Which of the following set of quantum numbers (ordered n, ℓ, mℓ ) are possible for an electron in an atom? Check all that apply
a. 2, 1, 3
b. 5, 3, -3
c. 4, 3, -2
d. -4, 3, 1
e. 2, 1, -2
f. 3, 2, 2
g. 3, 3, 1

Answer:

it's easier to lose one electron because it's less work for the atom to do and easier to lose one than gain a whole 7, because the atom wants to gain a full outer shell as soon as possible

Answer:

A. Decrease in temperature

Explanation:

The statement indicates an endothermic chemical reaction is "Decrease in temperature".

Endothermic reactions generate products by absorbing heat energy from the environment.

The temperature of the reaction mixture rises as energy is released in an exothermic process. The temperature drops when energy is absorbed in an endothermic reaction. A thermometer can be used to monitor temperature changes in the reaction mixture.

An endothermic reaction happens when the temperature of an isolated system drops while the temperature of its surroundings rises. The overall heat of reaction in endothermic reactions is positive (q > 0).

Hence the correct option is A.

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Answer:

D and E

Explanation:

The other answers don't support steel, they support iron or are supporting both, and the question is why steel alloys are more often used

C supports both

B supports how iron's strength

A supports iron being easily shaped and bent

hope this helps

The solubility of\(LaF_3\) in water is 3.04 x 10^-6 mol/L.

The solubility of \(LaF_3\) in water can be determined using the Ksp expression:

\(Ksp = [La^{3+}][F^-]^3\)

Where \([La^{3+}]\)and \([F^-]\) are the molar concentrations of the \(La^{3+}\) and \(F^-\) ions in the solution.

Since each \(LaF_3\) formula unit dissociates into one \(La^{3+}\) ion and three \(F^-\) ions, the molar solubility of \(LaF_3\) can be represented as x. Thus, the molar concentrations of \(La^{3+}\) and \(F^-\) ions in the solution can be written as x and 3x, respectively.

Substituting these values into the Ksp expression gives:

Ksp = x*(3x)^3 = 27x^4

Now, we can solve for x:

x = (Ksp/27)^(1/4)

= (2 x 10^-19 / 27)^(1/4)

= 3.04 x 10^-6 mol/L

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Answer:

V2= 1.03L

Explanation:

Start off with what you are given.

V^1: 1.00L

T^1: 23°C

V^2?

T^2: 33°C

If you know your gas laws, you have to utilise a certain gas law called Charles' Law:

V^1/T^1 = V^2/T^2

Remember to convert Celsius values to Kelvin whenever you are dealing with gas problems. This can be done by adding 273 to whatever value in Celsius you have.

(23+273 = 296)     (33+273 = 306)

Multiply crisscross

1.00/296= V^2/306

296V^2 = 306

Dividing both sides by 296 to isolate V2, we get

306/296 = 1.0337837837837837837837837837838

V2= 1.03L

Answer:

A is the answer hope this helps if wrong I ont know

Answer:

The final temperature of the copper would be 311.3°C.

I hope this helps you

Answer:

D because: A Triple bond is when three pairs of electrons are shared between two atoms in a molecule. It is the least stable out of the three general types of covalent bonds.

The empirical formula : CaAsO₄H

The empirical formula is the smallest comparison of atoms of compound =mole ratio of the components

The principle of determining empirical formula

\(\tt \dfrac{22.3}{40.078}=0.556\)

\(\tt \dfrac{41.6}{74.9246}=0.555\)

\(\tt \dfrac{35.6}{15.9994}=2.225\)

\(\tt \dfrac{0.56}{1.00794}=0.556\)

Divide by the smallest ratio(0.555) :

Ca : As : O : H ⇒

\(\tt \dfrac{0.556}{0.555}\div \dfrac{0.555}{0.555}\div \dfrac{2.225}{0.555}\div \dfrac{0.556}{0.555}=1\div 1\div 4\div 1\)

The molar mass is 3230.8 g/mol

First, we need to know that the formula for the general gas law  is represented as;

PV = nRT

such that the parameters are;

Substitute the values

1 × 2.33 = n × 8.314 × 433.15

Multiply the values, we get;

n = 2.33/ 8.314 × 433.15

Divide the values

n = 6.5 × 10⁻⁴ moles

But, number of moles = mass/molar mass

Molar mass = 2.10/ 6.5 × 10⁻⁴

Molar mass = 3230.8 g/mol

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Given that :

Reaction equation ; \(HB_{r} + KOH ---> KBr + H_{2}O\)

A) and B)  Determine the Initial pH before addition of titrant

First step : compute the value of pOH

pOH = - log ( [OH⁻])

