Answer: The student’s values are accurate as well as precise.
Explanation:
Precision refers to the closeness of two or more measurements to each other.
For Example: If you weigh a given substance three times and you get same value each time. Then the measurement is very precise.
Accuracy refers to the closeness of a measured value to a standard or known value.
For Example: If the mass of a substance is 50 kg and one person weighed 49 kg and another person weighed 48 kg. Then, the weight measured by first person is more accurate.
Given: Mass = 5.000 g
Mass weighed by A has values 4.891 g , 4.901 g and 4.890. Thus the average value is 
Thus as the measured value is close to the true value, the student’s values are accurate and as the values are close to each other, the measurement is precise.
Answer:
Neither accurate nor precise
Explanation:
The values were not near or even the same as the accepted value thus making it neither accurate nor precise.
Answer:
k
Explanation:
that is shide rong and shide right
Answer: Option (a) is the correct answer.
Explanation:
Enthalpy is defined as the total amount of heat present in a system.
When there is bond formation in a chemical reaction then it means energy is released. Hence, the reaction is exothermic in nature and 
< 0 or negative.
On the other hand, when breaking of bonds occurs then energy is absorbed by the system. Hence, the reaction is endothermic in nature and > 0 or positive.
Thus, in the given reaction 
, the state is changing from liquid to solid.
This means atoms are coming close to each other and hence, there is occurrence of bond formation. As a result, energy will be released to the surroundings.
Hence, we can conclude that H < 0 for the given reaction.
Answer:
A photon of energy ℏω is used to excite an electron from some initial state with energy ... by measuring the wavelength dependence of the excitation further from the ... Figure 5 shows PEEM images of 10-μm gold islands on a tantalum substrate ... with an X-ray–focusing monochromator is used to obtain a high-power X-ray.
Explanation:
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