Crime Busters B

Test your knowledge of various Science Olympiad events.
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azboy1910
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Crime Busters B

Post 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?
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azboy1910
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Re: Crime Busters B

Post by azboy1910 »

It's been like 4 months, can someone please answer? :(
Last edited by azboy1910 on January 13th, 2021, 6:20 pm, edited 1 time in total.
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SilverBreeze
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Re: Crime Busters B

Post 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)
Last edited by SilverBreeze on January 14th, 2021, 8:30 am, edited 2 times in total.
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Re: Crime Busters B

Post 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.
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SilverBreeze
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Re: Crime Busters B

Post 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.
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Re: Crime Busters B

Post 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?
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Re: Crime Busters B

Post 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!
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ZachMUHS
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Re: Crime Busters B

Post 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.
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azboy1910
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Re: Crime Busters B

Post 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.
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aakoala
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Re: Crime Busters B

Post by aakoala »

azboy1910 wrote: February 9th, 2021, 4:29 pm 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.
1. Hydrogen bonds
2. The concentration of hydronium ions decreases with pH
3. The cortex
4. The color of a more polar molecule will appear faster. This is because water is a polar molecule, meaning that it can pull more polar molecules better.
Here's another set of questions!
1. Compare and contrast HDPE and LDPE
2. A soil sample is found to be 35% clay, 30% silt, and 35% sand. Determine the type of soil.
3. Give 3 examples of minutiae
4. What does PCR stand for? What are its 3 steps?
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