Designing an Investigation: Solubility of Organic Molecules

Questions and Answers

What is the main purpose of identifying variables in an investigation?

To control and manipulate the independent variable

A hypothesis should be a proven fact before starting an investigation.

False

What is the importance of graphing data in an investigation? (Answer should be around 2-3 sentences)

Graphing data helps to visualize the results, identify patterns and trends, and make it easier to draw conclusions.

When designing an investigation to test the solubility of different chain organic molecules, it is essential to ______________ the temperature and pressure to ensure fair testing.

<p>control</p> Signup and view all the answers

Match the following terms with their definitions:

<p>Independent variable = The variable being changed or manipulated Dependent variable = The variable being measured or observed Control variable = The variable kept constant to ensure fair testing</p> Signup and view all the answers

Study Notes

Designing an Investigation for Solubility of Organic Molecules

Key Objectives

Design an investigation to determine which of the 5 chain organic molecules has the best solubility in water
Identify and control variables affecting the investigation
Collect and analyze graph data to draw conclusions
Identify and minimize safety risks associated with the investigation

Hypothesis

A clear hypothesis should be stated, such as: "The shorter the chain length, the better the solubility in water"

Variables

Independent variable: type of organic molecule (5 different chain lengths)
Dependent variable: solubility of each molecule in water
Controlled variables: temperature, volume of water, method of mixing, etc.

Data Collection and Graphing

Quantitative data should be collected on the amount of each molecule that dissolves in a fixed volume of water
Data should be presented in a graph, with chain length on the x-axis and solubility on the y-axis
The graph should be analyzed to identify trends and patterns

Safety Risks and Precautions

Handling of chemicals: wear gloves, goggles, and laboratory coats
Spills and accidents: have a spill response plan in place, and ensure easy access to a sink and cleaning materials
Fire hazards: keep away from open flames and heat sources

Conclusion and Application

The investigation should lead to a conclusion about which molecule has the best solubility in water
The findings should be discussed in relation to the molecular structure and chain length
The implications of the investigation should be applied to molecules with bigger chain lengths, exploring how solubility changes with increased chain length