As an example option C. A lizard is cold, and it moves to a sunny rock to warm up, hows an organism that cannot reach homeostasis through internal changes.
Homeostasis is the nation of steady internal, bodily, and chemical conditions maintained via dwelling systems. that is the circumstance of gold standard functioning for the organism and consists of many variables, which include body temperature and fluid balance, being kept inside certain pre-set limits.
Homeostasis is the ability to keep a quite stable internal kingdom that persists regardless of modifications within the world outside. All dwelling organisms, from flora to puppies to human beings, must alter their internal environment to procedure power and ultimately continue to exist.
Homeostasis is maintained by using a series of manipulation mechanisms performed at the organ, tissue, or cell degree. these management mechanisms include substrate supply, activation or inhibition of person enzymes and receptors, synthesis and degradation of enzymes, and compartmentalization.
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PLEASE HELP ME GUYS!! I NEED THE CORRECT ANSWER! IF YOU ARE NOT SURE, PLEASE LET SOMEONE ELSE ANSWER! IT'S ONLY FIVE POINTS!
Question: What information can the atomic emission spectra of a distant star yield for scientists?
A. chemical composition of the star
B. age of the star
C. number of electrons in the star
D. distance to the star
Answer:
A. Chemical composition of the star
Explanation:
'Each element absorbs light at specific wavelengths unique to that atom. When astronomers look at an object's spectrum, they can determine its composition based on these wavelengths' - astronomy.com
'Atomic emission spectra are unique spectra of light emitted by an element when electricity is run through it or when it is viewed through a prism. Because they are unique, they can act as an element s fingerprint' - brightstorm.com
Answer:
The science of spectroscopy is quite sophisticated. From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star. The spectral line also can tell us about any magnetic field of the star. The width of the line can tell us how fast the material is moving.
If you burn 39. 3 g of hydrogen and produce 351 g of water, how much oxygen reacte?
312 grams of oxygen reacts.
Balanced chemical equation for the reaction of hydrogen and oxygen to produce water: 2H₂ + O₂ → 2H₂O.
m(H₂) = 39.3 g; mass of hydrogen
n(H₂) = m(H₂) ÷ M(H₂).
n(H₂) = 39.3 g ÷ 2 g/mol.
n(H₂) = 19.65 mol; amount of hydrogen
m(H₂O) = 351 g; mass of water
n(H₂O) = 351 g ÷ 18 g/mol
n(H₂O) = 19.5 mol; amount of water
From chemical equation: n(O₂) : n(H₂O) = 1 : 2
n(O₂) = 19.5 ÷ 2
n(O₂) = 9.75 mol; amount of oxygen
m(O₂) = 9.75 mol × 32 g/mol
m(O₂) = 312 g; mass of oxygen
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A compound is analyzed and found to contain 92.24% carbon, 7.76% hydrogen. Calculate the
mass of the compound that contains 185.0 g of hydrogen.
The mass of the compound that contains 185.0 g of hydrogen is 2384.02 g
Data obtained from the questionThe following data were obtained from the question:
Percentage of carbon = 92.24%
Percentage of hydrogen = 7.76%
Mass of hydrogen = 185.0 g
Mass of compound =?
How to determine the mass of the compoundThe mass of the compound can be obtained as illustrated below:
Percentage of hydrogen = (mass of hydrogen / mass of compound) × 100
7.76% = 185 / mass of compound
0.0776 = 185 / mass of compound
Cross multiply
0.0776 × mass of compound = 185
Divide both sides by 0.0776
Mass of compound = 185 / 0.0776
Mass of compound = 2384.02 g
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Attractions between the negative oxygen atom of one water molecule and the positive hydrogen atom of another water molecule are called.
Attractions between the negative oxygen atom of one water molecule and the positive hydrogen atom of another water molecule is called hydrogen bond.
Water molecule is made up of one oxygen atom and one hydrogen atom. Each hydrogen atom shares an electron pair with the oxygen atom. The water molecule also contains two unshared lone pairs of electrons.
