The Lithium atom has only two energy levels. The third is empty. Therefore, we can refer to the second energy level of the lithium atom as the outermost level. The electrons in this outermost energy level are called valence electrons. Refer to the table you just constructed, and determine the number of valence electrons for the first 18 elements. Fill in the table with the identified number of valence electrons

Type the correct answer in each box. Use numerals instead of words.​

When 1 mole of hydrogen reacts with 1 mole of chlorine, 72.92 g of hydrogen chloride is formed. Option D is correct .

The balanced chemical equation for the reaction of hydrogen with chlorine to form hydrogen chloride is:

H2(g) + Cl2(g) → 2HCl(g)

According to the equation, one mole of hydrogen reacts with one mole of chlorine to produce two moles of hydrogen chloride. The molar mass of HCl is 36.48 g/mol, as given in the table.

To find the mass of HCl produced when 1 mole of H2 reacts with 1 mole of Cl2, we need to first find the number of moles of HCl produced. This can be done using stoichiometry:

1 mole of H2 reacts with 1 mole of Cl2 to produce 2 moles of HCl

Therefore, 1 mole of H2 reacts to produce 2 moles of HCl.

The mass of 2 moles of HCl is:

2 moles HCl x 36.48 g/mol = 72.92 g

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Answer:

The clear liquid is less dense than the black liquid, which is why it floats on top. If the volume were different, you would visually see more clear liquid than black and vice versa.

The clear liquid is less dense than the black liquid

Answer:

A. The clear liquid is less dense than the black liquid

Explanation:

Since the clear liquid since on top of the black one it's density is less. Whatever liquid has a higher density will sink to the bottom of the flask.

The wavelength of light with a frequency of 4.36 x 10^15 Hz is approximately 68.9 nanometers.

To calculate the wavelength of light in nanometers, we can use the formula:

wavelength = speed of light/frequency

The speed of light is approximately 3.00 x 10^8 meters per second. We need to convert the frequency of 4.36 x 10^15 Hz to Hz. Thus,

wavelength = (3.00 x 10^8 m/s) / (4.36 x 10^15 Hz)

Simplifying this expression, we get:

wavelength = 0.0689 x 10^-6 m = 68.9 x 10^-9 m

Finally, we convert meters to nanometers by multiplying by 10^9:

wavelength = 68.9 x 10^-9 m x 10^9 nm/m

wavelength = 68.9 nm

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Answer:

Matter has mass and takes up space, everything has matte, your body takes up space.  Matter refuels the body. You can also so your body produces matter as well

In the event that a thermometer breaks, the most important action to take is to pick up the broken glass and dispose of it properly.

You should also clean the area to ensure that there are no remaining pieces of glass. Additionally, it is important to tell the teacher about the accident right away and not try to save the red alcohol or pay for a replacement thermometer, as this is not necessary.

Calling 911 is not necessary, unless someone is injured by the broken thermometer. When cleaning up a mercury spill, it is important to use caution and protective gear, such as gloves, goggles, and a face mask, to reduce the risk of exposure to mercury vapors. You should also make sure to keep any children and pets away from the spill area.

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Volume is the amount of space taken up by an object

The instrument used to measure liquid volume is called a graduated cylinder.

The formula used to calculate the volume of a solid object such as a rectangular prism is: V =  length, *  width * height

Volume is a measure of the amount of space that a substance or object occupies. It is typically measured in units such as liters, cubic meters, gallons, or cubic feet.

The instrument used to measure liquid volume is called a graduated cylinder. It is a cylindrical tube made of glass or plastic, with volume markings along its length that allow for the accurate measurement of liquids.

The formula used to calculate the volume of a solid object depends on its shape. Here are some common formulas for finding the volume of different types of solid objects:

Cube: V = s³ (where s is the length of one side of the cube)

Rectangular prism: V =  length, *  width * height

Sphere: V = 4/3πr³ (where r is the radius of the sphere)

Cylinder: V = πr^2h (where r is the radius of the cylinder and h is its height)

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If 170 milligrams of a radioactive substance decays to 85 g after 16 hours. Then, after 21 hours, approximately 75.2 mg of the radioactive substance will remain.

The decay of the radioactive substance follows an exponential decay equation of the form:

\(N(t) = N_{o} \times e^{-kt}\)

Where:

N(t) is the amount of substance remaining at time t

N₀ is the initial amount of substance

k is the decay constant

t is the time elapsed

Given to us is N₀ = 170 mg and N(16) = 85 mg. We can use this information to find the decay constant, k.

\(85 = 170 \times e^{-k \times 16}\)

Dividing both sides by 170:

\(0.5 = e^{-k \times 16}\)

To solve for k, we can take the natural logarithm (ln) of both sides:

ln(0.5) = -k × 16

from this, the value of k comes out to be:

k = 0.0431

Now we can use the decay equation to find the amount of substance remaining after 21 hours, N(21):

\(N(21) = 170 \times e^{-0.0431 \times 21}\)

Calculating this expression:

N(21) = 75.2

Therefore, after 21 hours, approximately 75.2 mg of the radioactive substance will remain.

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Answer:

d

Explanation:

Answer:

D

Explanation:

help me on my work please

Answer:Gravity and inertia

Answer:The empirical formula for this vitamin : C₃H₄O₃

Further explanation  

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

The principle of determining empirical formula

Determine the mass ratio of the constituent elements of the compound.  

Determine the mole ratio by dividing the percentage by the atomic mass

Mass of C in CO₂ :(MW C = 12 g/mol, CO₂=44 g/mol)

Mass of H in H₂O :(MW H = 1 g/mol, H₂O = 18 g/mol)

Mass O = Mass sample - (mass C + mass H) :

mol ratio C : H : O =

Explanation:

Answer:

A. Distance = 18 m

    time = 2 hr

    speed = 9 m/hr

Explanation:

Speed is the same thing as velocity.

Velocity = distance/time

18m/2hr = 9m/hr

For choice B, the numbers are right, but the units are mixed (minutes were changed to hours)

There are mass/mole ratios of elements in compounds in compositional stoichiometry questions and mass/mole ratios of compounds in balanced equations in reaction-based stoichiometry problems.

Composition stoichiometry relates to the atomic structure of a chemical compound, whereas reaction stoichiometry refers to the quantity of compounds consumed or created during a chemical reaction. This is the main distinction between composition and reaction stoichiometry.

Chemically speaking, the term "stoichiometry" refers to the quantitative information about a chemical substance or chemical reaction. When the information pertains to a chemical compound, it is referred to as composition stoichiometry; when it pertains to a chemical reaction, it is referred to as reaction stoichiometry.

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Based on the tabulated data, compound B represents B) a metallic compound. Hence, option B) a metallic compound is the correct answer.

Characteristics of metals are:

Because electrons are mobile in metallic solids , they are good conductors of heat and electricity. Metallic solids are also malleable and ductile due to the ability of the metal nuclei to move past each other without disrupting the bonding.

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Answer:an ionic compound

Explanation:

The freezing point of the solution is -11.8 °C.

The boiling point of the solution is 103.31 °C.

To determine the freezing point of the solution, we can use the equation:

ΔTf = Kf * m

where:

ΔTf is the freezing point depression,

Kf is the cryoscopic constant (for water, Kf = 1.86 °C/m),

m is the molality of the solution (moles of solute per kilogram of solvent).

