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Charra [1.4K]
3 years ago
14

Which statement is true? (2 points) Select one: a. Geothermal power plants use the renewable resource of heat from within the Ea

rth to generate electricity. B. Hydroelectric energy uses the energy from the sun, which is a renewable resource. C. Oil is a nonrenewable resource that is hardly ever used, so there is not a concern of depleting the Earth's supply. D. Solar energy is a nonrenewable resource that is used by many countries all over the world.
Chemistry
1 answer:
love history [14]3 years ago
5 0

The correct answer is A, since it is the only sensible answer.

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A person's heart beats 72 times a minute. At this rate, how many times does it beat in one hour?
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Substrate: N-benzoyl-L-tyrosine ethyl ester (BTEE) 0.001M in 50% aqueous
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0.1 mL of the stock solution of the enzyme is taken and made up to 5.0 mL with 0.001M HCl in order to prepare a 50-fold diluted enzyme.

<h3>What is dilution?</h3>

Dilution is a process of making a solution of lower concentration from a solution of higher concentration by the addition of solvent to a given volume of the solution of higher concentration.

Dilution of solutions is done using the dilution formula in order to determine the given volume of diluent or stock solution required. The dilution formula is given below:

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V= ?

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Therefore, 0.1 mL of the stock solution of the enzyme is taken and made up to 5.0 mL with 0.001M HCl in order to prepare a 50-fold diluted enzyme.

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3 0
1 year ago
Which unit can be used to express the concentration of a solution?
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ppm=\frac{\text {mass of Solute}}{\text {Mass of solution}}\times 10^6

L/s is used to express flow rate.

J/g is used to express energy per unit mass.

kPa is used to express pressure.

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