The lone pair of electrons repel each other and also repel the hydrogen atoms. This gives the water molecule a bent shape, with a hydrogen atom at each of the two corners and the unshared pairs of electrons at the other two corners. The angle between the hydrogen atoms is 104.5 degrees.
This unequal sharing of electron causes the oxygen atom to have a partial negative charge and the hydrogen atom to have a partial positive charge, causing electrostatic attractions between the hydrogen atom of one water molecule and the oxygen atom of another hydrogen atom. This attraction is called hydrogen bond.
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1. what mass of solid cocl2 would you need, to prepare 250 ml of 0.150 m solution of cocl2 from solid cocl2 and distilled water? show your calculations.
The quantity of matter in an item is its mass. Scientists frequently use balances to quantify mass. Using an electronic balance or a beam balance, one may directly determine the mass of solids.
What is meant by mass of solid?
The quantity of matter in an item is its mass. Scientists frequently use balances to quantify mass. Using an electronic balance or a beam balance, one may directly determine the mass of solids. A liquid's mass can be calculated by measuring its volume and using the density table to determine the liquid's density.
The kilograms is the SI unit of mass (Kg). To get an object's mass, divide its weight by the acceleration of gravity. The weight units must be changed to Newtons. For instance, 1 kg equals 9.807 N. If you want to know an object's mass on Earth, divide its weight in Newtons by the Earth's gravitational acceleration, which is 9.8 meters per second2.
Here, solute is solid cocl2 and our solvent is distilled water.
The volume of solute is generally ignored, so we would dissolve,
[tex]$250 \mathrm{~mL} \cdot \frac{\mathrm{L}}{10^3 \mathrm{~mL}} \cdot 0.150 \mathrm{M} \cdot \frac{129.9 \mathrm{~g}}{\mathrm{~mol}} \approx 5.68 \mathrm{~g}$[/tex]
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The density of acetone is 0.702 g/ml. how much in grams does 9.85 x 10 -2 l mass? (report answer in 4 sf).
Mass of acetone is 69.147 grams.
V(acetone - C₃H₆O) = 9.85 × 10⁻² l
V(acetone) = 0.0985 l
V(acetone) = 98.5 ml; volume of acetone
d(acetone) = 0.702 g/mL; density of acetone
m(acetone) = V(acetone) × d(acetone).
m(acetone) = 98.5 ml × 0.702 g/ml.
m(acetone) = 69.147 g; mass of acetone
Acetone or propanone is the colorless, volatile, flammable organic compound (ketone).
Density is the mass of an object divided by its volume. The SI derived unit for density is the kilogram/cubic meter, but chemist usually use gram per milimeter.
Mass is a fundamental measure of the amount of matter in the object.
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Uring oxidative phorphorylation, atp is produced as hydrogen ions move from across the innermembrane from the ________ to ___________
During oxidative phosphorylation, ATP is produced as hydrogen ions move from across the innermembrane from the matrix to intermembrane space.
Oxidative phosphorylation is the process in which adenosine triphosphate (ATP) is synthesed.
It is generating 36 ATP molecules per one molecule of glucose.
This process consume oxygen and it is coupled to the movement of electrons through the mitochondrial electron transport chain.
Movement of hydrogen ions makes proton concentration gradient between the intermembrane space and the matrix, which is used for production of ATP (see the picture below).
There are four protein complexes in the innermembrane involved in transport of protons and electrons.
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Sarah measures out 151 grams of SO2. How many moles is this? Express your answer to three significant figures.
151 grams of SO2 is equal to
moles.
Answer:
151 g SO₂ × [1 mol SO₂/64.06 g SO₂] = 2.36 mol SO₂
Explanation:
Answer:
2.36
Explanation:
got ir right on plato
The half-life of strontium-90 is 28 years. how long will it take a 100-mg sample to decay to a mass of 56 mg? (round your answer to the nearest whole number.)
The half-life of strontium-90 is 28 years. It will take 52 years a 100-mg sample to decay to a mass of 56 mg.
What is half life period?A half-life is just the amount of time it takes for something to go from 100% to 50%. The phrase is most frequently used in reference to radioactive decay, which happens when energetic atomic particles that are unstable lose momentum. There are 29 elements that have been shown to be susceptible to going through this process.Number of half lives that have passed is n, and the fraction that is left is equal to 0.5n.
Given that one half life is equal to 28 years, we must find n in this situation, and the remainder will be equal to 16/56, or 0.28.
0.28 = 0.52^n n = 2
after 1 half life = 0.52 remains.
after 2 half lives= 0.28 remains
Therefore, one half life is 28 years, it will take two half lives for 56 mg to decompose into 16 mg, which is equal to 52 years.
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explain the energy and intermolecular forces that are involved for liquid solid and gas
The energy and intermolecular forces involved for liquid solid and gas are as follows:
Solids: solids have strong intermolecular forces and low kinetic energy.Liquids: liquids have weak intermolecular forces and high kinetic energy.Gases: gases have negligible intermolecular forces and very high kinetic energy.What are intermolecular forces?Intermolecular forces are forces of attraction that exists between the molecules of a substance.
The strength of the intermolecular forces and hence, the kinetic energy vary inversely in molecules of solids, liquids and gases.
The energy and intermolecular forces that are involved for liquid solid and gas are explained below:
Solids: solids have strong intermolecular forces and low kinetic energy. Thus solids have definite shapes and volume.Liquids: liquids have weaker intermolecular forces and higher kinetic energy than solids.Gases: gases have negligible intermolecular forces and very high kinetic energy.In conclusion, intermolecular forces decrease with increase in the kinetic energy of molecules.
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There are three stable forms of neon: neon-20, neon-21, and neon-22. Which statement is true?
A) The number of neutrons are the same.
B) Their number of protons differ.
C) They are radioactive, like all isotopes.
D) Their atomic masses differ.
Looking at the forms of neon in the question as shown, we can see that; their atomic masses differ. Option D
What are isotopes?The term isotopes has to do with the atoms that have the same atomic number but do not have the same mass number. The mass number is the sum of the number of protons and the neutrons. Given that the number of protons is a constant and it is the identity of the element, we are now left with the understanding that the difference between the mass numbers of the isotopes must stem from the very given fact that the neutrons that are found in the both isotopes are just not of the same number.
Having said all of these, we could now look at the isotopes that we have which are the isotopes of neon that have all been labeled as; neon-20, neon-21, and neon-22.
Following from the explanations that have been afore given above, we could easily arrive at the conclusion that; their atomic masses differ.
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What is the ph of a buffer solution prepared with 0.055 m sodium acetate and 0.01m acetic acid. the pka value of acetic acid is 4.76 at 250c.
The ph of a buffer solution prepared with 0.055 m sodium acetate and 0.01m acetic acid at the pka value of acetic acid is 4.76 at 250c is 5.5.
What is a buffer solution?A weak acid and its conjugate base, or vice versa, are combined to form an aqueous solution known as a buffer solution (more specifically, pH buffer or hydrogen ion buffer). A little bit of a strong acid or base applied to it barely affects its pH.
Strong acids or bases applied in modest amounts don't cause buffer solutions to shift pH. An illustration of a buffer made up of a weak acid and its salt is a solution of acetic acid and sodium acetate CH3COOH + CH3COONa.
The three primary buffer systems in the human body are the phosphate, protein, and carbonic acid bicarbonate systems.
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Question 1: (answer in place of item 16)
Apple juice has a pH of around 3 and lemon juice has a pH near 2. If you were trying to neutralize the acid of these fruit juices for baking, which juice would need more baking soda? Why?
