Answer:
It is exothermic in nature.
Explanation:
(1) The reaction is exothermic in nature because it releases heat energy.
(2) Yes, the temperature of the water go up as the reaction releases heat energy and the temperature cool down as the heat energy is completely removed from the water.
(3) The piston move in when the pressure in the cylinder decreases and the piston move out when increase of pressure occur.
(4) As the outside movement of piston occurs, so we can say that the gas mixture does work on its surroundings.
(5) The system released 244 kJ of energy, in which only 150 kJ went into the water, then the difference must be the work done by the system on its surroundings.
W = (244 - 150) kJ = 94 kJ
The ones on left are the reactants
Answer:
Part 1: Sodium and Rubidium.
Part 2:
<u>Protons</u> = 12
reason: protons are equal to the atomic number of an atom. For Magnesium, atomic number is 12.
<u>Neutrons</u><u>:</u><u> </u>
reason: neutrons is given by formula:
where mass number of magnesium is 24.
<u>electrons</u><u>:</u><u> </u>= 12 electrons
reason: Magnesium atom has electrons summing up to 12
Answer:
+5
Explanation:
The oxidation number of phosphorus can be obtained as follows:
H4P2O7 = 0
4(+1) + 2P + 7(—2) = 0
4 + 2P —14 = 0
Collect like terms
2P = 14 — 4
2P = 10
Divide both side by 2
P = 10/2
P = +5
The oxidation number of phosphorus is +5
