How many covalent bonds are predicted for each atom: (a) F; (b) Si; (c) Br; (d) O; (e) P; (f) S?

Chemistry

2 answers:

GuDViN [60]4 years ago

6 0

Answer:

1 for F

4 for Si

1 for Br

2 for O

3 for P

2 for S

Explanation:

Atoms form bonds with other atoms with the purpose of completing their outer energy levels. So a good strategy of predicting how many bonds an atom will form is to first establish how many electrons it needs to complete its valence shell.

F has 7 valence electrons, it needs one more electron to complete its valence shell so it forms one bond

Si has 4 valence electrons, it needs four more so it forms four bonds

O has 6 valence electrons, it needs two more so it forms two bonds

evablogger [386]4 years ago

4 0

The <span>covalent bonds are predicted for each atom are :

</span>(a)F = 1
(b) Si = 4
(c) Br = 1
(d) O = 2
(e) P = 3
(f) S = 2

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Calculate the pH of the following aqueous solution:

Annette [7]

The pH of an aqueous solution that has a concentration of 0.35 M NaF and pKa for HF = 3.14 is 3.6.

<h3>How to calculate pH?</h3>

The pH of a solution refers to the degree of acidity or alkalinity of the solution. It can be calculated using the Henderson-Hasselbalch Equation as follows:

pH = pka + log ([A-]/[HA])

Where;

A- = conjugate base
HA = weak acid

pH = pKa + log([F-]/[HF])

pH = 3.14 + log(1/0.35)

pH = 3.14 + 0.4559 = 3.595

Therefore, the pH of an aqueous solution that has a concentration of 0.35 M NaF and pKa for HF = 3.14 is 3.6.

Learn more about pH at: brainly.com/question/15289741

7 0

3 years ago

4. A piece of metal weighing 0.0713 g was placed in a eudiometer containing dilute aqueous HCl. After the metal fully dissolved,

Anastasy [175]

Complete Question

4. A piece of metal weighing 0.0713 g was placed in a eudiometer containing dilute aqueous HCl. After the metal fully dissolved, 23.5 mL of hydrogen gas was collected by displace-ment of water and a 400 mm column of water was observed. The water temperature was 258C and the barometric pressure was 758.8 mm Hg (torr). Refer to the Introduction and data sheet to solve the following problems.

a) What is the vapor pressure of the water vapor in the column? (Consult Appendix E.)

b) What is the pressure of the water column expressed in mm Hg (torr)? The density of mercury is 13.6 g/mL.

c) Calculate the pressure of the hydrogen gas above the water in the column.

d) Calculate the volume occupied by the hydrogen gas at STP.

Answer:

a) $25\textdegree C=23.8 torrs$