11.10 moles of cacl2 are required
Lets 0.24000000000000002m approx. be 0.2m
so, Molarity = 0.2m
volume = 500 ml
we know that
molarity = no. of moles of solute (cacl2) / volume of solutions
0.2m = n / 0.5 L
n = 0.1 moles of cacl2
now,
1 mole of cacl2 = 110.98 gm
so,
o.1 moles of cacl2 = 11.10 gm
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30 years ago, 22.5% of the population—45 out of 200 people—were taller than 1.2 meters. Currently, at least 1.2 meters tall people make up 50.5% of the population. Individuals who are under 1.2 meters tall have dramatically dropped throughout the course of the two years of data. This information lends credence to the claim that directed selection is taking place.
The evidence in the question shows that there is a directional evolution that is taking place as the percentage of the tall individuals is increasing.
What is directional selection?We know that the term natural selection implies that the organisms that are are better able to live and survive in a habitat are the ones that are able to live longer and reproduce and by so doing, they are able to transfer the favorable traits that they posses to their offspring.
Now we can also relate to the fact that the idea of directional selection is takin place when there is a situation in which the trend in the evolution seems to favor only one type of trait over another the other type of trait and this leads to a gradual increase in the abundance of the favored trait in the population.
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One mitigating strategy for ______________ is______________. I learned that people need to do _____________to mitigate the effects of___________
Answer:
One mitigating strategy for planning and zoning is to protect people and the environment from the nuisance impacts of facilities like landfills, sewage treatment plants and factories through land use planning tools. I learned that people need to Reduce greenhouse gas emissions through their food choices to mitigate the effects of using Renewable energy.
what is the empirical formula of a compound containing c, h, and o if combustion of a 0.500-g sample of the compound produces 0.955 g co2 and 0.587 g of h2o? (put a number in every blank, even if it is a 0 or 1.)
The empirical formula of a compound containing c, h, and o is C₂H₆O₁.
In chemistry, the empirical formula represents the simple whole-number ratio of the atoms which are present in the compound. The initial step is to calculate and determine the masses. The next step which follows is to calculate the number of moles by dividing the grams by the atomic mass. Next, the number of moles is divided by each element by the smallest number of moles. Finally, we convert numbers to whole numbers since we don't represent empirical formulas in decimals.
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1.00 L aqueous solution containe nod 5.80 g of sodium hydroxide, NaOH. What was the pH of the solution at 25°C? (Hint: strong acid and strong base titration, use limiting reactant)
The pH of the solution is 13.16.
What is the pH of the base?We know that the pH has to do with the concertation of the hydrogen ions that we have in the solution. We have to first obtain the concentration of the hydroxide ions and then use that to obtain the pH of the solution accordingly.
Number of moles of NaOH = 5.80 g/40 g/mol = 0.145 moles
Concentration of the solution = 0.145 moles/1 L = 0.145 M
pOH = - log( 0.145 M)
= 0.84
pH = 14 - 0.84
= 13.16
We can get the pH of the solution as 13.16.
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Which of these is NOT a neutralisation reaction?
Answer:
Magnesium + hydrochloric acid → magnesium chloride + hydrogen
why? because the product of a neutralization reaction are always a salt and water. This reaction is the only one which does not have water as a product, so it is not neutralization.
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Without stratospheric ozone (o3), harmful solar radiation would cause gene alterations. ozone forms when the bond in o2 breaks and each o atom reacts with another o2 molecule. it is destroyed by reaction with cl atoms formed when the c―cl bond in synthetic chemicals breaks. find the wavelengths of light that can break the c―cl bond and the bond in o2. give your answers in scientific notation.
The wavelengths of light that can break the Cl-Cl bond and the bond in O₂ will be λ = 3.53 × 10⁻⁷ m and λ =2.4 × 10⁻⁷ m respectively.
Cl-Cl- Bond energy (E)= 339 KJ/mol
O=O Bond energy (E)= 498 KJ/mol
h = 6.626 × 10⁻³⁴ J.s
c = 3 × 10⁸ m/s
N = 6.02214076 × 10²³
For Cl-Cl bond
We will use the following formulae
λ = Nhc/E (for one mol photons)
Put the values
λ = [(6.02214076 × 10²³ p/mol)(6.626 × 10⁻³⁴ J.s)(3 × 10⁸ m/s) / (339 × 10³ J/mol)] × 1 nm / 10⁻⁹ m
λ = 353 nm
λ = 3.53 × 10⁻⁷ m
For O=O bond
We will use the following formulae
λ = Nhc/E (for one mol photons)
Put the values
λ = [(6.02214076 × 10²³ p/mol)(6.626 × 10⁻³⁴ J.s)(3 × 10⁸ m/s) / (498 × 10³ J/mol)] × 1 nm / 10⁻⁹ m
λ = 240 nm
λ = 2.40 × 10⁻⁷ m
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a sample of he gas has a volume of 322 ml and a pressure of 0.9 atm. what will be the pressure, in atm, if the sample of helium is compressed to 125 ml?
