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
blsea [12.9K]
3 years ago
6

Sam wished to investigate how fertilizer run-off affects the growth of algae in freshwater lakes and streams. He set his experim

ent up in this way. He placed
900 ml of water into each of five 1000 ml glass beakers. To each beaker he added 5 ml of water from an aquarium which contained a large concentration of
algae. The beakers were placed under a grow light which was timed to provide 12 hours of light each day. Liquid fertilizer was added to the beakers in the
following amounts: Beaker A-8 mi fertilizer, Beaker B - 6 ml fertilizer, Beaker C - 4 ml fertilizer, Beaker D-2 mi fertilizer, and Beaker E - no fertilizer. Each
week a random sample from each of the beakers was examined under a microscope to get a count of the number of algal cells present.
What is the independent variable in this experiment?
O hours of daylight
O amount of water
O amount of fertilizer
O number of algal cells
Chemistry
1 answer:
MrMuchimi3 years ago
8 0

Answer:

amount of fertaliser--> the independant variable is the one being changed

You might be interested in
Is It Deadly To Mix Bleach, Rubbing Alcohol, And/or Hydrogen Peroxide?
Oduvanchick [21]
Mixing bleach with rubbing alcohol and/or hydrogen peroxide can run the risk of producing chlorine gas. This is a gas that if inhaled in excess, or at all, is extremely dangerous, harmful or even fatal. Keeping this in mind, it is therefore not recommended that you mix these substances together. The label of your rubbing alcohol will recommend any substances it can or cannot be mixed with.
4 0
3 years ago
Read 2 more answers
Why amino acids are soluble in pH=3 or pH=10 solutions more than it dissolves in pH=7 solutions?
Ray Of Light [21]

Answer:

Solubility is Affected by pH

The pH of an aqueous solution can affect the solubility of the solute. By changing the pH of the solution, you can change the charge state of the solute.

At pH extremes, the amino acid molecules mostly carry a net charge, thus increasing their solubility in polar solvent. At very low or very high pH, the amino acid molecules have increased charge, thus form more salt bonds with water solvent molecules.

An isoelectric point is the pH at which an amino acid exists as its zwitterion. A zwitterion is the dipolar ionic form of an amino acid. ... If the pH is lower (in acidic conditions) than the isoelectric point then the amino acid acts as a base and accepts a proton at the amino group. This gives it a positive change.

An amino acid is usually more soluble in aqueous solvent at pH extremes than it is at a pH near the isolelectric point of the amino acid. (Note that this does not mean that the amino acid is insoluble at a pH near its pI.)

Which of the following statements correctly explains this phenomenon?

(Select all that apply.)

The neutral charge of an amino acid molecule at its isoelectric point will make the molecule hydrophobic.

At pH extremes, the amino acid molecules mostly carry a net charge, thus increasing their solubility in polar solvent.

At very low or very high pH, the amino acid molecules have increased charge, thus form more salt bonds with water solvent molecules.

At pH values far from the isoelectric point, individual amino acid molecules have greater kinetic energy, thus more readily stay in solution.

<h2>Please mark me as brainliest</h2>

8 0
3 years ago
Describe the Earth's layers in relation to density
jok3333 [9.3K]
<span>Our Earth is structured around the densities of the materials which make it up.One property of density is that it determines the way materials in a mixture are sorted. This property of matter results in the layering and structure of Earth's atmosphere, water, crust, and interior.</span>
7 0
3 years ago
How are volcanic mountains formed?
astra-53 [7]

Answer:

Volcanic mountains form as lava oozes forth from cracks in the earth. The lava builds up around the area where the eruption occurred. Layers build upon layers and over a period of time, a volcanic mountain forms. There are several ways that volcanic mountains are formed. Shield volcanoes, which are very wide with a gentle slope, are formed by long periods of eruption with low-viscosity lava.

Explanation: Hoped this helped! :)

5 0
3 years ago
Read 2 more answers
What is a simple definition of atom, particle, and kinetic?
JulsSmile [24]

Answer:

Atom: The smallest particle of an element that has the properties of the element and can exist either alone or in combination.

Particle: One of the very small parts of matter (as a molecule, atom, or electron)

Kinetic: Of or relating to the motions of material bodies and the forces and energy associated with them

Explanation:

4 0
3 years ago
Other questions:
  • Consider the incomplete reaction below.
    5·1 answer
  • What is the ph of a 2.7 m solution of hclo4?
    10·1 answer
  • How many atoms of zinc are in 450 grams of zinc?
    14·1 answer
  • Which of the following processes is responsible for producing large amounts of snow in Buffalo, New York? A.) mountain lift effe
    10·2 answers
  • Elements with similar properties are located
    14·1 answer
  • What makes a theory scientific? this is for earth and space science .
    11·1 answer
  • Calculate the work done when a force of 500N moves an object 20m. and (B) if it
    7·1 answer
  • ASAP<br>what is an electron cloud ​
    15·1 answer
  • Explain why there would be an environmental problem if sulfur dioxide gas escaped into the atmosphere
    10·1 answer
  • What is metallic conductivity ?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!