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3 years ago

What happens to ice as it warms up

1 answer:

6 0

When you add ice to hot water, some of the water’s heat melts the ice. The remaining heat warms the ice-cold water but cools the hot water in the process. You can calculate the mixture’s final temperature if you know how much hot water you started with, along with its temperature and how much ice you added. Two physical properties -- the specific heat and the heat of fusion -- determine exactly how the ice melts and the water cools.

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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

8CO + 17H2 → C8H18 + 8H2O

liq [111]

Answer: 27,625 grams

Explanation:

*This is actually pretty simple

According to your equation, we know that:

8 moles of CO will react completely with 17 moles of H2

so:

6.50 moles of Co will react completely with x moles of H2

x= (6.50 x 17)/8 = 13.8125 (moles)

Since the Molar Mass of H2 is 2 g/mol, we can calculate the amount of H2 needed to react completely with 6.50 moles of CO:

=>13.8125 x 2= 27.625 (grams)

5 0

3 years ago

The reaction below is catalyzed by yeast alcohol dehydrogenase. Which of the following corresponds to X and Y in this reaction?

Free_Kalibri [48]

Answer:

B) X = NAD+ Y = NADH + H+

Explanation:

The reaction catalyzed is a redox, where the alcohol is oxidated to acetaldehyde and NAD+ is reduced to NADH+ + H+

6 0

3 years ago

what is the balanced net ionic equation for the reaction in acidic solution of fe2+ and kmno4 (fe2+ becomes ff3+ and MnO4 become

sveticcg [70]

The balanced half reactions are
4 Fe2+ ====> 4 Fe3+ + 4 e-

MnO42- + 8 H+ + 4 e- ===> Mn2+ + 4 H2O

The net ionic equation is
4 Fe2+ + MnO42- + 8 H+ ===> 4 Fe3+ + Mn2+ + 4 H2O

4 0

4 years ago

Hydrogen gas can be produced by reacting aluminum with sulfuric acid. How many moles of sulfuric acid are needed to completely r

Illusion [34]

Answer:

22.5

Explanation:

all you have to do is take the number of moles of al and multiply them by sulfuric acids mole ratio as given in the equation (3), then divide by aluminums mole ratio number (2). then you will have moles of sulfuric acid.

*note: this only works if you are going moles to moles, if you are converting to anything else, this will NOT work*

if you have any questions leave them in the comments and i will try to answer them, if this helped, pls give a brainly

7 0

3 years ago