The pressure, in atm, if the sample of helium is compressed to 125 ml is 2.32 atm
An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.
Volume is a degree of occupied three-dimensional space. it's far more frequently quantified numerically the usage of SI-derived gadgets or by way of diverse imperial gadgets. The definition of length is interrelated with the extent.
Using the ideal gas equation:-
At constant temperature
Given;
P₁ = 0.9 atm
V₁ = 322 ml = 0.322 L
P₂ = ?
V₂ = 125 ml = 0.125 L
P₁V₁ =P₂V₂
P₂ = P₁V₁ /V₂
= 0.9 × 0.322 /0.125
= 2.32 atm
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a gas mixture of xe, ne, and ar has a total pressure of 12.20 atm. what is the mole fraction of xe if the partial pressures of ne and ar are 2.10 and 4.50 atm, respectively?
6.6 is the mole fraction of xe if the partial pressures of ne and ar are 2.10 and 4.50 atm, respectively.
Why is partial pressure called?The idea of partial pressure is driven by the fact that each individual gas contributes to the overall pressure in a given proportion, which corresponds to its partial pressure. In order to characterize all the pieces, it is essentially equivalent to taking a % or proportion of the whole.
Briefing:The total pressure is equal to the sum of the individual pressures, according to Dalton's law.
Ptotal = total pressure of gases = 12.20 atm
Pne = partial pressure of ne = 2.10 atm
Par = partial pressure of ar = 4.50 atm
Pxe = partial pressure of xe = ?
putting in the values we get:
12.20 = 2.10 + 4.50 + Pxe
Pxe = 5.6
We employ Dalton's law to determine the solution's vapor pressure, which is:
Ptotal = (Pxe + Xxe)
We are given:
Pxe = partial pressure of xenon = 5.6
Xxe = mole fraction of xenon = ?
Using the values in the aforementioned equation, we get:
12.20 = (5.60 * Xxe)
Xxe = 6.6
The mole fraction of Xe is 6.6 as a result.
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what is the iupac name for the compound shown? a six carbon ring with an oxygen atom double bonded to one of the carbon atoms in the ring.
cyclohexanone is the compound which is shown.
what is cyclohexanone-
The chemical substance known as cyclohexanone has the formula (CH2)5CO. The compound is a six-carbon cyclic molecule with a functional group called a ketone.
IUPAC (International Union of Pure and Applied Chemistry) nomenclature is based on the naming of a molecule's longest chain of carbons connected by single bonds, whether in a continuous chain or in a ring.
six-carbon ring with oxygen bonded to one of the carbon atoms in the ring is cyclohexanone.
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Write a nuclear equation for plutonium-241 emitting gamma radiation?
⁹⁴Pu₂₄₄-------> ⁹⁵Am₂₄₃ + electron is a nuclear equation for plutonium emitting gamma radiation
What radiation does plutonium 241 emit?Alpha particles plutonium is created in an activator when uranium atoms absorb neutrons. Nearly all plutonium is man-made. Plutonium mainly emits alpha particle is a type of radiation that is easily ceased and has a short range. It also emits neutrons, beta particles, and gamma rays. It also emits neutrons, beta particles, and gamma rays.
It is contemplated toxic, in part, because if it were to be inhaled it could deposit in the lungs and finally cause damage. There are five common isotopes of plutonium because it emits alpha particles, plutonium is most menacing when inhaled.
So we can conclude that Plutonium isotopes emit alpha rays except for plutonium-241 for which the energy of beta electrons is curiously low.
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Which of the following elements will NOT form
an ion with a -1 charge?
A)Lithium
B)Fluorine
C)Iodine
D)Chlorine
Answer:
Fluorine does not form an ion with a charge of 1+.
silicon nitride (si3n4) is made by a combining si and nitrogen gas (n2) at a high temperature. how much (in g) si is needed to react with an excess of nitrogen gas to prepare 125 g of silicon nitride if the percent yield of the reaction is 95.0%?
The amount of Si needed to react with an excess of nitrogen gas to prepare 125g of silicon nitride if the percent yield of the reaction is 95% is 88.20 g.
