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
Stolb23 [73]
4 years ago
14

Chemist runs a thin–layer chromatography (tlc) plate and, after development, notices that all of the spots are at the upper regi

on of the tlc plate and are very close together. Select the most likely cause of this result.
Biology
1 answer:
natulia [17]4 years ago
6 0

Answer;

An ineffective developing solvent was used.

Explanation;

-Quick elution and poor separation are indicative of the compounds traveling quickly up the plate and not interacting sufficiently with the stationary phase.

-Chromatography works on the principle that different compounds will have different solubility and adsorption to the two phases between which they are to be partitioned. Thin Layer Chromatography (TLC) is a solid-liquid technique in which the two phases are a solid (stationary phase) and a liquid (moving phase).

You might be interested in
Which bond is the most polar?<br> H C<br> N= N<br> O H
jenyasd209 [6]

O-H bond is referred to as the most polar.

Explanation:

O-H bond is said to be most polar because the electronegativity is different. Electronegativity can be said as the atom's ability to attract electrons towards itself. Electronegativity of an atom increases when there is a movement on the periodic table from left to right.

When the electronegativity between the atoms are different then it is said to be a polar bond on the other case if the electronegativity between the atoms are same it is said to be non- polar bonds.

4 0
4 years ago
The transfer of thermal energy by convection is a very important process in the temperature distribution of the Surface of the E
Arada [10]

as you see you got this problem wrong becuase Its c :)



btw i got same question are we on same schools lol


4 0
3 years ago
What is coconut water from tender coconut?​
anygoal [31]

Explanation:

Coconut water is the clear liquid found inside immature coconuts. As the coconut matures, the water is replaced by coconut meat. Coconut water is sometimes referred to as green coconut water because the immature coconuts are green in color. Coconut water is different than coconut milk.

Tender coconut water is a wholesome, nutritious drink. ... The water of tender coconut, technically the liquid endosperm, is the most nutritious wholesome beverage that the nature has provided for the people of the tropics to fight the sultry heat. This type is 90 to 95 percent water.

4 0
3 years ago
The largest groups into which living things are classified are called
Free_Kalibri [48]
The largest groups into which living things are classified are called kingdoms
8 0
4 years ago
Read 2 more answers
The reproductive cycle in females is regulated primarily by
madreJ [45]
The reproductive cycle in females is regulated primarily by HER HORMONES.  Five hormones to be exact. These hormones are Estrogen, Progesterone, Luteinizing hormone (LH), follicle stimulating hormone (FSH), and gonadotropin releasing hormone.

Estrogen is from the ovaries. It helps regulate the menstrual cycle. It promotes the rapid growth of cell linings in the uterus to prepare for implantation resulting to pregnancy.

Progesterone is also from the ovaries. It is produced after ovulation and maintains the health of the lining within the uterus during pregnancy. If no pregnancy occurs, the progesterone level decrease and results to menses or monthly period.

Gonadotropin Releasing Hormone is secreted by the brain as a result of the hormonal changes that occur every month. It in turn stimulates the production of FSH and LH.

FSH stimulates the follicles inside the ovaries increase the amount of estrogen and progesterone produced in the first two weeks of the menstrual cycle.

The increase in estrogen level by FSH prompts the pituitary glands to release LH. Luteinizing hormone then signals the dominant follicle, made by FSH inside the ovaries, to release its eggs for possible fertilization.




8 0
3 years ago
Read 2 more answers
Other questions:
  • You are a teaching assistant for an introductory biology laboratory. you would like your students to see connections between adm
    8·1 answer
  • In a temperate region just north of the U.S.-Mexico border, environmentalists observe a recent influx of aphids into grasslands,
    9·1 answer
  • You are an epidemiologist in charge of county health services for low income, HIV positive individuals in NJ. Which data would b
    12·1 answer
  • Why does bacteria create a resistance to penicillin?
    7·1 answer
  • The student wants to know whether using natural compost will cause his tomato plants to grow faster and taller than his artifici
    14·1 answer
  • Please help me out. thanks:)
    15·2 answers
  • By analyzing past episodes of the quiz show, you realize that you will probably need 600 points to defeat Kimberly. You also not
    10·1 answer
  • Suppose that a patient is diagnosed with a new disease caused by the buildup of waste material in the body's cells.
    9·1 answer
  • 3. The picture on the right shows the sequence of nitrogen bases on part
    8·1 answer
  • Photosynthesis takes place in two separate but dependent series of steps:
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!