(Extra Credit: if the apple juice needed .21 g of soda to neutralize it,
how much soda would an equal quantity of lemon require?)
Question 2:(answer in place of item 17)
What is a mole and what is molarity? How are these ideas similar and how are they different?
Question 3:(answer in place of item 18)
Hexane is a non-polar solvent and ethanol is a polar solvent.
Which of these would you choose to dissolve an ionic salt like LiCl? Why?
Question 4:(answer in place of item 19)
The pH of a solution has a big effect on the speed of some reactions and some reactions only happen in a certain pH range. Why is acid base chemistry important for medicine?
1. Apple juice has a pH of around 3 and lemon juice has a pH near 2. to neutralize with baking soda lemon juice would need more baking soda because it is more acidic than aple juice. the less ph present the more baking soda need to neutralize.
2. A "mole" is the quantity of a material that is precisely 6.02214076 X 1023 particles in the International System of Units. Ions, atoms, or molecules might make up the particles.
The number of moles of a solute in a litre of solution is known as molarity (M). The symbol for molarity is M, which stands for mole/liter.
Molarity is a measure of a solution's concentration that is expressed in units of moles per litre. Therefore, molarity is utilised to calculate the solute's volume.
3 Hexane will dissolve in ionic salt like LiCl because both of the compound are covalent and non-polar and like dissolves like.
4.Every enzyme has a preferred pH range. Outside of this range, pH changes will limit enzyme activity. Enzymes can denature at extreme pH levels. If there is a substrate available for the enzyme to bind to, increasing the concentration of the enzyme will hasten the process.
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Consider 1 l of air in a patients lungs at 37 c and 1.00 atm pressure. what volume would this air occupy if it were at 25 c under a pressure of 5.00 x 10^2 atm.
The volume of the air occupies can be 0.001922 L = 1.92mL.
To calculate the volume , the given data's are,
P₁ = 1.0 atm,
V₁ = 1 L,
T₁ = 37°C
P₂ = 500.0 atm,
T₂ = 25°C
What is the law of ideal gas?The standard definition of the ideal gas law can be stated as that for any gas, its volume (V) multiplied by its pressure (P) is equal to the number of moles of gas (n) multiplied by its temperature (T) multiplied by the ideal gas constant, R.
we can use the formula for general law of ideal gas:
PV = nRT.
where, P is the pressure of the gas in atm,
V is the volume of the gas in L,
n is the no. of moles of the gas in mol,
R is the general gas constant,
T is the temperature of the gas in K.
If n is constant, and have two different values of (P, V and T):
P₁V₁T₂ = P₂V₂T₁
P₁ = 1.0 atm, V₁ = 1 L, T₁ = 37°C + 273 = 310 K.
P₂ = 500.0 atm, V₂ = ??? L, T₂ = 25°C + 273 = 298 K.
Hence,
V₂ = P₁V₁T₂/P₂T₁
= (1.0 atm)(1 L)(298 K)/(500.0 atm)(310 L)
= 0.001922 L
= 1.92 mL.
Hence, the volume of the air occupy is 1.92 mL.
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Which amino acid residue's backbone forms a hydrogen bond with the backbone of the third (3rd) residue?
Amino acid 7 residue's backbone forms a hydrogen bond with the backbone of the third (3rd) residue.
What are amino acids?
An amino acid is an organic molecule composed of a basic amino group (NH 2), an acidic carboxyl group (COOH), and an organic R group (or side chain) that is unique to each amino acid. Informally, an amino acid is alpha-amino [alpha-amino] carboxylic acid.
The hydrogen atoms on both of the leftover groups must be bound to electronegative atoms for hydrogen bonding to take place between the residual molecules of the second molecule. Fluorine, oxygen, nitrogen, and chlorine are some of these atoms. These atoms have the capacity to impart a charge on the hydrogen atom, enabling hydrogen bonding.
Amino acid 7 residue's backbone forms a hydrogen bond with the backbone of the third (3rd) residue.
