An unknown substance has a density of 2.5g/ml. is this a physical or
chemical property? how do you know?
1 point
density is a chemical property because every substance has a unique density that we
can use to identify it.
density is a physical property because we can find it for a substance without
changing the identity of the substance.
o density is a chemical property because all chemicals have a density.
o density is a physical property because we can measure it.

Answer:

Question1: Isotopes, element, protons, neutrons. Question 2: W and Y

Explanation:

An Isotope is atoms of the same element that have a different amount of neutrons.

Both are Carbon atoms, but their Atomic Masses are different, and Atomic Masses are made up of Protons and Neutrons, which proves this!

Hope this helps! :D

The factors that one must consider to determine the sign of δs for the reaction 2N2O(g) ⟶ 2N2(g) + O2(g) if it occurs at constant temperature are given below The sign of ΔS°rxn depends on the sign of the entropy change associated with the production of products from reactants.

The reaction is expected to be spontaneous if the change in entropy is positive. If the entropy change is negative, the reaction is not feasible spontaneously. To determine the sign of ΔS°rxn for a reaction, one must examine the entropy changes that occur when the reactants are converted into products. Consider of chemical reactions In the above chemical reaction, reactants 2N2O(g) are transformed into products N2(g) and O2(g). The entropy of the substances before and after the reaction is represented by ΔSrxn.ΔSrxn = ΔS°rxnΔS°rxn can be determined by using the equation below:ΔS°rxn = ΣS°(products) − ΣS°(reactants)S° is molar entropy, and Σ denotes the sum of all molar entropies. S° values for elements are measured as 0 J/mol· K, according to the Third Law of Thermodynamics.

The entropy of the compound can be determined by summing the molar entropy values of each element in the compound. To determine the sign of ΔSrxn, use the following guidelines If the number of moles of reactants is higher than the number of moles of products, the reaction's entropy change is negative, and the reaction is considered spontaneous in the reverse direction. This reaction is exothermic. If the number of moles of products is higher than the number of moles of reactants, the reaction's entropy change is positive, and the reaction is considered spontaneous. This reaction is endothermic .In this case, we can see that the number of moles of products is higher than the number of moles of reactants, hence the reaction is spontaneous.

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Answer:

don't no answer

Explanation:

d don't no answer

The final concentration of the solution, when water is added, would be 0.033 M.

To calculate the final concentration of a solution when water is added, we need to consider the initial concentration and the volume before dilution, as well as the volume of water added. The final concentration is determined by the ratio of the initial solute concentration to the total volume of the solution after dilution.

The formula to calculate the final concentration (Cf) is:

Cf = (Ci * Vi) / (Vi + Vw)

Where:

Cf = Final concentration

Ci = Initial concentration

Vi = Initial volume

Vw = Volume of water added

Let's consider an example. Suppose we have a solution with an initial concentration of 0.1 M and an initial volume of 100 mL. If we add 200 mL of water to this solution, we can calculate the final concentration as follows:

Cf = (0.1 M * 100 mL) / (100 mL + 200 mL)

Cf = (0.1 M * 100 mL) / 300 mL

Cf = 0.033 M

In summary, to calculate the final concentration of a solution when water is added, we use the formula Cf = (Ci * Vi) / (Vi + Vw), where Ci is the initial concentration, Vi is the initial volume, and Vw is the volume of water added. The final concentration is determined by the ratio of the initial solute concentration to the total volume of the solution after dilution.

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Answer:

O by excretion of waste and the death of the top consumer

Explanation:

The top consumers in the food web pass energy and matter back to the next trophic level when they excrete waste products and also when they die.

Excretion is the passing out of waste materials of metabolism.

During the death of an organism, organic materials are liberated back into the ecosystem. Carbon is released into the soil, carbon dioxide into the atmosphere etc.

These materials are then recycled back into the ecosystem by the activities of plant and special organisms called decomposers. These organisms feed on dead animals especially.

The ionization constant of H₂S is approximately 1.0 x 10⁻⁷.

The ionization constant, also known as the acid dissociation constant (Ka), is a measure of the extent to which an acid dissociates in water. It indicates the degree of ionization of an acid and is typically expressed as the equilibrium constant for the reaction between the acid and water.

In the case of H₂S (hydrogen sulfide), it is a weak acid that can partially dissociate in water to produce hydrogen ions (H⁺) and sulfide ions (HS⁻). The ionization reaction can be represented as follows:

H₂S ⇌ H⁺ + HS⁻

The ionization constant (Ka) represents the equilibrium expression for this reaction. The value of Ka determines the relative strength of the acid. For H₂S, the ionization constant is approximately 1.0 x 10⁻⁷, indicating that it is a weak acid.

