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3 years ago

3. What is the best explanation for the decrease in first ionization energy moving from Be to B?

Chemistry

1 answer:

ioda3 years ago

7 0

Answer:

The electrons in Be are located in the 2s subshell .These electrons penetrate closer to the Nucleus than the 2p electrons in B

Explanation:

See the Electronic Configurations

$\\ \sf\longmapsto Be=1s^22s^2$

$\\ \sf\longmapsto B=1s^22s^22p^1$

2s orbitals are more powerful than 2p orbitals.

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Hydrogenation reactions, in which H2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer indu

scoundrel [369]

Answer:

73140 kJ.

Explanation:

Equation of the hydrogenation reaction:

C2H4 + H2 --> C2H6

Molar mass = (2*12) + (6*1)

= 30 g/mol

Mass of C2H4 = 15.9 kg

= 15900 g

Number of moles = mass/molar mass

= 15900/30

= 530 mol of C2H6

By stoichiometry, 1 mole of C2H4 is hydrogenated to give 1 mole of C2H6

Number of moles of C2H4 = 530 mole

Q = n * q

= 530 * 138 kJ

= 73140 kJ.

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3 years ago

State one advantage of drinking hard water rather than drinking soft water

Lady_Fox [76]

Answer: Have a great day!

Explanation: Unlike hard water, soft water is free of harsh minerals that can damage your home and your body. In other words, it is more gentle on your body and your home. Without calcium and magnesium, soft water can prevent scale buildup around your home including your appliances and pipes.

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3 years ago

What were the two primary gases in Earth's early atmosphere?

Gemiola [76]

Hydrogen and helium

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3 years ago

Determine the number of moles of the anhydrous salt present after heating, assuming that the contents of the aluminum cup after

lara31 [8.8K]

Answer:

0.2 moles, assuming weight of dried salt

Explanation:

In order to determine the number of moles, we need to be aware of the mass of the substance in question.

Assuming the mass of the dehydrated $KAl(SO_{4} )_{2}.H_{2} O$ is 50g.

No. of moles = mass of substance/ molar mass of the substance.

= $\frac{50g}{39+27+32*2+16*4*2\\)g/mol}$

= 0.2 moles moles.

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3 years ago

What metal has the largest atomic radius in period 4 (78 points)

marysya [2.9K]

Answer:

The element potassium(K) with atomic number 19 has the largest atomic radius ( around 225 picometers ).

Explanation:

There is the general expected decrease from left to right with increasing nuclear charge without quantum level expansion or increase in shielding and so pulling the outer electrons closer. The 3d block of metals (Z = 21 to 30) tend to be similar and in fact tend to go through a small minimum at Mn/Fe.

The potassium been on the left most part of period , has largest radius due to least nuclear pulling effect.

6 0

4 years ago