Bonding - Required Practical / Method Cards

Question 1

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What is the independent variable in a bonding melting point investigation?

Answer 1

The substance being heated

The independent variable is the factor that is changed or controlled in a scientific experiment.

Question 2

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What is the dependent variable in a melting point experiment?

Answer 2

The temperature at which the substance melts

The dependent variable is what is measured in the experiment.

Question 3

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Name two control variables for comparing melting points.

Answer 3

• Mass of substance
• Heating rate

Control variables are kept constant to ensure a fair test.

Question 4

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Why is it important to repeat melting point measurements?

Answer 4

To improve reliability and allow a mean to be calculated

Repeating measurements helps to identify any anomalies and ensures accuracy.

Question 5

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Why should goggles be worn during heating?

Answer 5

To protect eyes from hot substances or splashes

Safety goggles are essential for preventing eye injuries in a laboratory.

Question 6

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How could you improve accuracy when measuring melting point?

Answer 6

Heat slowly near the expected melting point and use a digital thermometer

This method allows for more precise readings of the melting point.