Answer:
A.
Explanation:
In an endothermic reaction heat is applied.
The earth revolves around the Sun, which is at the centre of our solar system. The moon revolves around the earth as a natiral satellite.
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Answer:
Final Volume = 0.31L
Explanation:
Initial volume V1 = 1L
Initial pressure P1 = 150kPa
Initial temperature, T1 = 25'C + 273 = 298K
Final Pressure P2 = 600kPa
Final Temperature T2 = 100'C + 273 = 373K
Final Volume V2 = ?
The combined gas law is given as;
P1V1 / T1 = V2P2 / T2
150 * 1 / 298 = V2 * 600 / 373
V2 = 55950 / 178800 = 0.31L
This would be answer choice C. the rate constant changes over time
Answer:
3.97
Explanation:
pH of buffer solution = pKa+Log(Cb/Ca)
pH of buffer solution = -log(Ka)+log(Cb/Ca)............... Equation 1
Where Ca = concentration of acid, Cb = concentration of base.
Given: Ka = 6.5×10⁻⁵, Ca = 0.25 M, Cb = 0.15 M
Substitute into equation 1
pH of buffer solution = -log(6.5×10⁻⁵)+log(0.15/0.25)
pH of buffer solution = 4.19+(0.22)
pH of buffer solution = 3.97.
