Science Assingment
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
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