Answer:
Im not really sure what a half life is, but two of them would be 5.0 hours
Answer:
A. Distance = 18 m
time = 2 hr
speed = 9 m/hr
Explanation:
Speed is the same thing as velocity.
Velocity = distance/time
18m/2hr = 9m/hr
For choice B, the numbers are right, but the units are mixed (minutes were changed to hours)
explanation:
[NaOH] = 2M
NaOH(aq) <======> Na+(aq) + OH-(aq)
[OH-]=[NaOH]
[OH-] = 2M
<em>From</em><em> </em><em>Kw</em><em> </em><em>=</em><em> </em><em>[OH-]</em><em>[</em><em>H</em><em>+</em><em>]</em>
<em>But</em><em> </em><em>Kw</em><em> </em><em>=</em><em> </em><em>1</em><em>0</em><em>^</em><em>-</em><em>1</em><em>4</em><em> </em><em>mol^2dm^-9</em>
<em> </em><em> </em><em> </em><em> </em><em> </em><em> </em>[H+] = Kw / [OH-]
[H+] = 10^-14 ÷ 2M
[H+] = 5 × 10^-15
pH = -log[H+]
pH = -log 5 × 10^-15
pH = 14.3
Answer:
D
Explanation:
There is know graph that has the information to answer this question.
