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3 years ago

Why are the group I elements are very active

Chemistry

1 answer:

borishaifa [10]3 years ago

4 0

Answer:

it's because they have one electron in there valence shells.

I hope this helps

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Calculate the pH of a solution made by adding 59 g of sodium acetate, NaCH3COO, to 23 g of acetic acid, CH3COOH, and dissolving

Elza [17]

This is an incomplete question, here is a complete question.

Calculate the pH of a solution made by adding 59 g of sodium acetate, NaCH₃COO, to 23 g of acetic acid, CH₃COOH, and dissolving in water to make 400. mL of solution. Hint given in feedback. The Ka for CH₃COOH is 1.8 x 10⁻⁵ M. As usual, report pH to 2 decimal places.

Answer : The pH of the solution is, 4.97

Explanation :

First we have to calculate the moles of CH₃COOH and NaCH₃COO

$\text{Moles of }CH_3COOH=\frac{\text{Given mass }CH_3COOH}{\text{Molar mass }CH_3COOH}=\frac{23g}{60g/mol}=0.383mol$

and,

$\text{Moles of }CH_3COONa=\frac{\text{Given mass }CH_3COONa}{\text{Molar mass }CH_3COOH}=\frac{59g}{82g/mol}=0.719mol$

Now we have to calculate the value of $pK_a$ .

The expression used for the calculation of $pK_a$ is,

$pK_a=-\log (K_a)$

Now put the value of $K_a$ in this expression, we get:

$pK_a=-\log (1.8\times 10^{-5})$

$pK_a=5-\log (1.8)$

$pK_a=4.7$

Now we have to calculate the pH of the solution.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

$pH=pK_a+\log \frac{[CH_3COONa]}{[CH_3COOH]}$

Now put all the given values in this expression, we get:

$pH=4.7+\log (\frac{0.719}{0.383})$

(As the volume is same. So, we can write concentration in terms of moles.)

$pH=4.97$

Therefore, the pH of the solution is, 4.97

6 0

4 years ago

NASA has been scanning neighboring planets for signs of life, but there is always the possibility that life on other planets cou

Alex

Answer:

Silicon

Explanation:

One of the most similar elements to carbon on periodic table is silicon. Several compounds formed between carbon or silicon and other elements are identical.

Carbon is an element found in life forms as a building block while silicon is a building block of machine components such as semiconductors

Silicon is an element that can sustain bonds, similar to carbon bonds and it is situated directly under carbon on the periodic table

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4 years ago

When ice melts and becomes liquid water, it has undergone a ______.

Zina [86]

Physical change there is no energy lost or gain. Basically the physical change is the change of state like melting

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4 years ago

The air in a living room has a mass of 60 Kg and a specific heat of 1,020 J/kg°C. What is the change in thermal energy of the ai

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