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If 8.4 moles of disilane, si2h6 are combined with 15.1 moles of o2, which is the limiting reactant ?
Oxygen (O₂) is the limiting reactant.
Balanced chemical equation for reaction of disilane with oxygen:
2Si₂H₆ + 7O₂ → 4SiO₂ + 6H₂O.
Word equation: disilane + oxygen → silicon dioxide + water.
n(Si₂H₆) = 8.4 mol; amount of disilane
n(O₂) = 15.1 mol; amount of oxygen
From balanced chemical equation: n(Si₂H₆) : n(O₂) = 2 : 7
mole ratio for disilane = 8.4 mol / 2 = 4.1 mol
mole ratio for oxygene = 15.1 mol / 7 = 2.15 mol
Oxygen is the limiting reactant, because it has smaller mole ratio than disilane.
Limiting reactant determine amount of the product formed in a reaction.
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An ion is a____version of an atom that is formed by____compared to the atom.
An ion is a charged version of an atom that is formed by losing or gaining electrons compared to the atom.
Cations are positively charged atoms.
Anions are negatively charged atoms.
For example, calcium atom forms cation.
Electron configuration of calcium atom: ₂₀Ca 1s² 2s² 2p⁶ 3s² 3p⁶ 4s².
Electron configuration of calcium cation: ₂₀Ca²⁺ 1s² 2s² 2p⁶ 3s² 3p⁶.
Calcium cation is smaller than neutral calcium atoms, because when an electrons are lost, electron-electron repulsion decreases and the protons are better able to pull the remaining electrons towards the nucleus.
When calcium loose two electrons, it will have 20 protons (positive charge) and 18 electrons (negative charge), which means it has two protons more and it has +2 oxidation number.
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What can you determine from the following scenario?
An object at rest is pulled in opposite directions by unequal forces.
Use claims, evidence, and reasoning
The object at rest moves to the direction of the greater force when it is pulled in opposite directions by unequal forces.
According to Newton’s first law of motion, a body at rest does not move until an external force is applied to it.
When an equal force is applied in the opposite directions, the object remains at rest as the net force becomes zero.
When an unequal force is applied in the same direction, the body moves in the direction of the force being applied, but when the unequal forces are in opposite direction, the object moves in the direction which has greater force.
The net force, which results from the difference between two unequal forces acting in opposition on an object, is what moves it. Resultant is the name given to the overall or net force and its direction.
For example, a force of 30N is applied from the right and 55N is applied from the left on an object. The net force will be 55 – 30 = 25N. Therefore, the object will move to the left with a force of 25N.
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Define Projectile:
A projectile is launched with an initial horizontal velocity from a cliff and follows a parabolic path to the ground. Predictable unknowns include the initial speed of the projectile, the initial height of the projectile, the time of flight, and the horizontal distance of the projectile.
A projectile is launched with an initial horizontal velocity from a cliff and follows a parabolic path to the ground and include the initial height of the projectile
Projectile is a body projected by external force and continuing in motion by its own inertia and the velocity is constant horizontally it means that means the acceleration is zero and initial vertical velocity is zero projectiles travel with a parabolic path due to the fact that the downward force of gravity accelerates them downward from their straight-line gravity-free
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Ow many molecules of ethanol (c2h5oh) (the alcohol in alcoholic beverages) are present in 630 ml of ethanol? the density of ethanol is 0.789 g/cm3.
Taking into account the definition of density and Avogadro's number, 65.07×10²³ molecules of ethanol are present in 630 ml of ethanol.
We can calculate density to determine how much mass there is in a given volume of a substance. The quotient of a body's mass and the volume it occupies is therefore the formula for calculating density:
Density = mass / volume
So, 0.789 = mass / 630
mass =497.07grams
Then the number of moles that 110.46 g of ethanol contain is calculated by: 497.07/46 = 10.80 moles
The number of particles that make up a substance (often atoms or molecules) and may be found in a mole of that substance is known as Avogadro's Number or Avogadro's Constant. The number of particles per mole is [tex]6.022*10^{23}[/tex]. Any substance can be calculated using Avogadro's number.
