Pb + Mg(NO₃)₂ → Pb(NO₃)₂ + Mg
This reaction would NOT occur because Pb is less reactive than Mg and as such Pb cannot displace the Mg in order for the reaction to occur under normal conditions.
Mg + Fe(NO₃)₂ → Fe + Mg(NO₃)₂
This reaction would occur. This is because Mg is more reactive than Fe and as such can displace it in the reaction, thus allowing the reaction to occur under normal conditions.
Cu + Mg(NO₃)₂ → Cu(NO₃)₂ + Mg
This reaction would NOT occur. Mg is more reactive than Cu, and as such copper cannot displace magnesium in order for the reaction to occur under normal conditions.
The first ionisation energy of silicon is greater than that of phosphorus.
Answer:
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The answers to you questions are 3,66 g of liquid water and 0,84 g of vapor.
Solution:1) Q₁ = mxCxΔT = 4,5 g x 2,108 J/°C x g x 10°C.
= 97,86 J heat required to warm the ice to 0°C.
2) = 4,5 g x 334 J/g. = 1503 J heat required to melt the ice to water at 0°C.
3) = 4,5 g x 4,184 J/°C x g x 100°C
= 1882,28 J heat required to warm the water from 0°C to 100°C. = 5400 J - 3483,14 J = 1916,86 J heat left to vaporize the water.
mass of the vapor= 1916,86 J ÷ 2257 J/g
= 0,84 g.
A) All Nitrogen atoms have 7 protons. - correct answer
Explanation:
You find the nitrogen (N) in the group 15, period 2 of the periodic table. The the atomic number of nitrogen is 7 and from this we deduce that nitrogen have 7 protons and 7 electrons.
A) All Nitrogen atoms have 7 protons. - correct
B) The mass number of Nitrogen is 21. - incorrect, the mass number of nitrogen is 14.
C) All Nitrogen atoms have 14 protons. - incorrect, all nitrogen atoms have 7 protons.
D) Nitrogen atom has more protons than a Fluorine anion. - incorect, fluorine (F) have an atomic number of 9 so it will have 9 protons, which is less than the number of nitrogen protons.
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atomic number
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