The correct answer is gravity and pressure.
Hydrostatic equilibrium in our Sun is the balance between gravity and pressure.
In the Sun, the inward gravitational force is counteracted by the outward pressure force generated by the high temperature and density of the stellar material. The gravitational force tries to collapse the Sun under its own weight, while the pressure force resists this collapse. The two forces reach a state of equilibrium where the gravitational force pulling inward is balanced by the pressure force pushing outward.
The energy produced in the Sun's core by nuclear fusion creates a high temperature and pressure, which leads to the emission of radiation. This radiation, in the form of photons, exerts an outward pressure that contributes to the overall pressure force.
While ionization and convection play important roles in the dynamics and energy transport within the Sun, they are not the primary factors involved in maintaining hydrostatic equilibrium. Ionization refers to the process of atoms losing or gaining electrons, and it affects the Sun's opacity and energy transport. Convection is the process of material rising and sinking due to temperature differences and is responsible for energy transport from the core to the surface. However, neither ionization nor convection directly balance gravity in hydrostatic equilibrium.
Therefore, the correct answer is gravity and pressure.
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aqueous hydrobromic acid reacts with solid sodium hydroxide to produce aqueous sodium bromide and liquid water . what is the theoretical yield of sodium bromide formed from the reaction of of hydrobromic acid and of sodium hydroxide?
The theoretical yield of sodium bromide is 82.21 g.
Theoretical yield :
Sodium bromide formed from the reaction of 64.7g of hydrobromic acid and 53.4g of sodium hydroxide.
molecular weight of hydrobromic acid ( HBr ) = 80.9119 g/mol
molecular weight of Sodium bromide ( NaBr) = 102.894 g/mol
Now,
If 80.9 g of hydrobromic acid form 102.8 g of sodium bromide
∴ 64.7 g of hydrobromic acid form ( ? ) g of sodium bromide
= (64.7 × 102.8) / 80.9
= 82.21 g of sodium bromide
So, 82.21 g of Sodium bromide formed from the reaction of 64.7g of hydrobromic acid and 53.4g of sodium hydroxide.
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how many valence electrons does gallium (ga, atomic no. = 31) have?
Gallium (Ga, atomic number = 31) has 3 valence electrons, as indicated by the 4s² 4p¹ configuration. Valence electrons are the electrons located in the outermost energy level or shell of an atom, and they play a crucial role in determining the chemical properties and reactivity of an element.
Gallium's electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p¹. Valence electrons are the electrons in the outermost energy level, which in this case is the 4th energy level (4s² 4p¹).
Having three valence electrons, gallium (Ga) belongs to group 13. Therefore, the complete amount of electrons in the 4s and 4p subshells three in all can be lost in a chemical process.
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What part of the atom can be used to figure out the name of the element
Answer:
number of protons
Explanation:
The number of protons determines an element's atomic number and is used to distinguish one element from another.
molar mass of the metal oxide is 231.74 g times mol what is the molar mas of the chloride of this mass
The molar mass of the chloride of the metal oxide M2O is 119.5 g/mol..
The molar mass of a substance is the mass of one mole of the substance, which is equal to the sum of the atomic masses of all the atoms it is composed of. To calculate the molar mass of the chloride of the metal oxide M2O, we need to determine the formula of the chloride first.
The charge on M2O is 2+, meaning that it is composed of two M+ ions and one O2- ion. The chloride ion has a charge of -1, so to balance out the charges, we need two Cl- ions. This means that the formula of the chloride of M2O is M2Cl2.
The molar mass of M2Cl2 can be calculated by adding the atomic masses of each atom present. The atomic mass of M is 24.30 g/mol, and the atomic mass of Cl is 35.45 g/mol. Thus, the molar mass of M2Cl2 is 2(24.30) + 2(35.45) = 48.60+ 70.90=119.5 g/mol.
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2. What is the molar mass of PCls?
Temperature _____ to an object’s thermal energy, but it is not the only factor.
a
resists
b
contributes
c
stops
d
moves
Answer:
it would be resists
Explanation:
since its not the only factor (correct me if im wrong)
Calculate the number of moles of gas used when 7.5 moles of sodium react with oxygen.
The number of moles of gas(Oxygen) used when 7.5 moles of sodium react with oxygen is 1.875 moles.
