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Crime Busters B

Posted: September 7th, 2020, 8:27 pm
by azboy1910
Let's get this marathon started!

1. Which powder is the only one included in this event with a pH of 2?
2. How might you distinguish cornstarch from flour?
3. Which metals vigorously react with HCL?
4. Is ammonia basic, neutral, or acidic?

Re: Crime Busters B

Posted: January 13th, 2021, 6:09 pm
by azboy1910
It's been like 4 months, can someone please answer? :(

Re: Crime Busters B

Posted: January 14th, 2021, 8:20 am
by SilverBreeze
azboy1910 wrote:
September 7th, 2020, 8:27 pm
Let's get this marathon started!

1. Which powder is the only one included in this event with a pH of 2?
2. How might you distinguish cornstarch from flour?
3. Which metals vigorously react with HCL?
4. Is ammonia basic, neutral, or acidic?
Some more serious answers: (remember to use the spoiler!)
1. vit C
2. cornstarch is fine and white and flour is coarse and a little off-white
3. Zinc, Magnesium
4. basic

And a reminder, please don't troll/give wrong answers on purpose! It can confuse new competitors who can't tell you're trolling. (for example, do NOT taste the powders)

Re: Crime Busters B

Posted: January 14th, 2021, 8:31 am
by ZachMUHS
SilverBreeze wrote:
January 14th, 2021, 8:20 am
azboy1910 wrote:
September 7th, 2020, 8:27 pm
Let's get this marathon started!

1. Which powder is the only one included in this event with a pH of 2?
2. How might you distinguish cornstarch from flour?
3. Which metals vigorously react with HCL?
4. Is ammonia basic, neutral, or acidic?
Some more serious answers: (remember to use the spoiler!)
1. vit C
2. cornstarch is fine and white and flour is coarse and a little off-white
3. Zinc, Magnesium
4. basic

And a reminder, please don't troll/give wrong answers on purpose! I can confuse new competitors who can't tell you're trolling. (for example, do NOT taste the powders)
Sorry, I forgot about the spoilers. I'll take my post down.

Re: Crime Busters B

Posted: January 14th, 2021, 1:48 pm
by SilverBreeze
I'll put up the next set of questions since I'm going to forget:

1. What are the full names of the four DNA bases?
2. Paper-pen chromatography separates ink using what property of the ink molecules?
3. Name one way cat hair differs from dog hair.

Re: Crime Busters B

Posted: January 14th, 2021, 2:18 pm
by ZachMUHS
SilverBreeze wrote:
January 14th, 2021, 1:48 pm
I'll put up the next set of questions since I'm going to forget:

1. What are the full names of the four DNA bases?
2. Paper-pen chromatography separates ink using what property of the ink molecules?
3. Name one way cat hair differs from dog hair.
1. adenine, cytosine, guanine, thymine
2. Polarity, also the size and how attracted the pigments are to the paper has an effect.
3. Dog hair has small ovoid bodies and cat hair has a more imbricate pattern

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?

Re: Crime Busters B

Posted: January 14th, 2021, 7:57 pm
by SilverBreeze
ZachMUHS wrote:
January 14th, 2021, 2:18 pm
SilverBreeze wrote:
January 14th, 2021, 1:48 pm
I'll put up the next set of questions since I'm going to forget:

1. What are the full names of the four DNA bases?
2. Paper-pen chromatography separates ink using what property of the ink molecules?
3. Name one way cat hair differs from dog hair.
1. adenine, cytosine, guanine, thymine
2. Polarity, also the size and how attracted the pigments are to the paper has an effect.
3. Dog hair has small ovoid bodies and cat hair has a more imbricate pattern

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?
Hey, this is the Crime Busters thread, not the Forensics thread. Could you post questions within Crime Busters rules so people can get useful practice for the event? Thanks!

Re: Crime Busters B

Posted: January 14th, 2021, 9:25 pm
by ZachMUHS
SilverBreeze wrote:
January 14th, 2021, 7:57 pm
ZachMUHS wrote:
January 14th, 2021, 2:18 pm
SilverBreeze wrote:
January 14th, 2021, 1:48 pm
I'll put up the next set of questions since I'm going to forget:

1. What are the full names of the four DNA bases?
2. Paper-pen chromatography separates ink using what property of the ink molecules?
3. Name one way cat hair differs from dog hair.
1. adenine, cytosine, guanine, thymine
2. Polarity, also the size and how attracted the pigments are to the paper has an effect.
3. Dog hair has small ovoid bodies and cat hair has a more imbricate pattern

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?
Hey, this is the Crime Busters thread, not the Forensics thread. Could you post questions within Crime Busters rules so people can get useful practice for the event? Thanks!
Sorry, I will ask the questions there. Sorry for the mistake.

Re: Crime Busters B

Posted: February 9th, 2021, 4:29 pm
by azboy1910
Ok, here's a few questions:

1. What type of bonds exist between different water molecules?
2. Does the concentration of hydronium ions increase or decrease with pH?
3. Which layer of the hair shaft contains the pigment of a hair strand?
4. Will the color of a more polar molecule than a less polar molecule appear faster in a paper chromatography test? If so, explain why.