So, amount of molecules= (10.80 moles× 6.023×10²³ molecules)÷ 1 mole = 65.07×10²³ molecules.
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If you put a strong acid in 100 ml of water and then you put the same amount of a weak acid in 100 ml of water, why would the ph be lower in the beaker with the strong acid?
The pH be lower in the beaker with the strong acid because strong acid gives more hydrogen ions.
pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity an aqueous solution.
When pH is less than seven (pH<7), solution is acidic.
Hydrochloric acid is strong acid and in water dissociates completely:
HCl(aq) → H⁺(aq) + Cl⁻(aq)
Amount of hydrogen ions are the same as amount of hydrochloric acid.
At other hand, acetic acid (CH₃COOH) is weak acid and does not dissociate completely as HCl, so concentration of hydrogen ions in a solutions are very low.
Strong acids: HNO₃(nitric acid), HCl(hydrochloric acid), H₂SO₄(sulfuric acid), HI(hydroiodic acid).
Weak acids:CH₃COOH (acetic acid), H₂CO₃ (carbonic acid), HCN (cyanic acid).
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What+is+the+molar+fraction+of+25%+w/w+acetic+acid+solution?+(density+=+1.05kg/l,+mw+=+60)+answer+(0~1)
The molar fraction of 25% w/w acetic acid solution is 0.069.
The molar fraction of solute in a solution is given by the following formula
Molar fraction of solute = No. Of Moles of solute/No. Of Moles of solute + No. of Moles of solvent
In this case the solute is acetic acid and solvent is water.
It is given that the acetic acid is 25% weight by weight(w/w), which means that 25 grams of acetic acid is present in 100 grams of water.
To calculate the moles, we need to divide the given mass by the molar mass of the compound
No. of moles of Acetic Acid(CH3COOH)= 25/60 = 0.416
And no. of moles of water (H2O) = 100/18 = 5.55
Putting the values in the given formula
Molar fraction of solute = 0.416/5.55+0.416
= 0.069
Hence, the molar fraction of 25% w/w acetic acid solution is 0.069.
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Practice another a small mailbag is released from a helicopter that is descending steadily at 1.63 m/s. (a) after 5.00 s, what is the speed of the mailbag?
After 5.00 s, the speed of the mailbag is 50.63 m/s.
v = 1.63 m/s; the initial speed of a small mailbag
a = 9.8 m/s²; the acceleration of a small mailbag
t = 5.00 s; time
Ending speed is defined as the speed attained by a body after completing distance at certain time interval:
v(ending speed) = v(initial speed) + a × t
v(ending speed) = 1.63 m/s + 9.8 m/s² · 5.00 s.
v(ending speed) = 50.63 m/s
Velocity is equivalent to a specification of its speed and direction of motion, for example 100 km/h to the east.
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Just question 2 pleasee
The correct matching of the properties of the elements are;
Rubidium - catches fire as soon as it s exposed to air and burns fiercely
Lithium - hard to set alight but burns with a deep red flame
Potassium - Melts readily on heating with a Bunsen flame and catches fire easily. Burns with a mauve flame.
Sodium - Melts fairly readily with Bunsen flame then catches fire and burns with a deep yellow flame
What are the properties of the elements?We know that elements are classified into groups. The groups are a family of elements that have similar chemical and physical properties. Now we have the to match the properties of the elements as shown;
Rubidium - catches fire as soon as it s exposed to air and burns fiercely
Lithium - hard to set alight but burns with a deep red flame
Potassium - Melts readily on heating with a Bunsen flame and catches fire easily. Burns with a mauve flame.
Sodium - Melts fairly readily with Bunsen flame then catches fire and burns with a deep yellow flame
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What is created by the flow of electric current?
