Look at the two thermometers.
2 answers:
Answer : The correct option is, Thermometer A, because it measures accurately to the tenths digit.
Explanation :
Accuracy : It is defined as 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 48 kg and another person weighed 55 kg. Then, the weight measured by first person is more accurate.
Precision : It is defined as the closeness of two or more measurements to each other.
For Example : If you weigh a given substance five times and you get 1.8 kg each time. Then the measurement is said to be precise.
The level of precision is determined by the maximum number of decimal places.
As we are given that the measurement of the temperature of a liquid at .
From the given thermometer we conclude that, the thermometer A is more appropriate than the thermometer B because in thermometer A there are 10 divisions between the two temperature and the smallest division is, 0.1.
So, the temperature of liquid will be,
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Answer:
Explanation:
Translated:
Calculate the amount of sugar (C12 H22 O11) in the morning tea if a teaspoon contains 5g of sugar?
Given parameters
Mass of sugar = 5g
Unknown:
Amount of the sugar =?
Solution:
A mole is the amount of substance that contains avogadro's number of particles i.e 6.02 x 10²³
Therefore, to find the number of moles contained in the teaspoon of sugar we use the expression below:
Number of moles =
Molar mass of C₁₂H₂₂O₁₁ = (12x12) + (1x22) + (16x11) = 342g/mol
Number of moles = = 0.015mol of sugar
or 0.015 x 6.02 x 10²³, 8.8x10²¹atoms of sugar