Science Assingment

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Aim:

To investigate the weathering of marble due to acid rain.
 
Hypothesis:

The larger the surface area the quicker the reaction. Because there will be more surface area or room to collide with the marble chip particles therefore resulting in a quicker reaction. The smaller the surface area, the slower the reaction will be as there will be fewer particles so less chance of a collision and a lower rate of reaction.

 
Equipment:

• 1x Test Tube Rack
• 2x Test tubes
• 1x Delivery tube (U bend) with rubber stopper
• Lime water
• 1M HCI
• 2 Large marble chips
• 4-5 Small marble chips
• 1x Stopwatch
• 1x Black card with blue tack
 
Method:
Step 1- Arrange test tubes and delivery tube.
Step 2- Arrange black cardboard behind the rack (this is to provide a contrast to the reaction) Step 3- Fill the unstoppered test tube with lime water, making sure to fully cover the end of the delivery tube. Step 4- Place the small marble chips in the other test tube, pour on a small quantity of HCI. Step 5- Quickly restopper the test tube.

Step 6- Use the stop watch to time how long it takes the lime water to go cloudy. Step 7- Repeat using the large marble chips.
 
• Any reaction involving a solid can only take place at the surface of the solid. • If the solid is split into several pieces, the surface area increases. What effect will this have on rate of reaction? • This means that there is an increased area for the reactant particles to collide with. • The smaller the pieces, the larger the surface area. This means more collisions and a greater chance of reaction.  

• Marble chips are made of calcium carbonate. They react with hydrochloric acid to produce carbon dioxide. • The effect of increasing surface area on the rate of reaction can be measured by comparing how quickly the mass of the reactants decreases using marble chips of different sizes. • Risk Assessment:

|Risk...
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