interstellar gas is composed mainly of group of answer choices ammonia, methane, and water vapor. some hydrogen, but mainly carbon dioxide. only hydrogen. 90% hydrogen, 9% helium by weight. 10% hydrogen, 90% helium by numbers of atoms.

The cell notation for the electrochemical cell with a Pb(s) anode oxidized to Pb²⁺(aq) and a platinum electrode cathode where Fe³⁺(aq) is reduced to Fe²⁺(aq) is:

Pb(s)|Pb²⁺(aq, 1M)||Fe³⁺(aq, 1M), Fe²⁺(aq, 1M)|Pt(s)

The cell notation for the given electrochemical cell can be represented as follows:

Pb(s)|Pb²⁺(aq, 1M)||Fe³⁺(aq, 1M), Fe²⁺(aq, 1M)|Pt(s)

In this notation, the single vertical line "|" represents a phase boundary, while the double vertical lines "||" represent the salt bridge that connects the two half-cells. The anode (where oxidation occurs) is written on the left, and the cathode (where reduction occurs) is written on the right.

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The magnitude of the angular acceleration of the disk is -203.9 rad/s^2 (negative sign is indicating the direction of angular acceleration is opposite to the direction of applied forces).

The magnitude of the angular acceleration of the disk can be determined by using the equation for torque:

τ = Iα

where τ is the torque, I is the moment of inertia, and α is the angular acceleration.

The moment of inertia of a solid disk is given by the equation:

I = (1/2) * m * r^2

where m is the mass and r is the radius of the disk.

So we can substitute the values of mass and radius in the equation of the moment of inertia:

I = (1/2) * 24.3 kg * (0.314 m)^2 = 0.03898 kg*m^2

Now we can calculate the torque caused by the forces of 90 n and 125 n. These forces are applied in opposite direction so the net torque caused by them is:

τ = 90 N * 0.314 m - 125 N * 0.314 m = -7.922 Nm

So we can now calculate the angular acceleration using the torque equation:

-7.922 Nm = 0.03898 kgm^2 * α

α = -7.922 Nm / 0.03898 kgm^2 = -203.9 rad/s^2

Therefore, The magnitude of the angular acceleration of the disk is -203.9 rad/s^2 (negative sign is indicating the direction of angular acceleration is opposite to the direction of applied forces).

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the second option would most likely be found in a cell phone advertisement!

Answer: the answer is b

Explanation: cuz i said so

Answer:

Geothermal energy.

Explanation:

Answer:

1.14 M

Explanation:

Step 1: Calculate the moles corresponding to 317 g of calcium chloride (solute)

The molar mass of calcium chloride is 110.98 g/mol.

317 g CaCl₂ × 1 mol CaCl₂/110.98 g CaCl₂ = 2.86 mol CaCl₂

Step 2: Calculate the molarity of the solution

Molarity is equal to the moles of solute divided by the liters of solution.

M = moles of solute / liters of solution

M = 2.86 mol / 2.50 L = 1.14 mol/L = 1.14 M

A) structural formula

On edge

Answer:

A

Explanation:

Answer: 17.49L

Explanation:

STP is 1atm and 273.15K

V=nRT/

V=(0.78)(0.0821)(273.15)/1

V= 17.49L

Answer:

5 point) Chemists used systems and order because they study the basic unit of all forms of matter, which is the atom . However, there are several different kinds of atoms, called elements . Chemists organize these elements using the periodic table .

Explanation:

Answer:

5.17×10^21 ng

Explanation:

I assume you meant Tg if yes, the answer is this:

T is 10^12

5.17 Tg is 5.17×10^12 g

and n is 10^-9. but as we're converting g to ng, we don't include the - .

so now all we have to do is to put them all together!

5.17×10^12×10^9= 5.17×10^21 ng

if anything is unclear, ask me.

Answer:

\( \fbox{0.3125 M}\)

Given:

To find:

Molarity = ?

Solution:

Molarity is nothing but the number of moles of solute dissolved in per litre of solution. given by formula,

\(Molarity = \frac{given \: mass}{molar \: mass \times Volume}\)

\( \sf Molarity \: = \frac{30}{40 \times 2.4} = 0.3125 \: M\)

\( \small\sf Thanks \: for \: joining \: brainly \: community!\)

Answer:

C, Si, Al

Explanation:

We use periodic trends to help us find the atomic radii. The trend for atomic radii on the Periodic Table of Elements is down and to the left. So whichever elements are furthest to the left and farthest down have the largest atomic radii.

The property or aspect of carbon that makes it so important to life on earth is that it can form four (4) covalent bonds.

Carbon is the fourth most abundant element in the universe and is the building block of all known life forms. Carbon's ability to form four covalent bonds is the characteristic that distinguishes it from other elements and makes it the basic building block of life on Earth.

Because of carbon's unique properties, it is found in all organic molecules, including proteins, carbohydrates, and lipids, which are the building blocks of life. Carbon is also found in nucleic acids, the molecules that encode genetic information, and is essential to the functioning of cells and organisms.