We know that,
Percentage (%) yield = ( actual yield /theoretical yield ) × 100
Using this we can derive that,
Theoretical yield = (Actual yield / Percentage(%) yield) × 100
= (125 / 85) × 100 = 147.06g Si₃N₄
The mole ratio of Si: Si₃N₄ = 3 :1
Grams of Si required to produce 147.06 g Si₃N₄,
= ( 3 mole Si /1 mol Si₃N₄) ( 28.05 g Si /1 mole Si) * (1 mole Si₃N₄, /140.3 g Si₃N₄,) *147.06 g Si₃N₄
= 88.20 g Si
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A compound of hydrogen, chlorine, and carbon has a simplest formula of CCIH₂. If in one of its molecules there are two carbon atoms, find its molar mass.
Answer:
99 g/mol
Explanation:
2 carbon atoms in one molecule means double all the other atoms
(12*2)+(35.5*2)+(1*4)=99g/mol
1. what is the impedance of an ac series circuit that is constructed using a 10.0-ohm resistor and a 12.0-ohm inductive reactance and a 7.0-ohm capacitive reactance?
The impedance of an AC circuit with 10 ohm resistor, 12 ohm inductive reactance and 7 ohm capacitive reactance is 11.2 ohm.
What is impedance?
Impedance is the resistance of a circuit to AC which is caused by the combining effects of ohmic resistance and reactance. It is represented by the symbol Z and its unit is ohm. It is a measure of opposition to electric flow.
The impedance of an AC circuit can be calculated by,
Z = [(R^2) + (XL - XC)^2]^1/2
where R = resistance, XL = inductive reactance, XC = capacitive reactance
Z = [(10^2) + (12 - 7)^2]^1/2 = (100 + 25)^1/2 = 11.2 ohm.
Therefore, the impedance of an AC circuit with 10 Ohm resistor, 12 ohm inductive reactance and 7 ohm capacitive reactance is 11.2 ohm.
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a certain aqueous solution boils at 375.60 k (at 1 atm). at what temperature does the same solution freeze?
The aqueous solution here would freeze at -9.163 degree celsius.
The temperature at which it boils is 375.60 K. This gets converted into Celsius = 102.45-degree Celsius (i)
The standard temperature of boiling is = 100 degree Celsius (ii)
The standard temperature of freezing is = 0 degrees celsius (iii)
We know the formula -
Depression in cooling/ Elevation in boiling = [tex]K_{b}[/tex] / [tex]K_{f}[/tex] (iv)
The standard values for both Ks are 0.5 and 1.87 respectively. (v)
Using the given values of (i), (ii), (iii), (iv), and (v), we find that -
= (102.45 - 100.00) / (0 - x) = 0.5 / 1.87
x, here is the temperature for freezing.
= Temperature at which it freezes = - 9.163 degree Celsius.
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TRUE OR FALSE: As the reaction proceeds toward equilibrium, the concentrations of H2 and I2 gradually INcrease, while the concentration of HI gradually DEcreases
False. As the reaction proceeds toward equilibrium, the concentrations of [tex]H_2[/tex] and [tex]I_2[/tex] gradually decrease, while the concentration of HI gradually increases.
What is equilibrium in chemical reactions?In a chemical reaction, an equilibrium is reached when a reaction that proceeds in both ways has both forward and backward reactions at an equal rate.
For example, consider the reaction below:
A + B <---> C + D
At equilibrium, the rate of formation of A and B will be equal to the rate of formation of C and D.
Now, let us apply this to the reaction:
[tex]H_2 + I_2 < --- > 2HI[/tex]
Since the reactants are [tex]H_2[/tex] and [tex]I_2[/tex], initially, their concentrations will decrease while the concentration of the product, HI will increase. This will continue until the reaction reaches an equilibrium.
Thus, that the concentrations of [tex]H_2[/tex] and [tex]I_2[/tex] will gradually increase while the concentration of HI will gradually decrease as the reaction approaches an equilibrium is false.
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the conversion of carbon dioxide to carbonic acid can be catalyzed by carbonic anhydrase with an activation energy of 85.6 kj mol-1at 25c. by what factor will the rate constant increase if the temperature is raised to 37c?
7.133 is the rate constant increase if the temperature is raised to 37c.
factor=rate(T2)/rate(T1) .
The proportionality constant (k) that links the pace of the reaction to the concentrations of reactants is known as the specific rate constant. For any chemical reaction, the rate law and the particular rate constant must be ascertained through experimentation. Temperature affects the rate constant's value.a chemical reaction in which two or more substances interact and change into new ones, or where one substance transforms into another.
