Crime Busters B

[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?

[azboy1910]

It's been like 4 months, can someone please answer?

[SilverBreeze]

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)

[ZachMUHS]

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.

[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.

[ZachMUHS]

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?

[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.

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!

[ZachMUHS]

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.

[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.

[aakoala]

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.

Click to Show Answer

1. Hydrogen bonds

Click to Show Answer

2. The concentration of hydronium ions decreases with pH

Click to Show Answer

3. The cortex

Click to Show Answer

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?