Potions & Poisons B

Test your knowledge of various Science Olympiad events.
jxxu20
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Re: Potions & Poisons B

Postby jxxu20 » March 5th, 2019, 3:39 pm

Great job! Everything looks good, and #4 is rubbing alcohol, which is C3H8O . Also, for #5, cottonmouths can be mistaken for copperheads, and the difference is that copperheads have a "hershey kiss" scale pattern whereas cottonmouths do not .

Your turn, and anyone can take a shot at my chem problems just for the fun of it :)!
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Re: Potions & Poisons B

Postby starfruit » March 7th, 2019, 5:32 pm

1.) Cadmium sulfide???
2019 events-
potions&poisons/heredity/crimebusters/codebusters

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Re: Potions & Poisons B

Postby jxxu20 » March 7th, 2019, 6:44 pm

Yup!
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Re: Potions & Poisons B

Postby coopsadoodles » March 8th, 2019, 6:53 pm

3. Consider the chemical equation for cellular respiration. What mass -- in grams -- of carbon dioxide forms in the reaction of 25 grams of glucose and 40 grams of oxygen?

36.7g of CO2
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Re: Potions & Poisons B

Postby Froggie » March 10th, 2019, 4:24 am

2. 125 g/0.95 = 131.6 g? It’s probably not this simple...
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Re: Potions & Poisons B

Postby dvegadvol » March 20th, 2019, 6:00 pm

27. The electronegativity difference in diatomic elements is always equal to:

a. -2
b. -1
c. 0
d. +1
e. +2

28. Bonds between diatomic molecules are always;

a. Ionic
b. Covalent
c. Metallic
d. Polar covalent

29. T or F: An ionic bond is the complete transfer of outer valence electrons from one atom to another.

30. Match the toxin to the organism;

a. Cicutoxin 1. Quercus spp.
b. Amatoxins 2. Crotalus horridus
c. Three-finger toxin 3. Loxosceles reclusa
d. Tropane alkaloids 4. Lactrodectus mactans
e. Hydrolyzable gallotannins 5. Toxicodenron radicans
f. Canebrake venom 6. Daucus carota
g. Sphingomyelinase D 7. Galerina marginata
h. ⍺-latrotoxin 8. Micrurus fulvius
i. Urushiol 9. Hyoscyamus niger


31. Factors that effect the toxicity of a poison include all except:

a. Duration of exposure
b. Toxicity
c. Temperature
d. Dose
e. Route of exposure

32. A colloid has two phases:

a. stationary, mobile
b. dispersed, continuous
c. dissolution, sedimentation
d. dilution, disassociation

33. The toxicity of isopropanol is about _______________ ethanol.

a. 2.0 times less than
b. 1.2 times less than
c. about the same as
d. 1.2 time more than
e. 2.0 times more than

UTF-8 U+6211 U+662F
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Re: Potions & Poisons B

Postby UTF-8 U+6211 U+662F » March 20th, 2019, 6:09 pm

Froggie wrote:2. 125 g/0.95 = 131.6 g? It’s probably not this simple...

Nah, the correct answer would be
3Si + 2N2 -> Si3N4

which turns out to be 78.8 grams of silicon.

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Re: Potions & Poisons B

Postby Crimesolver » March 20th, 2019, 9:30 pm

dvegadvol wrote:27. The electronegativity difference in diatomic elements is always equal to:

a. -2
b. -1
c. 0
d. +1
e. +2

28. Bonds between diatomic molecules are always;

a. Ionic
b. Covalent
c. Metallic
d. Polar covalent

29. T or F: An ionic bond is the complete transfer of outer valence electrons from one atom to another.

30. Match the toxin to the organism;

a. Cicutoxin 1. Quercus spp.
b. Amatoxins 2. Crotalus horridus
c. Three-finger toxin 3. Loxosceles reclusa
d. Tropane alkaloids 4. Lactrodectus mactans
e. Hydrolyzable gallotannins 5. Toxicodenron radicans
f. Canebrake venom 6. Daucus carota
g. Sphingomyelinase D 7. Galerina marginata
h. ⍺-latrotoxin 8. Micrurus fulvius
i. Urushiol 9. Hyoscyamus niger


31. Factors that effect the toxicity of a poison include all except:

a. Duration of exposure
b. Toxicity
c. Temperature
d. Dose
e. Route of exposure

32. A colloid has two phases:

a. stationary, mobile
b. dispersed, continuous
c. dissolution, sedimentation
d. dilution, disassociation

33. The toxicity of isopropanol is about _______________ ethanol.

a. 2.0 times less than
b. 1.2 times less than
c. about the same as
d. 1.2 time more than
e. 2.0 times more than



answer
27. c
28. b
29. T
30. a-6
b-7
c-8
d-9
e-1
f-2
g-3
h-4
I-5
31.c
32.b
33. a(?)
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Re: Potions & Poisons B

Postby dvegadvol » March 22nd, 2019, 3:16 pm

All good except 33. is 2.0 times more toxic.

Bravo!

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Re: Potions & Poisons B

Postby Crimesolver » March 22nd, 2019, 6:31 pm

Thanks!

What is the difference between colloid and suspension?
Bronze is a combination of which metals?
T or F - copper is not used in cooking because of its inability to conduct heat evenly
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Re: Potions & Poisons B

Postby Deathstalker » March 22nd, 2019, 7:01 pm

Crimesolver wrote:Thanks!

What is the difference between colloid and suspension?
Bronze is a combination of which metals?
T or F - copper is not used in cooking because of its inability to conduct heat evenly



1. A colloid is a heterogenous mixture that can pass through a filter, while a suspension cannot.
2. Bronze is a combination of Copper and Tin
3. F
Last edited by Deathstalker on March 23rd, 2019, 4:31 am, edited 1 time in total.

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Crimesolver
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Re: Potions & Poisons B

Postby Crimesolver » March 22nd, 2019, 10:37 pm

You forgot the third question ;)
But for now
answers
1. Colloids are actually a homogenous mixture that consists of particles that are permanently suspended, while suspensions are a heterogenous mixture that has particles that settles. Only the suspension can be separated through a filter.
2. Yes
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Re: Potions & Poisons B

Postby Deathstalker » March 23rd, 2019, 4:32 am

Crimesolver wrote:You forgot the third question ;)
But for now
answers
1. Colloids are actually a homogenous mixture that consists of particles that are permanently suspended, while suspensions are a heterogenous mixture that has particles that settles. Only the suspension can be separated through a filter.
2. Yes

I'm pretty sure Colloids are considered heterogeneous mixtures in most cases.

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Re: Potions & Poisons B

Postby dvegadvol » March 23rd, 2019, 9:31 am

A colloid is somewhere in between a truly homogeneous mixture and a heterogeneous mixture. At the microscopic level, a colloid is heterogenous. At the macroscopic level it is homogenous. Macroscopically, a colloid shows a single "phase": at this level, it will always have the same composition. But if you look at the microscopic level, you will find that there are at least two different regions, each with a different composition.

The individual particle in a colloid are small enough so that thermal movement (Brownian motion) prevents them from settling to the bottom of a container through gravity, although they can be separated by centrifugation (which is not possible for a true homogeneous mixture). On the other hand, colloids are usually not transparent, as they disperse light because the particles are as large or larger than the wavelength of visible light.


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