Assignment Spreadsheet

UNIVERSITI PENDIDIKAN SULTAN IDRIS TKU 3023 INFORMATION TECHNOLOGY AND COMMUNICATION IN CHEMISTRY ASSIGNMENT : SPREADSHEET TITLE : EFFECT OF SURFACE AREA ON THE RATE OF REACTION NAME SITI NOR AMIRA BT ZINOL NOR MADIHAH BT ALI

MATRIC NUMBER D20081032278 D20081032310

GROUP : B ( THURSDAY- 1P.M-4P.M) LECTURER’S NAME : MISS ASMAYATI BINTI YAHAYA

A EFFECT OF SURFACE AREA ON THE RATE OF REACTION

Teacher’s guide / Chemistry Form 5 / Spreadsheet SCIENTIFIC CONCEPT For the quantity of the same material, if the size of reactant is small, it means that the surface area is big for the reaction occur. Two experiment is done to study the rate of reaction between the thick piece of marble and the powder of marble in the 0.2 mole dm-3 of hydrochloric acid. The rate of reaction is increase when the surface area is large.

Experiment 1: Time (minute) Burette Readings (cm3) Volume Of gas (cm3)

0

1/2

1

1 1/2

2

2½

3

3 1/2

4

50. 0

45.5

41.5

38.0

35.0

32.5

30.5

28.0

27.5

0.0

4.5

8.5

12.0

15.0

17.5

19.5

22.0

22.5

Experiment 2: Time 0 (minute) Burette 50.0 Readings (cm3) Volume 0.0 Of gas (cm3)

1/2

1

1 1/2

2

2½

42.0

35.0

30.0

25.5

22.0

19.5

17.5

16.0

8.0

15.0

20.0

24.5

28.0

30.5

32.5

34.0

We use the knowledge / concept of solubility for our benefit.

3

3 1/2

4

UNIQUE FEATURE OF THIS ACTIVITY This activity requires the student to calculate the gas collected in a time to make the graphs sum of gas collected versus time. Two graphs will be presented to compare the rate of reaction between the thick piece of marble and the powder of marble in the 0.2 mole dm-3 of hydrochloric acid. The unique feature of using spreadsheet are:  The data can be manipulated easily. For example every half minute, we take the burette readings for four minutes. Then, we calculate the sum volume of gas by using the formula final readings minus initial readings.  Data displayed in a systematic manner, save time in drawing graphs, show relationship of different surface area of reactant against time  The ability to tabulate data and assists student to calculate the number of moles of hydrochloric acid and marble (CaCO3) used. However, student must set up their spreadsheet first. After that, student can just enter the data in the table. Then, the student can calculate the maximum volume of carbon dioxide gas collected at the end of the experiment 1 and 2. As the result, the volume is the same due to the mass of the marble used in the experiment 1 and 2 are the same.  Spreadsheet are suitable and very practical for repetitive calculations. For instance, if the student change the value of the burette readings at any cells, the value of carbon dioxide gas collected will also change. The points on the graph will also automatically change according to the data entered. This allows student to do more important things in science and no recalculations or re-graphing needed.

ENGAGE

THE SOLUBILITY OF DIFFERENT SALT

Powder Of Salt

Thick Piece Of Salt

1. Why we put different type of salt to the water ? 2. Which salt have a greater surface area ? thick piece of salt or powder of salt? 3. Which salt will be soluble first in the water? 4. Why thick piece of salt soluble in the water slower than powder of salt ? 5. How could this happen ?

EMPOWER

1. Students plan an experiment to observe the effect of surface area on the rate of reaction

2. They are given the following apparatus : •

Burette

•

Erlenmeyer Flask

•

Retort stand

•

Beaker

•

Stopper

3. They are given the following material •

Water

•

HCl

•

Thick piece of marble

•

Powder of marble

4. Students are asked to plan an experiment to show that thick piece of marble and powder of marble have different rate of reaction with acid hydrochloric 5. Students should know the effect of surface area on the rate of reaction 6. Students have to construct a hypothesis before doing the experiment 7. Help students to determine the variables involve 8.The procedures of conducting the experiment is discussed 9.Burette reading will be take for the both of reaction which is reaction between thick piece of marble with HCl and reaction between powder of marble with HCl. Burette reading means the volume of carbon dioxide release between the reaction of marble and HCl. The time will be take for the both of reaction to observe the reaction rate. 10. Students are ask to prepare table and graph volume of gas collected over time with the spreadsheet

How to set up the spreadsheet 1. Click B4, write experiment 1 2. Click on cell B6, write the “time (minutes)” on the cell. The same step, enter all the data in the other cell. 3. Click on borders and choose draw table. 4. Then, click on cell B10, write experiment 2 5. Copy the above table from cell from B6 to M8, and paste on cell B12. The same table will appear. Then, writw thw new data for the experiment 2.

How to draw a graph with the spreadsheet 1. Select a line graph. 2. Highlights E8 to M8, click “series”, this will draw both lines row 8 (for experiment 1) and row 14 (experiment 2). 3. In the series box, label series 1 as “experiment 1” and series 2 as “experiment 2”. 4. Click category (x) axis label, highlight cell E6 to M6 (this will show the actual scale of x-axis according to the data), click “next”. 5. Name the graph. Lastly, label the x-axis and y-axis.

RESULTS

Question 1. Based on the plotted graph deduce the effect of surface area on the reaction rate ? 2. How does surface area affect a chemical reaction? 3. What is the variable we keep constant in ths experiment ?

Answers : 1. Based on the plotted graph we can see that graph for experiment 2 have a higher slope than graph for the experiment 1. This is show that the reaction rate for the experiment 2 which is we use powder of marble greater than experiment 1 which is we use thick piece of marble . 2. . If one of the reactants is a solid, the surface area of the solid will affect how fast the reaction goes. This is because the two types of molecule can only bump into each other at the liquid solid interface, i.e. on the surface of the solid. So the larger the surface area of the solid, the faster the reaction will be.Smaller particles have a bigger surface area than larger particle for the same mass of solid. There is a simple way to visualize this. So in this experiment powder of marble have a bigger surface area and thick piece of marble have smaller surface area 3. We keep constant the temperature of experiment, mass of marble, concentration and volume of HCl

ENHANCE

Picture 1

Picture 2

1. Can you see the picture above? What is the difference between the pictures that expose one’s body to the sun? Which one will dry first? Explain why.

ANSWERS: 1. The difference between the pictures above is the towel in picture 1 almost overlap and the surface area expose to the sun is smaller compared to the cloth in picture 2. cloth in the picture 2 will dry first due to the large surface area expose to the sun.