Now, The balanced chemical equation for the reaction of sodium and oxygen can be written as:
4Na(s)+O₂(g)→2Na₂O(s)
From the above-balanced equation, it means that when 4 moles of Na react with 1 mole of O₂ it produces 2 moles of Na₂O.
Therefore, according to the stoichiometry of the balanced chemical equation:
when 7.5 moles of sodium react with oxygen the number of moles of O₂ can be calculated as:
4 moles of Na react with 1-mole O₂
Therefore, 7.5 moles react with 7.5/4 =1.875 mol of oxygen to form Na₂O.
Hence, 1.875 moles of oxygen will react with 7.5 moles of sodium.
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50 POINTS
a 6.7g piece of rock boiled to 100.0 degrees celsius is placed in 100.0 mL of water with an initial temperature of 23 degrees celsius. the equilibrium temperature when the rock is added is 45 degrees celsius. what is the specific heat of the rock?
Answer:
To calculate the specific heat of the rock, you can use the formula for heat transfer: Q = mcΔT, where Q is the heat transferred, m is the mass of the substance, c is the specific heat capacity and ΔT is the change in temperature.
In this case, we can assume that the heat lost by the rock is equal to the heat gained by the water. Therefore:
Q(rock) = Q(water)
m(rock)c(rock)(T(final) - T(initial, rock)) = m(water)c(water)(T(final) - T(initial, water))
where m(rock) = 6.7 g, T(initial, rock) = 100.0°C, T(final) = 45°C, m(water) = 100.0 g (assuming the density of water is 1 g/mL), c(water) = 4.18 J/g°C (specific heat capacity of water), and T(initial, water) = 23°C.
Substituting these values into the equation above and solving for c(rock), we get:
c(rock) = (m(water)c(water)(T(final) - T(initial, water))) / (m(rock)(T(final) - T(initial, rock)))
c(rock) = (100.0 g * 4.18 J/g°C * (45°C - 23°C)) / (6.7 g * (45°C - 100.0°C))
c(rock) ≈ 1.26 J/g°C
So the specific heat of the rock is approximately 1.26 J/g°C.
the image above depicts your favorite element above. which of the following correctly identifies the sign of s and identifies the correct process?
I can give you some general information about the sign of s and the process of identifying it in an element. To identify the sign of s in an element, you need to determine its electron configuration and look at the electrons in the first shell.
The s wave function has no angular dependence and can be described by the principal quantum number
The sign of s refers to the wave function associated with the first electron shell of an atom. This wave function determines the probability of finding an electron in a particular location around the nucleus.
The process of identifying the sign of s involves looking at the electron configuration of the element and determining which electrons occupy the first shell. If there are two electrons in the first shell, then they both have the same sign of s. If there is only one electron in the first shell, then its sign of s can be either positive or negative, depending on the direction of its spin.
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Aristonun teorisini çürüten bilim adamı
3. A screwdriver has the density of 6.8 grams per cubic centimeter (g/cm³). It also has the mass of 5.3
grams (g). What is the screwdrivers volume?
Density is defined as mass of the given matter divided by its volume
it's SI unit is kg/m³
given, density = 6.8 grams per cubic centimeter (g/cm³)
mass = 5.3 grams (g).
D = M ÷ V
V = M ÷ D
V = 5.3 ÷ 6.8
V = 0.77941 g/cm³
density is a physical property.helium is less dense than air while carbon dioxide is more dense than airWhen we heat up an object normally we observe that , they increase in volume, and their density decreases.Temperature greatly affects volume. As temperature increases, the volume of most solids and gases increases which directly impacts densityTo know more about density visit :
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nitric acid (hno3) is used in the production of fertilizer, dyes, drugs, and explosives. calculate the ph of a hno3 solution having a hydrogen ion concentration of 0.65 m. report your answer to the second decimal place.
A solution of HNO₃ with a hydrogen ion content of 0.65 M has a pH of 0.19.
Nitric acid (HNO₃) is a useful chemical that is employed in the production of fertilisers, dyes, drugs, and explosives. This acid's pH is required to calculate. A pH of less than 7 is acidic. Nitric acid's hydrogen ion concentration of 0.65 M has to be used to calculate the pH. The formula for the calculation of pH is given below:
pH = -log[H⁺] [H⁺] is equal to 0.65 M
pH can be computed using this formula:
pH = -log[H⁺]
pH = -log[0.65]
pH = 0.187
pH=0.19
Hence, the pH of a HNO₃ solution having a hydrogen ion concentration of 0.65 M is 0.19.
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What is the reactive intermediate in the reaction of 1,3-diene with hbr, resulting in 1,4-addition?
Allylic carbocation is the reactive intermediate in the reaction of 1,3-diene with hbr, resulting in 1,4-addition.
Are allylic carbocations more stable than tertiary?While stabilized primary resonance carbocations are less stable than tertiary carbocations( allyl cation, benzyl cation, and methoxymethyl cation), stabilized secondary resonance carbocations are more stable than tertiary carbocations.What's the structure of allylic?An allyl group is a substituent with the structural formula H2C = CH − CH2R, where R is the rest of the patch. It consists of a methylene ground( − CH2 −) attached to a vinyl group( − CH = CH2). The name is deduced from the Latin word for garlic, Allium sativum.Learn more about Allylic carbocation here:
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Which organelle of a prokaryotic cell contains genetic information?
cell membrane
ribosomes
nucleus
nucleoid
Answer:
The right option is the 4 one. nucleoid
Prokaryotic cells are simple cells that lack a definite nucleus and some membrane-bound organelles. Prokaryotic cells have a nucleoid region, which is an irregularly-shaped central region of the cell that contains the cell’s genetic information (DNA). Other organelles that can be found in prokaryotic cells include plasma membrane, cell wall, cytoplasm, and ribosomes.
Explanation:
Answer:
nucleoid
Explanation:
11 grams of carbon dioxide, CO2, is dissolved in 1000 mL of solution. Determine the molarity (M).
Answer: The molarity is 0.25 M
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
\(Molarity=\frac{n\times 1000}{V_s}\)
where,
n = moles of solute
\(V_s\) = volume of solution in ml
moles of \(CO_2\) = \(\frac{\text {given mass}}{\text {Molar mass}}=\frac{11g}{44g/mol}=0.25mol\)
Now put all the given values in the formula of molality, we get
\(Molarity=\frac{0.25\times 1000}{1000ml}\)
\(Molarity=0.25M\)
Therefore, the molarity is 0.25 M
Zi notices the spilled product, and comments that it looks different from the original ingredients. Carlotta explains that all substances have distinctive physical and chemical properties; for example, _____ are examples of physical properties.
Density, Melting point, Boiling point and Hardness are examples of physical properties.
What is physical properties?A physical property refers to that property which is measurable and whose value indicates a state of a physical system. Examples of physical properties are Density, Melting point, Boiling point and Hardness so we can conclude that Density, Melting point, Boiling point and Hardness are examples of physical properties.
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How many atoms in:
1. NiO -
2. CuO -
3. BaO -
(Pls help ill give brainliest!)
Answer:
I think it might be:
NiO=2
CuO=4
BaO=2
Explanation:
Hope this helps.
how would you describe the appearance of the substance after the phase change
Answer: The appearance of the substance before the phase change can be described as Melting, Vaporization, Sublimation, Condensation.
Melting:
When a substance converts from the solid to the liquid.
Vaporization:
The substance changes from a liquid to a gas.
Condensation:
When a substance converts from a gas to a liquid.
Sublimation:
When a substance converts directly from a solid to a gas without going through the liquid phase.
Therefore, the appearance of the substance before the phase change can be described as Melting, Vaporization, Sublimation, Condensation.
En condiciones normales 1g de aire ocupa un volumen de 773 mL ¿ qué volumen ocupará la misma masa de aire a 0 ºC y la presión a 93,3 KPa *
Answer:
El volumen que ocupará la misma masa de aire es 839.49 mL.
Explanation:
Las condiciones normales de presión y temperatura (abreviado CNPT) o presión y temperatura normales (abreviado PTN o TPN), son términos que implican que la temperatura referenciada es de 0ºC (273,15 K) y la presión de 1 atm (definida como 101.325 Pa).
