Answer:
pH = 2.66
Explanation:
weak acid:
∴ Ka = 5 E-5 M = [H+][A-]/[HA]
∴ [HA] = 0.10 M - [A-]
∴ [H+] = [A-]
⇒ Ka = [H+]²/(0.10 - [H+])
⇒ [H+]² + 5 E-5[H+] - 5 E-6 = 0
⇒ [H+] = 2.211 E-3 M
⇒ pH = - Log [H+]
⇒ pH = 2.6553
Answer:
<h2>The answer is 870 miles</h2>
Explanation:
The distance covered by an object given it's velocity and time taken can be found by using the formula
<h3>distance = velocity × time </h3>
From the question
velocity = 290 miles/hour
time = 3 hours
The distance between the two cities is
distance = 290 × 3
We have the final answer as
<h3>870 miles</h3>
Hope this helps you
The correct answer should be D. can be real or virtual depending on the object's placement
Depending on the position on the mirror, it can be determined whether the object is real or virtual.
Answer: <u>Mixtures can be physically separated but pure substances cannot be physically separated.</u>
Explanation: Mixtures can be physically separated by using methods that use differences in physical properties to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography. A pure substance, any compound or element, can't be separated into different atoms by physical methods. Pure substances are compounds and elements (made up of the same atom or same molecule respectively), while mixtures are an assortment of different substances put together. Hope this helps ^-^.
Answer:
original activity is 3600 cpm
Explanation:
3 half-lives = 450 cpm
2 half-lives = 900 cpm
1 half-life = 1800 cpm
answer = 3600 cpm