First, let's calculate the molality (m) of the solution:

Molar mass of ethylene glycol (C2H6O2):

C = 12.01 g/mol

H = 1.01 g/mol (x 6) = 6.06 g/mol

O = 16.00 g/mol (x 2) = 32.00 g/mol

Total molar mass = 12.01 g/mol + 6.06 g/mol + 32.00 g/mol = 50.07 g/mol

Number of moles of ethylene glycol (C2H6O2) = mass / molar mass

Number of moles = 30.8 g / 50.07 g/mol = 0.615 mol

Mass of water = volume x density = 96.6 mL x 1.00 g/mL = 96.6 g

Now, let's calculate the molality:

Molality (m) = moles of solute / mass of solvent (in kg)

Molality = 0.615 mol / 0.0966 kg = 6.36 mol/kg

Now we can calculate the freezing point depression (ΔTf):

ΔTf = Kf * m

ΔTf = 1.86 °C/m * 6.36 mol/kg = 11.8 °C

To find the freezing point of the solution, subtract the freezing point depression from the freezing point of pure water (0 °C):

Freezing point = 0 °C - 11.8 °C = -11.8 °C

To determine the boiling point of the solution, we can use the equation:

ΔTb = Kb * m

where:

ΔTb is the boiling point elevation,

Kb is the ebullioscopic constant (for water, Kb = 0.52 °C/m),

m is the molality of the solution (same value as calculated before: 6.36 mol/kg).

ΔTb = 0.52 °C/m * 6.36 mol/kg = 3.31 °C

To find the boiling point of the solution, add the boiling point elevation to the boiling point of pure water (100 °C):

Boiling point = 100 °C + 3.31 °C = 103.31 °C

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The specific length and position of the shadow will also be influenced by the height and orientation of the flagpole, as well as the time of year and latitude.

The position and length of the shadow cast by a flagpole three hours later will depend on the movement of the sun and the angle of the sun's rays. Assuming that the sun is moving in a relatively straight path across the sky, if the flagpole is in the northern hemisphere, the shadow will shift to the east as the sun moves toward the west. The length of the shadow will decrease gradually as the sun gets closer to the horizon. If it is midday, the shadow will be shortest, while earlier or later in the day, the shadow will be longer. However, if the flagpole is in the southern hemisphere, the shadow will shift to the west as the sun moves toward the east, and the length of the shadow will increase gradually.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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All atoms in a piece of pure copper have the same atomic number and the same number of electrons which is option A.

Copper is an element that consists of only one type of atom, which is the copper atom. The copper atom has 29 protons in its nucleus, which gives it an atomic number of 29. This means that in a neutral copper atom, there are also 29 electrons that surround the nucleus in electron shells.

In a piece of pure copper, all of the atoms are identical and have the same number of protons, neutrons, and electrons. This is because the copper atoms are all of the same isotope, meaning they have the same number of neutrons as well as protons. Isotopes are atoms of the same element that have different numbers of neutrons, but in the case of copper, there is only one stable isotope, which means all copper atoms have the same number of neutrons.

Pure copper is composed of only one type of atom, which is copper. Copper has a well-defined atomic number (29) that specifies the number of protons present in the nucleus of each copper atom. Since atoms are electrically neutral, the number of electrons present in the copper atoms is also equal to the atomic number, 29.

Therefore, all atoms in a piece of pure copper have the same atomic number and the same number of electrons.

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Answer:

i believe it's c

Explanation:

my reason is that if you look at the electrons 2 is the most comm

Answer:

1) it takes 13 second

2) 2100 miles

3) 40 miles / hours

4) 730 meters

the net charge on the given peptide can be calculated as follows:Ala (neutral) + Thr (neutral) + Leu (neutral) + Asp (negative) + Ala (neutral) + Lys (positive) + Pro (neutral) + Glu (negative) = -1Therefore, the net charge on the given peptide at pH 7.0 is -1.

The net charge at pH 7.0 on a peptide with the sequence ala-thr-leu-asp-ala-lys-pro-glu is -1. Peptides are short chains of amino acids. The charge on a peptide can be calculated by summing the charges on its constituent amino acids and adjusting for the pH of the solution. At pH 7.0, some amino acids have a positive charge (arginine, histidine, and lysine) while others have a negative charge (aspartate and glutamate). The remaining amino acids (alanine, threonine, leucine, and proline) are neutral. Therefore, the net charge on the given peptide can be calculated as follows:Ala (neutral) + Thr (neutral) + Leu (neutral) + Asp (negative) + Ala (neutral) + Lys (positive) + Pro (neutral) + Glu (negative) = -1Therefore, the net charge on the given peptide at pH 7.0 is -1.