La ley de Boyle dice que “El volumen ocupado por una determinada masa gaseosa a temperatura constante, es inversamente proporcional a la presión” y se matemáticamente como
Presión*Volumen=constante
o P*V=k
La ley de Charles es una ley que dice que cuando la cantidad de gas y de presión se mantienen constantes, el cociente que existe entre el volumen y la temperatura siempre tendrán el mismo valor:
\(\frac{V}{T} =k\)
La ley de Gay-Lussac establece que la presión de un volumen fijo de un gas, es directamente proporcional a su temperatura. Se expresa matemáticamente como:
\(\frac{P}{T} =k\)
Combinando estas tres leyes se obtiene:
\(\frac{P*V}{T} =k\)
Siendo un estado inicial 1 y un estado final 2, la expresión anterior queda determinada como:
\(\frac{P1*V1}{T1} =\frac{P2*V2}{T2}\)
En este caso:
P1= 101325 PaV1= 773 mLT1= 273.15 KP2= 93,3 kPa= 93300 PaV2= ?T2= 0°C= 273.15 KReemplazando:
\(\frac{101325 Pa*773 mL}{273,15 K} =\frac{93300 Pa*V2}{273.15 K}\)
y resolviendo obtenes:
\(V2=\frac{273.15 K}{93300 Pa} *\frac{101325 Pa*773 mL}{273,15 K}\)
V2= 839,49 mL
El volumen que ocupará la misma masa de aire es 839.49 mL.
Which of the following substituents is NOT an ortho, para director in an electrophilic aromatic substitution reaction? (A)-CI (B) 요 -NICCH (D) -OH (E) - CH (C) 요 i -CNH Answer:......
Among the given substituents, the one that is NOT an ortho, para director in an electrophilic aromatic substitution reaction is (C) 요 i -CNH.
In electrophilic aromatic substitution reactions, substituents can either be ortho/para directors or meta directors.
Ortho/para directors are substituents that increase the electron density on the aromatic ring, facilitating electrophilic attack at the ortho or para positions. On the other hand, meta directors decrease the electron density and direct substitution to the meta position.
Let's analyze each substituent:
(A) -CI: Chlorine is an ortho, para director. It is electron-withdrawing, which deactivates the ring but still directs substitution to the ortho and para positions.
(B) 요 -NICCH: The nitro group (-NO2) is a strong meta director. It withdraws electrons from the ring, making it highly deactivated and directing substitution to the meta position.
(D) -OH: The hydroxyl group (-OH) is an ortho, para director. It donates electrons through resonance, increasing the electron density on the ring and directing substitution to the ortho and para positions.
(E) - CH3: The methyl group is an ortho, para director. It donates electrons through inductive effects, increasing the electron density on the ring and directing substitution to the ortho and para positions.
(C) 요 i -CNH: The cyano group (-CN) is a strong meta director. It withdraws electrons from the ring, deactivating it and directing substitution to the meta position. The addition of an amine group (-NH) in this case does not change its meta-directing behavior.
Therefore, (C) 요 i -CNH is the substituent that is NOT an ortho, para director in an electrophilic aromatic substitution reaction.
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In an ionic compound, the size of the ions affects the internuclear distance (the distance between the centers of adjacent ions), which affects lattice energy (a measure of the attractive force holding those ions together).
Based on ion sizes, rank these compounds of their expected lattice energy.
Note: Many sources define lattice energies as negative values. Rank by magnitude and ignore the sign.
Lattice energy = absolute value of the lattice energy.
Greatest |lattice energy| (strongest bond)
least |lattice energy| (strongest bond)
MgBr_2, MgF_2, MgCl_2, MgI_2
The compounds ranked by their expected lattice energy from greatest to least are: MgF_2, MgCl_2, MgBr_2, MgI_2.
Lattice energy is a measure of the energy released when gaseous ions come together to form an ionic solid. It is influenced by factors such as ion charge and ion size. In general, as the charges of the ions increase, the lattice energy also increases. However, when comparing ions with the same charge, the size of the ions becomes the determining factor.
In the given compounds, the common ion is Mg_2+ (with a +2 charge), while the anions are F-, Cl-, Br-, and I-. Among these anions, fluoride (F-) has the smallest ionic radius, followed by chloride (Cl-), bromide (Br-), and iodide (I-). Smaller ions have a higher charge density, meaning the positive charge is concentrated in a smaller space, leading to stronger attractive forces between the ions.
Therefore, based on ion size, the compound with the greatest expected lattice energy is MgF_2, followed by MgCl_2, MgBr_2, and MgI_2, with MgF_2 having the strongest bond and MgI_2 having the weakest bond.
