The density of copper is 8.94 g/cm3. An irregular shaped sample of metal is 14 g and displaces a volume of 2.98 mL. (a) Find the density of this unknown metal. (b) Is this metal copper?

Answer:

The answer is a

Using the prefix method for covalent compounds, the names of the given compounds are shown below:

LIF: Lithium fluoride

Cl2O7: Dichlorine heptoxide

N2O3: Dinitrogen trioxide

SF6: Sulfur hexafluoride

Na3PO4: Sodium phosphate

A covalent bond is  described as a chemical bond that involves the sharing of electrons to form electron pairs between atoms.

The properties of covalent compounds includes:

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Answer:

m = 49.8 g

Explanation:

Hello there!

In this case, for this calorimetry processes we can define the involved heat in terms of mass, specific heat and temperature as shown below:

\(Q=mC\Delta T\)

Thus, given the heat, final and initial temperature and specific heat of water (4.184), the mass of water can be computed as shown below:

\(m=\frac{Q}{C\Delta T}\\\\m=\frac{12500J}{4.184\frac{J}{g\°C}(75\°C-15.0\°C)} \\\\m=49.8g\)

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Answer:

Explanation:

Yes

Answer:

it was based on the studies by emission line spectra of various elements

Explanation:

Answer:

The answer is: emission line spectra of various elements

Explanation:

Answer:

The epic emotional journey of a suburban African American family as they navigate love, forgiveness and coming together in the wake of a tragic loss.

Explanation:

hope thsi helps if so please brainliest

Merry Christmas

The term that refers to the passing of a wave through an object is "transmission."

Transmission refers to the process by which a wave passes through an object or medium. In the context of sound, transmission occurs when sound waves travel through different substances, such as air, water, or solids.

When a sound wave encounters an object, it can be transmitted through it, reflected off it, or absorbed by it, depending on the properties of the object and the medium through which the sound is traveling.

For example, when you speak into a microphone, the sound waves produced by your voice travel through the air and are transmitted to the microphone's diaphragm. The diaphragm converts the sound waves into electrical signals, which can then be amplified and reproduced as sound through speakers.

In summary, transmission is the term used to describe the passage of a wave, such as a sound wave, through an object or medium. It is an essential concept in understanding how waves interact with their surroundings and how sound propagates through different materials.

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Explanation:

Human cultures, as communities of individuals, form when boundaries begin to occur within such communities, and when, through both adaptive and neutral mechanisms, the traits of each community—from language to decoration to technology—begin to diverge.

Societies are formed of our social groupings at varied levels, from small towns, through countries, to broader cultural groupings such as a Western society. Within such societies people tend to form particular cultures, formed of the ideas, customs, and social behaviors that make one society distinct from another.

The number of grams of ammonium nitrate (NH₄NO₃) it would take for all the barium hydroxide to react is 18.7g

First, we will write the balanced chemical equation for the reaction

The balanced chemical equation for the reaction is

Ba(OH)₂ + 2NH₄NO₃ → 2NH₄OH + Ba(NO₃)₂

This means, 1 mole of barium hydroxide is required to react with 2 moles of ammonium nitrate

Now, we will calculate the number of moles of barium hydroxide present.

Mass of barium hydroxide (Ba(OH)₂) = 20 g

Using the formula

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

Molar mass of Ba(OH)₂ = 171.34 g/mol

∴ Number of moles of Ba(OH)₂ present =\(\frac{20}{171.34}\)

Number of moles of Ba(OH)₂ present = 0.116727 mole

Now,

Since 1 mole of barium hydroxide is required to react with 2 moles of ammonium nitrate

Then,

0.116727 mole of barium hydroxide will react with 2 × 0.116727 mole of ammonium nitrate

2 × 0.116727 = 0.233454 mole

∴ Number of moles of NH₄NO₃ required is 0.233454 mole

Now, for the mass of ammonium nitrate (NH₄NO₃) required

From the formula

Mass = Number of moles × Molar mass

Molar mass of NH₄NO₃ = 80.043 g/mol

∴ Mass of NH₄NO₃ required = 0.233454 × 80.043

Mass of NH₄NO₃ required = 18.68636 g

Mass of NH₄NO₃ required ≅ 18.7g

Hence, the number of grams of ammonium nitrate (NH₄NO₃) it would take for all the barium hydroxide to react is 18.7g

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The Formal charge is present on carbon which is +1. It has a triangular planer shape with sp2  hybridization- the concept of mixing two atomic orbitals to give rise to a new type of hybridized orbitals.

valence electron is an elementary particle in an atom's outer shell that really can take part in the development of a chemical bond if the outer layer is not shutdown. Both atoms inside a single covalent bond make a contribution each valence electron to create a shared pair. Valence electrons are ionic found in an organism's outermost shell. So because electrons in the outermost shells of two or more atoms are the first to come into contact with each other and decide how an atom might very well respond in a chemical process when two or more atoms interact. Numerous important molecules in your body, such as proteins, DNA, RNA, sugars, and fats, are composed of carbon atoms.

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Bile increases the surface area of the fats so that it can be digested. Option A

The liver produces bile, a greenish-yellow liquid that is kept in the gallbladder. It is critical for the small intestine's involvement in the breakdown of lipids.

Hormones tell the gallbladder to release bile into the duodenum, which is the first section of the small intestine, when food with fat enters the small intestine. Bile salts, which serve as emulsifiers, are found in bile.

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6.02 x \(10^{20\) formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

To convert formula units of MgCl₂ to moles of MgCl₂, we need to use Avogadro's number, which relates the number of formula units to the number of moles.

Avogadro's number (NA) is approximately 6.022 x 10^23 formula units per mole.

Given that we have 6.02 x 10^20 formula units of MgCl₂, we can set up a conversion factor to convert to moles:

(6.02 x 10^20 formula units MgCl₂) * (1 mol MgCl₂ / (6.022 x 10^23 formula units MgCl₂))

The formula units of MgCl₂ cancel out, and we are left with moles of MgCl₂:

(6.02 x 10^20) * (1 mol / 6.022 x 10^23) = 0.1 mol

Therefore, 6.02 x 10^20 formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

It's important to note that this conversion assumes that each formula unit of MgCl₂ represents one mole of MgCl₂. This is based on the stoichiometry of the compound, where there is one mole of MgCl₂ for every one formula unit.

Additionally, this conversion is valid for any substance, not just MgCl₂, as long as you know the value of Avogadro's number and the number of formula units or particles you have.

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The statement that accurately describes the photoelectric effect is Shining a HIGH frequency light over a metal will cause ELECTRONS to be ejected. That is option B.

Photoelectric effect is defined as the process by which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation.

The photoelectric effect can also be defined as the ejection of electrons from a metal plate when light falls on it.

Therefore, statement that accurately describes the photoelectric effect is Shining a HIGH frequency light over a metal will cause ELECTRONS to be ejected.

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To calculate the number of molecules in a given amount of a substance, we need to know the molar mass of the substance and use Avogadro's number.

Given:

Amount of nitrogen dioxide (NO2) = 78.54 g

To determine the number of molecules, we'll follow these steps:

Calculate the number of moles of nitrogen dioxide:

Number of moles = Mass / Molar mass

The molar mass of nitrogen dioxide (NO2) can be calculated as follows:

Molar mass of NO2 = (Molar mass of N) + 2 × (Molar mass of O)

The molar masses are:

Molar mass of N = 14.01 g/mol

Molar mass of O = 16.00 g/mol

Molar mass of NO2 = 14.01 g/mol + 2 × 16.00 g/mol = 46.01 g/mol

Plugging in the values, we have:

Number of moles = 78.54 g / 46.01 g/mol

Calculate the number of molecules:

Number of molecules = Number of moles × Avogadro's number

Avogadro's number = 6.022 × 10^23 molecules/mol

Plugging in the values, we have:

Number of molecules = Number of moles × Avogadro's number

Now, let's calculate:

Number of moles = 78.54 g / 46.01 g/mol ≈ 1.7078 mol

Number of molecules = 1.7078 mol × 6.022 × 10^23 molecules/mol

Number of molecules ≈ 1.028 × 10^24 molecules

Therefore, approximately 1.028 × 10^24 molecules are present in 78.54 grams of nitrogen dioxide (NO2).

Answer:

Neither accurate not precise

From the ideal gas law, the pressure of the gas is 106 kPa.

First we must obtain the number of moles of the gas;

Number of moles = mass/molar mass

Molar mass of fluorine gas = 38 g/mol

Number of moles of F2 = 6.40 g/38 g/mol = 0.168 moles

Using the ideal gas equation;

PV = nRT

P = ?

V = 3.90 L

n =  0.168 moles

T = 25.0 ⁰C + 273 = 296 K

R = 8.314  kPa L K-1 mol-1

Substituting values;

P = nRT/V

P =  0.168 moles × 8.314  kPa L K-1 mol-1 ×  296 K/3.90 L

P = 106 kPa

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The pressure of the vessel at a temperature of 25 °C is 106.73 KPa

We'll begin by calculating the number of mole of fluorine gas. This can be obtained as follow:

Mass of F₂ = 6.40 g

Molar mass of F₂ = 19 × 2 = 38 g/mol

Mole = mass / molar mass

Mole of F₂ = 6.40 / 38

Finally, we shall determine the pressure. This can be obtained as follow:

Volume (V) = 3.90 L

Temperature (T) =  25.0 °C = 25 + 273 = 298 K

Mole of F₂ (n) = 0.168 mole

Gas constant (R) = 8.314 L.KPa/Kmol

PV = nRT

P × 3.9 = 0.168 × 8.314 × 298

P × 3.9 = 416.232096

Divide both side by 3.90

P = 416.232096 / 3.90

Therefore, the pressure of the vessel is 106.73 KPa

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Answer: asd asd asd asdasdasdasd

Early "chemists" focused on practical problems - the production of dyes and perfumes, the production of soap, the use of metals, the production of glass, etc. The goal was not to make sense of the physical world.

Tapputi (also known as Tapputi-Belatekallim, referring to the female attendants of the palace), believed to be the world's first recorded chemist and perfume maker, mentioned in a cuneiform tablet from Babylonian Mesopotamia, circa 1200 BC It is BC is mentioned.

Along with Lavoisier, Boyle, and Dalton, Berzelius is considered the father of modern chemistry. In 1828, using oxygen as a standard and fixing its weight at 100, he produced a table of relative atomic weights containing all the elements known at the time.

Very early chemists were often motivated primarily by achieving a particular goal or product. It didn't take a lot of theory to make perfume or soap, just a good recipe, and attention to detail. There was no standard way to name substances (and no periodic table we could all agree on).

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Answer: Cytosine, Thymine, Cytosine, Guanine (option A)

Explanation:

In DNA strands, you must use base-pairing rules to complete strands.

The base-pairing rules are:

Adenine (A) bonds with Thymine (T)

Guanine (G) bonds with Cytosine (C)

By using these rules, you can pair the sequence GAGC with CTCG

The sequence CTCG is also represented as the bases Cytosine, Thymine, Cytosine, and Guanine, making A the correct answer.

I hope this helps!

Answer:

See attachment

General Formulas and Concepts:

Reading a Periodic Table

Writing Electron Configurations

Quantum Numbers

Explanation:

Electron Configurations of Zr: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d²

When drawing out the Orbital Diagram, we need to follow Hund's Rule.

Answer:

the answer is 4.0moles

Explanation:

1mole of O2 produce 2moles of H2O/x mole will produce 8.0moles of H2O then the answer is 4.0moles.

An electron domain is A lone pair. Option A.

The electron domain is the space around the atom where electrons are most likely to reside. A domain is a specific subject control or ownership. In the context of electrons, a domain is a space around an atom where electrons are most likely to reside. An atom's electronic domain is the number of unshared electron pairs or chemical bonding sites, that surround the atom.

Represents the number of sites expected to contain electrons. Knowing the electronic domains of each atom in a molecule allows us to predict its shape. In a double or triple bond, all electrons shared between these two atoms are on the same side of the central atom. They, therefore, count as one electronic domain. The central atom of this molecule, A, has four electronic domains.

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The density of the cake in grams/cm3 if it is in a 9.0 X 13 inch pan and in an inch tall and weighs 3.4 pounds is 5.189g/cm³.

This is a term which is referred to as the mass of a unit volume of a material substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume.

The mass is 3.4 pounds which must be converted to grams. One pound is equal to 453.592 grams therefore  3.4pound = 3.4 pounds × 453.592 = 1542.2g.

9.0 X 13 inch pan and in an inch tall  therefore the volume is 117inch³ when converted to cm will be  117inch³ × 2.54 = 297.18cm³ .

Density = mass/volume

      = 1542.2g / 297.18cm³  = 5.189g/cm³.

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The correct answer is A. 2 iron(II), 3 chloride, that is  2 iron(II) ions and 2 chloride ions will bond to form an ionic compound

In an ionic compound, the total positive charge of the cations should balance the total negative charge of the anions. Iron(II) is a cation with a charge of +2 (Fe2+), while chloride is an anion with a charge of -1 (Cl-).

We need to balance the charges and hence need to determine the least common multiple (LCM) of the charges. The LCM of +2 and -1 is 2. Therefore, we need two chloride ions (2 x -1 = -2) to balance the charge of one iron(II) ion (+2).

Hence, for each ionic compound formed, we would need 2 iron(II) ions and 2 chloride ions to achieve charge neutrality. Therefore, the correct answer is A. 2 iron(II), 3 chloride.

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At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

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The value of the solubility product constant (Ksp) for the salt AB at 25°C is 2.60 x 10⁻³.

The solubility product constant (Ksp) is the equilibrium constant for the dissolution of a sparingly soluble salt in water. It is given by the expression Ksp = [A⁺][B⁻] where [A⁺] and [B⁻] are the molar concentrations of the cations and anions in solution, respectively.

In this case, the balanced equation for the dissolution of the salt AB is: AB(s) ⇌ A⁺(aq) + B⁻(aq) We know that at 25°C, only 0.0510 mol of the salt AB is soluble in 1.00 L of water. This corresponds to a molar solubility of

s = 0.0510 mol / 1.00 L = 0.0510 M

At equilibrium, the molar concentration of A⁺ and B⁻ will also be 0.0510 M. Therefore, the value of Ksp for the salt AB at 25°C can be calculated as: Ksp = [A⁺][B⁻] = (0.0510 M) * (0.0510 M) = 2.60 x 10⁻³.

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➢ A neutralization reaction can be defined as a chemical reaction in which an acid and base quantitatively react together to form a salt and water as products.

➢In a neutralization reaction, there is a combination of H+ ions and OH– ions which form water. A neutralisation reaction is generally an acid-base neutralization reaction.

Neutralization Reaction Equation:-

Neutralization Reaction Examples:-

________________________________

Answer: A reaction that removes essentially all H+ and OH-

Explanation:

Answer:

it 3

Explanation: