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rusak2 [61]
3 years ago
14

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]3 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]3 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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The number of energy levels will increase.

Explanation:

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6 0
2 years ago
A filament of a light bulb is made from a pure sample of tungsten.
GenaCL600 [577]

Answer:

The correct options are:

1) Pure chemical substance

2) Element.

Explanation:

each of the term is explained below:

1) <u>Mixture: </u> Since tungsten is an element in periodic table thus it is not a mixture.

2) False by definition of mixture.

3) false by definition of mixture.

4) <u>Solution:</u> Tungsten in a filament is in solid form hence solution is incorrect.

5) Since it is given in the question itself that the sample is pure hence option 'E' is correct as chemical substance is a pure substance that has a homogeneous composition and the sample in the question is given as pure.

6) <u>Compound:</u> By definition of compound it is formed by mixing 2 or more elements but since tungsten is an element that occurs independently in nature hence it is not a compound.

7) Tungsten is a element in the periodic table with atomic number 74.

8 0
3 years ago
A 5-kg quantity of radioactive isotope decays to 2 kg after 10 years. Find the decay constant of the isotope.k = _____
Dvinal [7]

Answer:

k = -0.09165 years^(-1)

Explanation:

The exponential decay model of a radioactive isotope is generally given as;

A(t) = A_o(e^(kt))

Where;

A_o is quantity of isotope before decay, k is decay constant and A(t) is quantity after t years

We are given;

A_o = 5 kg

A(10) = 2kg

t = 10 years

Thus;

A(10) = 2 = 5(e^(10k))

Thus;

2 = 5(e^(10k))

2/5 = (e^(10k))

0.4 = (e^(10k))

In 0.4 = 10k

-0.9164 = 10k

k = -0.9164/10

k = -0.09165 years^(-1)

7 0
3 years ago
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Lisa [10]

Answer:B

Explanation:

omplementary colors are two opposing colors that can be found on the color wheel.

3 0
3 years ago
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matrenka [14]

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Explanation:

6 0
3 years ago
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