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GCSE: Patterns of Behaviour

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  • Marked by Teachers essays 45
  • Peer Reviewed essays 15
  1. Marked by a teacher

    The Effect of Concentration on the Rate of Reaction between Magnesium [Mg] and Hydrochloric acid [Hcl]

    4 star(s)

    - Collision theory was introduces by Max Trautz and William Lewis in 1916. Chemists believe that the theory explains how the various factors affect reaction rates. It is believed that molecules are only able to react if they bump into each other. When molecules are colliding with each other it can lead to other theory's affecting this such as concentration, temperature and catalysts. The theory states that when molecules are colliding with one another atoms can break and new bonds form creating new molecules. There are molecules in gases and liquids which are always in constant motion colliding in millions.

    • Word count: 4377
  2. Marked by a teacher

    Investigation of the rate of reaction between Magnesium and Hydrochloric acid

    4 star(s)

    Advantages: 'Rate of reaction graphs' are easy to plot using the results from this method. It is the most accurate method because the mass balance is very accurate. Disadvantages: The gas is released straight into the room and if the flask is not covered by the cotton Wool properly, drops might escape from the flask which lowers the total mass of the solution unnecessarily. Name: Gas Syringe Description: This method involves the use of a gas syringe to measure the volume of gas given off. The more gas given off during a time interval, the faster the reaction.

    • Word count: 3932
  3. Marked by a teacher

    Rate of Reaction Chemistry Coursework

    4 star(s)

    This variable in my experiment must stay the same, if I want to achieve reliable results. It has to stay constant otherwise it would be unfair and the results wouldn't be reliable. I will keep it constant by using the same amounts of reactants for each experiment. I will have to decide on the amount of hydrochloric acid I use and the amount of magnesium I will use and keep them the same for every experiment that I do. If I do this I would have this variable controlled. Surface Area- Any reaction in a solid has to take place at the surface at the solid.

    • Word count: 4087
  4. Marked by a teacher

    Marble Chips and Hydrochloric Acid.

    4 star(s)

    To be sure I can rely on my results I will repeat he experiment twice or three times if necessary, because there is chance of inaccurate results for many reasons. I learnt from the trial experiments that it is quite hard to start a stopwatch, pour acid and stick a bung into a boiling tube all at the same time, so I will get someone to assist me while doing so. If the experiment goes on for a ridiculous time, I will cut it off.

    • Word count: 4637
  5. Peer reviewed

    Rates of Reaction

    5 star(s)

    The rate of reaction is the speed of the reaction. It is how quickly a reaction takes place. There are three ways of measuring the rate of reaction. These are 1) Precipitation - this is when a product of the reaction is a precipitate which clouds the solution. Observe a marker through the solution and measure how long it takes for it to disappear. 2) Change in mass (usually a gas given off) - any reaction that produces a gas can be carried out on a mass balance and as the gas is released the mass disappearing is easily measured.

    • Word count: 5142
  6. Peer reviewed

    Temp labreport

    5 star(s)

    Therefore, increasing the temperature increases the energy between the particles and makes them move around a lot more and collide more often. Hypothesis: - The rate of reaction has a positive relationship with the temperature of the Hydrochloric Acid. Apparatus:- 1) Test tube 2) Rubber tube (a.k.a. delivery tube) 3) Measuring cylinder X2 [1-10ml, 1-100 ml] 4) Rubber Bung 5) Stopwatch 6) HCL - 150ml 7) 5x 3 cm of magnesium ribbon 8) Trough full of water 9) Beaker - 400ml 10)

    • Word count: 851
  7. Peer reviewed

    Study on food colourings

    5 star(s)

    as Caramel colouring which is used is cola products, which is found in caramelised sugar and Annatto which is made from the seed in a tropical tree and used to create a reddish orange dye for food. Also natural food colourings can be made from many plants other plants. Natural colourings tend to be a lot more healthy and not such a threat to your health as some artificial food colourings. Health risks of artificial food colourings Different food colourings have different effects.

    • Word count: 1523
  8. Peer reviewed

    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
  9. Peer reviewed

    Formula of Magnesium Oxide

    4 star(s)

    mass of crucible and magnesium after heating: 15.18g ? mass of magnesium before heating: 0.90g ? mass of magnesium oxide: 0.97g ? mass of oxygen: 0.07g Changes occurring during the reaction: � Magnesium stripe glowed and burned bright orange � Sparks appeared on the surface of the magnesium stripe � Started to shrink and change into white powder form but still glowing This shows that magnesium has reacted with oxygen to form magnesium oxide, a white powder. Appearance of contents at the end of experiment: � White powder � Not in a shape of a coil Number of moles of magnesium and oxygen in magnesium oxide: moles = mass moles = mass molar mass molar mass

    • Word count: 847
  10. Peer reviewed

    Cookies experiment Aim: To find out what type of powder reacts more towards heat and therefore expanding inside a cookie mix. Prediction: Based on the research I maid I think that the powder with the least different type of carbohydrates and elements wi

    4 star(s)

    Measure each cookie's length in cm. 8. Bake for 20 minutes at 200�C. 9. Measure the length of each cookie. Materials: � Metal and glass containers � Cookie mix � Ruler � Oven � Tea spoon � 5 different powders (sugar, coffee, cereal crumbs, chocolate milk powder and cinnamon) � Mold to cut cookie mix Variables: * Independent: The type of powder added to the cookie mix * Dependent: Change in length of cookie after being baked * Controlled: Mass of cookie mix for each cookie, amount of powder added, heat of oven, surface on which it was cooked on, type of cookie mix (ingredients), shape of the cookie, ruler used to measure and time inside oven.

    • Word count: 1038
  11. Peer reviewed

    Rate of Reaction Lab

    4 star(s)

    The variables are as follows: Independent Variable: I shall be changing the surface area of the Calcium Carbonate to prove or disprove that it actually makes a difference to the rate of reaction. Dependant Variable: The Carbon Dioxide given off will be my dependant variable in this experiment. Control: I shall try to control the amount of Calcium Carbonate and acid in each experiment, so it is as close to being the same as possible. Apparatus: -Beaker -Measuring Cylinder -Calcium Carbonate -Scales -Hydrochloric Acid (0.4M)

    • Word count: 705
  12. Peer reviewed

    displacement reactions of metal

    4 star(s)

    Iron will displace copper only as it is a less reactive metal. And copper will not be able to displace any metals because it is a very weak metal. * Method 1. I had placed the three pieces of the four different metals on a tile containing twelve holes. 2. Then I added the aqueous solution that is magnesium solution, iron solution, zinc solution & copper solution onto the different metals.

    • Word count: 414
  13. Peer reviewed

    To find out and analyse what factors affect the rate of reaction between limestone and acid rain.

    4 star(s)

    * Pressure (of gas) However in my experiment I am only going to investigate one of these factors. I have decided that surface area isn't the best one to choose because I only have 3 different sized marble chips so I wouldn't get a very large range of results to plot onto my graphs. I have decided to use concentration as my factor to investigate as I believe it will give me a better range of results and more interesting graphs to plot. Preliminary Experiment For my preliminary experiment, I reacted some hydrochloric acid (with a concentration of 2 moles)

    • Word count: 1101

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