Given the information below, determine the crystal structure. Consider only FCC and BCC structures as possibilities.Lattice parameter a = 0.4997 nmPowder x-ray: λ = 0.1542 nm2θ (°) Constructive Interference 31.0, 36.0, 51.8, 61.6, 64.8

Answer:

A measure of an element's identity is determined by its atomic number, and its weight is determined by its atomic mass.

Explanation:

The amount of protons in the nucleus of an element's atom is known as the element's atomic number. It serves to identify and categorize the elements in the periodic table and is particular to each element. The chemical characteristics of an element are determined by its atomic number.

An element's atomic mass is its average atom's mass, which is typically expressed in atomic mass units (amu). It is the total number of protons and neutrons in the nucleus of an atom. The atomic mass can be a decimal and is not always a  number.

A measure of an element's identity is determined by its atomic number, and its weight is determined by its atomic mass.

Answer:

\(Kb=6.16x10^{-7}\)

Explanation:

Hello,

In this case, given the pH of the base, we can compute the pOH as shown below:

\(pOH=14-pH=14-10.781=3.219\)

Next, we compute the concentration of the hydroxyl ions when the triethanolamine is dissociated:

\(pOH=-log([OH^-])\)

\([OH^-]=10^{-pOH}=10^{-3.219}=6.04x10^{-4}M\)

Then, by writing the equilibrium expression for the dissociation of triethanolamine we have:

\(Kb=\frac{[OH^-][C6H14O2N^+]}{[C6H15O3N ]}\)

That is suitable for the direct computation of Kb, knowing that based on the ICE procedure, \(x\) equals the concentration of hydroxyl ions that was previously, computed, therefore, we have:

\(Kb=\frac{6.04x10^{-4}M*6.04x10^{-4}M}{0.592M-6.04x10^{-4}M}\\ \\Kb=6.16x10^{-7}\)

Regards.

Physical change: a new substance is not produced.

Chemical change: produces a new substance.

The substance x has one white dot, two black dots and one white again.

W - B - B - W.

If we look at the change 1 we can see that we have one green, two black and another green.

Is it possible to have one green atom? What does that mean? It means that we have another atom there. The problem says that the sample is in a sealed box, so that no matter can enter or leave. So in my opinion the first one is impossible.

In the second change I can't decide between physical and chemical. I think it is a chemical change because there is a rearrengement.

In the third change there are 12 molecules, Each molecule has two black atoms and 4 white atoms. In the substance x only had 24 white atoms, but in the change 3 we have 48 white atoms. As we said before the sample is in a sealed box, so that no matter can enter or leave. So it also impossible.

Answer:

all of the above

Explanation:

i got the answer right on cK-12

Answer:

rx-rbi

Explanation:

cause i know it

Answer:

heat energy

Explanation:

Conduction is the transfer of heat energy from one substance to another or within a substance.

HCN, Na2SO4: Combination of compounds.

Mg3N2: Chemical compound.

CO2, H2O: Dissolution or hydration reaction.

Cu, Zn(NO3)2: Single-replacement reaction.

Na, N2: Combination of elements.

Let's analyze each chemical combination to determine the type of reaction involved:

HCN, Na2SO4:

The combination of hydrogen cyanide (HCN) and sodium sulfate (Na2SO4) does not represent a specific chemical reaction. It is simply the combination of two compounds.

Mg3N2:

Mg3N2 represents a chemical compound, magnesium nitride. It does not indicate a specific reaction.

CO2, H2O:

The combination of carbon dioxide (CO2) and water (H2O) represents a chemical reaction known as hydration or dissolution. When carbon dioxide dissolves in water, it forms carbonic acid (H2CO3), which can further dissociate into hydrogen ions (H+) and bicarbonate ions (HCO3-).

Cu, Zn(NO3)2:

The combination of copper (Cu) and zinc nitrate (Zn(NO3)2) represents a single-replacement reaction. Copper displaces zinc from the compound, resulting in the formation of copper nitrate (Cu(NO3)2) and zinc metal (Zn).

Na, N2:

The combination of sodium (Na) and nitrogen gas (N2) does not represent a specific reaction. It is simply the combination of two elements.

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Answer:

B. The reaction rate decreases.

Explanation:

When a chemical reaction releases energy it is called Exothermic Reaction.

hope it helps!

When a chemical reaction energy releases then this type of reaction is called exothermic reaction. In this reaction energy is release to the atmosphere.

In chemistry there are various type of reaction out of which the two main types are the exothermic reaction and endothermic reaction.

Exothermic reaction is the one in which energy releases in form of heat respiration reaction is an example of exothermic reaction. In respiration food that we eat are broken down in glucose with release of energy.

Endothermic reaction is the one in which energy is taken out during the reaction. Photosynthesis is an example of endothermic reaction where sunlight energy is taken by the plants to make food.

Thus when a chemical reaction releases energy these reactions are called exothermic reaction.

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Answer:

1.306 × 10^24 formula units.

Explanation:

The chemical equation of this qkrstios as follows:

Fe + 2H2O → FeO2 + 2H2

Based on the reaction, 2 mole of H2O produces 1 mole of FeO2

Using the formula as follows;

Mole = mass/molar mass

Molar mass of H2O = 1(2) + 16 = 18g/mol

mole = 78/18

mole = 4.33moles

If 2 mole of H2O reacts to produce 1 mole of FeO2

4.33 moles of H2O will produce 4.33/2 = 2.17moles of FeO2.

To convert moles to formula units, we multiply number of moles by Avagadro number (6.02 × 10^23 units)

= 2.17 moles × 6.02 × 10^23 units

= 13.06 × 10^23

= 1.306 × 10^24 formula units.

Answer:

Argon would be the correct choice.

Explanation:

Silicon has a total of 14 protons. If 4 protons would be added, you would now have argon, the 18th element.

The given solution is a saturated solution. A homogeneous mixture composed of two or more substances is called a solution.

In a solution, there are two primary components, which are termed as,

At a given temperature and pressure, every solvent is capable of dissolving a particular amount of solute in it.

If a solution has dissolved less amount of solute than it is capable of dissolving, then the solution is known as an unsaturated solution.

If a solution has dissolved as much as it is capable of dissolving, then the solution is known as a saturated solution.

If a solution has dissolved more amount of solute than it is capable of dissolving, then the solution is known as a supersaturated solution.

In the given problem, when the solute crystals are added to the solution, they sink and remain on the bottom of the beaker.

Hence, the given solution is saturated.

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Answer:

oxidize

Explanation:

Answer:

0.99 μmol/L

Explanation:

From the question given above, the following data were obtained:

Volume of stock solution (V₁) = 20 mL

Concentration of stock solution (C₁) = 18.8 μmol/L

Volume of diluted solution (V₂) = 380 mL

Concentration of diluted solution (C₂) =?

The concentration of the diluted solution can be obtained as follow:

C₁V₁ = C₂V₂

18.8 × 20 = C₂ × 380

376 = C₂ × 380

Divide both side by 380

C₂ = 376 / 380

C₂ = 0.99 μmol/L

Therefore, the concentration of the diluted solution the chemist is working on is 0.99 μmol/L

The numerical value of Kc for the given reaction, with the equilibrium mixture containing 0.0450 M PCl3, 0.116 M Cl2, and 25.8 M PCl5, is approximately 4942.03.

To calculate the numerical value of Kc for the given reaction, we need to set up an expression for the equilibrium constant using the concentrations of the species involved.

The balanced equation for the reaction is:

PCl3 (g) + Cl2 (g) ⇌ PCl5 (g)

The equilibrium constant expression, Kc, is given by:

Kc = [PCI5] / ([PCl3] * [Cl2])

Given the equilibrium concentrations:

[PCl3] = 0.0450 M

[Cl2] = 0.116 M

[PCI5] = 25.8 M

Substituting these values into the equilibrium constant expression, we have:

Kc = (25.8 M) / ((0.0450 M) * (0.116 M))

Calculating Kc:

Kc = 25.8 M / (0.00522 M^2)

Kc = 4942.03

Therefore, the numerical value of Kc for the given reaction, with the equilibrium mixture containing 0.0450 M PCl3, 0.116 M Cl2, and 25.8 M PCl5, is approximately 4942.03.

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To prepare a 1.000 L of 0.500 M maltose solution, we first need to calculate the mass of maltose required and then dissolve it in water to make the final solution.

Calculate the mass of maltose needed. The formula for molarity is M = moles/L. Rearrange the formula to solve for moles: moles = M * L. In this case, moles = 0.500 M * 1.000 L = 0.500 moles.

Next, calculate the molar mass of maltose. The formula for molar mass is M = mass/moles. Rearrange the formula to solve for mass: mass = M * moles.

The molar mass of maltose is (12.01 g/mol * 12) + (1.008 g/mol * 22) + (16.00 g/mol * 11) = 342.30 g/mol. Therefore, the mass of maltose needed is 342.30 g/mol * 0.500 moles = 171.15 g.

Measure out 171.15 g of maltose using a balance.  Then dissolve the maltose in a small amount of distilled water in a volumetric flask. Add more distilled water until the volume reaches 1.000 L.

Mix the solution thoroughly to ensure that the maltose is fully dissolved.
Your 1.000 L of 0.500 M maltose solution is now ready for use in your experiment.

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An increased temperature generally causes a reaction to occur faster rather than slower. Therefore option C is correct.

The increased temperature leads to a higher average kinetic energy of the molecules, which results in more frequent and energetic collisions between the reactant particles.

This increased collision frequency and energy facilitate the breaking of chemical bonds and the formation of new bonds, leading to an accelerated reaction rate.

When the temperature is raised, the kinetic energy of the molecules increases. This means that the individual molecules move faster and possess a greater amount of energy. As a result, the molecules collide more frequently and with higher energy, enhancing the likelihood of successful collisions that lead to a reaction.

In summary, an increased temperature leads to a faster reaction rate by increasing the average kinetic energy of the particles, causing more frequent and energetic collisions.

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The energy of the wave is 2.11 * 10^-18 J while the energy per mole is 3.5 * 10^-42 J/mol.

We know that the energy of the photon is dependent on the wavelength of the light as we know. In this case, we can see that the wavelength of the light is obtained as 94 nm. We shall now proceed to find the parameters as required in the question.

We have the following;

E = hc/λ

E = energy of the radiation

h = Plank's constant

c = speed of light

λ = wavelength

Then we have;

E = 6.6 * 10^-34 * 3* 10^8/94 * 10^-9

E = 2.11 * 10^-18 J

The energy per mole is obtained from;

2.11 * 10^-18 J/6.02 * 10^23

= 3.5 * 10^-42 J/mol

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Answer: Attractive forces between particels

Explanation:

Answer:

Noun

1. An elevated region; plateau:

He moved to a highland far from the river.

2. highlands,  a mountainous region or elevated part of a country.

adjective

3: of, relating to, or characteristic of highlands.

Answer:

3 > 2> 1

Explanation:

Aromatic compounds undergo electrophilic substitution reaction which passes through a positively charged intermediate to yield the product.

Substituted benzenes may be more or less reactive towards electrophilic aromatic substitution than benzene molecule depending on the nature of the substituent.

Certain substituents increase the ease of reaction of benzene towards aromatic substitution.

If we look at the compounds closely, we will notice that toluene reacts readily with CH3Cl / AlCl3. This is because, the methyl group is electron donating hence it stabilizes the positively charged intermediate produced in the reaction.

Carbonyl compounds are electron withdrawing substituents hence they decrease the magnitude of the positive charge and hence decrease the rate of electrophilic aromatic substitution.

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. The frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. However, for the photoelectric effect to occur, the frequency of the incident light must be above a certain threshold frequency.

The threshold frequency is the minimum frequency of light required to dislodge electrons from the material. Below this threshold frequency, regardless of the intensity or duration of the light, no electrons will be emitted.

This behavior can be explained by the particle-like nature of light, where light is composed of discrete packets of energy called photons. The energy of a photon is directly proportional to its frequency. Only photons with energy greater than or equal to the binding energy of the electrons in the material can dislodge them.

Therefore, the frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

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The original mass of Tritium (hydrogen-3) was 13.4mg if its current mass is 0.42 micrograms.

The formula for radioactive decay is given by:

N = N0 x (1/2)^(t/T)

where,

N = final number of radioactive atoms

N0 = initial number of radioactive atoms

t = time elapsed

T = half-life of the radioactive substance

Let's substitute the given values into the formula:

0.42 μg = N0 x (1/2)^(60/12)

0.42 μg = N0 x (1/2)^5

0.42 μg = N0 x 1/32

N0 = 0.42 μg x 32

N0 = 13.44 μg

Therefore, the original mass of the tritium sample was 13.44 micrograms.