Thus, the ability of carbon to form four covalent bonds makes it crucial to the formation of complex molecules that are essential to life.
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Answer:6.02

Explanation:

Answer:

there are about 6 atoms in hydrogen

Answer:

Beryllium has 2 dots and Carbon has 4

Answer:

There are 0.0305 calories in 0.128 joules

Explanation:

Given that,

Heat absorbed, Q = 0.128 J

We need to find the heat energy absorbed in calories.

We know that the relation between joules and calories is as follows :

1 calorie = 4.184 J

1 J = (1/4.184) J

So,

\(0.128\ J=\dfrac{0.128 }{4.184}\\\\=0.0305\ cal\)

So, there are 0.0305 calories in 0.128 joules

Answer:

Approximately \(4.5\; \text{hours}\).

Explanation:

Calculate the ratio between the mass of this sample after \(22.5\; \text{hours}\) and the initial mass:

\(\displaystyle \frac{5.70\; \rm g}{182.4\; \rm g} \approx 0.03125\).

Let \(n\) denote the number of half-lives in that \(22.5\; \text{hours}\) (where \(n\!\) might not necessarily be an integer.) The mass of the sample is supposed to become \((1/2)\) the previous quantity after each half-life. Therefore, if the initial mass of the sample is \(1\; \rm g\) (for example,) the mass of the sample after \(\! n\) half-lives would be \({(1/2)}^{n}\; \rm g\). Regardless of the initial mass, the ratio between the mass of the sample after \(n\!\!\) half-lives and the initial mass should be \({(1/2)}^{n}\).

For this question:

\({(1/2)}^{n}} = 0.03125\).

Take the natural logarithm of both sides of this equation to solve for \(n\):

\(\ln \left[{(1/2)}^{n}}\right] = \ln (0.03125)\).

\(n\, [\ln(1/2)] = \ln (0.03125)\).

\(\displaystyle n = \frac{\ln(0.03125)}{\ln(1/2)} \approx 5\).

In other words, there are \(5\) half-lives of this sample in \(22.5\; \text{hours}\). If the length of each half-life is constant, that length should be \((1/5) \times 22.5\; \text{hours} = 4.5\; \text{hours}\).

The number of silver atoms does not change when time advances each second.

Silver atoms are indivisible units of matter, and they cannot be created or destroyed through ordinary chemical or physical processes. Therefore, the number of silver atoms in a given sample will remain constant over time, regardless of any changes in the conditions surrounding the sample.

In order for the number of silver atoms to change over time, there would need to be some kind of nuclear reaction or decay occurring within the sample. However, these processes are typically not relevant for most everyday scenarios involving silver.  In general, the number of atoms in a given sample of a substance will remain constant as long as the sample is not undergoing any kind of chemical or physical transformation. For example, if you have a piece of solid silver metal, the number of atoms in that piece will remain constant over time as long as the metal is not exposed to any external factors (such as heat, radiation, or chemical reactions) that could cause it to change form.

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the change in entropy is approximately 4.0 x 10^(-23) J/K.

To calculate the change in entropy, we need to consider the initial and final states of the system. In this case, the system involves a Cl atom and a Br atom adsorbed onto a surface with 16 possible adsorption sites.

Initial state: Only the Cl atom is adsorbed, and it can occupy any of the 16 sites. The number of microstates (W1) for this initial state is 16.

Final state: Both the Cl and Br atoms are adsorbed, and each can occupy any of the 16 sites. Since the two atoms are distinguishable, the number of microstates (W2) for this final state is the product of the possible sites for each atom, which is 16 * 16 = 256.

Now, we can calculate the change in entropy (ΔS) using the Boltzmann's entropy formula:

ΔS = k * ln(W2/W1)

where k is the Boltzmann constant (1.38 x 10^(-23) J/K).

ΔS = (1.38 x 10^(-23) J/K) * ln(256/16)
ΔS ≈ 3.99 x 10^(-23) J/K

Rounding the answer to 2 significant digits, we have:

ΔS ≈ 4.0 x 10^(-23) J/K

So, the change in entropy is approximately 4.0 x 10^(-23) J/K.

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The definition of the law of definite proportions is that in any chemical compound, the mass ratio of its elements is constant.

The law of definite proportions is also called Proust's law or law of constant composition.

This law was discovered by Joseph Louis Proust.

This law helps to determined the correct mass of reactants and to use them efficiently.

This law helps to calculate the expected quantity of product given the masses of reactants.

This law is not dependent on chemical compound. It does not depend upon which phase is it in like liquid or gaseous or solid.

Example the water molecule is forms by one oxygen and 2 hydrogen molecules. No to her combination can form this substance of water.

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Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit. Stability is the reason that causes atoms  to bond together to form molecules.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. In the nucleus, proton and neutron are present.

