Phytoplankton are microscopic photosynthesizing organisms that typically live in the upper layers of the ocean. What trophic level do phytoplankton belong to?Primary producers
Decomposers
Primary consumers
Secondary producers

Answers

Answer 1

Answer:

Answer: Primary producers

A food chain is a linear series of transfer of food and energy when one organism is consumed by the other organism in an ecosystem. The energy is distributed among different tropic levels of the food chains.

Phytoplankton is a class of unicellular simple, autotrophic organisms which are found in water of ocean, lakes and or any other freshwater body. These includes dinoflagellates, diatoms, cynobacteria, green algae and others. These organisms are abundantly present in the ecosystem in the lower most trophic level. They are called as primary producers because they are consumed by other organisms such as zooplanktons, fishes and large sea mammals.

Answer 2

Answer: i think they are primary producers, as they produce biomass from inorganic compounds (CO2)

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How many protons, electrons, and neutrons does the following isotope contain? 40 Ar

Answers

The isotope 40Ar contains 18 protons, 18 electrons, and 22 neutrons.

The isotope 40Ar refers to the isotope of argon, which has an atomic number of 18.

Since the atomic number represents the number of protons in an atom, we can conclude that the isotope 40Ar contains 18 protons.

Argon is a neutral atom, so the number of electrons also matches the number of protons. Therefore, the isotope 40Ar contains 18 electrons.

To find the number of neutrons, we need to subtract the atomic number (protons) from the mass number (protons + neutrons). The mass number of 40Ar is 40. Subtracting the atomic number of 18 from the mass number gives us:

Number of neutrons = Mass number - Atomic number

Number of neutrons = 40 - 18

Number of neutrons = 22

Therefore, the isotope 40Ar contains 18 protons, 18 electrons, and 22 neutrons.

Learn more about atomic number from the link given below.

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Answer:

18 protons, 18 electrons, 22 nuetrons

Explanation:

Argon has an atomic # of 18. Atomic #s show the amount of protons and electrons it has. Atomic mass - atomic # = # of nuetrons. 40-18=22

Which type of bonding involves positive ions immersed in a sea of mobile electrons?

Answers

The answer is a metallic bond. This type of bond is considered to be a lattice of positive ions immersed in a sea of electrons. Common features of materials with metallic bonds are being a good electrical and thermal conductors, opaque and are ductile.

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. What other characteristic does the radiation have?some shielding required
no mass
large mass
high penetrating power

Answers

The radiation emitted is a beta particle with a -1 charge. Beta particles have a medium penetrating power. An emission of beta particles requires shielding because of the hazards it pose to humans. Thus, one characteristic of this radiation is that some shielding is required.

Answer: A) Some shielding required

Explanation:

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Which definitions of acids can apply to substances?

Answers

*Acids taste sour. The lemon, vinegar, tamarind contain acids; that's why they are sour.

*The acids change the color of certain substances called indicators. The indicators have the property of changing color as the character acid or basic solutions. The litmus and phenolphthalein are indicators of acids and bases. The solution of phenolphthalein is colorless red in the presence of an acid. Already the blue litmus paper turns red.

*The acids react with bases to form salts and water. This reaction is called neutralization reaction.
hope this helps!

A substance that can donate a pair of electrons to form a covalent bond is known as a(n) _____ base.

Answers

Answer : A substance that can donate a pair of electrons to form a covalent bond is known as a(n) Lewis-base.

Explanation :

According to the Lewis acid-base theory,

Lewis acid : It is a substance that can accepts pairs of electrons to form a covalent bond.

Lewis-base : It is a substance that can donates pairs of electrons to form a covalent bond.

For example :

$H^++OH^-\rightarrow H_2O$

In this reaction, $H^+$ ion is Lewis-acid and $OH^-$ ion is a Lewis-base. The $OH^-$ ion donates electrons to $H^+$ ion to form $H_2O$ .

Hence, a substance that can donate a pair of electrons to form a covalent bond is known as a(n) Lewis-base.

A substance that can donate a pair of electrons to form a covalent bond is known as a Lewis base. It is any substance that can donate a pair of nonbonding electrons. The Lewis theory suggests that acids react with bases to share a pair of electrons with no change of oxidation numbers of any atoms.

What causes the colors observed during a flame test

Answers

By using flame test we can identify the elements because colors which are given by elements with flame test are unique.

During the flame test, the electrons of the atom which are in ground state absorb energy and go to upper level. This is called electron excitation. Excited electrons are unstable. Hence, they come back to the ground state by emitting the energy as photons.If that released energy has a frequency which belongs to visual light, then that wave gives a color.

The colors observed during a flame test are caused by the presence of certain metal ions. When these metal ions are heated by a flame, the electrons in their outer energy level get excited and move to higher energy levels. As they return to their original energy levels, they release energy in the form of light, which we perceive as different colors.

During a flame test, the colors observed are caused by the presence of certain metal ions. When these metal ions are heated by a flame, the electrons in their outer energy level get excited and move to higher energy levels. As they return to their original energy levels, they release energy in the form of light, which we perceive as different colors.

For example, when a copper compound is heated, it emits a green color. This is because copper ions are responsible for this color. Different metal ions will emit different colors, allowing us to identify them by their characteristic flame color.

Therefore, the colors observed during a flame test are a result of the specific metal ions present in the substance being tested.