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lakkis [162]
3 years ago
13

What element has the electron arrangement 2,8,4?

Chemistry
1 answer:
jasenka [17]3 years ago
3 0

Answer:

Silicon

Explanation:

It's in the 4A group and it has 4 valence electrons.

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3 years ago
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How many moles of potassium hydroxide are needed to completely react with 2.94 moles of aluminum
S_A_V [24]

The balanced equation is

2Al + 2KOH + 6H2O   -----> 2K[Al(OH)4  +  3H2.

From the above we see that  2 moles of K react with  2 moles of Al.

So 2 .94  moles of aluminium will react with 2.94 moles of potassium  (answer)

4 0
3 years ago
Which form of energy is associated with the random motion of particles in water
Verizon [17]

Answer:

Energy of Movement.

Explanation:

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3 0
3 years ago
What volume (mL) of the partially neutralized stomach acid was neutralized by NaOH during the titration? (portion of 25.00 mL sa
almond37 [142]

The question is incomplete, here is the complete question:

What volume (mL) of the partially neutralized stomach acid having concentration 2 M was neutralized by 0.1 M NaOH during the titration? (portion of 25.00 mL NaOH sample was used; this was the HCl remaining after the antacid tablet did it's job)

<u>Answer:</u> The volume of HCl neutralized is 1.25 mL

<u>Explanation:</u>

To calculate the volume of acid, we use the equation given by neutralization reaction:

n_1M_1V_1=n_2M_2V_2

where,

n_1,M_1\text{ and }V_1 are the n-factor, molarity and volume of stomach acid which is HCl

n_2,M_2\text{ and }V_2 are the n-factor, molarity and volume of base which is NaOH.

We are given:

n_1=1\\M_1=2M\\V_1=?mL\\n_2=1\\M_2=0.1M\\V_2=25mL

Putting values in above equation, we get:

1\times 2\times V_1=1\times 0.1\times 25\\\\V_1=\frac{1\times 0.1\times 25}{1\times 2}=1.25mL

Hence, the volume of HCl neutralized is 1.25 mL

3 0
3 years ago
PLEASE ANSWER
anastassius [24]

the correct answer should be a

4 0
3 years ago
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