Answer:
Electric current generates an accompanying magnetic field, as in electromagnets. When an electric current flows in an external magnetic field, it experiences a magnetic force, as in electric motors. The heat loss, or energy dissipated, by electric current in a conductor is proportional to the square of the current.
Explanation:
If+a+student+needed+to+make+25.678g+alum+and+koh+and+h2so4+are+in+excess,+how+much+al+should+the+student+start+with+knowing+that+they+would+only+get+an+80%+yield+of+alum
Al is equal to 0.0463 moles of aluminum in 1.25 grams.
The ratio of aluminum to alum is 1:1, meaning that for every mole of aluminum consumed, 1 mole of alum is created.
The calculated yield is 21.96 g of alum.
Yield as a percentage is 68.97%.
What is alum?Acute and chronic oral LD50 values for aluminum sulfate are both more than 5,000mg/kg, making it relatively non-toxic. Alum can nonetheless irritate the skin, burn, and worsen respiratory conditions. It can lead to headaches, nausea, and respiratory irritations when breathed.
It is an astringent, which means it causes the skin to constrict or shrink, first of all. Astringents have the short-term ability to shrink pores and tighten skin. Alum is a helpful preservative because it is bacteriostatic, which means it inhibits the growth of bacteria.
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What types of catalyst is called a postive catalyst?
Answer:
Positive catalysts are those catalysts which increase the rate of the reaction This means that the activation energy of the reaction is lowered, and the speed of the reaction also increases. An example of positive catalysis is decomposition of potassium chlorate.
Explanation:
What is the net force and direction of the airplane?
The net force on the plane is 700 N.
What is force?We know that force is that which causes motion. Force is a vector quantity. This implies that the force force could have both a magnitude and a direction. The direction of force is the area where the force acts towards.
In this case, we have an airplane that is acted upon by three forces;
Wind forceAir frictionForce of the engineTaking the direction of the engine force as positive and the direction of the air friction and the wind force as negative we can now obtain the magnitude of the net force that acts on the plane as;
800 N - ( 40 N + 60 N) = 700N
Hence the net force on the plane is 700 N.
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The electronic configuration of an ion is 2.8.8. What could this ion be?
Answer: The answer Option is A.
Explanation: Both the Ions have the electronic configuration 2,8,8
The electronic configuration of an ion is 2.8.8. This ion is S²⁻.
What is an electronic configuration ?The term electronic configuration is defined as the arrangement of electrons in orbitals around an atomic nucleus.There are four different types of orbitals (s,p,d, and f) have different shapes, and one orbital can contain a maximum of two electrons.
The symbols used for writing the electron configuration start with the shell number (n) and then the type of orbital and finally the superscript represent how many electrons are present in the orbital.
The electronic configuration of an ion is 2.8.8. This ion is S²⁻. Because S²⁻ contain electronic configuration of an ion is 2.8.8 while electronic configuration of S is 2, 8, 6.
Thus, The electronic configuration of an ion is 2.8.8. This ion is S²⁻.
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How many Cl atoms are in 0.0467 g of PCl₃?
Answer:
The answer is there are 9.57 x 10²⁰ number of Cl atoms in 0.0728 g of PCl₃.
Number of moles = mass / molar mass
Mass of PCl₃ = 0.0728 g and molar mass of PCl₃ = 137.33g/mol
Number of moles of PCl₃ = 0.0728 / 137.33 = 5.3 x 10⁻⁴
In one mole there are Avogadro’s number of molecules that is 6.02 x 10²³
So, in 5.3 x 10⁻⁴ moles of PCl₃, there are =5.3 x 10⁻⁴ x 6.02 x 10²³ = 3.19 x 10²⁰
Now there is 3 atoms of Cl in PCl₃ so in 3.19 x 10²⁰ molecules of PCl₃, number of Cl atoms = 3.19 x 10²⁰ x 3 = 9.57 x 10²⁰ atoms
