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If a partially solid sample that also contains some volatile material is heated, the weight of the sample will decrease because some of the volatile material will be driven into the atmosphere and will not return to the sample is cooled again. If the weight of the sample is recorded after each interval of heating and cooling, eventually the sample will reach a weight that no longer changes upon further heating, indicating that all of the volatile material in the sample has been driven off. This is called heating the sample to constant weight and is often used when analyzing moist solids such as soil or biological materials, water being the volatile material in these instances.
Wiki User
∙ 11y ago
Wiki User
∙ 13y agoThis is an important process in gravimetry - a classic method in analytical chemistry. The role is to obtain reliable results on the basis of definite weighed compound and not depending upon the temperature of heating.
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How many lbs in 1ppm?
PPM describes the amount of a substance in a sample. For example: If you have one million pounds of goo that is 1 part per million (PPM) GOLD, you would have one pound of gold in the million total pounds of goo. PPM is typically used to define how much of a pollutant is in a sample of air. If the sample was determined to be 6 ppm hydrocarbon in a sample, that would mean that of the million moles of the sample of air (the weight of the atoms that make up the sample) there would be 6 moles of the hydrocarbon specified, which, depending on the complexity of the hydrocarbon, could end up being one atom of the hydrocarbon in the sample.
What does CnH2nOn formula mean?
<p>Sample sugar<p>
What does K subscript w mean?
Kw is called the water autoprotolysis constant or water autoionization constant
How would a calorimeter constant be effected if it were made of glass instead of styrofoam?
The Calorimeter Constant is the energy in joules needed to increase the calorimeter container(glass beaker or styrofoam cup) by 1 degree Celsius. Glass has a lower specific heat capacity (J/g)x(Degrees Celsius)than styrofoam. Which means it takes less energy for glass to accumulate or lose heat than it does styrofoam. Therefore a glass calorimeter will have a lower calorimeter constant due to heat(energy) escaping. In a reaction that you're trying to measure change in heat in a solution, a styrofoam cup will hold in the reactions change in heat better and therefore you will be able to calculate the energy absorbed into the cup and add it to the energy calculated in the solutions reaction, while the energy or heat absorbed in the glass will already escaping and so it will be a lesser value(calorimeter constant) that is added to the energy in the solutions reaction..... This was hard to grasp since initially i thought the energy being released from the reaction, into the glass would mean it heats up the glass more than the styro cup, and i thought that it would have more energy to be added to the energy calculated in the reaction
What happens to the heat in a system and in the surroundings in an exothermic reaction?
the system releases heat,meaning that energy is generatered.
How does the addition of a constant and multiplication by a constant affect the arithmetic mean?
If you add the same constant to each element of a sample then the mean of this collection of values will be the mean of the original sample plus the constant. If you multiply each element of a sample by a constant then the mean of this collection of values will be the mean of the original sample multiplied by the constant.
What is the estimd population mean of sample 36 mean weight 3.01 standard diviation 03?
The answer will depend on the population mean of what variable? Height?, length or is it simply weight. If it is weight, the estimated (not estimd) population mean is 3.01 units: the same as the sample mean. The standard deviation (not diviation) is irrelevant.The answer will depend on the population mean of what variable? Height?, length or is it simply weight. If it is weight, the estimated (not estimd) population mean is 3.01 units: the same as the sample mean. The standard deviation (not diviation) is irrelevant.The answer will depend on the population mean of what variable? Height?, length or is it simply weight. If it is weight, the estimated (not estimd) population mean is 3.01 units: the same as the sample mean. The standard deviation (not diviation) is irrelevant.The answer will depend on the population mean of what variable? Height?, length or is it simply weight. If it is weight, the estimated (not estimd) population mean is 3.01 units: the same as the sample mean. The standard deviation (not diviation) is irrelevant.
Is the heat content of a system at a constant pressure?
Yes it is possible, for example when water freezes there is a point when the temperature remains constant however energy is released as the water condenses.
What happens to the sample mean as the sample size increases?
With a good sample, the sample mean gets closer to the population mean.
Does mass remain constant?
Yes, Mass remains constant because the definition of mass does not mean weight. Mass means the amount of room and object takes.
Which will cause an increase in the mean free path for molecules in a sample of gas?
i believe an increase in density at a constant temp would. I have the same homework questions =P
Why wont a sample statistics change from sample to sample?
The sample mean may differ from the population mean, especially for small samples.
When using the distribution of sample mean to estimate the population mean what is the benefit of using larger sample sizes?
The variance decreases with a larger sample so that the sample mean is likely to be closer to the population mean.
A Numerical Measure from a Sample Such as a Sample Mean Is Known?
sample statistic
What is the difference between calculating the sample mean and the population mean?
You calculate the actual sample mean, and from that number, you then estimate the probable mean (or the range) of the population from which that sample was drawn.
When z test is used?
The term Z-test is often used to refer specifically to the one-sample location test comparing the mean of a set of measurements to a given constant.
What is the difference between statistics and parameters?
Parameter is any attribute Statistic are the measured values of a parameter. A statistic is a sample value such as the average height of a group of students. A parameter is a functional constant such as the mean of a normal distribution. Statistics are often used to estimate parameters. For instance, a sample average is an estimate of the mean.
