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4 years ago

How many neutrons do (k) potassium-39 and potassium-40 have, respectively?

1 answer:

7 0

Potassium’s atomic number in periodic table is 19, Potassium can only have a mass numbers of 41, 40 and 39. Potassium 39, 40, and 41 are all different isotopes of the element potassium. Each of the isotopes has 19 electrons and 19 protons but the number of neutrons vary. So, in your question Potassium-39 has twenty (20) neutrons, and potassium-40 has 21 neutrons.

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3 years ago

What is the chemical formula for the base iron(III) hydroxide? Express your answer as a chemical formula.

Ronch [10]

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3 years ago

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Which of the following describes when he is transferred as a form of light

pantera1 [17]

Answer:

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3 years ago

An enzyme is discovered that catalyzes the chemical reaction:SAD -------->HAPPY

jekas [21]

Answer: Km = 10μM

Explanation: Michaelis-Menten constant (Km) measures the affinity a enzyme has to its substrate, so it can be known how well an enzyme is suited to the substrate being used. To determine Km another value associated to an eznyme is important: Turnover number (Kcat), which is the number of time an enzyme site converts substrate into product per unit time.

Enzyme veolcity is calculated as:

$V_{0} = \frac{E_{t}.K_{cat}.[substrate]}{K_{m}+[substrate]}$

where Et is concentration of enzyme catalitic sites and has to have the same unit as velocity of enzyme, so Et = 20nM = 0.02μM;

To calculate Km:

$V_{0}*K_{m} + V_{0}*[substrate] = E_{t}.K_{cat}.[substrate]$

$K_{m} = \frac{E_{t}.K_{cat}.[substrate]-V_{0}*[substrate]}{V_{0}}$

$K_{m} = \frac{0.02*600*40-9.6*40}{9.6}$

Km = 10μM

The Michaelis-Menten for the substrate SAD is 10μM.

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3 years ago

What is the maximum number of electrons in the following energy level? n = 3

11Alexandr11 [23.1K]

Answer is: 18 electrons.

The principal quantum number (n) is one of four quantum numbers which are assigned to each electron in an atom to describe that electron's state.
The azimuthal quantum number (l) is a quantum number for an atomic orbital that determines its orbital angular momentum and describes the shape of the orbital, l = 0....n-1.

For n = 3, l = 0, 1, 2.

l = 0, s orbital with 2 electron.

l = 1, p orbitals with 6 electrons.

l = 2, d orbitals with 10 electrons.

2 + 6 + 10 = 18 electrons.

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4 years ago

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