Answer:
Explanation:
a ) The temperature of water increases from 21.3°C to 48.4°C .
b ) Heat flow of water ( q) is positive because there is rise in temperature .
c ) The temperature of metal decreases from 99.3⁰C to 48.4⁰C .
d ) Heat flow of metal is negative because there is fall in temperature .
e ) heat loss of metal = heat gain by water
heat gain by water ( q ) = 50 x 4.2 x ( 48.4 - 21.3 )
= 5691 J
q = 5690 J . ( 3 significant figures )
heat loss of metal = mass x specific heat x fall in temp = 5691
150 x specific heat x ( 99.3 - 48.4 ) = 5691
specific heat = 5691 / (150 x 50.9 )
= .745 J / g C ( three significant figures )
The absorbance of the 214 mm solution of nickel(ii) chloride can be obtained by fitting it into the regression line of the calibration curve.
<h3>What is a calibration graph?</h3>
During measurements of the concentration of a solution using a spectrophotometer, it is conventional to first calibrate the instrument. The calibration is done by measuring the absorbance of various concentrations of the test solution after measuring the absorbance of the sample blank.
After the instrument has been calibrated, the absorbance of any test solution can now be obtained by fitting it into the regression line of the calibration curve.
Learn more about a spectrophotometer:brainly.com/question/18801845
Well first you need to know what a mixure is. A mixture must be made of two or more elements or compounds. There are several ways to seperate a mixture, that is, to isolate each substance (element or compound). You can do this with melting point (i.e. a block of aluminum and iron that have been melted, mixed and then cooled. To seperate the Al from the Fe, you can start to melt it. The Al melts at a much lower temp than the Fe, and therefore will liquify before Fe.)
Answer:
You know that a chemical reaction has taken place because there is a material a color change.
Explanation: