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Physics, Chemistry and Biology: Post your doubts here!
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can someone please tell me where i can either get downloaded version of cie igcse chemistry biology and physics guide? Thank You!
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hi
if in chemistry we r being asked to test for pure water , so here do they mean physical or chemical test
if in chemistry we r being asked to test for pure water , so here do they mean physical or chemical test
Its really easy. Just tell the melting point and boiling point of water. If the thermometer shows a reading of 0 and 100 degrees celcius respectively, it is pure, otherwise it is impure, as impurities cause the melting point to decrease and boiling point to increasehi
if in chemistry we r being asked to test for pure water , so here do they mean physical or chemical test
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bt hw do we knw if they r askng chemical or physical propeties
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If they ask specifically for a chemical test then only answer with the chemical test. But if they ask just a test for water, give either physical or chemical!
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k thnx
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Does anybody have the topics for igcse English second lang. May/June 2014 speaking test?
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Thanks!
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how to draw the best fit lines for graphs ......
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with pencil!!!
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chose the points and the line should be passing through most of the points
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oh thank god u said that....i was gonna use a glitter pen......
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HHAHAHA lol
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what is a time-delay circuit? can someone please explain.
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but does it have to be like this that the points missed on top n bottom of the line are equal in number
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No the points missed should be equal on the left and right of the line
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Time delay circuits
As it takes a finite time for a capacitor to charge or discharge, they can be used in time delay circuits. A circuit such as shown below can be used as a prt of burglar alarm or temperature sensor.
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Lines of best fit
The 'line of best fit' is a line that goes roughly through the middle of all the scatter points on a graph. The closer the points are to the line of best fit the stronger we can say the correlation is.
Look at the diagrams below:
The line of best fit is drawn so that the points are evenly distributed on either side of the line. There are various methods for drawing this 'precisely', but you will only be expected to draw the line 'by eye'.
You may be asked to comment on the nature of the correlation. This means you will be expected to say whether there is positive, negative or no correlation. Using terms such as 'strong', 'moderate' or 'weak' will give a clearer indication of the strength of the connection.
When drawing the line of best fit, use a transparent ruler so you can see how the line fits between all the points before you draw
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thx broLines of best fit
The 'line of best fit' is a line that goes roughly through the middle of all the scatter points on a graph. The closer the points are to the line of best fit the stronger we can say the correlation is.
Look at the diagrams below:
The line of best fit is drawn so that the points are evenly distributed on either side of the line. There are various methods for drawing this 'precisely', but you will only be expected to draw the line 'by eye'.
You may be asked to comment on the nature of the correlation. This means you will be expected to say whether there is positive, negative or no correlation. Using terms such as 'strong', 'moderate' or 'weak' will give a clearer indication of the strength of the connection.
When drawing the line of best fit, use a transparent ruler so you can see how the line fits between all the points before you draw