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calculate the number of moles of magnesium, chlorine, and oxygen atoms in 2.70 moles of magnesium perchlorate, mg(clo4)2 .
The number of moles of magnesium, chlorine, and oxygen atoms in 2.70 moles of magnesium perchlorate is 2.70, 5.40, 21.60.
The formula of the compound is Mg(ClO4)2.
From the formula, we can see that 1 molecule of Mg(ClO4)2 contains 1 atom of Mg, 2 atoms of Cl and 8 atoms of O.
So 2.70 mol Mg(ClO4)2 contains
1 * 2.70 mol Mg = 2.70 mol Mg
2 * 2.70 mol Cl = 5.40 mol Cl
8 * 2.70 mol O = 21.60 mol O
So, the required answer is 2.70, 5.40, 21.60.
Therefore, the number of moles of magnesium, chlorine, and oxygen atoms in 2.70 moles of magnesium perchlorate is 2.70, 5.40, 21.60.
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Which of the following is an example of chemical energy?
Select one:
a hot metal pan
a light bulb
a burger & fries
an empty bowl
a light bulb is the example of chemical energy
Answer:
a light bulb
Explanation:
Which is NOT a characteristic of mixture Help please
A. Elements in a mixture are combined without creating a chemical reaction
B. Each substance in a mixture retains its own chemical identity
C. A chemical change occurs within a mixture
D. Two or more elements are combined with one another
Answer:
Its C let me know if its wrong!
what may cause some short term environmental changes how would organisms respond to these changes
Answer:
Refer to explanation
Explanation:
Weather is the main cause behind most short term environmental changes
For example, a period of heavy rain may lead to a pond overflowing, and flooding the nearby shrubbery
Animals in the area would adapt to this by trying to keep away from the flooded area until it dries out, once the rain ends
Question 10 of 10
What is the name for the units of information in chromosomes?
A. Traits
B. Genes
C. Heredity
D. DNA
Please hurry
Answer:
genes
Explanation:
I passed the exam jUST trust me
Answer:
The answer is B: Genes
Explanation:
Genes is the units of information
How many moles of Mg3(PO4)2 are in 350.00 grams of Mg3(PO4)2?
Answer:
1.3 moles/ 1.33150727 moles
Explanation:
350g x 1 mol/262.86g = 1.3 moles
The molar mass of Mg3(PO4)2 is 262.855 g/mol
Atomic weight of the parts:
Mg 24.3050 x 3 = 72.92
P 30.973762 x2 = 61.95
O 15.9994 x8 = 127.995
There are 262.855 grams in one mole, so
350.00 g x (262.855g/1 mole) = 1.33 moles Mg3(PO4)2
Which of the following elements are stable?
A. Fluorine
B. Neon
C. Carbon
D. Boron
Answer:
Neon is the most stable, fluorine and carbon too are stable
Explanation:
1.- Escribe sobre la línea el nombre del grupo funcional al que pertenecen los siguientes compuestos. a.) CO2_____________ b).Na2O_______________ c). HgH____________ d.) HCl_____________ e.) Li OH______________ f.) H2sO4___________ ¿?
Answer:
Explanation:
Hola! ¿Cómo estás?
Los grupos funcionales se ocupan de la química orgánica y no de la química inorgánica. La química orgánica son los alcanos, alquenos, alquinos y otros. Lo que ha escrito allí como ejemplos no es química orgánica, sino química inorgánica. Eso hace que sea imposible encontrar su grupo funcional, ya que los elementos y compuestos inorgánicos no tienen grupos funcionales.
Yo espero que entiendes
Why does the surface of the oocyte change when the first sperm cell touches the oocyte?
To prevent more than one sperm from entering the egg.
What is oocyte?
An oocyte , or ovocyte is a female gametocyte or germ cell involved in reproduction. In other words, it is an immature ovum, or egg cell. An oocyte is produced in a female fetus in the ovary during female gametogenesis. The female germ cells produce a primordial germ cell (PGC), which then undergoes mitosis, forming oogonia. During oogenesis, the oogonia become primary oocytes. An oocyte is a form of genetic material that can be collected for cryoconservation.
When the sperm and egg fuse it triggers a release of calcium ions, which cause the cortical granules inside the egg to fuse with the plasma membrane. As they fuse, these granules release their contents outside of the cell, toward the remains of the zona pellucida.
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