        = -log ( 0.320 ) = 0.50

∴ Initial pH before the titrant is added = 14 - pOH

                                                               = 14 - 0.5 = 13.5

C ) Determine the pH of solution after 5 mL titrant is added

First step : determine the reacting moles of each substance

n kOH = 0.025 mL * 0.320 mol/L = 0.00800 mol

n HBr = 0.005 * 0.750 mol/L = 0.00375 mol

next step : compute the value of the concentration of OH⁻ in final solution

n kOH ( remaining ) = 0.00800 - 0.00375 = 0.00425 mol

final solution = 25.00 mL + 5.00 mL = 30.00 mL

∴ The value of the concentration of [ OH⁻] in 30.00 mL

  = [ OH⁻] = ( 0.0042 mol / 0.0300 mL )

                = 0.142 M

 hence pOH = - log (0.142) = 0.849

Final step; The pH of the solution after 5 mL of titrant is added

= 14 - pOH

= 14 - 0.849 = 13.15

Hence we can conclude that the initial pH before titrant was added is 13.50 and the pH after is as listed above.

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Answer:

Second answer may be 4Al +3O2 gives 2Al2O3

Answer:

1.  \(Hf:[Kr]4f^{14}5d^26s^2\)

2. The valence electrons are 4.

3. Due to poor shielding of inner electrons.

Explanation:

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.  

The element Hafnium (Hf) has atomic number of 72 and the nearest noble gas is Krypton has 36 electrons.

The electrons are filled according to Afbau's rule in order of increasing energies.

\(Hf:72:[Kr]4f^{14}5d^26s^2\)

As Hafnium is a d block element amd it has 2 electrons in 5d and 2 electrons in 6s.

The eletrons in 5d and 4f are poorly shielded by the inner electrons and thus experience strong nuclear charge and thus do not participate in bonding.

Answer:

Molarity =  2.02 M

Explanation:

Given data:

Molarity of solution = ?

Mass of sodium chloride = 38.5 g

Volume of solution = 325 mL (0.325 L)

Solution:

Number of moles = mass/molar mass

Number of moles = 38.5 g/ 58.44 g/mol

Number of moles = 0.658 mol

Molarity:

Molarity = number of moles / volume of solution in L

Molarity = 0.658 mol /0.325 L

Molarity =  2.02 M

50 g of As\(_2\)O\(_3\) are titrated with 38.5 mL of KMnO\(_4\) to reach the end point. 0.26M is the concentration of the KMnO\(_4\)  solution.

Concentration in chemistry refers to the quantity of a material in a certain area. The ratio of the solute within a solution to the solvent or whole solution is another way to define concentration. In order to express concentration, mass in unit volume is typically used.

The solute concentration can, however, alternatively be stated in moles or volumetric units. Concentration may be expressed as per unit mass rather than volume.

5As\(_2\)O\(_3\)(s)+4MnO\(_4\)⁻(aq)+9H\(_2\)O(l)+12H⁺(aq)⟶10H\(_3\)AsO\(_4\)(aq)+4Mn\(_2\)⁺(aq)

the stoichiometry ratio between As\(_2\)O\(_3\) and MnO\(_4\)⁻ is 5:4

0.0126 moles of  As\(_2\)O\(_3\) will react with 4/5×0.0126 moles = 0.01008moles

0.01008moles of MnO\(_4\)⁻ is present in 38mL

concentration of KMnO\(_4\)= moles×volume

                                        = 0.010/38×1000

                                        =0.26M

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The effect of the given factors on membrane fluidity are:

The factors that  affect membrane fluidity include;

Longer carbon tails: Phospholipids with longer carbon tails have more van der Waals interactions between their fatty acid chains, which makes the membrane more tightly packed and less fluid.

Presence of double bonds: Phospholipids with double bonds create kinks in their carbon tails, which makes it harder for them to pack tightly together. This increases the space between the phospholipid molecules, making the membrane more fluid.

Addition of cholesterol: At high temperatures, cholesterol reduces membrane fluidity by increasing the packing of the lipid molecules in the membrane. On the other hand, at low temperatures, cholesterol increases membrane fluidity by preventing the lipids from packing too closely together.

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Answer:

E) 1.85 M

Explanation:

M(C12H22O11) = 342.3 g/mol

22.5 g * 1mol/342.3 g = 0.0657 mol

35.5 mL = 0.0355 L

Molarity = mol solute/L solution = 0.0657 mol/0.0355L =1.85 mol/L = 1.85 M

The molarity of the aqueous solution is 1.85 M. The correct option is E) 1.85 M

From the question,

We are to determine the molarity (that is, concentration) of the given sucrose solution

First, we will determine the number of moles present in the given mass of sucrose

Mass of sucrose = 22.5 g

Using the formula

\(Number\ of\ moles = \frac{Mass}{Molar\ mass}\)

Molar mass of sucrose = 342.2965 g/mol

∴ Number of moles of sucrose present = \(\frac{22.5}{342.2965}\)

Number of moles of sucrose present = 0.0657325 moles

Now, for the molarity (concentration) of the sucrose solution

From the formula

Number of moles = Concentration × Volume

Then,

\(Concentration = \frac{Number\ of\ moles}{Volume}\)

From the question,

Volume = 35.5 mL = 0.0355 L

∴ \(Concentration = \frac{0.0657325}{0.0355}\)

Concentration = 1.85 M

Hence, the molarity of the aqueous solution is 1.85 M. The correct option is E) 1.85 M

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Answer:

b) All atoms contain

charged electrons.

