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3 years ago

Which of the following is not an example of a chemical change?

Chemistry

1 answer:

kaheart [24]3 years ago

8 0

The answer is A. Melting snow because it is a physical change because you can then trun around and make it snow again

Physical change you can turn it back to the original

Chemical you can not

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dlinn [17]

Answer:

there are four peaks in the 13c NMR (B)

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3 years ago

Cytochromes are critical participants in the electron transport chains used in photosynthesis and cellular respiration. How do c

goblinko [34]

Answer:

4) Each cytochrome has an iron‑containing heme group that accepts electrons and then donates the electrons to a more electronegative substance.

Explanation:

The cytochromes are proteins that contain heme prosthetic groups. Cytochromes undergo oxidation and reduction through loss or gain of a single electron by the iron atom in the heme of the cytochrome:

$Cytochrome-Fe²⁺ ⇄ cytochrome-Fe³⁺-e⁻$

The reduced form of ubiquinone (QH₂), an extraordinarily mobile transporter, transfers electrons to cytochrome reductase, a complex that contains cytochromes b and c₁, and a Fe-S center. This second complex reduces cytochrome c, a water-soluble membrane peripheral protein. Cytochrome c, like ubiquinone (Q), is a mobile electron transporter, which is transferred to cytochrome oxidase. This third complex contains the cytochromes a, a₃ and two copper ions. Heme iron and a copper ion of this oxidase transfer electrons to O₂, as the last acceptor, to form water.

Each transporter "downstream" is more electronegative than its neighbor "upstream"; oxygen is located in the inferior part of the chain. Thus, the electrons fall in an energetic gradient in the electron chain transport to a more stable localization in the electronegative oxygen atom.

7 0

3 years ago

A dose of aspirin of 5.0 mg per kilogram of body weight has been prescribed to reduce the fever of an infant weighing 8.5 pounds

Tanya [424]

<h3>Answer;</h3>

19 mg

<h3>Explanation;</h3>

dose = 5.0 mg/kg

weight of infant = 8.5 pounds

Convert 8.5 pounds to kg: 8.5 pounds = 3.86 kg

Therefore;

The dose to give the infant is:

= (5.0 mg/kg) x (3.86 kg)

= 19.3 mg

≈ 19 mg

5 0

3 years ago

Read 2 more answers

Which situation would not cause the following equilibrium to shift to the right

Elis [28]

If you’re talking about a reaction, an increase in the products (values on the right side of the chemical equation) would cause the reaction to shift left instead of right. Also a decrease in the reactants.

Also, could be wrong, but increasing the volume/ decreasing the pressure on the reactant side will cause the reaction to shift left

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3 years ago

Which of the following are characteristics of a protein? Select all that apply. A. It is made of amino acids. B. It has long cha

gayaneshka [121]

I believe the answers are A and D

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3 years ago