The periodic table was arranged by Mendeleev in the increasing order of atomic numbers. The arrangement sees to it that the elements belonging to the same column has similar properties and the rows are arranged in increasing number of valence electrons. The answer here is true.
Answer:
700,000 holes
Explanation:
When heat energy occurs to produce free electrons, the number of free electrons produced is directly proportional and equal to the number of holes it produces at that time.
Hence, if silicon crystal (pure) has 700,000 free electrons, then the number of holes it have is also 700,000.
The first is focus the second is fault the third is epicenter
Answer:
5 g of H₂ are contained in the vessel
Explanation:
A typical excersise of conversion:
We determine molar mass of H₂.
This is a dyatomic molecule, as molar mass of H is 1g/mol, molar mass of H₂ will be 2g/mol.
Let's make the conversion of units:
2.5 mol . 2g/mol = 5 g
5 g of H₂ are contained in the vessel
Answer : The final volume of the gas is, 34.8 L
Explanation :
Formula used :
where,
w = work done = 137.1 J = 35.8 L.atm (1 L.atm = 101.3 J)
p = external pressure = 783 torr = 1.03 atm (1 atm = 760 torr)
= final volume = ?
= initial volume = 64.0 mL = 0.0640 L (1 L = 1000 mL)
Now put all the given values in the above formula, we get:
Thus, the final volume of the gas is, 34.8 L
