TutorMe homepage
Subjects
PRICING
COURSES
SIGN IN
Start Free Trial
Yair M.
Teacher
Tutor Satisfaction Guarantee
Chemistry
TutorMe
Question:

Which one of the following is the weakest acid? A) HF (Ka = 6.8 × 10-4) B) HClO (Ka = 3.0 × 10-8) C) HNO2 (Ka = 4.5 × 10-4) D) HCN (Ka = 4.9 × 10-10) E) Acetic acid (Ka = 1.8 × 10-5)

Yair M.
Answer:

The answer is D) HCN because it has the lowest Ka value. The Ka value or the acid ionization constant helps determine whether an acid is weak or strong. The Ka value can be thought of like the equilibrium constant and a larger value favors the forward reaction. As a result, a large Ka value will favor the forward reaction which would mean more H+ protons are being formed but a small (but positive) Ka value means it favors the forward reaction but not by much. Therefore, a small Ka value is a weak acid.

Biology
TutorMe
Question:

What organelle supplies the most energy to the cell? A) Cytosol B) Mitochondria C) Endoplasmic Reticulum D) Nucleus

Yair M.
Answer:

The answer is B) because the Cytosol is not an organelle. The remaining answer choices are B, C, and D. The Endoplasmic Reticulum is involved in protein synthesis but does not make ATP (the primary energy source for cells). The Nucleus contains the genetic information for the cell and does not provide energy to the cell. Cellular respiration takes place in the Mitochondria and ATP is formed.

Algebra
TutorMe
Question:

Solve for X: 1/5X+1/3X=1

Yair M.
Answer:

When approaching this kind of problem, I would first make the problem easier by removing the fractions. By multiplying each number by a number that both fractions share in common. 1/5X (times 15) + 1/3X (times 15) = 1 (times 15) This should result in: 3X+5X=15 8X=15 X=15/8=1.875hrs

Send a message explaining your
needs and Yair will reply soon.
Contact Yair
Ready now? Request a lesson.
Start Session
FAQs
What is a lesson?
A lesson is virtual lesson space on our platform where you and a tutor can communicate. You'll have the option to communicate using video/audio as well as text chat. You can also upload documents, edit papers in real time and use our cutting-edge virtual whiteboard.
How do I begin a lesson?
If the tutor is currently online, you can click the "Start Session" button above. If they are offline, you can always send them a message to schedule a lesson.
Who are TutorMe tutors?
Many of our tutors are current college students or recent graduates of top-tier universities like MIT, Harvard and USC. TutorMe has thousands of top-quality tutors available to work with you.