Every atoms want to gain stability. To gain stability atoms have to gain noble gas configuration that is outermost shell must contain 2,8, 18 electrons. The atom should follow octet rule. Stability lowers the energy of an atom.

Therefore stability is the reason that causes atoms  to bond together to form molecules.

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Answer:

3.75g of Ni and 1.25g of Cu

Explanation:

The five-cent coin of Unit States has a mass of 5.000g. To find the mass of each atom we have to multiply the total mass times the percentage of each atom (Nickel and Copper). That is:

Mass Nickel:

5.000g * 75% = 3.75g of Ni

Mass Copper:

5.000g * 25% = 1.25g of Cu

Answer:

4

Explanation: it's a carbon atom right....soo it'll form 4 bonds(single)

An atom can form 4 single covalent bonds is carbon with two electron shell.

The bonds are defined as a strong bond that binds atoms, ions, or molecules together and promotes the production of molecules.

There are three types of bonds.

Covalent bonds are defined as the bond formed by sharing of electrons with each other.

Covalent bonding is a stable equilibrium of the attractive and repulsive forces between two atoms that occurs when they share electrons. Bonding pairs or sharing pairs are other names for these electron pairs.

It can also be defined as a type of chemical link where atoms share electrons to create electron pairs.

Covalent bonds  has low melting point, boiling point, enthalpy of fusion and enthalpy of vaporization.

Thus, an atom can form 4 single covalent bonds is carbon with two electron shell.

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About  58.0976 g mass of KOH is necessary to prepare 800 ml Ph = 11.56.

To prepare 800 mL of a solution with a pH of 11.56, you need to calculate the mass of potassium hydroxide (KOH) needed. To do this, use the formula:

Molarity (M) = moles of solute/liters of solution

M = (mass of solute (g) / molecular weight of solute (g/mol)) / liters of solution (L)

In this case, the molecular weight of KOH is 56.1 g/mol.

Therefore, the mass of KOH needed is:

M = (mass of solute (g) / 56.1 g/mol) / 0.8 L

Mass of KOH = (Molarity x 56.1 g/mol) x 0.8 L

Mass of KOH = (11.56 x 56.1 g/mol) x 0.8 L = 58.0976 g

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It will take approximately 6.81 years until the region is again habitable.

The half-life of radioactive cobalt is 5.27 years. This means that it takes 5.27 years for the level of cobalt radiation to reduce by half. If a nuclear accident has left the level of cobalt radiation in a certain region at 100 times the level acceptable for human habitation, then we can calculate how long it will take until the region is again habitable by using the natural decay model.
The natural decay model states that the amount of radioactive material left in a given sample will decrease exponentially as time passes. This means that we can use the equation:
A(t) = A(0) * e^(-kt)

where A(t) is the amount of radioactive material left at time t, A(0) is the initial amount of material at time 0, k is the decay constant and t is the time in years.
In our case, we want to find the time t when the amount of material A(t) is equal to the level acceptable for human habitation. To do this, we need to rearrange the equation and solve for t:
t = (ln(A(0)/A(t))/k)

where A(0) is the initial amount of material at time 0 (100 times the level acceptable for human habitation) and A(t) is the amount of material left at time t (the level acceptable for human habitation). Plugging in the values, we get:
t = (ln(100)/5.27)

This gives us a time of 6.81 years.

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Answer:

²⁸Mg

Explanation:

12 electrons means it is a Mg;

A typical Mg has 12 neutrons, but this has 16 hence it must be an isotope with 4 extra neutrons.

The sodium ion concentration in the cytoplasm of a neuron increases when its sodium channels open.

This is because the opening of the sodium channels allows for the influx of sodium ions into the cytoplasm, leading to an increase in the content-loaded sodium ion concentration within the cell. As a result, the cytoplasm becomes more positively charged, which can lead to the generation of an action potential and the transmission of a nerve impulse.

The sodium channel itself is the membrane protein that conducts sodium ions (Na⁺) through a cell membrane. It is highly selective to transport sodium ions, which it achieves by encapsulation of the ion in a cavity of a larger molecule.

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the density of concentrated sulfuric acid is 1.84 g/mL when a flask has a mass of 78.23 g when empty and 593.63 g when filled with water and later with sulfuric acid whose mass is 1026.57 g.

Given mass of flask mf = 78.23 g

Mass of flask when filled with water mfw =  593.63 g

Mass of water mw = mfw - mf = 593.63 - 78.23 = 515.4g

Volume of water Vw = Volume of acid Vc = 515.4mL

Mass of flask when filled with acid mfa = 1026.57 g

Mass of acid ma = mfa-mf = 1026.57 - 78.23 = 948.34g

Density = mass(ma)/volume of acid (Va)

= 948.34/515.4 = 1.84 g/mL

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Answer:

Ken is planting vegetables in his garden. He has 20 seeds. Determine whether 20 is prime or composite number. If it is composite, list all of the ways Ken can arrange the seeds in even rows.