In the Caribbean countries, general election is usually held every _ years​

Answer:

Because Sulphuric acid(H2SO4) is one of the substance which have a very high vigourous reaction if mix with chemicals thats why we take the same sulphuric acid but having lighter effects known to be as Dil.Sulphuric And so it is generally use for precaution while during experimentations Thats why we use it.

Hope it helps

A. The electronic configuration for the isotope we want is as follows:

[tex]1s^2 2s^2 2p^6 3s^2 3p^6[/tex].

B. The element belongs to period 3 and group 18.

C.The last electron's four quantum numbers are:

m_s = +1/2 or -1/2 (since the electron can spin up or spin down)

D. With fluorine, the element will develop an ionic connection.

The positioning of electrons within an atom, molecule, or other physical structure, such as a crystal, is referred to as electronic configuration. It is typically represented by an array of numbers, letters, or superscripts that denote the number of electrons in each atom or molecule's shell or subshell.

Let the first isotope's mass number be x, the second isotope's mass number be y, and the third isotope's mass number be z. Also, let the first isotope's neutron number be a, the second isotope's neutron number be b, and the third isotope's neutron number be c. Using the information provided, we can construct two equations:

126 = x + y + z (equation 1)

a+b+c=60 (equation 2)

Because all three isotopes contain the same amount of protons, we can infer that their electrical configurations are the same. As a result, all that remains is to determine the electrical structure of one of the isotopes.

We can use the fact that the total of the mass numbers is equal to the amount of protons plus the number of neutrons. Let m be the isotope's mass number and z be the number of protons (the atomic number). Then:

m = z + n, where n is the number of neutrons.

The electrical arrangement of an element can also be used to calculate the atomic number. Assume if the isotope we're seeking for is a periodic table element. The element's electrical configuration can be written as:

[tex]1s^2 2s^2 2p^6 3s^2 3p^6[/tex]

The configuration's last electron is in the (n+1)s or (n+1)p orbital. As a result, we may calculate the atomic number by counting the number of electrons in the arrangement. For example, the atomic number for the aforementioned electrical configuration is 18 (2 + 8 + 8).

Let's look for the electrical configuration of the isotope we're after. Because the element's electrical configuration is not specified, we can presume it is a noble gas. As an example, consider argon (Ar), which has the electrical configuration:

[tex]1s^2 2s^2 2p^6 3s^2 3p^6[/tex]

Because argon belongs to period 3 and group 18 (also known as group 8A), the isotope we seek belongs to period 3 and group 18. This is due to the fact that atoms in the same class have the same amount of valence electrons and chemical characteristics.

As a result, the electrical configuration of the isotope we seek is:

[tex]1s^2 2s^2 2p^6 3s^2 3p^6[/tex]

b) The element belongs to period 3 and group 18.

c) The last electron's four quantum numbers are:

Because the electron is in the 3p orbital, n = 3 l = 1.

Because there are three 3p orbitals, m_l = -1, 0, or 1.

m_s = +1/2 or -1/2 (since the electron can spin up or spin down)

d) With fluorine, the element will develop an ionic connection. Because the element belongs to group 18, it has 8 valence electrons, making it a stable noble gas configuration. It may gain one electron to make a 1- ion or lose eight electrons to form an 8+ ion to obtain this state. Fluorine has seven valence electrons and can gain one electron to produce.

Therefore, the electronic configuration for the isotope we want is as follows:

[tex]1s^2 2s^2 2p^6 3s^2 3p^6[/tex]

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Your question is in Spanish, but the English translation of the question is:

The sum of the mass numbers of three isotopes is 126 and the sum of the neutron numbers is 60. Find the electronic configuration of one of the isotopes if its electric charge is

1- b) Determine group and period for said element.

c) Determine the four quantum numbers for the last electron.

d) If the element they found joins with the fluorine element, what type of bond will it form?

Answer: Heat energy contained by water is 130.625 J.

Explanation:

Given: Mass = 1.25 g

Specific heat = [tex]4.18 J/g^{o}C[/tex]

Initial temperature = [tex]20.0^{o}C[/tex]

Final temperature = [tex]45.0^{o}C[/tex]

Formula used to calculate heat energy is as follows.

[tex]q = m \times C \times (T_{2} - T_{1})[/tex]

where,

q = heat energy

m = mass of substance

[tex]T_{1}[/tex] = initial temperature

[tex]T_{2}[/tex] = final temperature

Substitute the values into above formula as follows.

[tex]q = m \times C \times (T_{2} - T_{1})\\= 1.25 g \times 4.18 J/g^{o}C \times (45.0 - 20.0)^{o}C\\= 130.625 J[/tex]

Thus, we can conclude that heat energy contained by water is 130.625 J.

Answer:

the answer is b

hope this helps :)

please crown me brainliest!!!!

Answer:

Agree

Explanation:

Answer:

Agree

Explanation:

Explanation:

The molar mass of the compounds are incorrect

Explanation:

Mathematically, Ohm's law is given by :

V = IR

Where

V is voltage

I is current

R is resistance

The electric power of an electrical appliance is given by:

P = VI

Wattage = VI

Resistance, [tex]R=\dfrac{V}{I}[/tex]

Current, [tex]I=\dfrac{V}{R}[/tex]

Hence, this is the required solution.

Answer:

A biology investigation usually starts with an observation—that is, something that catches the biologist’s attention. For instance, a cancer biologist might notice that a certain kind of cancer can't be treated with chemotherapy and wonder why this is the case. A marine ecologist, seeing that the coral reefs of her field sites are bleaching—turning white—might set out to understand why.

