Forensics C

[SilverBreeze]

Let's start!

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1. What is the balanced reaction between calcium carbonate and hydrochloric acid?
2. What color does KCl burn?
3. What general type of fingerprint (loop, whorl, arch) is a double loop fingerprint?

[lilacs10]

1. CaCO3 (s) + 2HCl (aq) --> CO2 + CaCl2 (aq) + H2O (l) 2. Light purple/ lavender 3. Whorl?

[SilverBreeze]

1. CaCO3 (s) + 2HCl (aq) --> CO2 + CaCl2 (aq) + H2O (l) 2. Light purple/ lavender 3. Whorl?

All correct! Your turn!

[SilverBreeze]

Revive time...

1. If crack A stops at crack B, which crack was first?
2. What color does sucrose turn in Benedict's solution?
3. Oh no! Your flame loop burns yellow no matter which compound you test. What piece of equipment should you use?

[Creationist127]

Revive time...

1. If crack A stops at crack B, which crack was first?
2. What color does sucrose turn in Benedict's solution?
3. Oh no! Your flame loop burns yellow no matter which compound you test. What piece of equipment should you use?

Click to Show Answer

Crack B
Pretty sure sucrose doesn't react with Benedict's
A piece of cobalt-blue glass?

[SilverBreeze]

Revive time...

1. If crack A stops at crack B, which crack was first?
2. What color does sucrose turn in Benedict's solution?
3. Oh no! Your flame loop burns yellow no matter which compound you test. What piece of equipment should you use?

Click to Show Answer

Crack B
Pretty sure sucrose doesn't react with Benedict's
A piece of cobalt-blue glass?

All correct!

[ThomasL]

I'll start again:)

1. How many deltas are in a loop?
2. What powders are identified with a) fertilizer (I believe there are multiple--name at least one), b) eye wash, c) salt substitute?
3. In mass spectrometry, what are the relative abundances of the M+1 and M+2 (Cl and Br) peaks, if they exist?

[ZachMUHS]

1. What is snell's law and what is the common refractive index of air?
2. What is the term for the study of pollen and dusts?
3. What type of finger-printing is best on paper?

[ThomasL]

Click to Show Answer

1. Snell's law relates angles of incidence and refraction through the formula n1*sin(theta1) = n2*sin(theta2), where n are the refractive indices of the two media. Typical refractive index of air is close to 1.
2. Palynology
3. Ninhydrin

[ZachMUHS]

Click to Show Answer

1. Snell's law relates angles of incidence and refraction through the formula n1*sin(theta1) = n2*sin(theta2), where n are the refractive indices of the two media. Typical refractive index of air is close to 1.
2. Palynology
3. Ninhydrin

Correct!