please help!!! due tomorrow and i’m really stuck!! thank you!

Answer:

Explanation:

I serched for it i found name is :sexithiophene

Answer: The new temperature of container is 123 K.

Explanation:

Given: [tex]P_{1}[/tex] = 795 mm Hg,     [tex]T_{1}[/tex] = 273 K

[tex]P_{2}[/tex] = 358 mm Hg,          [tex]T_{2}[/tex] = ?

Formula used to calculate the new temperature is as follows.

[tex]\frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}}[/tex]

Substitute the values into above formula as follows.

[tex]\frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}}\\\frac{795 mm Hg}{273 K} = \frac{358 mm Hg}{T_{2}}\\T_{2} = 123 K[/tex]

Thus, we can conclude that the new temperature of container is 123 K.

Answer:

The concentration of the original KOH solution is 0.1212 M.

Explanation:

Dilution is the process to reduce the concentration of solute in solution. This is accomplished by adding more solvent to the same amount of solute. In other words, dilution is the procedure followed to prepare a less concentrated solution from a more concentrated one, and it simply consists of adding solvent to an existing solution.

As only solvent is being added, the consequence is that by not increasing the amount of solute, but if the amount of solvent, the concentration of the solute decreases.

The expression for the dilution calculation is:

Ci* Vi = Cf* Vf

where:

In this case:

Replacing:

Ci* 25 mL= 0.1 M* 30.3 mL

Solving:

[tex]Ci=\frac{0.1 M*30.3 mL}{25 mL}[/tex]

Ci=0.1212 M

The concentration of the original KOH solution is 0.1212 M.

Answer:

the answer is 1,3,2

Explanation:

Balance equation

Answer:

1,3,2

Explanation:

took test

Answer:

4.1 moles

Explanation:

Applying

PV = nRT................ equation 1

Where P = pressure, V = volume, n = number of moles, R = molar gas constant, T = Temperature.

make n the subject  of the equation

n = PV/RT.............. Equation 2

From the question,

Given: V = 35 L , P = 2.8 atm, T = 15 °C  = (15+273) = 288 K, R = 0.083 L.atm/K.mol

Substitute these values into equation 2

n = (35×2.8)/(0.083×288)

n = 4.1 moles

Answer:

P2 = 37.5 psi

Explanation:

P1 = 32.1 psi

T1 = 25°C + 273 = 298K

T2 = 75°C + 273 = 348K

P2 = ?

P1/T1 = P2/T2

or

P2 = (T2/T1)P1

= (348K/298K)(32.1 psi)

= 37.5 psi

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]

Learn more about Electronic configuration, here:

https://brainly.com/question/29757010

#SPJ2

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:

because it could self drive

Explanation:

idrk but thats my answer

Answer: 185 grams

Explanation: First find out how many grams are in one mol: The molar mass es are taken from the periodic table, Ca is 40, O is 16, H is 1. There are 2 O and 2 H for (OH)2: 40+32+2= 74g/mol x 2.5 mol = 185 the moles cancel and you are left with grams

Answer:  Explanation:

Atom means the smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.

Iron means a common, inexpensive metal, often black in color, that rusts, is attracted by magnets, and is used in making steel.

Answer: Atoms are neutrally charged; they contain the same number of protons as electrons. By definition, an ion is an electrically charged particle produced by either removing electrons from a neutral atom to give a positive ion or adding electrons to a neutral atom to give a negative ion.

Answer:

D. 17

Explanation:

Halogens (group 17) are most likely to form a -1 ion. This is because they want to complete their octet. A prime example of this is sodium chloride. Sodium chloride is an ionic compound. Sodium gives up its valence electron, therefore, recieving a +1  charge, and Chlorine takes it, giving it a -1 charge. Chlorine is also in group 17, halogens.

Answer: the answer is D.17

Explanation:

Answer:

4

Explanation:

If I remember correctly, the atomic # will always be the same as the # of electrons

Copper is a conductor because its valence electron can move freely from atom to atom. Option (B) is correct answer.

Insulator is a material which does not conduct any current. Non metals are insulators. Electrons do not move freely in insulator. Thermal conductivity of insulator very is low and its resistance is vey high. These are used in making insulating electrical equipment.

Conductor is a substance which allow the electricity to flow through it. Metals are conductors. Electron can move freely in conductors. Thermal conductivity of conductor is very high and its resistance is vey low. These are used in making the electrical equipment.  

