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2 years ago

Do elements in the same group have same principle number?

Chemistry

2 answers:

luda_lava [24]2 years ago

7 0

Answer:

Yes

Explanation:

The atomic number never changes because the number of protons for na elecment never change and if they do, they trn into a neww element

Leviafan [203]2 years ago

4 0

The s-, p-, and d-block elements of the periodic table are arranged into 18 numbered columns, or groups. The elements in each group have the same number of valence electrons. As a result, elements in the same group often display similar properties and reactivity.

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This is a random error/change in the DNA sequence. These may be inherited or occur in cells during the lifetime of the organism.

dusya [7]

This is the definition of a DNA mutation.

Depending on which part of the genome is affected, the consequences of a mutation may vary. A mutation is said to be hereditary if the mutated genetic sequence is transmitted to the next generation (see germinal mutations). It is one of the elements of biodiversity and one of the many factors that may be involved in the evolution of the species.

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3 years ago

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The atoms of a metalloid have 6 valence electrons. The metalloid is used as a semiconductor. Which best describes the electron s

faltersainse [42]

Valence electrons are located in the outermost shell of the atom.

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3 years ago

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Hydrogen can be extracted from natural gas according to the following equilibrium.

antiseptic1488 [7]

Answer:

2.16x10⁻²

Explanation:

First, let's find out the molar concentrations of the reactants. The molar mass of CH4 is 16 g/mol, and of CO2 is 44 g/mol. The number of moles is the mass divided by the molar mass:

nCH4 = 24.0/16 = 1.5 moles

nCO2 = 88.0/44 = 2 moles

The concentration is the number of moles divded by the volume, thus:

[CH4] = 1.5/1 = 1.50 M

[CO2] = 2/1 = 2.00 M

For the equilibrium reaction, let's do an equilibrium chart:

CH4(g) + CO2(g) ⇄ 2CO(g) + 2H2(g)

1.50 2.00 0 0 Initial

-x -x +2x +2x Reacts (stoichiometry is 1:1:2:2)

1.50-x 2.00-x 2x 2x Equilibrium

As sateted in problem, [CH4] = 2.70*[CO]

1.50 - x = 2.70*2x

1.50 - x = 5.4x

6.4x = 1.50

x = 0.2344

Thus, at equilibrium:

[CH4] = 1.50 - 0.2344 = 1.2656 M

[CO2] = 2.00 - 0.2344 = 1.7656 M

[CO] = 2*0.2344 = 0.4688 M

[H2] = 2*0.2344 = 0.4688 M

The equilibrium constant is the multiplication of the concentrations of the products elevated by their coefficients, divided by the multiplication of the concentration of the reactants elevated by their coefficients.

K = ([CO]²*[H2]²)/([CH4]*[CO2])

K = (0.4688²*0.4688²)/(1.2656*1.7656)

K = 0.0483/2.2345

K = 2.16x10⁻²

7 0

3 years ago

If you have 23.8g of CaCl2, how many formula units is it?

NemiM [27]

Answer:

1.3×10²³ formula unit

Explanation:

Given data:

Mass of CaCl₂ = 23.8 g

Number of formula unit = ?

Solution:

Number of moles = mass/molar mass

Number of moles = 23.8 g/110.98 g/mol

Number of moles = 0.21 mol

1 mole of any substance contain 6.022×10²³ formula unit

0.21 mol × 6.022×10²³ formula unit / 1mol

1.3×10²³ formula unit

8 0

3 years ago

On the basis of the information below, the dissolution of FeF2(s) in acidic solution is A. thermodynamically favorable, because

antoniya [11.8K]

Since K3 is greater than 1, the reaction is thermodynamically favorable.

Data;

FeF2 is in an acidic solution
K2 > 1 is thermodynamically favorable
k3 > 1 is not thermodynamically favorable
K1<1 is not thermodynamically favorable

This states that the heat change in a given chemical reaction is the same irrespective of the number of process in which the reaction is effected.

Using Hess Law;

$rxn_3 = rxn_1 * 2rxn_2\\k_3 = k_1 * k_2^2\\k_3 = 2*10^-^6 * (1*10^3)^2\\k_3 = 2$

substituting this using Gibbs law,

$\delta G^0_3 = -RT\ln K_3\\\delta G^0_3 < 0$

Since K3 is greater than 1, the reaction is thermodynamically favorable.

Learn more on Hess law here;

brainly.com/question/12895682

8 0

2 years ago