Science Year 10 Term 4 Forensic
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Explain how does blood typing assist forensic scientists in an investigation?
It helps match or rule out a suspect by comparing the blood type found at the scene.
How can height impact the size of blood droplets?
The higher the blood falls from, the bigger the droplets get up to a point.
How can force impact the size of blood droplets?
More force makes smaller drops that spread farther; less force makes bigger, rounder drops.
How can movement of a victim be determined based on the blood spatter?
The direction and pattern of the blood show where and how the person moved.
What is chromatography?
Chromatography is a method used to separate and identify parts of a mixture
What does chromatography do?
It finds out what substances are in a mixture and how much of each is present.
How does chromatography separate mixtures?
It uses differences in how substances stick or move to separate them based on their properties.
What does the 𝑅𝑓 value in chromatography show?
It shows how far a substance moves compared to the solvent.
What is the formula for 𝑅𝑓?
distancesolventmovesfromorigin /distancesolutemovesfromorigin
What happens when blood hits a surface at an angle?
he blood spot becomes longer (elongated) instead of round.
What happens as the angle of impact gets smaller?
The bloodstain becomes more stretched out and may even split into two drops.
What does a circular blood stain mean?
The blood fell straight down (90°) — showing little or no movement.
What does an elongated blood stain mean?
The blood fell at an angle — the long tail shows the direction the person or object was moving.
What is the formula to find the impact angle of a blood droplet?
sin ∅ = width / length