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how would you observe the spectra of elements with higher ionization energies such as hydrogen or helium?
If a hydrogen atom could have any value of energy, then a continuous spectrum would have been observed, similar to blackbody radiation.
What is ionization energy ?
Ionization energy (also called ionization potential) is the amount of energy required to remove an electron from an isolated atom or molecule in chemistry and physics. There is an ionization energy for each successively removed electron. However, the ionization energy associated with the removal of the first (most loosely held) electron is most commonly used.
The ionization energy of a chemical element, expressed in joules or electron volts, is usually measured in a discharge tube in which rapidly moving electrons produced by an electric current collide with gas atoms of the element, releasing one of them. will be electronic.
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what causes the lines in these spectra? why are the colors of the lines different? suggest a reason for the observation that the spectrum of calcium is more complicated than the spectrum of hydrogen.
Transitions of electrons within atoms or ions form spectral lines at different rungs which leads to emission of lines of different colors. Spectrum of calcium is more complicated than the spectrum of hydrogen because calcium atom have more electrons than hydrogen.
What are spectral lines?A spectral line in an otherwise smooth and continuous spectral is a dark or bright line resulting from the emission or absorption of light in a narrow frequency range compared to adjacent frequencies. Spectral lines are frequently used to identify atoms and molecules.
The spectral lines arise from electron transitions within an atom or ion. As electrons move toward or away from the nucleus (or ion) of an atom, they release or absorb energy in the form of light (or other radiation).Electrons fall on the lower rung and emit light with the energy of the rung difference. This allows different atoms to emit different colors of light.Calcium has a more complex spectrum. Because calcium has more electrons than hydrogen, there are more possible electronic states and transitions.To know more about spectral lines visit:
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Suppose a man is sitting on a chair and exerting 100 N of force downward, while a spring beneath the chair exerts 150 N of force upward. If you assign a negative value to the downward force, what is the net force of this system? (1 point) O 50 kg O 50 N O 250 N -50 N
A man is sitting on a chair and exerting 100 N of force downward, while a spring beneath the chair exerts 150 N of force upward. The net force acting on the system is in the upward direction with a magnitude of 50N.
Force is the product of mass and acceleration which is dependent on the rate of change of momentum.
According to the given question,
Magnitude of force in the downward direction = 100N
Downward force = 100N
Magnitude of force in the upward direction = 150N
Upward force = -150N
Net force on the system = Upward force + Downward force
Net force on the system = -150N + 100N
Net force on the system = -50N
Hence, the net force acting on the system is in the upward direction with a magnitude of 50N.
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Answer: 50N
Explanation:
22) in the polysaccharide amylose, large numbers of monosaccharides are linked together through . a) alpha 1-4 glycosidic linkages b) beta 1-4 glycosidic linkages c) alpha 1-6 glycosidic linkages d) beta 1-6 glycosidic linkages e) none of the above
In the polysaccharide amylose,a large number of monosaccharides are linked together through alpha 1-4 glycosidic linkages.
Alpha 1-4 linkage is a stored form of sugar in plant. In this carbon atom 1 and 4 of the the two monomers forms a glycosidic bond. Polysaccharides are long chain forms of monosaccharides linked together by glycosidic bonds.A glycosidic bond is a covalent bond that joins a carbohydrate molecule to another group.this bond gives glycogen that is suitable for energy storage.
Amylose is plant starch made from monosaccharide connected through alpha 1-4 linkages.monosaccharides are the simplest form of sugar.from monosaccharides, all carbohydrates are built.
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If you were camping in a rainforest for two days, your presence would cause many changes to the
surroundings. Describe two physical and two chemical changes that could occur as a result of your
experience
Here are 3 alkali metals with physical and chemical similarity.
What is alkali metals?
Alkali metals are come from the fact that when these metals or their oxides dissolved in water.a basic solution results.
Three alkali metals -
1- hydrogen(H)
2-lithium(Li)
3-potassium(K)
physical and chemical similarity of hydrogen -
-it is colourless and tasteless in nature.
-it is a combustible gas but not a supporter of combustion.
physical and chemical similarity of lithium -
-it have a melting point of 180.54
-it is the lightest of all metals,with a density approximately half that of water.
physical and chemical similarity of pottasium -
- this metal is soft and white with a silver lustre.
-it imparts a lavender colour to a flame, and it's vapour is green.
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30 points A 4-column table with 3 rows. The first column titled compound has entries A, B, C. The second column titled melting point (degrees C) with entries negative 183, 660, 772. The third column titled boiling point (degrees C) has entries negative 164, 2467, 1600. The fourth column titled conducts electricity has entries no, yes, yes.
