Extended Experimental Investigation

Rates of Reaction: Solubility Rate and Temperature

(Title: Include the Independent and Dependent Variables)

Aim:

(To Investigate the Independent and Dependent variables)

Hypothesis:

(If the Independent Variable increases, then the Dependent variable

increases / decreases, linearly / quadratically, because …)

Introduction and Back Ground Theory

State Summary of Particle Theory (Yr 8, Yr 9):

Summarize 5 ways to speed up a reaction

Action / Reason
Temperature
Concentration
Area / Size
Stirring Rate
Pressure
Catalysts

It typically takes 3 min = 180s for a tablet to dissolve in room temperature water at 20oC. Use this estimate to complete the following table and then draw two neat graphs showing Tablet Dissolving Time versus Temperature, and the Dissolving Rate versus Temperature as a prediction for what you will find in this experiment.

Temp
(oC) / Dissolving
Time (s)
0
10
20 / 180
30
40
50
60

(Equations for Graph: Time = 720 2^(-Temp/10).)

Variables:

Independent:

Dependent:

Controlled:

Materials

(Dot point list, give quantities)

  • 1 x ……

Method

(Numbered list: .
1) The Noun was verbed
2) Nouns were verbed)

Diagram: (Use only a pencil and ruler, include labels and a title)

(Use equipment symbols on Red Book page 1)

Risk Assessment

Hazard / Risk / Safety Measures

Results

In an EEI, your teacher does NOT know your experiment. Include sentences describing each table and graph. Give examples of each calculation used. Include photographs, etc.

List and measure all controlled Variables:

Temp
(oC) / Dissolving
Time (s)
60 (max)

Plot a graph to check your data.

In your own work, use whole page graphs.

Label and Describe tables and graphs.

Results: Skill Building

To build skills, some extra measurements and calculations will be undertaken:

Determining Tablet Mass and Volume

Q1 Use rulers to measure the volume of the tablet.

r (cm, standard form) r (m, sci notation)

= =

h (cm, standard form)h (m, sci notation)

= =

V (cm3, standard form) V (m3, using sci notation)

= =

Q2 Measure the mass of the tablet:

m (g, standard form) m (kg, sci notation)

= =

Q3 The density of the tablet is given by the mass divided by the volume. Calculate the density (d) of the tablet:

d (g/cm3, standard form) d (kg/m3, sci notation) =

= =

Q4 The density of water is 1 g/cm3 = 1000 kg/m3. If the tablet density is less than the density of water, it will float. Determine from your calculations if the tablet will float or sink.(Does this agree with your observations.)

Q5 The average mass of an atom in your tablet is 1.992 × 10-26 kg. Determine approximately how many atoms there are in your tablet.

Q6 Consider your maximum temperature data point. Determine the average number of atoms reacting per second as your tablet dissolves for this data point. Write your answer in both standard form and scientific notation.

Maximum atoms per second =

Discussion

(Use third person. Do not discuss the people in your group.)

Para: Summarize the Aim and Hypothesis, and the experimental method.

Para: Discuss Results table and graph and implications for hypothesis. Revise hypothesis if necessary. (Specifically quote actual numbers and data from table and graph to justify your claims.)

Para: Discussion of errors. (Discuss equipment errors and problems, discuss outliers on graph, discuss spread of data away from line of best fit on graph, discuss steps taken to minimize errors.)

Para: Future experiments. (Discuss how to improve or redesign or extend this experiment.)

Conclusion

(Written in third person.

Repeat Aim and Hypothesis.

Discuss results and revised hypothesis from experiment

Abstract

Normally goes under title.

6 brief sentences giving aim, hypothesis,

method, results, quality of results,

future directions.

References

(Use Harvard format from school home page or from WORD document.)