How do biologists follow up on these observations? How can you follow up on your own observations of the natural world? In this article, we’ll walk through the scientific method, a logical problem-solving approach used by biologists and many other scientists.

Explanation:

Answer:

left = HCl

Middle = NH3

Right = water

Explanation:

HCl is a strong acid so it will have the strongest effect

NH3 is a weak acid so it will have a small effect

Water has no effect

Answer:

solid to liquid i think

Explanation:

entropy is natural disorder in simple terms- liquid the atoms are less organised than in a solid to increased entropy as they move apart becoming disordered

at least this is how i understand it

I believe that the answer is A.

The combination of potassium (K) and oxygen (O2) produces K2O (potassium oxide). The balanced equation is 2K + O2 ==> K2O.

Answer:

13.1 L

Explanation:

Using the combined gas law:

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure (atm)

P2 = final pressure (atm)

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

Based on the information provided in this question;

P1 = 1.95 atm

P2 = 0.65 atm

V1 = 5.0 L

V2 = ?

T1 = 20 °C = 20 + 273 = 293K

T2 = -15 °C = -15 + 273 = 258K

Using P1V1/T1 = P2V2/T2

1.95 × 5/293 = 0.65 × V2/258

9.75/293 = 0.65V2/258

0.0333 = 0.00252V2

V2 = 0.0333 ÷ 0.00252

V2 = 13.1 L

Answer:

O Ca(OH)2

Explanation:

According to Arrhenius definition of a base, it is a substance that dissociates in water to form hydroxide ions (OH-). This means that in the neutralization reaction between calcium hydroxide and sulfuric acid as described in this question, calcium hydroxide is the base because it contains the hydroxide ion (OH-).

Calcium hydroxide is a combination of calcium (Ca2+) as the cation and hydroxide (OH-) as the anion. Hence, the chemical formula will be Ca(OH)2.

78000 J

Chemistry

Thermodynamics

Specific Heat Formula: q = mcΔT

Math

Pre-Algebra

Order of Operations: BPEMDAS

Step 1: Define

Identify variables

[Given] m = 75 g

[Given] c = 4.184 J/g °C

[Given] ΔT = 235 °C - -15°C = 250 °C

[Solve] q

Step 2: Solve for q

Step 3: Check

Follow sig fig rules and round. We are given 2 sig figs as our lowest.

78450 J ≈ 78000 J

Answer:

(ii) 1 dye

(iii) Food coloring F is insoluble in the solvent

(iv) 'E' and 'H'

(b) Food colouring G

Explanation:

Paper chromatography principle is based on the rates of migration of chemicals across a sheet of paper which are different and it consists of a stationary phase such as the water in the paper and a mobile phase such as the solvent resulting in the partitioning of the components of the mixture across the paper

The solution components are positioned to start in one place from where they migrate and separate out on the chromatography paper

(ii) The number of components into which the food colouring 'H' separates into = 1

Therefore, the number of dyes in food colouring 'H' = 1 dye

(iii) Food coloring 'F' does not move because it is insoluble in the solvent, which is the mobile phase

(iv) The food colouring that contains the dye that is likely to be most soluble in the solvent are does for which the dyes travel furthest, which are;

Food coloring 'E' and 'H'

(b) Using a similar question solution found on 'tutor my self' website, we have;

The [tex]R_f[/tex] values are given as follows;

[tex]R_f = \dfrac{Distance \ moved \ by \ dye}{Distance \ moved \ by \ solvent}[/tex]

The distance moved by the solvent = 5 units

The distance moved by dyes in food colouring 'E' and 'H' = 4 units

The distance moved by dye in food colouring 'G' = 3.3 units

The distance moved by the second dye in food colouring 'E' = 2.7 units

By inspection, we get;

[tex]R_f[/tex] dye in food colouring 'G' = 3.3/5 = 0.66,

Therefore, the dye with [tex]R_f[/tex] value closest to 0.67 is the dye in food colouring 'G'.

Answer: Pressure of the gas in the tank is 9.8 atm.

Explanation:

Given: Moles = 2.0 moles,     Volume = 5.0 L

Temperature = [tex]25^{o}C = (25 + 273) K = 298 K[/tex]

Formula used to calculate pressure is as follows.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

[tex]PV = nRT\\P \times 5.0 L = 2.0 mol \times 0.0821 L atm/mol K \times 298 K\\P = \frac{2.0 mol \times 0.0821 L atm/mol K \times 298 K}{5.0 L}\\= 9.8 atm[/tex]

Thus, we can conclude that pressure of the gas in the tank is 9.8 atm.

the answer would be 150 m because you just add 60 and 90

Answer: rain

Explanation:

Metals wish to lose valence electrons and nonmetals wish to gain valence electrons.

Answer:

where is the answer??

Please do not just take the points without answering the question.

Answer:

2.4 mol x 22.4 liter = 53.76 liters

1 mole

Explanation:

The volume of a container that holds 2.4 mol of gas at STP is 53.76L

STP stands for standard temperature and pressure. STP refers to a specific pressure and temperature used to report on the properties of matter.

According to IUPAC( International Union of Pure and Applied Chemistry), it is defined as -

It is generally needed to test and compare physical and chemical processes where temperature and pressure plays an important role as they keep on varying from one place to another.

One mole of a gas under STP conditions occupies a volume of 22.4L.

Given,

Moles of gas = 2.4 moles

1 mole of a gas at STP occupies 22.4 L of volume

2.4 moles will occupy = 2.4 × 22.4

                                   = 53.76 L

Therefore, the volume of a container that holds 2.4 mol of gas at STP is 53.76L

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