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iGCSE Chemistry: Kinetics - test myself

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Draw a diagram to explain that a catalyst provides an alternative pathway with lower activation energy.
Mg + 2HCl → MgCl₂ + H₂ Assume acid is in excess. Sketch a graph showing total gas produced over time. Add a second line showing if double the concentration of acid is used.
Mg + 2HCl → MgCl₂ + H₂ Sketch a graph showing total gas produced over time. Add a second line showing if a lower temperature is used
Mg ribbon and an excess of HCl react to product a gas. Sketch a graph showing the total volume of gas over time. Add a second line for using powdered magnesium.
Calcium carbonate reacts with an excess of hydrochloric acid to produce carbon dioxide. Sketch a graph to show the total volume of gas produced over time. Add a line to show the total volume if half the mass of calcium carbonate is used.
The reaction between magnesium and hydrochloric acid was used to measure the rate of reaction at different temperatures. Name 4 things which should be kept constant.
Temperature of acid. Volume of acid. Concentration of acid. Mass of magnesium. Surface area of magnesium.
On a graph showing gas produced (verticle axis) over time (horizontal axis), how does the line tell us the rate of reaction?
The steeper the line, the faster the rate of reaction
State 5 ways in which the rate of reaction could be increased
Increase surface area (solids), increase temperature, increase concentration (solutions), increase pressure (gases), add an appropriate catalyst
What happens to the rate of reaction if a catalyst is added?
Rate of reaction increases
What happens to the rate of reaction if the concentration of solutions is INCREASED?
Rate of reaction increases
What happens to the rate of reaction if the pressure of gases is INCREASED?
Rate of reaction increases
What happens to the rate of reaction if the surface area of a solid is INCREASED?
Rate of reaction increases
What happens to the rate of reaction if the temperature is INCREASED?
Rate of reaction increases dramatically
What simple change could be made to a reaction to speed it up dramatically?
Heat it up
Explain the effects of increasing the concentration of solutions on the rate of a reaction in terms of particle collision theory
1) more particles in same space 2) more frequent collisions 3) increase rate of reaction
Explain the effects of increasing the pressure of gases on the rate of a reaction in terms of particle collision theory
1) more particles in same space 2) more frequent collisions 3) increase rate of reaction
Explain the effects of increasing the surface area of a solid on the rate of a reaction in terms of particle collision theory
1) more particles exposed 2) more frequent collisions 3) increase rate of reaction
Explain the effects of increasing the temperature on the rate of a reaction in terms of particle collision theory
1) particles have more kinetic energy 2) more frequent collisions 3) and a higher proportion of the collisions which occur have greater or equal to the activitation energy 4) increase rate of reaction
What is a catalyst?
A substance that speeds up a chemical reaction but is chemically unchanged at the end of the reaction
What type of substance speeds up a chemical reaction but is chemically unchanged at the end of the reaction?
Catalyst
Explain how a catalyst works
A catalyst provides an alternative pathway with lower activation energy
(Triple only) What happens if two particles collide with less than the activation energy
No reaction
(Triple only) What is meant by the term activation energy?
The minimum energy that the particles in collision must have if a reaction is going to occur
(Triple only) With how much energy must two particles collide for a reaction to occur?
The particles must collide with an energy greater or equal to the activation energy
Give a simple reaction can be used to investigate the effect of changing concentration on the rate of reaction
Marble chips added to hydrochloric acid of various concentrations
Give a simple reaction can be used to investigate the effect of changing surface area on the rate of reaction
hydrochloric acid added to either marble chips of powdered caclium carbonate
Describe the laboratory preparation of oxygen from hydrogen peroxide
Hydrogen peroxide is added to a flask containing a catalyst of manganese oxide, MnO₂. Oxygen is produced and is collected underwater.
State the catalyst used for making oxygen through the decomposition of hydrogen peroxide
manganese(IV) oxide, MnO₂
What reactant is used to produce a sample of oxygen in the lab?
hydrogen peroxide
Write the chemical equation for the decompostion of hydrogen peroxide, H₂O₂
2H₂0₂ → 2H₂0 + O₂
Write the word equation for the decompostion of hydrogen peroxide, H₂O₂
hydrogen peroxide → water + oxygen
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