Explanation:

Answer:

I believe the answer is carbon dating

Explanation:

Answer:

Multiplying the number of moles of the sample by Avogadro's number

Explanation:

The process that will help determine the number of atoms in a sample is by multiplying the number of moles of the sample by Avogadro's number.

The number of moles of substance has a wide range of application in quantitative chemistry.

A mole of any substance contains the Avogadro's number of particles. The particles can be atoms, molecules, formula units, neutrons, protons, electrons etc.

So, when we have the number of moles of a substance, the number of atoms is obtained by multiplying with the Avogadro's constant.

The partial pressure of hydrogen in the collected gas sample is 733.0 mm Hg (calculated by subtracting the partial pressure of water, 17.0 mm Hg, from the total atmospheric pressure, 750.0 mm Hg).

When a gas is collected over water, the presence of water vapor affects the total pressure observed. In this case, the total atmospheric pressure is given as 750.0 mm Hg, and the partial pressure of water vapor at 19.5°C is 17.0 mm Hg.

To determine the partial pressure of hydrogen, we need to subtract the partial pressure of water vapor from the total atmospheric pressure. Partial pressure refers to the pressure exerted by an individual gas component in a mixture. In this scenario, the collected gas is primarily hydrogen, with water vapor being the other component.

By subtracting the partial pressure of water vapor (17.0 mm Hg) from the total atmospheric pressure (750.0 mm Hg), we can find the partial pressure of hydrogen:

Partial pressure of hydrogen = Total atmospheric pressure - Partial pressure of water vapor

Partial pressure of hydrogen = 750.0 mm Hg - 17.0 mm Hg

Partial pressure of hydrogen = 733.0 mm Hg

Therefore, the partial pressure of hydrogen in the collected gas sample is 733.0 mm Hg.

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Answer:

60ug

Explanation:

If it has experienced two half lives, that means it has been halved twice. in that case, to undo it, just multiply it by two twice. 0.15ug * 2 = 0.30ug. 0.30ug * 2 = 0.60ug. Hope this helps.

As you move from left to right across a row of the periodic table, the atomic number increases, meaning there are more protons in the nucleus of the atom.

Atomic number is the number of protons in the nucleus of an atom, which determines its chemical properties and place in the periodic table of elements. The atomic number is represented by the symbol Z and is the whole number located above an element's symbol in the periodic table.

Elements are arranged in order of increasing atomic number, and elements with the same atomic number belong to the same element, regardless of their mass number or number of neutrons.

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Answer:

cause the bottom part starts at 0 and the top starts at 12

Explanation:

Answer:

C.) No, because the Moon reflects most of the Sun's light rather than

absorbing it

Explanation:

:p

Answer:

Silver

Explanation:

Silver (Ag) will not react with sulfuric acid (H2SO4(aq)) by single displacement reaction. This is because in the electrochemical series (activity series), silver is below hydrogen and it's less reactive.

The other elements stated (Zinc, Magnesium, Iron) are higher than hydrogen in the activity series and will definitely displace hydrogen in single displacement reaction.

A single-displacement reaction is known as a chemical reaction which occurs which one element is actually replaced or displaced by another in a compound. We represent it as:

B + D-C ➡️ B-C + D

This will readily take place if B is more reactive than D, and it will finally give a more stable product.

The pressure of the environment affects the liquid's boiling point. The boiling point of the liquid is higher when it is under high pressure than when it is under normal atmospheric pressure. For a given pressure, various liquids have different boiling points.

The temperature at which a liquid's vapour pressure equals the surrounding atmosphere is known as the boiling point of the liquid. This temperature causes the liquid to become a vapour.

The temperature of the liquid, the pressure of the atmosphere, and the pressure of the vapour all affect its boiling point.

We know that change in temperature of a system is given by the following formula:

Initial boiling point (T₁) = 80.1 °C

ΔT = T₂ - T₁

2.25 = T₂ - 80.1

T₂ = 82.35  °C

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Answer:

82.35

Explanation:

acellus

Answer:

lonic solid and polar liquid

Explanation:

Without more context I cannot fully answer, but upon researching your question I have found the answer of:

   lonic solid and polar liquid

If this seems to work for you, great! If not please provide more context :))

An example that shows kinetic energy becoming potential energy is when a ball is dropped from a tall building. That is option B.

Kinetic energy can be defined as the type of energy that is being possessed by an object or a body that is in motion.

Potential energy is the type of energy that is possessed by a body or an object that is steady or static.

A ball is said to shift from having kinetic energy to having potential energy once it stops moving like when it is being dropped from a given height.

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