Physics, Chemistry and Biology: Post your doubts here!

Muaaz Iqbal

Muaaz Iqbal

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chemistry problem
A question came to draw two straight intersecting lines
You guys are having any idea how to do that
 
Saad the Paki

Saad the Paki

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Mr.Physics said:
Does calcium make a precipitate in ammonia solution (NH4) ?? In marks scheme it is written that faint ppt but in my book it is written that it doesn't make any ppt .
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both are acceptable... It depends on the volume / concentration etc etc..
But usually theres no ppt
(Not a 100% sure tho)
 
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DANISH182

DANISH182

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My Name said:
The answer should always be according to the marks mentioned. Anyway, this is how it goes...
There are three diagrams in the question.The retort stand to fix the beaker of water,the balance to measure the amount of water and thermometer to measure the temperature.

By using the balance has same of both the fuels so that you're test is fair.
First measure the initial temperature of the water using a thermometer.
Fix the beaker of water in the retort stand and place the fuel under it.
Then burn the fuel and record the temperature of water.
Repeate the experiment with the other fuel and the fuel that gives the greatest rise in temperature( for a period of time) produces more energy.
(In other words it would be a better fuel.)

Take a look at the mark scheme to make sure all points have been covered.If you wish to add a diagram you can draw like this(pic below...just that the test tube would be a beaker of water) and write the steps.
View attachment 53317
Hope that helps :)
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how to fix a beaker at a retord?
 
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