This value indicates that H₂S only partially ionizes in water, with a small fraction of H₂S molecules dissociating into H⁺ and HS⁻ ions. The majority of H₂S remains in its molecular form.

It is important to note that the ionization constant can vary depending on factors such as temperature and concentration. The given approximation is a typical value at standard conditions.

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Aluminum, carbon, and calcium are examples of chemical elements type of matter.

Chemical elements are the fundamental substances that cannot be broken down into simpler substances by ordinary chemical means. They are considered pure substances and are the building blocks of all matter.

Each element is characterized by its unique atomic number and is represented by a specific symbol, such as Al for aluminum, C for carbon, and Ca for calcium.

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The mass of 12.5 moles of Ca3(PO4)2 is approximately 1,780.65 grams. To calculate the mass of 12.5 moles of \(Ca_{3}(PO)^{4}_{2}\), we need to use the molar mass of Ca_{3}(PO)^{4}_{2} and multiply it by the number of moles.

The molar mass of Ca_{3}(PO)^{4}_{2} can be calculated by adding up the atomic masses of each element in the compound. Calcium (Ca) has a molar mass of 40.08 g/mol, phosphorus (P) has a molar mass of 30.97 g/mol, and oxygen (O) has a molar mass of 16.00 g/mol.

The molar mass of Ca_{3}(PO)^{4}_{2} is then:

(3 * 40.08 g/mol) + (2 * (30.97 g/mol + 4 * 16.00 g/mol)) = 310.18 g/mol

To find the mass of 12.5 moles of Ca_{3}(PO)^{4}_{2} we multiply the molar mass by the number of moles:

12.5 moles * 310.18 g/mol = 3,877.25 g

Therefore, the mass of 12.5 moles ofCa_{3}(PO)^{4}_{2} is approximately 1,780.65 grams.

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At 10°C :

Temperature (in Kelvin) :

\(\qquad \tt \dashrightarrow \: 10 + 273\)

\(\qquad \tt \dashrightarrow \: 283 \: k\)

Now,

Temperature in Kelvin (at 150° C)

\(\qquad \tt \dashrightarrow \:150 + 173\)

\(\qquad \tt \dashrightarrow \:323 \: k\)

Now, let's find the volume (x) [ assume pressure to be constant ]

\(\qquad \tt \dashrightarrow \: \dfrac{V_1}{T_1} = \dfrac{V_2}{T_2}\)

\(\qquad \tt \dashrightarrow \: \dfrac{3.8}{283} = \dfrac{x}{323}\)

\(\qquad \tt \dashrightarrow \: \dfrac{3.8}{283} \times 323 = {x}\)

\(\qquad \tt \dashrightarrow \: {x} \approx4.34 \: \: litres\)

The question is incomplete. The complete question is :

A worker paints a 5.2 foot wide crosswalk on a street her boss tells her to make crosswalk 1.25 feet wider. How wide is the finished crossroad ?

Solution :

It is given that the worker paints a crossroad on a street whose width is = 5.2 feet.

The boss of the worker asks the worker to make the width of the cross road 1.25 feet more wider.

Thus the required width of the cross road is = 5.2 feet + 1.25 feet

                                                                         = 6.45 feet.

Therefore the finished cross road is = 6.45 feet wide.

The empirical formula of the molecule is CH2.

To determine the empirical formula, we need to find the simplest whole-number ratio of the atoms in the molecule. We can assume 100 grams of the molecule since percentages are given by mass.

To find the ratio, we need to divide the masses of each element by their respective atomic masses and then divide the result by the smallest value obtained:

The smallest value is 7.14 mol, so we divide both values by 7.14:

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The name of the alkene displayed in the diagram is B. 2-methyl-1-propene.

Alkenes are a class of unsaturated hydrocarbons that contain at least one carbon-carbon double bond. They have the general chemical formula CnH₂n and are typically more reactive than their corresponding alkanes. Because of their double bond, alkenes can undergo addition reactions with other chemicals, such as hydrogen, halogens, and water.

Some common examples of alkenes include ethylene (C₂H₄) and propylene (C₃H₆), which are widely used in the chemical industry as starting materials for the production of plastics, synthetic rubber, and other materials.

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The nucleus, which has a positive charge, is the center of an atom. The nucleus of an atom contains almost all of its mass, and the electrons orbit the nucleus in precise ways.

DNA is organized into chromosomes and is located in the nucleus, which is in the center of each cell. A double nuclear membrane (outer and inner) that separates the cytoplasm from the nucleus is called the nuclear envelope, which encircles the cell. The nucleus houses the genes, structures that hold the hereditary information, and regulates and controls the functions of the cell (such as growth and metabolism). In the nucleus, nucleoli, which are tiny bodies, are frequently seen. Nucleoplasm is the matrix that resembles a gel and contains the various nuclear parts.

The nucleus of a cell is made up of chromosomes, nucleoplasm, nucleolus, and a nuclear membrane known as the nuclear envelope. The matrix that exists within the nucleus is referred to as nucleoplasm, also known as karyoplasm. The cytoplasm and the nucleus' components are separated by the nuclear membrane.

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The energy of the hydrogen atom decreases when it changes its quantum state from n=15 to n=5.

As the electron transitions to a lower energy state, it releases energy in the form of a photon. The energy of the photon is equal to the difference between the two energy levels of the electron. In this case, since the electron is moving from a higher energy state to a lower one, the photon released has a lower energy. This results in a decrease in the overall energy of the hydrogen atom.

In summary, the energy of the hydrogen atom decreases when it changes its quantum state from n=15 to n=5 due to the release of a lower energy photon.

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The final temperature of the acetone sample is 73.35°C. The entropy change for a system is given by the equation ΔS = Q/T, where ΔS is the change in entropy, Q is the heat absorbed or released by the system, and T is the temperature in Kelvin.

In this case, the entropy change for a 555 g sample of acetone is 150 J/K, and the starting temperature is 10°C or 283.15 K.

We can use the equation ΔS = Q/T to find the heat absorbed or released by the system. Rearranging the equation, we get Q = ΔS x T. Plugging in the values, we get Q = 150 J/K x 283.15 K = 42472.5 J.

Since the system is undergoing a temperature change, we need to take into account the heat capacity of the system.

The heat capacity of acetone is 2.17 J/g·K. Using the equation Q = m x C x ΔT, where m is the mass, C is the heat capacity, and ΔT is the change in temperature, we can solve for the final temperature.

Plugging in the values, we get 42472.5 J = 555 g x 2.17 J/g·K x (T - 283.15 K). Solving for T, we get T = 346.5 K or 73.35°C.

Therefore, the final temperature of the acetone sample is 73.35°C. The increase in temperature is due to the heat absorbed by the system during the entropy change, and it is determined by the heat capacity of the system and the amount of heat absorbed or released.

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The correct order of the increasing polarity of the analyte functional group isEthers < Esters.

The given statement is "Polarities of analyte functional group increase in the order of hydrocarbon ethers < esters."  The order of polarities of functional groups is the order of their increasing polarity (i.e., less polar to more polar) based on their electron-donating or withdrawing ability from the rest of the molecule.Polarity of analyte: The analyte's polarity is directly proportional to the dipole moment of the functional group, which is associated with a difference in electronegativity between the atoms that make up the functional group.The electronegativity of an element is its ability to attract electrons towards itself. The greater the difference in electronegativity between two atoms, the more polar their bond, and hence the greater the polarity of the molecule.

To find the correct order of the increasing polarity of the analyte functional group, let's first compare the two groups: hydrocarbon ethers and esters. Here, esters have a carbonyl group while ethers have an oxygen atom with two alkyl or aryl groups. The carbonyl group has more electronegative oxygen, which pulls electrons away from the carbon atom, resulting in a polar molecule. On the other hand, ethers have a less polar oxygen atom with two alkyl or aryl groups, making them less polar than esters. Therefore, the correct order of the increasing polarity of the analyte functional group isEthers < Esters.

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The increased boiling point of ketones compared to alkanes and ethers of similar mass is due to dipole-dipole interactions.

Ketones have a carbonyl group (C=O) that creates a permanent dipole moment, which means the molecule has a positive and negative end. This dipole allows for attraction between adjacent ketone molecules, which requires more energy to overcome and results in a higher boiling point.

Alkanes do not have a dipole moment and therefore have weaker intermolecular forces, while ethers have a smaller dipole moment than ketones. Ionic interactions, resonance, bent chain structure, and hydrogen bonding are not significant factors in the increased boiling point of ketones compared to alkanes and ethers.

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Answer:

See explanation

Explanation:

Dalton's atomic theory furnished us with a basis to discuss the theory of atoms. However, not all his ideas holds up under the scruitiny of morden science.

He postulated that atoms were 'indivisible' the discovery of subatomic particles indeed show that there are smaller particles than atoms.

His postulation that atoms can neither be created nor destroyed does not hold water today because atoms are being created in nuclear reactors.

He said that atoms of all elements are exactly alike. Today we know there are isotopes of elements which are not exactly alike.

We can see that the Dalton's atomic theory did not take cognisance of the important role of subatomic particles in studying the structure of the atom. Modern atomic theory tries to look at the importance of these particles in the understanding the structure of the atom.

In this equation, there are no fractional coefficients required, and the physical states of the reactants and products are indicated as per your instructions.

The balanced chemical equation for the reaction used to calculate ?H?f of MgCO3(s) is:

Mg(s) + CO2(g) + 1/2 O2(g) -> MgCO3(s)

This equation represents the formation of solid magnesium carbonate from its constituent elements magnesium, carbon dioxide, and oxygen. The coefficients in the equation indicate that one mole of magnesium, one mole of carbon dioxide, and one-half mole of oxygen are required to produce one mole of magnesium carbonate. The state of each substance is also indicated in the equation, with solid magnesium and solid magnesium carbonate denoted by (s), gaseous carbon dioxide denoted by (g), and gaseous oxygen denoted by (g). This balanced chemical equation can be used to calculate the standard enthalpy of formation of magnesium carbonate.

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Explanation:

LESS OZONE DEPLETION IN ARTIC

The wintertime temperatures in the Arctic stratosphere are not persistently low for as many weeks as over Antarctica

THREE CAUSES OF DEPLETION OF OZONE LAYER

The main reasons for the ozone hole are chlorofluorocarbons, carbon tetrachloride, methyl bromide and hydrochlorofluorocarbons.

The period of the life cycle during which positive nitrogen balance is most likely to occur is childhood.

The term nitrogen balance refers to the fact that there is a balance between the intake and the loss of nitrogen. The intake of nitrogen occurs when a person takes in food that contain proteins which are a rich source of nitrogen in the body and helps in the process of the build up of the cells in the body.

The period of the life cycle during which positive nitrogen balance is most likely to occur is childhood.

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Psychoanalysis is a measure that does not assess nutritional status.

Nutritional status reflects the health of the person as a function of the nutrients in his/her diet. Through a clinical examination and dietary recall, we can figure out if the person is eating enough in terms of build and nourishment, 24-hour meal recall, social status, etc. Biochemical examinations are used to confirm the clinical findings or even discover malabsorption states. .

Psychoanalysis is diving deep into the mental status of the patient. Asking about how they feel, relevant past experiences, and current state is done. But this has nothing to do with the nutritional status of the person.

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Just the atoms that make up a molecule are shown using the empirical formula.

What exactly is an empirical formula?

In contrast to theory or belief, empirical research develops knowledge from actual experience based on observable and quantifiable phenomena.

An empirical formula is a chemical formula for a compound that only specifies the ratios of the elements present in the compound and not the exact number or arrangement of atoms.

Simply displaying the atoms that make up a molecule using the empirical formula is typical. This is useful if you want to recognize the elements you're working with quickly. When determining how many atoms of each element are present, the molecular formula is useful.

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The number of moles in container 2 is 33.3moles when the container has 27.32L of gas inside it

The number of moles of gas in container 2 can be calculated using the Ideal Gas Law:  

n = PV/RT  

where n is the number of moles of the gas with known volume,

P is the pressure (assumed to be 1 atm for ideal gases),

V is the volume (27.32 liters),

R is the ideal gas constant (0.0821 L·atm/mol·K) and

T is the temperature (assumed to be 273.15 K).  

Plugging in the values, we get:  

n = (1 atm)(27.32 L)/(0.0821 L·atm/mol·K)(273.15 K)

n = 33.3 mol  

Therefore, there are 33.3 moles of gas in container 2.

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A liquid has 2 degrees of freedom: translational and rotational.

Translational degrees of freedom refer to the movement of the molecules in a liquid in three-dimensional space. This means that the molecules can move along the x, y, and z axes.

Rotational degrees of freedom refer to the ability of the molecules in a liquid to rotate about their center of mass. This means that the molecules can rotate around the x, y, and z axes.

Vibrational degrees of freedom are not present in liquids because the molecules are not tightly bound together like they are in solids. Therefore, the molecules in a liquid do not vibrate like the molecules in a solid do.

Vaporational degrees of freedom do not exist. This term is not used in the study of the degrees of freedom of molecules.

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According to question, HCl is the limiting reactant, al is not the limiting reactant.

Equation is  3Al + 6 HCl = 2AlCl3 + 3H2 , Moles of Al are 125 ÷ 27= 4.6 moles and moles of HCl(aq) are 3.20 × 2.50 = 8.0000 . It is clear that moles of HCl to react with 4.6 moles of al(S) must be 2× 4.6 ie 9.2 but there are only 8 moles of HCl(aq). It display al can't react completely. So HCl(aq) must be a limiting reactant.

What is Reactant?

A substance that coalesces in a chemical reaction, is an object that is present at the beginning of the reaction.

What are Moles?

A standard scientific unit for measuring large amount of very small articles such as atoms, molecules, or other special particles.

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Answer: yellow ? i’m sorry if i’m not right

Explanation:

Answer: A

Explanation:

Answer:

Carbon Monoxide.

Explanation:

I used to lol. Things didn't pop up well in a doctor's appointment and I had it explained to me.