All of the following are possible sources of error in a scientific investigation except for
o measuring materials such as mass and volume incorrectly.
o recording experimental data incorrectly.
o having a constant in your experiment.
o
not being able to complete all trials of an experiment
next

The correct answer will be option-having a constant in your experiment

Explanation:

A scientific experiment is designed in a way that it tests the predicted hypothesis related to the natural event.

The hypothesis can be tested only after the collection of the result is done in a proper way as the errors done while collecting the results can lead to the errors in results and hence the hypothesis cannot be tested.

In the given question, the collection of the results is not influenced by having a constant variable in the experiment which is the variable which remains the same and does bot change throughout the experiment.

Thus, the selected option is the correct answer.

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.

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explanation: