Answer: -
25%, 5% and 2.5% are the percentage error arising in an experiment when 1-ml, 5-ml, and 10-ml pipette are used for transfer.
Explanation:-
We are told that each pipette contains 5 drops of water adhering to the inside of the barrel.
We are also told that a single drop of water has an approximate volume of 0.05 ml.
Total volume of water adhering to the inside of the barrel = 5 x 0.05
= 0.25 mL
This volume of water adhering to the inside of the barrel is the cause of error in an experiment.
Thus percentage error = 
x 100
For 1 mL pipette,
Percentage error = 
x 100
= 25%
For 5 mL pipette,
Percentage error = 
x 100
= 5%
For 10 mL pipette,
Percentage error = 
x 100
= 2.5%
Answer : The correct option is, (a) 345 K
Explanation :
The conversion used for the temperature from degree Celsius to Kelvin is:
where,
= temperature in Kelvin
= temperature in centigrade
As we are given the temperature in degree Celsius is, 72
Now we have to determine the temperature in Kelvin.
Therefore, the temperature in Kelvin is, 345 K
In most cases, when two elements form a compound, the new compound has a set of chemical properties that are entirely different from its reactants. However, in the case of diatomic compounds, such as O2, then yes, the compound retains the properties of its elemental parts.
Answer:
620.71 L the final volume of the balloon.
Explanation:
Initial volume of the gas in the balloon= 
Initial pressure of the gas in the balloon= 
Initial temperature of the gas in the balloon= 
Moles of gases = n
...[1]
Final volume of the gas in the balloon = 
Final pressure of the gas in the balloon = 
Final temperature of the gas in the balloon = 
Moles of gases = n
...[2]
[1] = [2]
620.71 L the final volume of the balloon.
Answer:
3. small sizes and high ionization energies.
Explanation:
Hello,
Ionization energies are always related with the formation of positive ions. On the other hand, electron affinities are the negative ion equivalent, and their use is almost always confined to elements in groups 6 and 7 of the Periodic Table
Small sizes and high ionization energies turn out into great electron affinities since it is easier for an electron to be added to an atom if it is small and it has a high ionization energy to promote the aforesaid addition.
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