Which compound is most likely a covalent compound?
The compound that is covalent is the compound A.
Which one is a covalent compound?We know that the forces that holds the molecules of an ionic substance together is so strong that the ionic substances are known to have a high melting and a high boiling point. Thus, it is already clear that the compounds B and C are both ionic because they are highly conducting and they also have a high melting and boiling point.
The compound A has a low melting and boiling point and also does not conduct electricity. This goes to tell us that A is a covalent compound.
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Answer:
compound A
Explanation:
edge 2023
The higher the frequency of light, the ___ its wavelength and the ___ its energy.
a. longer, lower
b. longer, higher
c. shorter, lower
d. shorter, higher
Answer:
c
Explanation:
how many milliliters of a 12% (v/v) propyl alcohol solution would you need to obtain 4.5 ml of propyl alcohol
38.1 ml of a 12% (v/v) propyl alcohol solution would need 4.5 ml of propyl alcohol.
What purpose does the isopropyl alcohol solution serve?
A transparent liquid known as propyl alcohol is frequently used to destroy germs (antiseptic).When carbon monoxide and hydrogen are used to create methanol (methyl alcohol), normal (n-) propyl alcohol is produced as a byproduct. Fusel oil contains it as well.As a rubbing alcohol antiseptic, isopropyl alcohol is combined with water. Additionally, it's a component of hand lotions, aftershave products, and other cosmetics. It is employed in industry as a low-cost solvent for gums, shellacs, drugs, cosmetics, and denatured ethanol.To learn more about propyl alcohol, follow the link https://brainly.com/question/29219081
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A car travels 45 km at a speed of 60 km/h. How long does it take the car
to reach its destination?
Answer:
45 mins
Explanation:
it takes 45 minutes long
How can you describe carbohydrates
Write about a time when you experienced or witnessed a microaggression. Connect how you felt to how an element may feel when their electrons are taken away. How do microaggressions relate to ionization energy? How could we use this to explain ionization energy to someone who is not familiar with chemistry?
A time when you experienced microaggression was when i wnet to college in another state. The lecturer in one of my course was very angry that i left my tribe, my state to another state to study. There was element of mockery in his voice.
I felt sad, angry and also bad at the same time. I just wanted to run away from the class because all eyes were on me.
Microaggressions relate to ionization energy through the power they command or hold. I can explain Microaggressions as ionization energy to someone as having the power to aggressively give out a part of you that can be good or bad.
What is an example to clarify what ionization energy is?Ionization energies gauge an atom's propensity to resist losing electrons. For instance, removing an electron from a neutral fluorine atom to create a positively charged ion requires a significant amount of energy.
Note that Microaggressions are everyday verbal, behavioral, or environmental slights that signal hostility, denigration, or negative views toward stigmatized or culturally marginalized groups. They can be deliberate or inadvertent. Chester M., a psychiatrist at Harvard University, originated the phrase.
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Question 9(Multiple Choice Worth 4 points)
(01.03 MC)
Ô
Object A has a mass of 12 g and a volume of 8 cm³. Object B has a mass of 20 g and a volume of 8 cm³. Which object has a greater density and by how much?
O Object A, by 1 gram per cubic centimeter
O Object A by 8 grams per cubic centimeter
O Object B, by 1 gram per cubic centimeter
O Object B, by 8 grams per cubic centimeter
According to the given statement Object B, by 1 gram per cubic centimeter object has a greater density.
What is density ?The measure of how densely a substance is pressed together is called density. As the weight per unit volume, it meets that definition. The formula for density, denoted by the symbol D, is given as follows: density = m/V, where m denotes the object's mass and V its volume.
Does mass affect density?Mass and volume are intimately linked with density. In reality, it explains the precise nature of the connection between the two. By dividing the mass of an object by its volume, we may get its densities. The mass is said to have a low population density if it has a high volume but a tiny mass.
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PLEASE ANSWER FAST
In an ionic bond between 2 sodium atoms and an oxygen atom, what resulting charge would each atom have?
Answer:
Explanation:
Ionic bonds form between two or more atoms by the transfer of one or more electrons between atoms. Electron transfer produces negative ions called anions and positive ions called cations. These ions attract each other.
Explanation: An ionic bond is formed because sodium is a part of the Alkali metals and Oxygen is a non-metal and a gas. 4Na + O2 → 2Na2O (s) OR Na + O2 → NaO2 (s).
Answer:
Explanation:
Ionic bonds form between two or more atoms by the transfer of one or more electrons between atoms. Electron transfer produces negative ions called anions and positive ions called cations. These ions attract each other.