What is the wavelength, in nanometers, of light with an energy content of 1898 kJ/mol ?Express your answer using four significant figures.

Answers

Answer 1

Answer: The energy of phton can be determined through the formula E= speed of light * Planck's constant divided by the wavelength of light. Placnk's constant is equal to 6.62607004 × 10-34 m2 kg / s while speed of light is equal to 3x10^8 m/s. Hence, the wavelength of light is 1.0465 x10^-22 nanometers.

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While testing amylase activity, John uses a buffer of pH 6 and substrate starch. He incubates them at 104ºF (40ºC). All the tubes show glucose formation, except one, which had no starch solution. Why did this happen?A) the optimum pH for enzyme amylase is not pH 6
B) the optimum temputure for the enzyme amylase is not 104. F (40.)
C) the substrate for amylase, starch, is not present

Answers

While testing amylase activity, John uses a buffer of pH 6 and substrate starch. He incubates them at 104ºF (40ºC). All the tubes show glucose formation, except one, which had no starch solution because the substrate for amylase, starch, is not present so thats why it does not show glucose formation
so correct option is C
hope it helps

Answer:

Explanation:

49 After decaying for 48 hours, l/16 of the original mass of a radioisotope sample remains unchanged. What is the half-life of this radioisotope?(1) 3.0 h (3) 12 h(2) 9.6 h (4) 24 h

Answers

Answer:

The half life of the radioisotope is 12 hours.

Explanation:

Initial mass of the radioisotope = x

Final mass of the radioisotope = $(1)/(16)* x$ = 0.0625x

Half life of the radioisotope = $t_{(1)/(2)}$

Age of the radioisotope = t = 48 hours

Formula used :

$N=N_o* e^(-\lambda t)\n\n\lambda =\frac{0.693}{t_{(1)/(2)}}$

where,

$N_o$ = initial mass of isotope

N = mass of the parent isotope left after the time, (t)

$t_{(1)/(2)}$ = half life of the isotope

$\lambda$ = rate constant

$N=N_o* e^{-((0.693)/(t_(1/2)))* t}$

Now put all the given values in this formula, we get

$0.0625x=x* e^{-((0.693)/(t_(1/2)))* 48 h}$

$\ln(0.0625) * (1)/((-0.693* 48 h))=(1)/(t_(1/2))$

$t_(1/2) = 11.99 hours = 12 hours$

The half life of the radioisotope is 12 hours.

1/16 left would imply 4 half lives have passed (1/2 left = 1, 1/4 left = 2, 1/8 left = 3, 1/16 left = 4). So 4 half lives passed in 48 hours, meaning dividing 48 by 4 will give you the length of 1 half life. Which in this case is 12 hours.

What tool can be used to measure the volume of a liquid to one decimal place?

Answers

graduated cylinder could be the answer u are loking for

im guessing a ruler. Because it can help with the lengths that you need to be finding.

How is molarity measured?O
A. In liters of water per moles of a dissolved substance
B. In liters of water per gram of a dissolved substance
O
C. In moles of a substance for 1 g of that substance
D. In moles of a substance dissolved in 1 L of water

Answers

Answer:

D. In moles of a substance dissolved in 1 L of water

Explanation:

Just took the test

Final answer:

Molarity is measured in moles of a substance dissolved in 1 L of water.

Explanation:

The molarity is measured in moles of a substance dissolved in 1 liter of water, so the correct option is D. In moles of a substance dissolved in 1 L of water. Molarity is a measure of the concentration of a solute in a solution. It is calculated by dividing the number of moles of solute by the volume of the solution in liters.

Molarity (M) is indeed a measure of the concentration of a solute in a solution and is defined as the number of moles of solute per liter of solution. This means it is measured in "moles of a substance dissolved in 1 liter of solution" or simply "moles/L" or "mol/L." Molarity is a fundamental concept in chemistry and is widely used in various chemical calculations and experiments to express the concentration of a substance in a solution.

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There are three stable atoms of Argon (Atomic Number 18): Argon-36, Argon-38 andArgon-40. What would the atoms of these isotopes have in common? What would
be different about their atoms? (4 points)
HELP ASAP

Answers

On the periodic table, argon has an average atomic weight of 39.948 amu. This number is really near 40. This suggests that Ar-40 is the isotope of argon (Ar) that is most prevalent in the natural world.

What characteristics do argon-36, argon-38, and argon-40 share?

If all three argon atoms are neutral, they would each contain 18 protons and 18 electrons. In comparison to one another, the three isotopes will each have a distinct number of neutrons (18, 20, and 22 neutrons respectively).

Why is potassium a 39 positioned before argon, atomic number 40, in the current periodic table?

Atomic number, not atomic mass, is used to categorise the elements. As the atomic number of argon (18) is less than that of potassium (19)

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How many grams of calcium phosphate can be produced when 89.3 grams of calcium chloride reacts with excess sodium phosphate? Unbalanced equation: CaCl2 + Na3PO4 → NaCl + Ca3(PO4)2

Show, or explain, all of your work along with the final answer.