1) Consider this row in the periodic table. What changes can you predict based on what information is provided by the boxes for
each element?
A) The elements change from solids to gases and the valence electrons decrease in number.
B) As you move across the row, the number of electrons increases and reactivity also increases.
C) They have different atomic numbers and mass numbers; they have the same number of valence electrons.
D) Both the atomic numbers and the mass numbers increase; the least reactive element is in the last box.
USA test prep question
A) The elements change from solids to gases and the valence electrons decrease in number.
B) As you move across the row, the number of electrons increases and reactivity also increases.
C) They have different atomic numbers and mass numbers; they have the same number of valence electrons.
D) Both the atomic numbers and the mass numbers increase; the least reactive element is in the last box.
USA test prep question
1 answer:
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Answer:
i) 0,7 molH20/s
ii)11,2 g O/s
iii)1,4 g H/s
Explanation:
i) To find the molar flow rate of water, we just convert the mass of water to moles of water using its molecular weight(g/mol) and changing to the proper units (lb to grames and hours to seconds):
ii) Now we just consider the oxygen in the water stream (for 1 mole of water there is 1 mole of oxygen):
iii)Just considering the hydrogen in the stream (for 1 mole of water there is 2 moles of hydrogen):
Explanation:
It is known that for high concentration of , reduction will take place. As, cathode has a positive charge and it will be placed on left hand side.
Now, = 0 and the general reaction equation is as follows.
3.00 M n = 2 30 mM
E =
=
= 0.038 V
Therefore, we can conclude that voltage shown by the voltmeter is 0.038 V.