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Answer:

Sift the mixture to separate the rock from the iron filings, soil and salt.

You can then use a magnet to separate the iron filings from the salt and soil.

Afterwards, you can pour water into the remaining salt- soil mixture. Salt will dissolve but the soil will remain at the bottom of the water.

If you want to separate the salt from the water, you can boil it till all the water evaporates. The only thing that'd be left in the pan is salt.

Answer:  1 cm = 100m

Explanation:  Centi- is the prefix used to designate 0.01 (one hundredth) of something.  1 cm means 0.01 m.

1 cm = 100 m  is NOT a correct conversion factor. Option C is correct.

The conversion factors are the factors that re-use to convert some values from unit to unit of another value like from centimeter to meter from meter to kilometer from milligram to gram.

In one centimeter it is the suffix used to denote it is the one by hundred value of the on meter or which is equal t one meter so, 1cm = 0.01 meters as it is the 1/100 part f the one-meter distance.

Therefore, Option C is correct. 1 cm = 100 m  is NOT a correct conversion factor.

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1) The wavelength of the photon is 6.5 * 10^ -7 m

2) The final level is n =2

3) The number of photons is 1 * 10^ 22

Recall that we must first convert the energy to joules as follows;

1 eV = 1.6 * 10^ -19 J

1.89 eV = 1.89 eV * 1.6 * 10^ -19 J/ 1 eV

= 3.024 * 10^ -19 J

Again;

E = hc/λ

E = energy

h = Plank's constant

c = speed of light

λ = wavelength

3.024 * 10^ -19 J = 6.6 * 10^ -34 * 3 * 10^ 8/λ

λ = 6.6 * 10^ -34 * 3 * 10^ 8/3.024 * 10^ -19 J

= 6.5 * 10^ -7 m

2)

Now we have;

E = -RH (1/\(n_{2} ^{2}\) - 1/\(n_{1} ^{2}\))

RH = Rydberg constant

Initial level = 2

Final level = x

Energy =  1.89 eV or 3.024 * 10^ -19 J

3.024 * 10^ -19  = - 2.18 * 10^ -18 (1/x^2 - 1/4)

3.024 * 10^ -19 /2.18 * 10^ -18 = 1/4 - 1/x^2

0.139 = 1/4 - 1/x^2

0.139 = 0.25 - 1/x^2

0.139 -  0.25  = - 1/x^2

-0.111 = - 1/x^2

0.111 = 1/x^2

x^2 = 9

x = 3

3) Let us find the energy from;

E = 6.6 * 10^ -34 * 3 * 10^ 8/400 * 10^-9

E = 0.0495 * 10^- 17 J

E = 4.95 * 10^ -19 J

Then;

5,000 J = n4.95 * 10^ -19 J

n = 5,000 J/4.95 * 10^ -19 J

= 1 * 10^ 22

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The heat absorbed or released by a substance when its temperature changes depend on its heat capacity (Cp). The Cp of the water is 1 cal/g°C. The heat released can be found by the following equation:

Where,

Q is the heat released or absorbed

m is the mas oof water, 15.5g

Cp is the heat capacity of water, 1cal/g°C

dT is the change in temperature

We replace the known values

In Joules the heat released will be:

the heat has a negative value, this is because the water released heat.

Answer:

The amount of heat released is 504 calories or 2019 joules

The correct solubility product constant for the reaction shown is Ksp = [Ca2+][F-]2.

The solubility product constant, also known as Ksp, is a measure of the extent to which a sparingly soluble salt dissociates in solution. For the reaction shown, CaF2(s) dissociates into Ca2+ and F- ions. The Ksp expression for this reaction is Ksp = [Ca2+][F-]2, where [Ca2+] and [F-] represent the concentrations of the ions in solution.

