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# GCSE: Patterns of Behaviour

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1. ## Rates of reaction between hydrochloric acid and magnesium

3 star(s)

Therefore more reactant particles will have enough energy to react. Consequently the number of successful collisions increases. Concentration When increasing the concentration of reactants, the rate of reaction rises. If there are more particles in the same space of volume, the rate of successful collisions increases. The rate of reaction will change as the reaction progresses. When the reactants are used up during the reaction, the concentration of reactants decreases. Meaning particles collide less frequently and the reaction rate decreases. Exothermic and Endothermic These are reactions that transfer energy to the surroundings. The energy is usually transferred as heat energy, causing the reaction mixture and its surroundings to become hotter.

• Word count: 2649
2. ## The effect of concentration on the rate of reaction of Magnesium with Sulphuric Acid.

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Activation energy is the minimum energy required before a reaction can occur. There are several factors that can increase or decrease the chance of a successful collision. The factors that affect the rate of the reaction are; * Temperature - when we increase the temperature, we give the particles energy, which makes the particles move faster. Therefore the particles collide more and they are more likely to have the correct activation energy. The greater the temperature, the faster the rate of a reaction. * Surface Area - when we increase the surface area of the reactants we increase the number of particles available for a successful collision.

• Word count: 2191
3. ## Reaction Rates Investigation

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3 strips, 1cm each and 1 strip at 3cm. Here is a diagram for the most suitable method to use the apparatus we considered. We chose this method because in my opinion it is quicker to set up leaving more time for our actual experiment as we had limited time to complete it. The other apparatus involved a Burette in a clamp stand which was in my opinion just as effective as the more simple method of an upturned measuring cylinder which was a simple process to set up.

• Word count: 2984
4. ## Rates of Reaction

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Apparatus/ Materials: * 20ml of 0.5M HCl * 20ml of 1M HCl * 20ml of 2M HCl * 20ml of 3M HCl * 20ml of 6M HCl * 10g of Calcium Carbonate Powder * 1 Gas syringe * 5 200ml beaker * 1 25ml measuring cylinder * 1 rubber band Method: 1. Measure five 2g CaCO3 powder separately in five different 200ml beakers. (recommended to weigh with a scale (g)) 2. Measure a 20ml of HCl (with a measuring cylinder and use a pipette for small modifications)

• Word count: 2546
5. ## Lab report rates of reaction

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0.5 mole. If this is obstructed then concentration will play its part in the rate of reaction. Note: We should try our best to keep factors that affect the rates of reaction constant. For example temperature and pressure and concentration. This is because if they are differed they would hugely impact our results as they serve as catalysts to the reaction. So we should make sure temperature is constant, The same sizes fo flasks and bongs are used (so pressure is constant) and lastly we should make sure the concentration of the acids are left at 0.5 moles.

• Word count: 2182
6. ## The effects of concentration on reaction rates

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area where there aren't hydrogen or chlorine atoms, so the collision rate is likely to be higher. Prediction: I predict that the higher the concentration of HCl, the faster the reaction will take place. As I said in the introduction, the atoms will find it easier to react (collide) with the magnesium, as there would be more atoms to react with it. I think that the graph I will draw from these results will show proportionalities between the concentrations of the acid, and the time taken to react. However, the table wont show proportionalities, because it won't take into account the different differences between each concentration.

• Word count: 2300
7. ## My experiment will be conducted to find out at what concentration does sodium thiosulphate with hydrochloric acid have the most reaction and how the concentration generally affects the rate of reaction.

4 star(s)

Measure temperature of room 4) Put a bold 'X' beneath the THIO beaker then pour HCL and press 'GO' on the stopwatch. 5) Press 'STOP' when solution goes cloudy and 'x' disappears. 6) Record results 7) See if it takes longer for the dilute solution to react. 8) Spot trends. Initial Method Na2S2O3 (aq) + 2HCl (aq) SO 2 aq) + S(s) + H2O(l) + 2NaCl (aq) My prediction: when the concentration of sodium thiosulphate is increased, the time taken for the reaction to take place will also decrease because the water molecules would delay the collisions between sodium thiosulphate and hydrochloric acid.

• Word count: 2005