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3 years ago

Who has the more valued Exports?

Chemistry

2 answers:

san4es73 [151]3 years ago

4 0

Egypt I’m pretty sure I’m right I’m sorry if I’m not

IgorC [24]3 years ago

3 0

Answer:

Egypt

Explanation:

Hi again

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Which element has the greatest number of valence electrons available for bonding? selenium boron calcium chlorine

katrin2010 [14]

Answer : The correct option is, Chlorine

Explanation :

The given elements are, Se, B, Ca, Cl

Element is Selenium, Se

Atomic number = 34

Group number = 16

General Electronic configuration of the group number 16 elements is, $ns^2np^4$ .

The general configuration shows the number of valence electrons are present in the element.

The number of valence electrons present = 2 + 4 = 6

Element is Boron, B

Atomic number = 5

Group number = 13

General Electronic configuration of the group number 13 elements is, $ns^2np^1$ .

The number of valence electrons present = 2 + 1 = 3

Element is Calcium, Ca

Atomic number = 20

Group number = 2

General Electronic configuration of the group number 2 elements is, $ns^2$ .

The number of valence electrons present = 2

Element is Chlorine, Cl

Atomic number = 17

Group number = 17

General Electronic configuration of the group number 17 elements is, $ns^2np^5$ .

The number of valence electrons present = 2 + 5 = 7

From this we conclude that the chlorine is the element which has the greatest number of valence electrons available for bonding.

Hence, the correct option is, Chlorine.

4 0

3 years ago

Read 2 more answers

element q reacts with dilute acids but not with cold water . element r does not react with dilute acids . element s displaces p

masya89 [10]

Answer:

s<p<q<r

Explanation:

Given

Element s displaces p from its oxide. Thus, s is more reactive that p

p reacts with cold water but element q cannot react with cold water. Thus,

p is more reactive than q

Element q is able to react with weak or dilute acids but element r in unable to react with weak or dilute acids. Thus, q is more reactive that r

The order of four elements on the basis of their reactivity in descending order is as follows

s<p<q<r

5 0

3 years ago

A first-order reaction is 45% complete at the end of 43 minutes. What is the length of the half-life of this reaction

shtirl [24]

The half-life of the reaction is 50 minutes

Data;

Time = 43 minutes
Type of reaction = first order
Amount of Completion = 45%

<h3>Reaction Constant</h3>

Let the initial concentration of the reaction be X $_0$

The reactant left = (1 - 0.45) X $_0$ = 0.55 X $_0$ = X

For a first order reaction

$\ln(\frac{x}{x_o}) = -kt\\ k = \frac{1}{t}\ln (\frac{x_o}{x}) \\ k = \frac{1}{43}\ln (\frac{x_o}{0.55_o})\\ k = 0.013903 min^-^1$

The half-life of a reaction is said to be the time required for the initial amount of the reactant to reach half it's original size.

$x = \frac{x_o}{2} \\t = t_\frac{1}{2} \\t_\frac{1}{2} = \frac{1}{k}\ln(\frac{x_o}{x_o/2})\\$

Substitute the values

$t_\frac{1}{2} = \frac{1}{k}\ln(2)=\frac{0.6931}{0.013903}\\t_\frac{1}{2}= 49.85 min = 50 min$

The half-life of the reaction is 50 minutes

Learn more on half-life of a first order reaction here;

brainly.com/question/14936355

4 0

3 years ago

Cumulus and comulonimbus clouds are more likely to be formed by which front?

dexar [7]

They are most likely formed by cold fronts!

5 0

3 years ago

What is the most complete answer below about the information, found about the element uranium in the periodic table

jonny [76]

Answer:

92 is that atomic number and 238.03 is the atomic mass number

Explanation:

The structure of the atom is given as:

⁹²₂₃₈.₀₃U

The number 92 is the atomic number of the atom.

The atomic number is the number of protons within an atom. This number defines the nature and type of atom that we have.

238.03 is the atomic mass number;

The is the number of protons and neutrons within an atom. It is typically the mass of nucleus.

6 0

3 years ago