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[L-Girl]

Which gas cannot be used as a fuel?
A carbon monoxide
B hydrogen
C methane
D nitrogen

help please! well i know that hydrogen and methane can be used as a fuel, but i don't get why the answer is D not A! helpppp

 

[Khaled Ayman]

Which gas cannot be used as a fuel?
A carbon monoxide
B hydrogen
C methane
D nitrogen

help please! well i know that hydrogen and methane can be used as a fuel, but i don't get why the answer is D not A! helpppp

CO is a fuel while N is not a fuel. There was a similar question that said Oxygen instead of Nitrogen. The fuels that I know are CO CH4 H2 all hydrocarbons and some others but N2 and O2 are defenatliy not a fuel

 

[L-Girl]

A is a fuel while nitrogen is not

carbon monoxide is a fuel

 

[Khaled Ayman]

carbon monoxide is a fuel

Yes it is it can be used but it has the same problem as H2 in transport as it is a gas. I couldn't believe it when my teacher told me too.

 

[L-Girl]

Yes it is it can be used but it has the same problem as H2 in transport as it is a gas. I couldn't believe it when my teacher told me too.

oh thank you so much

 

[Rahma Abdelrahman]

Shouldn't the answer be A? (nov. 2010)

 

[Khaled Ayman]

Shouldn't the answer be A? (nov. 2010)
View attachment 12301

Nope it should be B hydrated CoCl2 is pink and it is an exothermic reaction as forming of bonds will give energy. Steam will trick you as it will increase the temperature so the opposite reaction will have to be decrease but it doesn't depend on steam it depends if the bonds were broken or formed

 

[saroooor]

Biology Questions:
November 2006
Number 26 I understand 1 or 2 parents required but how more male than female ???
November 2008
Number 3 The petals are separated from petals , but there is 4 stamens only ????

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

Biology Questions:
November 2006
Number 26 I understand 1 or 2 parents required but how more male than female ???

Assalam-o-alaikum wr wb..
more males cuz most of them gametes (anthers) are lost!

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

Biology Questions:November 2008
Number 3 The petals are separated from petals , but there is 4 stamens only ????

this is bcoz the flower shown in the picture isn't the full flower...it's the half flower and therefore in a full flower the stamens will be more than 4..

Hope that helps!

 

[Khaled Ayman]

Biology Questions:
November 2006
Number 26 I understand 1 or 2 parents required but how more male than female ???
November 2008
Number 3 The petals are separated from petals , but there is 4 stamens only ????

Nov 2006
the male gametes are more than the female as there will be more pollens than egg cells. Even in the humans millions of sperms are produced for a few amount of egg cells which is usually one
Nov 2008 it is half of a flower so there will be some left in the other side that wasn't shown

 

[saroooor]

Assalam-o-alaikum wr wb..
more males cuz most of them gametes (anthers) are lost!

How are the anthers are lost ?

 

[saroooor]

this is bcoz the flower shown in the picture isn't the full flower...it's the half flower and therefore in a full flower the stamens will be more than 4..

Hope that helps!

Oh yeah . I understood that .

 

[saroooor]

How are the anthers are lost ?

You mean more pollen are landing on the stigma right so they will be more than the ovules inside. I got it !! Thanks A lot .

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

How are the anthers are lost ?

when they are carried by wind, in wind pollinated flowers or by insects in insect pollinated flowers!
bcoz not all of them reach the stigma....

 

[Khaled Ayman]

when they are carried by wind, in wind pollinated flowers or by insects in insect pollinated flowers!
bcoz not all of them reach the stigma....

You mean pollen not anther right?

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

You mean more pollen are landing on the stigma right so they will be more than the ovules inside. I got it !! Thanks A lot .

nope...i mean in sexual reproduction...flowers are either insect pollinated or wind pollinated...in insect pollinated flowers not all of the anthers/pollen grains reach the sticky stigma...some may be left over on the bodies of insects...which means that there are more pollen grains as some of them are lost!
same is the case with wind pollinated flowers....they are carried by wind so they can be scattered everwhere...

i hope this clears your doubt

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

You mean pollen not anther right?

pollen grains are inside the anthers only..so sorta yeah!

 

[saroooor]

when they are carried by wind, in wind pollinated flowers or by insects in insect pollinated flowers!
bcoz not all of them reach the stigma....

mmm.... If this is your suggestion then more female , which I thought of . But that is wrong because more pollen will Land on stigma than the number of female gametes inside the ovary of the flowering plant , I think that's reasonable? I dunno, everyone has his own thinking .

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

mmm.... If this is your suggestion then more female , which I thought of . But that is wrong because more pollen will Land on stigma than the number of female gametes inside the ovary of the flowering plant , I think that's reasonable? I dunno, everyone has his own thinking .

yeahp may be...