The value of Ksp depends on the temperature and pressure of the system, as well as the specific conditions of the reaction. It is important to note that the Ksp value is specific to each individual reaction and cannot be generalized to other reactions. By determining the value of Ksp for a particular reaction, we can calculate the concentrations of the ions in solution at equilibrium, which can be useful in predicting the behavior of the system under different conditions.

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Multiple personality or dissociative identity disorder often begins in childhood as a result of unbearable experiences.

The correct option is b) in childhood as a result of unbearable experiences.

Dissociative identity disorder (DID), previously known as multiple personality disorder, is a mental health condition characterized by the presence of two or more distinct identities or personality states within an individual. These identities may take control of the person's behavior and memory at different times.

In most cases, DID begins in childhood as a result of unbearable experiences. Children who have experienced trauma, such as physical or sexual abuse, neglect, or other forms of significant emotional distress, may develop DID as a way to cope with and dissociate from these overwhelming experiences. Dissociation serves as a defense mechanism to protect the individual from the pain and emotional turmoil associated with their traumatic past.

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The molarity of the base, Ca(OH)₂ needed for the reaction is 0.0689 M

We'll begin by writing the balanced equation for the reaction. This is given below:

Ca(OH)₂ + 2HCl —> CaCl₂ + 2H₂O

From the balanced equation above,

The mole ratio of the acid, HCl (nA) = 2

The mole ratio of the base, Ca(OH)₂ (nB) = 1

Volume of base, Ca(OH)₂ (Vb) = 25 mL

Volume of acid, HCl (Va) = 34.45 mL

Molarity of acid, HCl (Ma) = 0.1 M

The molarity of the base needed for the reaction can be obtained as follow:

MaVa / MbVb = nA / nB

(0.1 × 34.45) / (Mb × 25) = 2

3.445 / (Mb × 25) = 2

Cross multiply

Mb × 25 × 2 = 3.445

Mb × 50 = 3.445

Divide both side by 50

Mb = 3.445 / 50

Thus, the molarity of the base, Ca(OH)₂ needed for the reaction is 0.0689 M

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The e general name of the first reaction intermediate that is formed Carbocation.

In dehydration of alwhat, on adding acid, the intermediate Which is formed is carbocation.

1) Carbocation is reactive intermediate species.

2) It is electron deficient species (It has betectro)

3) Carbonation is s p^2 hybridised.

4) It is planar in geometry.

5) It undergoes rearrangement.

5) It undergoes rearrangement.

It is common knowledge that an alcohol will dehydrate in the presence of an acid and transform into an alkene. According to Zaitsev's rule, the primary product will typically be the alkene that has been most replaced.

This rule is not always adhered to, though, and in some specific cases the product creation can be controlled kinetically rather than creating the more thermodynamically stable product.

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According to the information in Table 1., Al metal requires the most energy to raise 1.00 g of it by 1.00ºC

The specific heat capacity of a substance represents the amount of energy required to raise the temperature of a given mass of that substance by 1 degree Celsius. In this case, we are comparing the specific heat capacities of aluminum (Al), nickel (Ni), copper (Cu), and lead (Pb) to determine which metal requires the most energy to raise its temperature. Among the given metals, aluminum (Al) has the highest specific heat capacity value of 0.903 J/g·°C. This means that it takes 0.903 Joules of energy to raise the temperature of 1 gram of aluminum by 1 degree Celsius.

On the other hand, nickel (Ni) has a lower specific heat capacity of 0.444 J/g·°C, copper (Cu) has a specific heat capacity of 0.389 J/g·°C, and lead (Pb) has the lowest specific heat capacity of 0.128 J/g·°C. Since aluminum has the highest specific heat capacity value, it requires the most energy to raise the temperature of 1.00 gram of it by 1.00 degree Celsius.

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