will naturally occur between those particles. Since the rate of a reaction is dependent on the number of collisions occurring between reactants the rate increases as the concentration increases.
How does an increase in reactant concentration affect the rate of reaction quizlet?
A high concentration has more reactant particles per unit volume available to collide. … As it exposes more reactant particles to the reaction it increases the frequency of collisions which increases the frequency of effective collisions resulting in a faster reaction rate.
How does an increase in reactant concentration affect the rate of reaction?
With an increase in temperature there is an increase in the number of collisions. Increasing the concentration of a reactant increases the frequency of collisions between reactants and will therefore increase the reaction rate.
Why does an increase in temperature result in an increase in reaction rate quizlet?
How does increasing the temperature affect the rate of reaction? By increasing temperature reactants have more kinetic energy and move faster making them collide more often. By increasing number of collisions number of reactions is increased and so reaction rate increases.
Which statement best describes the use of catalytic converters in automobiles quizlet?
Which statement best describes the use of catalytic converters in automobiles? They oxidize hydrocarbons to form less toxic gases. You just studied 10 terms!
Which statement best describes the relationship between activation energy and rate of reaction quizlet unit test?
Which statement best describes the relationship between activation energy and rate of reaction? Increasing the activation energy can increase the rate of a reaction.
What is the main reason it takes 2 to 3 minutes for the reaction to occur between sucrose and sulfuric acid in the dehydration of sucrose?
What is the main reason that it takes 2 to 3 minutes for the reaction to occur between sucrose and sulfuric acid in the dehydration of sucrose? The activation energy needs to be overcome in the reaction.
How do the results show that increasing the concentration of acid increases the rate of reaction?
As you can see the greater the concentration of the acid used in a reaction the steeper the curve and the shorter the reaction time. Hence these results show that an increase in concentration increases the rate of a reaction. At low temperatures the reacting particles have less energy.
How does concentration affect the rate of reaction experiment?
Increasing the concentration of reactants generally increases the rate of reaction because more of the reacting molecules or ions are present to form the reaction products. … When concentrations are already high a limit is often reached where increasing the concentration has little effect on the rate of reaction.
How does collision theory explain the effect of concentration on reaction rate?
Collision theory explains why most reaction rates increase as concentrations increase. With an increase in the concentration of any reacting substance the chances for collisions between molecules are increased because there are more molecules per unit of volume.
What are the two requirements of collision theory that allow reactants to form products?
Molecules must collide with sufficient energy known as the activation energy so that chemical bonds can break. Molecules must collide with the proper orientation. A collision that meets these two criteria and that results in a chemical reaction is known as a successful collision or an effective collision.
What does the collision theory state?
collision theory theory used to predict the rates of chemical reactions particularly for gases. The collision theory is based on the assumption that for a reaction to occur it is necessary for the reacting species (atoms or molecules) to come together or collide with one another.
What is role of orientation in collision theory?
The orientation of the colliding molecules partially determines whether a reaction between the two molecules will occur. If the collision does take place with the correct orientation there is still no guarantee that the reaction will proceed to form carbon dioxide.
How do the particles move in diffusion?
Diffusion occurs when particles spread. They move from a region where they are in high concentration to a region where they are in low concentration. … Particles diffuse down a concentration gradient from an area of high concentration to an area of low concentration.
What happens to particles when they are heated?
With an increase in temperature the particles move faster as they gain kinetic energy resulting in increased collision rates and an increased rate of diffusion. … With an increase in temperature the particles gain kinetic energy and vibrate faster and more strongly.
How does the steepness of the concentration gradient affect the rate of diffusion?
How does the steepness of the concentration gradient affect diffusion? The greater the difference in concentration between the two sides o the membrane the higher the rate of diffusion.
What aspect of a reaction do they lower thereby increasing the reaction rate dramatically?
The energy required to initiate a chemical reaction. Enzymes lower the activation energy of a reaction thereby greatly speeding up the rate of the reaction.
How does concentration and pressure affect the rate of reaction?
How does particle size affect the rate of reaction?
Breaking the reactant into smaller pieces increases the surface and more particles are exposed to the reaction mixture. This results in an increased frequency of collisions and therefore a faster rate of reaction.
GCSE Physics – Particle Theory & States of Matter #25
Evidence of Plate Movements
Evidence for particles
Model to demonstrate “Movement of Particles”