<span>Answer: 8.15s
</span><span />
<span>Explanation:
</span><span />
<span>1) A first order reaction is that whose rate is proportional to the concenration of the reactant:
</span><span />
<span>r = k [N]
</span><span />
<span>r = - d[N]/dt =
</span><span />
<span>=> -d[N]/dt = k [N]
</span><span />
<span>2) When you integrate you get:
</span><span />
<span>N - No = - kt
</span>
<span></span><span /><span>
3) Half life => N = No / 2, t = t'
</span><span />
<span>=> No - No/ 2 = kt' => No /2 = kt' => t' = (No/2) / k
</span><span />
<span>3) Plug in the data given: No = 0.884M, and k = 5.42x10⁻²M/s
</span>
<span /><span /><span>
t' = (0.884M/2) / (5.42x10⁻²M/s) = 8.15s</span>
Four electron shells cause both of them are on the 4th period.
Answer:
V2 gas = 2.33 L
Explanation:
assuming ideal gas:
∴ n gas = 1 mol
∴ P1 standard = 1 atm
∴ V1 gas = 3.5 L
∴ P2 = 1.5 atm ⇒ V2 = ?
state 1:
∴ P1V1 = nRT1
⇒ P1V1/T1 = nR
state 2:
⇒ P2V2/T2 = nR
(1) = (2)
⇒ P1V1/T1 = P2V2/T2
assiming: T1 = T2
⇒ P1V1 = P2V2
⇒ V2 = P1V1/P2
⇒ V2 = ((1 atm)(3.5 L))/(1.5 atm)
⇒ V2 = 2.33 L
4) their metallic properties increase and their atomic radii increase.
Answer:
The force of gravity is inversely related to the distance the alien is from Earth; this means that force of gravity decreases as the distance between the alien and Earth increases. As the distance between the alien and the surface of the planet increases, the force of gravity decreases.
Explanation:
