Consider at atom, such as 226 Ra, initially at rest. It undergoes alpha particle decay. Part a Which particle (the daughter atom of the alpha particle) has more momentum after the decay? Select the co

The  Which chemical is in excess and which is limiting reactant The balanced chemical reacation are the mainly

Ca(OH)2(aq)+2HCl(aq)→CaCl2(aq)+2H2O(1)

Number of moles of Ca(OH)2 = 2.0 mol

Number of moles of HCl = 2.0 mol

Using the balanced chemical equation1 mole of Ca(OH)2 reacts with 2 moles of HCl.

to react with 2.0 mol of Ca(OH)2,

we need 4.0 mol of HCl.Number of moles of HCl given = 2.0 mol

Since the number of moles of HCl given is less than what is required, it is the limiting reactant. And Ca(OH)2 is in excess What is the excess in grams To find the excess, we first need to find how much of Ca(OH)2 has reacted.

The balanced chemical equation shows that 1 mole of Ca(OH)2 produces 2 moles of H2O.

Therefore, 2.0 mol of Ca(OH)2 would produce 4.0 mol of H2O.Number of moles of H2O produced theoretically = 4.0 mol

The molecular weight of H2O is 18 g/mol.

The balanced chemical equation are the reaction

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Answer:

C. To work on the mechanics of a pitchers throw
or... A. To design a stadium with the maximum number of seats

Explanation:

1. Al₂O₃ is ionic.

2. SnO₂ is molecular.

3. CO₂ is molecular.

4. H₂O is molecular.

5. Fe₂O₃ is ionic.

6. Li₂O is ionic

The following oxides is ionic or molecular:

1. Al₂O₃ (aluminum oxide) is ionic because it is formed by a metal (Al) and a non-metal (O).

2. SnO₂ (tin oxide) is molecular, as it consists of a metal (Sn) and a non-metal (O).

3. CO₂ (carbon dioxide) is molecular since it is composed of two non-metals (C and O).

4. H₂O (water) is molecular as it is formed by two non-metals (H and O).

5. Fe₂O₃ (iron oxide) is ionic because it contains a metal (Fe) and a non-metal (O).

6. Li₂O (lithium oxide) is ionic as it is composed of a metal (Li) and a non-metal (O).

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Answer:

Q = -4903.14 j

Explanation:

Given data:

Mass of water = 23 g

Initial temperature = 78°C

Final temperature = 27°C

Heat lost = ?

Solution:

Specific heat capacity of water is 4.18 J/g.°C

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT =  27°C - 78°C

ΔT = -51°C

Q = 23 g × 4.18 J/g.°C  × -51°C

Q = -4903.14 j (negative sign shows heat is released)

Answer:a

Explanation:

Explanation:

Oxidation Numbers. It is often useful to follow chemical reactions by looking at changes in the oxidation numbers of the atoms in each compound during the reaction. Oxidation numbers also play an important role in the systematic nomenclature of chemical compounds.

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The -OH on the end of the pentanol molecule will affect the surface tension as it will be higher as that of as pentane or hexane.

This is referred to as the tension of the surface film of a liquid caused by the attraction of the particles in the surface layer by the bulk of the liquid.

It minimizes the surface area and the higher strength of the intermolecular force is present in the pentanol therefore the surface tension of the pentanol is more than surface tension of the pentane and hexane.

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Answer:

Neutrons,Electrons and Protons I think.

Explanation:

The principle used in the preparation of these salts is to dissolve

the cystine in an alcoholic alkali solution to which just sufficient

water to effect solution has been added, and, after filtering from

excess cystine, to precipitate the salt by addition of a suitable

indifferent solvent. While various solvents, such as acetone,

ether, or large amounts of alcohol caused precipitations, these were

either oily or amorphous. Only acetonitrile was found to possess

the power of initiating regular crystallization in the salt solutions.

While the solutions of the different salts require different amounts

of the solvent for complete precipitation, a partial substitution of

absolute ether for acetonitrile was found expedient in the case

of the most soluble of the salts, the K salt.

Answer:

It is simply a process of forming crystal.

Explanation:            When salt is heated and dissolve in the liquid mainly water then its called saturated solution. When we further add salt and increase heat in order to dissolve it then it forcibly dissolve in liquid it's called supersaturated solution. After we slowly cool down the temperature then the salt we have put in supersaturated solution arises in the form of crystal. Hence its called crystalization.

Using drop-down menu , IUPAC name is as follows :

cis-3-decene: (Z)-3-decene  , cis-3-nonenetriene: (Z,Z,Z)-3-nonenetriene

trans-3-decene: (E)-3-decene , trans-3-nonene: (E)-3-nonene

cis-3-decene is an alkene with a double bond between carbon atoms 3 and 4, and both alkyl groups (attached to the double bond) on the same side of the double bond. Therefore, its IUPAC name is (Z)-3-decene.

cis-3-nonenetriene is a triene with three double bonds. The double bonds are between carbon atoms 3 and 4, 6 and 7, and 9 and 10. Since all the alkyl groups attached to the double bonds are on the same side of the double bonds, the compound is named as (Z,Z,Z)-3-nonenetriene. trans-3-decene is an alkene with a double bond between carbon atoms 3 and 4, and both alkyl groups (attached to the double bond) on opposite sides of the double bond. Therefore, its IUPAC name is (E)-3-decene. trans-3-nonene is an alkene with a double bond between carbon atoms 3 and 4, and both alkyl groups (attached to the double bond) on opposite sides of the double bond. Therefore, its IUPAC name is (E)-3-nonene.

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The thing that will happen if the mechanisms for communication of ideas and discussion of science production did not exist is that researches will be harder to make.

The transmission of information is commonly defined as communication. The term can also refer to the message itself or to the field of study that investigates such transmissions.

Because the active role of all participants in this process is recognized, the term "science communication" is now more commonly used than "popularization." Making science more accessible to the general public can help to alleviate society's current confusion and instill hope for the future.

Effective communication is critical to addressing the diversity and inclusion issues that plague science. Without effective communication, gatekeeping will persist, and barriers to understanding science will remain.

Aside from benefiting society as a whole, communicating outside the scientific community can help a researcher's career by increasing the impact of their latest findings, fostering new collaborations across sectors, raising their public profile, and opening doors to unexpected opportunities

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The antimicrobial activity of chlorine is due to the formation of hypochlorous acid (option a).

The correct answer is a. The antimicrobial activity of chlorine is due to the formation of hypochlorous acid. When chlorine is added to water, it reacts with water molecules to form hypochlorous acid (HOCl) and hypochlorite ions (OCl-). HOCl is a powerful disinfectant and is responsible for the antimicrobial activity of chlorine. It can penetrate bacterial cell walls and disrupt cell membranes, leading to the destruction of bacteria and other microorganisms.

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The temperature change that indicates an increase in the average kinetic energy of the molecules in a sample is 255 K to 0°C.

Chemical reactions occur when particles of reactants react or collide with one another, hence, when particles collide faster, reaction also occurs faster.

One of the ways to make reactions occur faster i.e. increasing the average kinetic energy is by increasing the temperature.

The example that depicts an increase in temperature is 255K to 0°C, which is equivalent to 255K to 273K.

Therefore, the temperature change that indicates an increase in the average kinetic energy of the molecules in a sample is 255 K to 0°C.

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The dependent variable in the experiment  is the ice and water.

The independent variable is amount of water or ice added.

The dependent variable in any experiment is the variable that is being measured or tested in an experiment.

An experiment can be described as a procedure carried out under controlled conditions in order to discover an unknown effect or law, to test or establish a hypothesis, or to illustrate a known law.

An independent variable in an experiment is described as a variable that stands alone and is not changed by the other variables you are trying to measure.

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Answer:

1.An atom is the smallest constituent unit of ordinary matter that constitutes a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small; typical sizes are around 100 picometers ( 1 × 10−10 m, a ten-millionth of a millimeter, or 1/254,000,000 of an inch).

3.New elements aren't exactly discovered anymore. However, they can be made, using particle accelerators and nuclear reactions. A new element is made by adding a proton (or more than one) to a pre-existing element. This can be done by smashing protons into atoms or by colliding atoms with each other.

4.If an atom gains an electron, it becomes negatively charged.

If an atom loses an electron, it becomes positively charged.

Answer:

The digestive system is very important to animal health. Without the digestive system earth might still be lifeless other than bacteria and what not. The digestive system is a system to keep us full and energized. It allows us to chew and swallow our food and let it break down in our belly acid. Then it departs our body through the large, small intestines to then be flushed out to sea.

~ LadyBrain

Explanation:

an organ that is part of the

digestive system his digestive system is extremely simple

Answer:

homogeneous mixture

Explanation:

A homogeneous mixture and Solution are the physical blend of two or more substances with uniform composition. Thus, options A and C are true.

“Mixture is an act of combining two or more chemical substances that are not chemically linked.”

Types of mixtures –

There are two main types of mixture.

Homogeneous Mixture –

A Homogeneous Mixture is a mixture in which composition is uniform throughout the mixture, and it appears like a single substance.

Example – Air is a homogeneous mixture of gas etc.

Heterogeneous mixture –

A Heterogeneous mixture is a mixture in which composition is not uniform throughout the mixture.

Example – Vegetable soup is a heterogeneous mixture etc.

Solution –

A Solution is a homogeneous mixture of two or more solutes dissolved in a solvent.

Example – Solution of sugar in water etc.

Thus, a homogeneous mixture and solution are the physical blends of two or more substances with uniform composition. Thus, options A and C are true.

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The mean molecular mass of fully ionized hydrogen and helium is significantly lower than the average molecular mass of other neutral gases due to the absence of electrons in their atomic structure.

The mean molecular mass refers to the average mass of the molecules present in a gas sample. In the case of fully ionized hydrogen and helium, all the electrons have been stripped away, leaving only the bare atomic nuclei. Since the atomic nuclei of hydrogen and helium are very light compared to the electrons, their contribution to the mean molecular mass is negligible.

Hydrogen, in its neutral state, consists of one proton and one electron, with a molecular mass of approximately 1 atomic mass unit (AMU). However, when fully ionized, hydrogen loses its electron, resulting in a molecular mass of just 1 amu, solely contributed by the proton.

Similarly, helium, in its neutral state, has two protons, two neutrons, and two electrons, with a molecular mass of approximately 4 amu. But when fully ionized, helium loses both electrons, reducing its molecular mass to 4 amu, solely contributed by the protons and neutrons.

Therefore, the mean molecular mass of fully ionized hydrogen and helium is extremely low, only accounting for the mass of the protons and neutrons, while the electrons' contribution is disregarded.

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CuBr(s) is insoluble in water. Therefore, we should write the equation for the dissolution of CuBr(s) in the presence of ammonia (NH3) .CuBr(s) ⇌ Cu+(aq) + Br−(aq)For this equilibrium reaction, we can write an equilibrium constant expression as follows:

Ksp = [Cu+][Br−]Where Ksp is the solubility product constant. Let the solubility of CuBr be x.Since the dissolution reaction involves Cu+(aq), we can use the Cu+ and NH3 reaction to relate the concentration of Cu+ with the concentration of NH3. We have the following reaction:Cu+(aq) + 2NH3(aq) ⇌ Cu(NH3)2+(aq) Kf = 6.3 × 10^10Let the concentration of NH3 be [NH3]. Then, the concentration of Cu(NH3)2+ is:[Cu(NH3)2+] = Kf[Cu+][NH3]^2= (6.3 × 10^10)(x)[NH3]^2The concentration of Cu+ is the same as the concentration of Br−: [Cu+] = [Br−]Let [Cu+] = x. Therefore, [Br−] = x.Ksp = [Cu+][Br−]Ksp = x2Therefore, the concentration of Cu(NH3)2+ in terms of Ksp is:[Cu(NH3)2+] = (Kf / Ksp)1/3 = (6.3 × 10^10 / 6.3 × 10^−9)1/3= 100The concentration of Cu+ (and Br−) is therefore 100 mol dm−3. Using the equation above, the solubility of CuBr(s) in 0.59 m NH3 is calculated to be:x = 100 × 2[NH3]^2 = 100 × 2 × (0.59)^2 = 69.6 g dm−3 (or 69.6 g L−1)Therefore, the solubility of CuBr(s) in 0.59 m NH3 is 69.6 g L−1.

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Answer:

Shrimp

Explanation:

The shrimp only eat diatoms and dinoflagellates who get their energy from the sun, making them producers

Shrimp are still considered primary consumers even though they eat phytoplankton, which are a producer rather than a plant. This is because phytoplankton gets energy from the sun, not plants. You can read more in producers but this is primary consumers.

Answer:14. Aluminum fluoride

Explanation:yw

No, an individual atom cannot be resolved using a conventional electron microscope. The resolution of an electron microscope is ultimately limited by the wavelength of the electrons used.

While electron microscopes can achieve impressive resolution, down to the sub-nanometer scale, they still fall short of being able to directly visualize individual atoms.

The wavelength of electrons is inversely proportional to their momentum, and to achieve shorter wavelengths, higher accelerating voltages are required. However, even with high accelerating voltages, the de Broglie wavelength of electrons at typical energies used in electron microscopes is still on the order of picometers (10^-12 meters). This is comparable to the spacing between atoms in solid materials.

To directly resolve individual atoms, a technique called aberration-corrected electron microscopy can be employed, which compensates for the aberrations in the electron beam to achieve sub-angstrom resolution. However, even with this advanced technique, directly visualizing individual atoms remains challenging and is not routinely achieved.

Alternatively, other techniques such as scanning probe microscopy, such as atomic force microscopy (AFM) or scanning tunneling microscopy (STM), are better suited for imaging individual atoms and atomic structures. These techniques utilize a probe tip to interact with the sample surface and can achieve atomic resolution.

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The law of conservation of mass states that matter cannot be created or destroyed, only transformed from one form to another. This means that the total mass of the reactants in a chemical reaction must equal the total mass of the products.

One way to demonstrate the law of conservation of mass is to conduct a simple chemical reaction in which a solid reactant is transformed into a gas product. For example, you can heat a piece of zinc metal in a test tube and observe the production of zinc oxide gas.

To set up the activity, you will need:

A piece of zinc metal

A test tube

A test tube holder

A bunsen burner

A tripod and wire gauze

Here's how to conduct the activity:

Set up the bunsen burner and place the test tube holder on the tripod.

Place the piece of zinc metal in the test tube.

Place the test tube in the test tube holder.

Light the bunsen burner and adjust the flame so that it is not too hot.

Hold the test tube over the flame until the zinc metal begins to react and produce gas.

Observe the gas being produced and note any changes in the appearance of the zinc metal.

As the zinc metal reacts with the oxygen in the air, it will produce zinc oxide gas. You should see the mass of the zinc metal decrease as it is transformed into gas. However, the total mass of the reactants (zinc metal and oxygen) will be equal to the total mass of the products (zinc oxide gas).

This activity demonstrates the law of conservation of mass, as the total mass of the reactants and products remains constant.

The third law of thermodynamics describes the entropy of a: solid.

The third law of thermodynamics states that the entropy of a pure crystalline substance approaches zero as the temperature approaches absolute zero (0 Kelvin or -273.15 degrees Celsius). This law implies that at absolute zero, a perfectly ordered and pure crystalline solid will have zero entropy.

The third law of thermodynamics is not specific to liquids or gases but applies to solids. In a solid, the molecules are highly ordered and have fixed positions in a regular lattice structure. As the temperature decreases towards absolute zero, the thermal motion of the molecules reduces, and the system becomes more ordered, resulting in a decrease in entropy.

In contrast, liquids and gases have higher entropy compared to solids at absolute zero because their molecules have more freedom of movement and are not as tightly arranged. Therefore, the third law of thermodynamics specifically addresses the entropy of solids and does not apply to liquids or gases.

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Simple Cubic (SC): 1 atom, nearest-neighbor distance = a/2

Body-Centered Cubic (BCC): 2 atoms, nearest-neighbor distance = a

Face-Centered Cubic (FCC): 4 atoms, nearest-neighbor distance = a√2

In a crystal lattice, the number of atoms found inside a unit cell and the distance between nearest-neighbor atoms vary depending on the type of lattice structure. Let's explore the characteristics of each type of cubic crystal lattice:

Simple Cubic (SC)

Number of atoms in a unit cell: 1

Nearest-neighbor distance: The nearest-neighbor atoms are located at the corners of the cube. The distance between the center of the cube (where the atom is located) and the corner atoms is equal to half of the length of one side of the cube.

Nearest-neighbor distance = a/2

Body-Centered Cubic (BCC)

Number of atoms in a unit cell: 2

Nearest-neighbor distance: The nearest-neighbor atoms are located at the corners of the cube and one atom at the center of the cube. The distance between the center atom and the corner atoms is equal to the length of one side of the cube.

Nearest-neighbor distance = a

Face-Centered Cubic (FCC)

Number of atoms in a unit cell: 4

Nearest-neighbor distance: The nearest-neighbor atoms are located at the corners of the cube and one atom at the center of each face of the cube. The distance between the center atom of one unit cell and the corner atom of a neighboring unit cell (center to center) is equal to the length of one side of the cube multiplied by the face diagonal of a cube (√2).

Nearest-neighbor distance = a√2

It's important to note that the "a" in the above equations represents the lattice constant, which is the length of one side of the unit cell.

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Polar molecules exhibit dipole-dipole forces -

Dispersion Forces -

Dispersion Forces also known as London Dispersion Forces are weak interactions formed from the temporary dipole that arises from the change in electron density in a molecule.

Is dipole-dipole a dispersion force?

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Answer:

Makes converting easier

Explanation:

Answer:

es la primera niña tonta y fea

Answer:

Silicone

Explanation:

According to periodic trends, electron affinity increases as you go right and decreases as you go down. Silicone is above arsenic so I would expect it to have a higher electron affinity.