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wlad13 [49]
3 years ago
13

After the death of living material, the ratio of carbon-12 to carbon-14 isotopes in the material;

Chemistry
1 answer:
Ad libitum [116K]3 years ago
3 0
Decrease on edg 2020
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2-phosphoglycerate(2PG) is converted to phosphoenolpyruvate (PEP) by the enzyme enolase. The standard free energy change(deltaGo
pogonyaev

Answer:

The correct option is: (D) -2.4 kJ/mol

Explanation:

<u>Chemical reaction involved</u>: 2PG ↔ PEP

Given: The standard Gibb's free energy change: ΔG° = +1.7 kJ/mol

Temperature: T = 37° C = 37 + 273.15 = 310.15 K    (∵ 0°C = 273.15K)

Gas constant: R = 8.314 J/(K·mol) = 8.314 × 10⁻³ kJ/(K·mol)     (∵ 1 kJ = 1000 J)

Reactant concentration: 2PG = 0.5 mM

Product concentration: PEP = 0.1 mM

Reaction quotient: Q_{r} =\frac{\left [ PEP \right ]}{\left [ 2PG \right ]} = \frac{0.1 mM}{0.5 mM} = 0.2

<u>To find out the Gibb's free energy change at 37° C (310.15 K), we use the equation:</u>

\Delta G = \Delta G^{\circ } + 2.303 R T log Q_{r}

\Delta G = 1.7 kJ/mol + [2.303 \times (8.314 \times 10^{-3} kJ/(K.mol))\times (310.15 K)] log (0.2)

\Delta G = 1.7 + [5.938] \times (-0.699) = 1.7 - 4.15 = (-2.45 kJ/mol)

<u>Therefore, the Gibb's free energy change at 37° C (310.15 K): </u><u>ΔG = (-2.45 kJ/mol)</u>

4 0
3 years ago
1. A recipe for s'mores calls for 2 graham crackers, 2 chocolate pieces and 1 marshmallow. If I
Dominik [7]

Answer:

1.  7 ,   2.  0 crackers, 6 choc pieces and 1 marshmallow

Explanatio

8 0
2 years ago
Which of the following items is a salt? (1 point)
Tems11 [23]

  • Calcium carbonate is the  salt  among the given options.

  • Calcium carbonate ( CaCO3) can be regarded as  which appears as white and odorless powder or  as a colorless crystals it is  insoluble in water.

  • The chemical  formula is CaCO3. It can be used as an antacid as well as food colouring and a  food firming agent and a fertilizer.

  • Calcium carbonate is calcium salt as well as carbonate salt with one-carbon compound

  • Salt can be regarded as substance which is  produced by reaction between acid and  base. It  consists negative ion (anion) of that acid as well as positive ion (cation) of the base.

  • Sodium hydroxide is a base and not a salt

  • Carbonic acid is an acid and not a salt

  • Therefore, calcium carbonate is the only salt in the among the given options.

Learn more at ; brainly.com/question/14091731?referrer=searchResults

5 0
2 years ago
Why must the mass of magnesium be less than 0.09 g?
SVEN [57.7K]
The mass of magnesium should be less than 0.09g to enable a faster reaction rate. Magnesium reacts to form a white coating around it which stops the reaction. The lesser the gram the faster the reaction before the coating is formed. It is also advisable to use magnesium fillings to increase the rate of reaction.
7 0
3 years ago
Question 15 of 35
Solnce55 [7]

The statements that describe how the pond turned into the bog is as follows: Large water plants grew in shallow water around the edge of the pond.

<h3>What is a pond?</h3>

Pond is an inland body of standing water, either natural or man-made, that is smaller than a lake.

A bog is an area of decayed vegetation (particularly sphagnum moss) which forms a wet spongy ground too soft for walking.

This means that a pond can become a bog when existing plants in the pond decays until the land becomes soft.

Therefore, the statements that describe how the pond turned into the bog is as follows: Large water plants grew in shallow water around the edge of the pond.

Learn more about ponds and bogs at: brainly.com/question/9715563

#SPJ1

7 0
2 years ago
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