Science Trivia

[bamboo7]

Originally posted by tenchu
V=IR

V = Voltage
I = Current
R = Resistance

Ohms Law. This i know!

 

[tenchu]

Originally posted by bamboo7


Ohms Law. This i know!

Yah!

 

[Coronado]

Ok then .... In a parallel circuit.... if the resistance increases and the volts stay the same........ what happens to the current?

 

[DisneyPhD]

Ok I'll take a stab at this. The current will increase in the path of least resistance. Did I mention I hate electronics.

If that's right, here's a new question.

When Ice melts
1. What happens to the entropy of the H2O molecules?
2. Is this an exothermic or endothermic process?
3. Is this a chemical or physical change?

 

[tenchu]

Originally posted by DisneyPhD
Ok I'll take a stab at this. The current will increase in the path of least resistance. Did I mention I hate electronics.

If that's right, here's a new question.

When Ice melts
1. What happens to the entropy of the H2O molecules?
2. Is this an exothermic or endothermic process?
3. Is this a chemical or physical change?

Increased entropy, endothermic and physical.

 

[DisneyPhD]

And people say chemistry is hard.

What are some of the differences between alpha, beta and gamma radiation?

 

[tenchu]

Originally posted by DisneyPhD
And people say chemistry is hard.

What are some of the differences between alpha, beta and gamma radiation?

Alpha will be stopped by a sheet of paper, beta will be stopped by a sheet of lead and gamma needs lots.

They decay differently.

And some other stuff too! :wave:

 

[DisneyPhD]

Which of these three types of radiation are particulate (what are the particles) and which are electromagnetic?

 

[Coronado]

Gama particles.....the other two are wave forms

 

[DisneyPhD]

Originally posted by Coronado
Gama particles.....the other two are wave forms

It's the other way round. Alpha and Beta radiation consist of particles while gamma radiation is electromagnetic (just like visible light but with much shorter wavelengths and much higher energy).

By which of these three types of radiation is Uranium most likely to decay?

 

[tenchu]

Depends what type of uranium it is.
Normally alpha then beta though.

 

[DisneyPhD]

Correct.

What condition in the atomic nucleus usually results in positron emission?

 

[tenchu]

Originally posted by DisneyPhD
Correct.

What condition in the atomic nucleus usually results in positron emission?

Not dure if i understand the question.

When electrons are lost?

 

[DisneyPhD]

Whether a nucleus undergoes beta (electron) emission or positron emission depends on the ratio of protons to neutrons. When a nucleus has too many neutrons, a neutron will be converted to a proton by emitting an electron.

Positron emission is essentially the conversion of a proton to a neutron through a similar process.

Have we had enough of nuclear chemistry?

Tenchu, you deserve course credit for 2nd semester General Chemistry. I wish all my students knew this material as well as you.

 

[bamboo7]

Originally posted by DisneyPhD

Have we had enough of nuclear chemistry?

i certainly think so. not exactly my field of expertise.

 

[tenchu]

Originally posted by DisneyPhD


Tenchu, you deserve course credit for 2nd semester General Chemistry. I wish all my students knew this material as well as you.

Cheers! The fact I'm doing a degree in Biology (with chemistry) might have something to do with it!

New question then: What is the common name of the bird Aquila chrysaetos ?

 

[DisneyPhD]

Originally posted by bamboo7


i certainly think so. not exactly my field of expertise.

Ok let's take it down a notch.

Who is the only scientist to be ALIVE at the time an element was named in his/her honor?

Oops sorry tenchu, you beat me in with a new question.

I'll guess ostrich. It's been a looooooong time since biology class for me and I was never very good with all those latin names

 

[tenchu]

Originally posted by DisneyPhD


Ok let's take it down a notch.

Who is the only scientist to be ALIVE at the time an element was named in his/her honor?

Oops sorry tenchu, you beat me in with a new question.

I'll guess ostrich. It's been a looooooong time since biology class for me and I was never very good with all those latin names

Nope it aint ostrich.

Is your one Einstein?

 

[DisneyPhD]

Originally posted by tenchu


Nope it aint ostrich.

Is your one Einstein?

How about a sea gull?

Not Einstein, although an element is named for him after his death. This one was in the past 10 years.

 

[tenchu]

Originally posted by DisneyPhD


How about a sea gull?

Not Einstein, although an element is named for him after his death. This one was in the past 10 years.

I thought Einstenium was discovered in 1952 and that Einstein died in 1955? (I'll have another look)

Sea Gull is wrong too. Think bigger.