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UNO [17]
3 years ago
8

how to determine the aspects for core and valence electrons in a periodic table. How comes in some elements like cobalt the 3d i

s on the valence side and arsenic the 3d is on the core side.​
Chemistry
1 answer:
dusya [7]3 years ago
5 0

Answer:

See explanation

Explanation:

The electron configuration of an atom in an element determines the property of the atom. The core electrons are found inside the atom while the valence electrons are found on the outermost shell of the atom.

For cobalt, the outermost shell electron configuration is; [Ar] 3d7 4s2. The 3d7 and 4s2 are found in the valence shell of cobalt.

For arsenic, the electronic configuration is [Ar] 3d¹⁰ 4s² 4p³. The valence electrons are 4s2, 4p3. The 3d electrons are found inside the arsenic atom.

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Answer: A dune is a mound of sand formed by the wind, usually along the beach or in a desert.  Dunes can also be formed by strong currents beneath the water.

6 0
2 years ago
An enzyme is discovered that catalyzes the chemical reaction:SAD -------->HAPPY
jekas [21]

Answer: Km = 10μM

Explanation: <u>Michaelis-Menten constant</u> (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: <em>Turnover number (Kcat)</em>, 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

<u>The Michaelis-Menten for the substrate SAD is </u><u>10μM</u><u>.</u>

3 0
3 years ago
You stir a cup of hot chocolate with a spoon. Why does the spoon keep its shape in the drink?
luda_lava [24]

a because the spoon is a solid and the hot chocolate is a liquid.So that means that spoon moves slower than a liquid.


                                                                                                        

6 0
4 years ago
Read 2 more answers
Identify the reactants in the following chemical reaction: . 6H2O + 6CO2 ---&gt; C6H12O6 + 6O2. . a. 6CO2 +C6H12O6. b. 6H20 + 60
Nikolay [14]
The correct answer is d. <span>6H20 + 6CO2.

The reactant in the chemical reaction </span>6H2O + 6CO2 ---> C6H12O6 + 6O2 is 6H20 + 6CO2. Remember that the reactant is always at the left side of the equation. So the correct answer is <span>6H20 + 6CO2 since it's in the left of the equation. I hope this answer helped you. </span>
4 0
3 years ago
Read 2 more answers
At 218°C, Keq=1.2 x 10^-4 for the equilibrium NH4SH(s) ⇋ NH3(g) + H2S(g). Calculate the equilibrium concentrations of NH3 and H2
maksim [4K]

At 218 °C, solid NH₄SH decomposes to form 0.011 M NH₃ and H₂S, as given by its equilibrium constant.

<h3>What is the equilibrium constant?</h3>

The equilibrium constant (Keq) is the ratio of the product of the concentrations of the products to the product of the concentrations of the reactants, all raised to their stoichiometric coefficients.

Only gases and aqueous species are included.

  • Step 1. Make an ICE chart.

        NH₄SH(s) ⇋ NH₃(g) + H₂S(g)

I                                 0           0

C                               +x          +x

E                                x            x

  • Step 2. Write the equilibrium constant.

Keq = 1.2 × 10⁻⁴ = [NH₃] [H₂S] = x²

x = 0.011 M

At 218 °C, solid NH₄SH decomposes to form 0.011 M NH₃ and H₂S, as given by its equilibrium constant.

Learn more about equilibrium here: brainly.com/question/5081082

#SPJ1

3 0
2 years ago
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