Answer:
B.
Explanation:
The two reactions shown in the attached image depicts the processes of photosynthesis and cellular respiration. Photosynthesis is the process whereby autotrophic organisms use CO2 (carbon dioxide) and H2O (water) in the presence of sunlight to make glucose (C6H12O6). The equation is as follows:
6CO2 + 6H2O + sunlight → C6H12O6 + 6O2
On the contrary is the process of cellular respiration, which involves the breakdown of glucose (sugar) in order to release energy (ATP). The equation is as follows:
C6H12O6 + 6O2 → 6CO2 + 6H2O + energy
According to this question, the option B which says that "Sugar is broken down to release energy" is CORRECT.
The answer is:
C) Sound is a mechanical wave and needs a medium to travel through while light is an electromagnetic wave.
Proton mass = 1.00728 amu
neutron mass = 1.0086 amu
electron mass = 0.000549 amu
so the mass is :
(7 * 1.00728) - (7 * 1.0086) - (7 * 0.000549) - 14.003074
= 0.11235 amu
Answer : The concentration of [CoCl₄]²⁻ is,
Explanation :
Using Beer-Lambert's law :
where,
A = absorbance of solution = 0.935
C = concentration of solution = ?
l = path length = 0.71 cm
= molar absorptivity coefficient =
Now put all the given values in the above formula, we get:
Therefore, the concentration of [CoCl₄]²⁻ is,
-20.16 KJ of heat are released by the reaction of 25.0 g of Na2O2.
Explanation:
Given:
mass of Na2O2 = 25 grams
atomic mass of Na2O2 = 78 gram/mole
number of mole =
=
=0. 32 moles
The balanced equation for the reaction:
2 Na2O2(s) + 2 H2O(l) → 4 NaOH(aq) + O2(g) ∆Hο = −126 kJ
It can be seen that 126 KJ of energy is released when 2 moles of Na2O2 undergoes reaction.
similarly 0.3 moles of Na2O2 on reaction would give:
=
x =
= -20.16 KJ
Thus, - 20.16 KJ of energy will be released.