1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Natali [406]
4 years ago
11

If a crystal of potassium permanganate is placed on agar and after 15 minutes the diameter of the area over which the dye has sp

read is 15 mm, the average diffusion rate is
Biology
1 answer:
Vadim26 [7]4 years ago
7 0

Answer:

Diffusion rate is 1.96 × 10^{-3} cm^{2}/s

Explanation:

Diffusion is the process in which the molecules of a substance propagates from a region of higher concentration to region of lower concentration through a semi-permeable membrane.

diffusion rate = \frac{area}{time}

Given that; diameter = 15 mm, time = 15 minutes.

The dye spread in a circular form, so that;

area = \pir^{2}

r = \frac{diameter}{2} = \frac{15}{2} = 7.5 mm = 0.75 cm

area = \frac{22}{7} × (0.75)^{2} = 1.7679 cm^{2}

time = 15 minutes = 15 × 60 = 900 seconds

So that;

diffusion rate = \frac{1.7679}{900}

                      = 0.0019643 cm^{2}/s

Diffusion rate is 1.96 × 10^{-3} cm^{2}/s

You might be interested in
Describe cynodonts. What is their place in the evolution of mammals?
Brrunno [24]
<span>Mammals are advanced synapsids, animals distinguished by having extra openings in the skull behind the eyes; this opening gave the synapsids stronger jaw muscles and jaws (the jaw muscles were anchored to the skull opening) than previous animals. Synapsids include the mammals, and their ancestors, the pelycosaurs, therapsids, and cynodonts. Pelycosaurs (like Dimetrodon and Edaphosaurus) were early synapsids, they were mammal-like reptiles. Later synapsids include the therapsids and the cynodonts (with multicusped post-canine teeth; they lived from the late Permian through the Triassic period). The cynodonts led to the true mammals. Over time, the synapsid gait became more upright and tail length decreased</span>
6 0
3 years ago
URGENT!!!
vitfil [10]

Answer:

<h3>Peripheral nervous system</h3>

The peripheral nervous system (PNS) is divided into the somatic nervous system and the autonomic nervous system. The somatic nervous system (SoNS) is the part of the peripheral nervous system associated with the voluntary control of body movements via skeletal muscles.

6 0
3 years ago
Which of the following is a renewable source of energy? A. oil B. natural gas C. wind D. coal​
Alex73 [517]

Answer: Wind

Explanation:

A renewable source of energy won't be artificial or man- made. It's energy that won't run out.

3 0
2 years ago
Read 2 more answers
Write an esaay on origin of species​
LenKa [72]
Do you have the options?
7 0
3 years ago
A new antibiotic is produced that inhibits the synthesis of acetyl-CoA and the electron transport chain in bacteria. For each gl
meriva

Answer:

36 ATPs

Explanation:

Cellular respiration starts with glycolysis wherein glucose is broken down into two molecules of pyruvate. The process of glycolysis forms two molecules of ATP by substrate-level phosphorylation for each glucose molecule. Both pyruvate molecules are converted into acetyl CoA to enter into the Kreb's cycle. Kreb's cycle forms two ATP molecules by substrate-level phosphorylation. NADH and FADH2 formed during glycolysis and Kreb's cycle are oxidized by the electron transport chain. This process also forms as many as 34 ATP molecules. If acetyl CoA is not formed, the total ATP gain per glucose will be only 2 ATP molecules (from glycolysis only) which is 38-2= 36 less than the total.

3 0
3 years ago
Other questions:
  • Question 7 (1 point)
    5·1 answer
  • When viewing an ap projection of the upper cervical spine open mouth technique you notice that the base of the skull is superimp
    13·1 answer
  • Which of the following is a requirement for a population to be in Hardy-Weinberg equilibrium? A.Immigration must outpace emigrat
    13·2 answers
  • A rabbit is scurrying away from an approaching hawk Which part of cellular
    9·2 answers
  • Precipitation is an example of what type of reaction
    9·1 answer
  • What can affect the properties of substance?
    14·2 answers
  • Which phrase describes the policy that guided how the British ruled the American colonies during most of the colonial period?
    8·1 answer
  • What part in the us would a hurricane most likely strike
    10·2 answers
  • What happens after the gated channels close?
    14·1 answer
  • I need help answering this question
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!