CHEMISTRY HIGH SCHOOL

Each level of energy transfer in an ecosystem or food chain is called a(n) trophic level

energy level

consumer level

food level

Answers

Answer 1
Answer: The correct answer is the first option. Each level of energy transfer in an ecosystem or food chain is called a trophic level. It comprises organisms that share the same function in the food chain in relation to the primary sources of energy.
Answer 2
Answer: The correct option is the first one 

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Which subctant will not conduct electricity a Aluminium b copper c plastic d steel​

Answers

Answer:

plastic

Explanation:

plastic doesn't conduct electricity

The body gets rid of lactic acid in a chemical pathway that requires ___________. A. carbon dioxide . B. oxygen . C. amino acids . D. hydrogen

Answers

The body gets rid of acid in a chemical pathway that requires oxygen. The correct answer is B, oxygen. 

the answer is b, oxygen! :)

What volume of a 5.0% (v/v) Acetic Acid solution will contain 40.mL of Acetic Acid?

Answers

5.0% ( V/V) :

5.0 mL ------------- 100 mL ( solution )
40 mL --------------- ? ( solution )

V = 40 . 100 / 5.0

V = 4000 / 5.0

V = 800 mL

hope this helps!

At standard pressure, the total amount of heat required to completely vaporize a 100. gram sample of water at its boiling point is(1) 2.26 X 10 J (3) 2.26 X 103 J(2) 2.26 X 102 J (4) 2.26 X 105 J

Answers

During phase transformation Temperature remains same, as the extra heat goes into breaking the force of attraction between the particles. the correct option is option (4) that is 2.26×10⁵ J.

What is heat of vaporization?

Heat of vaporization is the amount of energy or heat that is required to break the force of attraction between the particles to convert liquid into vapors. Vaporization is an endothermic reaction. So the amount of energy that is required over here is positive. Heat of condensation is negative that is heat is released during reaction.

We know that the heat of vaporization of water is 2260 J/g. So, the total amount of heat required to completely vaporize a 100gram sample of water at its boiling point is 2260×00=2.26×10⁵ J.

Thus the correct option is option (4)

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We know that the heat of vaporization of water is 2260 J/g. So 100 gram sample of water being completely vaporized needs 2260*100=2.26*10^5 J. So the answer is (4).

Which of the following is true of solids?a. All solids have equal melting points.
b. Ionic solids have higher melting points than molecular solids.
c. Molecular solids have higher melting points than all other types of solids.
d. It is impossible for solids to melt; therefore solids do not have melting points.

Answers

B. Ionic solids have higher melting points than molecular solids.

Which statement best describes the nucleus of an aluminum atom?(1) It has a charge of +13 and is surrounded by a total of 10 electrons.
(2) It has a charge of +13 and is surrounded by a total of 13 electrons.
(3) It has a charge of –13 and is surrounded by a total of 10 electrons.
(4) It has a charge of –13 and is surrounded by a total of 13 electrons.

Answers

The nucleus of an aluminum atom has a charge of + 13 and is surrounded by a total of 13 electrons. Therefore, option (2) is correct.

What is aluminum?

Aluminum is a chemical element with atomic number 13 and the chemical symbol Al. Aluminum has 13 protons in its nucleus so it has +13 charge on its nucleus and thirteen electrons surrounding the nucleus of the aluminum.

Aluminum element has a low density and has a great affinity towards oxygen and forms a protective layer of oxide when exposed to air.    

Aluminum is a post-transition metal placed in the p-block of the periodic table and forms compounds in the +3 oxidation state. The aluminum cation (Al³⁺) is polarizing in nature and forms metallic bonds to get its covalency in aluminum foil.

The atomic number of the aluminum atom is 13 therefore it has 13 electrons and 13 protons in its atom. The 13 electrons are present n the nucleus of an atom so the nucleus is positively charged.

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The answer is (2). The atomic number of Al atom is 13 which means that there is 13 protons in the nucleus. So the nucleus has a charge of +13. And the Al atom has net charge of 0. So there is 13 electrons surrounded the nucleus. 
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