Now let check all options one by one:

Option (A): Copper is a conductor not an insulator. Copper is a metal and it consists free electrons and electron can move freely from one atom to another atom.

So, option (A) is incorrect.

Option(B): Copper is a conductor because its valence electron can move freely from atom to atom. As copper is a metal it is a good conductor of electricity. The thermal and electrical conductivity of copper is high.

So, option (B) is correct.

Option (C): Copper is not an insulator it is conductor as already discussed in option (A).

So, option (C) is also incorrect.

Option (D): Copper is a conductor because its electron can move freely and it is a good thermal conductor.

So, option (D) is also incorrect.  

Thus, from above conclusion we can say that Copper is a conductor because its valence electron can move freely from atom to atom.

Hence, option (B) is correct answer.

Learn more about Conductor and Insulator here: https://brainly.com/question/492289
#SPJ2

Answer:

The Density of Magnesium.

Explanation:

Answer:

The oxidation state of carbon in CaC204 is 3

Answer:

A. A as concentration decreases.

Explanation:

A represents a reactant and B is a product, the concentration of the latter increases at the expense of the concentration of the former. Hence, A is the reactant of the chemical reaction as its concentration decreases.

Answer:

C)12.09 Ampere

Explanation:

V= IR

Where I= current of the system

R= resistance= 0.67 ohm

V= potential difference=8.1 volts

Substitute the values

8.1= I× 0.67

I= 8.1/0.67

=12.09 Ampere

Answer:

ooh sorry, but will this help you now:

Ocean dynamics define and describe the motion of water within the oceans. Ocean temperature and motion fields can be separated into three distinct layers: mixed (surface) layer, upper ocean (above the thermocline), and deep ocean. Ocean currents are measured in sverdrup (sv), where 1 sv is equivalent to a volume flow rate of 1,000,000 m (35,000,000 cu ft) per second.

Surface currents, which make up only 8% of all water in the ocean, are generally restricted to the upper 4…

Explanation:

Hope this helps :)

Answer:

c i need 3 brainliests for virtuoso rank pls

Explanation:

Answer:

500,000 m

Explanation:

Each km has 1000m so to covert any km to m simply multiply the length value by 1000.

500 x 1000 =  500,000

Answer:

6

Explanation:

Answer:

all metals have low melting point

Answer:

If we subtract the atomic number from the atomic mass: atomic mass - atomic number = number of protons + number of neutrons - number of protons. Thus we get the number of neutrons present in an atom when we subtract the atomic number from the atomic mass.

Explanation: hope this helps???

Answer:

The 2nd one is the one

Explanation:

and it isn't writen out all the way

Answer: Volume is 22,3 ml

Explanation:  I assume solubility is expressed to 100 ml water

You can use proportion :  179 g / 100 ml water =  40 gm/ V

Multiplying the proportion gives 179 g  · V = 100 ml · 40 g | : 179 g

V = 4000  ml / 179 = 22,3 ml

Answer:

0.35M NaOH and 0.0375M HCl.

Explanation:

NaOH reacts with HCl as follows:

NaOH + HCl → NaCl + H2O

Where 1 mole of NaOH reacts per mole of HCl

To solve the first question we must find the moles of HCl that reacted = Moles NaOH in the unknown. With the moles and the volume we can find its molar concentration:

Moles HCl = Moles NaOH:

0.0350L * (0.25mol / L) = 0.00875 moles NaOH

In 25.0mL = 0.0250L:

0.00875 moles NaOH / 0.0250L =

0.35M NaOH

For the second question, the moles of NaOH = moles HCl. With the 200mL = 0.200L the molarity is:

Moles NaOH = Moles HCl:

0.015L * (0.5mol / L) = 0.0075 moles HCl / 0.200L =

0.0375M HCl

Answer:

its a little bit long but= The most obvious result of the removal of the top predators in an ecosystem is a population explosion in the prey species.More predators kill more prey, which, along with food scarcity, decreases the population. When prey becomes more scarce, the predator population declines until prey is again more abundant.

Answer:

Spinal Cord

Explanation:

The spinal cord is part of the central nervous system.

The lungs are part of the respiratory system.

The heart is part of the cardiovascular system.

The pancreas is part of the digestive system.