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3 years ago

4. What happens when a bond is formed between a greenish yellow gaseous element X and a

Chemistry

2 answers:

weeeeeb [17]3 years ago

6 0

Answer:

A. Atom x gains an electron

Explanation:

What happens when a bond is formed between a green gaseous element and a soft metallic element?（2.0分）

A. The gas atoms gain an electron.

B. The gas atoms lose an electron.

C. The metal atoms gain an electron.

D. The two elements share a pair of electrons

charle [14.2K]3 years ago

4 0

Answer:

A). Atom x gains an electron.

hope this is right answer.

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A solution of hydrochloric acid of unknown concentration was titrated with 0.10 M NaOH. If a 100.-mL sample of the HCl solution

madam [21]

Answer: The initial pH of the HCl solution is 3

Explanation:

To calculate the concentration 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 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:

$n_1=1\\M_1=?M\\V_1=100mL\\n_2=1\\M_2=0.10M\\V_2=1mL$

Putting values in above equation, we get:

$1\times M_1\times 100=1\times 0.10\times 1\\\\M_1=\frac{1\times 0.10\times 1}{1\times 100}=10M$

1 mole of HCl produces 1 mole of $H^+$ ions and 1 mole of $Cl^-$ ions

To calculate the pH of the solution, we use the equation:

$pH=-\log[H^+]$

We are given:

$[H^+]=0.001M$

Putting values in above equation, we get:

$pH=-\log (0.001)\\\\pH=3$

Hence, the initial pH of the HCl solution is 3

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3 years ago