What is radioactive decay?

Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting ionizing radiation, such as alpha particles, beta particles, and gamma rays. This process can result in a change in the number of protons and/or neutrons in the nucleus, leading to the transformation of one element into another. The rate of decay is typically characterized by a half-life, which is the time required for half of the atoms in a sample to decay.

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Answer:

2 AlCl₃ + 3 Pb(NO₃)₂ ---> 2 Al(NO₃)₃ + 3 PbCl₂

Explanation:

This is a double-displacement reaction. The general structure of these reactions are:

AB + CD ----> AD + BC

In these reactions, the cation of one molecule is swapped with the cation of another molecule. To find the products, you first need identify the charge on each ion. This is important to know so that you can balance the new molecule via subscripts.

AlCl₃ = Al³⁺ and Cl⁻

Pb(NO₃)₂ = Pb²⁺ and NO₃⁻

Therefore, one of the new products should be a combination of Al³⁺ and NO₃⁻ and the other should be Pb²⁺ and Cl⁻. An easy way to balance the charges in the new molecules is to the make the charge on the cation the subscript of the anion (and vice versa). For instance, since Pb has a +2 charge, the chlorine should have a 2 subscript.

The unbalanced equation:

AlCl₃ + Pb(NO₃)₂ ---> Al(NO₃)₃ + PbCl₂

Reactants: 1 aluminum, 3 chlorine, 1 lead, 2 nitrate

Products: 1 aluminum, 2 chlorine, 1 lead, 3 nitrate

The balanced equation:

2 AlCl₃ + 3 Pb(NO₃)₂ ---> 2 Al(NO₃)₃ + 3 PbCl₂

Reactants: 2 aluminum, 6 chlorine, 3 lead, 6 nitrate

Products: 2 aluminum, 6 chlorine, 3 lead, 6 nitrate

The Vapor pressure is inversely proportional to the intermolecular force.

What is vapor pressure?

The term "vapor pressure of a liquid" refers to the force applied to the liquid's surface by its vapors when they are in equilibrium with one another.

What is excited state?

An excited state of an electron is one in which it is momentarily in an energy state higher than its ground state. When an electron receives additional energy, such as when it absorbs a photon, or packet, of light, or when it collides with an atom or particle nearby, the electron can become excited.

Strong intermolecular forces

High boiling point

High viscosity

High surface tension

Weak intermolecular forces

High vapor pressure

Boiling point, viscosity and surface tension is directly proportional to the intermolecular force

Therefore, Vapor pressure is inversely proportional to the intermolecular force.

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ANSWER

EXPLANATION

To determine the ratio of LiOH to CO2, follow the steps below

Step 1: Write the balanced equation of the reaction

From the above reaction, you will see that 2 moles of LiOH react with 1 mole of CO2

Hence, the coefficient of LiOH in the reaction is 2, and the coefficient of CO2 is 1

Step 2: Find the mole ratio of LiOH to CO2

Answer:

The answer is D

Explanation:

The hornwort is telling what that exact plant does and the kangaroo paw is telling what they do physically to hold onto water

The first adaptation is to the life cycle, and the second is to the physical traits thus, the kangaroo paw describes what they physically do to hold onto water, and the hornwort describes what that particular plant performs. So, the correct option is D.

A species or organism gradually grows more accustomed to its surroundings through the process of adaptation. The behavioral or physical characteristics of an animal that improve its ability to thrive in its ecosystem are referred to as adaptation. Animals can adapt by changing how they look to hide from predators (camouflage). To survive in their habitats, different species have evolved various adaptations.

In the above given example, the life cycle is the first adaptation, and the physical characteristics are the second. Therefore, the hornwort defines what that particular plant does, and the kangaroo paw represents what they physically do to hold onto water.

Therefore, the correct option is D.

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Answer:

this would be c consumers as they all eat plants and/or meat

Explanation:

Answer:

(B) Herbivores.

Explanation:

Producers are plants and herbivores eat plants, and not meat, nor other animals, nor make their own food. I hope this helps good luck.