2 years ago

4. Write the electronic configuration of first 20 elements in the periodic table.

1 answer:

7 0

Answer:

Name Atomic Number Electron Configuration Period 1 Hydrogen 1 1s1 Helium 2 1s2 Period 2 Lithium 3 1s2 2s1 Beryllium 4 1s2 2s2 Boron 5 1s2 2s22p1 Carbon 6 1s2 2s22p2 Nitrogen 7 1s2 2s22p3 Oxygen 8 1s2 2s22p4 Fluorine 9 1s2 2s22p5 Neon 10 1s2 2s22p6 Period 3 Sodium 11 1s2 2s22p63s1 Magnesium 12 1s2 2s22p63s2 Aluminum 13

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Explain how a heater warms the air in a room, including the words density, volume, and temperature in your explanation

seropon [69]

Answer:

Explanation:

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2 years ago

what is ( H+) and (OH-) in a healthy person's blood that has a PH of 7.50 assume that the temperature of the blood is 298 K.

AlekseyPX

pH = - log [H⁺]

pH = 7.5

$\tt [H^+]=10^{-7.5}=3.16\times 10^{-8}$

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2 years ago

What is the mass, in grams, of 1.15 mol of water, H2O?

garri49 [273]

M = n x Mr

Mr of H20 - 18.006

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2 years ago

What is the purpose of replication?

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Answer:

2-to produce copies of a DNA molecule

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3 years ago

You are trying to determine how

ss7ja [257]

Answer:

0,218 moles

Explanation:

I will first explain how many liters is 256ml, that is 0,256 l.

because the m stands for milli which is a factor of 1000 -> (256 ml / 1000 = 0,256 l)

To calculate the amount of moles you multiply the volume with the concentration. So 0,256l x 0,855M = 0,218 moles.

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1 year ago