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Luminol was first used for murder investigations in the early 20th century. It was introduced by forensic scientists in the 1930s as a method for detecting traces of blood at crime scenes that may not be visible to the naked eye.

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1y ago

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Why does the line of best fit have to start from 0?

The line of best fit does not necessarily have to start from 0. It depends on the data and the model being used. In some cases, the intercept (where the line crosses the y-axis) can be a meaningful value, and in those cases, the line may not start from 0.


When do D orbitals start gettin filled?

D orbitals start to get filled after the 3p orbitals in the periodic table. They are typically filled after filling the 4s orbital, as the 3d orbitals are the next to be filled in the transition metal series.


Why did the potassium permanent crystals in Figure 7.12 on page 197 start to dissolve in water without being stirred or shaken?

The potassium permanganate crystals started to dissolve in water without being stirred or shaken because of the process of diffusion. Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. The crystals dissolved as their particles spread out and mixed with the water molecules.


What minerals start with the letter i?

Some minerals that start with the letter "i" include ilmenite, iodargyrite, and iolite.


When a substance is undergoing change of state the temperature of the substance does not change until the is complete?

During a change of state, such as melting or boiling, the temperature of the substance remains constant because the heat energy is being used to break intermolecular forces rather than increase the kinetic energy of the particles. Once the change of state is complete, the temperature will start to rise again as thermal energy is being used to increase kinetic energy.

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The Holocaust was not a conflict. It was nass murder. Please see the related question.


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