Phosphorus interacts with selenium to generate 77.6 mg of the compound from a sample of 40 mg of phosphorus. Therefore, phosphorus selenide has an empirical formula is P₃Se₁.
A compound's empirical formula is a formula that displays the ratio of the elements contained in the compound but not the precise number of atoms present in the molecule.
The molar mass of phosphorus (P) is 31 g/mol and selenium (Se) is 79 g/mol. Then, computing the moles of phosphorus, we get,
[tex]\begin{aligned}\text{moles of P}&=\mathrm{0.04\;g}\times\mathrm{\frac{1\;mole}{31\;g}}\\&=\mathrm{1.29\times10^{-3}\;moles}\end{aligned}[/tex]
The total mass is 77.6 mg. Then, the mass of selenium is (77.6-40)mg=37.6 mg=0.0376 g. Computing the moles of selenium, we get,
[tex]\begin{aligned}\text{moles of Se}&=\mathrm{0.0376\;g}\times\mathrm{\frac{1\;mole}{79\;g}}\\&=\mathrm{0.476\times10^{-3}\;moles}\end{aligned}[/tex]
Now, divide the mole value of smaller by the mole value of P and Se. We get,
[tex]\begin{aligned}\frac{1.29\times10^{-3}}{0.476\times10^{-3}}}&=2.71=3\\\frac{{0.476\times10^{-3}}}{{0.476\times10^{-3}}}&=1\end{aligned}[/tex]
Therefore, the required answer is P₃Se₁.
The complete question is -
A 40 mg sample of phosphorus reacts with selenium to form 77.6 mg of the compound. What is the empirical formula of phosphorus selenide?
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What is the key difference between test and negative control groups in an experiment?
The key difference between test and negative control groups in an experiment is that Control groups check the mean effectiveness of an intervention whereas test use the technique of matching.
Assigning people on the basis of chance ensures that both known and unknown invalidating factors are cancelled out, and that this occurs automatically rather than being dependent on individual judgment and trustworthiness. In behavioral and social (as well clinical) research, the ideal scientific experiment is a so-called randomized controlled trial, briefly an RCT.
Members of control groups are not supposed to develop group cohesion because that would entail a contaminating factor in the experiment. Researchers are interested in the average response of individual members rather than in their behavior as a group (see Clinical Trials and Intervention Studies).
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10 g of an unknown compound is added to water to form a 7.89 molar solution. if two liters of solution are present, what is the molar mass of the unknown compound?
10 g of an unknown compound is added to water to form a 7.89 molar solution. if two liters of solution are present, the molar mass of the unknown compound is 0.64 g/ mol.
Given that :
The mass of the compound = 10 g
The molarity of the compound = 7.8 M
The volume = 2 L
The number of the moles = molarity × volume in L
= 7.89 × 2
= 15.78 mol
The molar mass = mass / moles
= 10 / 15.78
= 0.64 g/mol
Thus, the molar mass of the given unknown compound is 0.64 g/mol.
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Demand-pull inflation occurs when
the price of goods rises suddenly and extremely fast.
consumers begin purchasing more goods.
producers need more money to make and distribute goods.
the government prints more money and pushes prices up
Demand-pull inflation occurs when: C. producers need more money to make and distribute goods.
What is demand pull inflation?Demand pull inflation occur when there is no balance in aggregate demand and aggregate supply and this tend to occur when the demand for goods and service is higher that the supply.
Demand pull inflation arise when people have the money to buy goods but the goods or product in the market is not sufficient leading to scarcity of goods due to large demand of that goods in the market.
Based on this demand pull inflation tend to rise because producers or manufacture need more money to produce and distribute goods so as to equate demand and supply.
Therefore we can conclude that the correct option is C.
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Part A Watch the animation and select the interactions that can be explained by hydrogen bonding Check all that apply: View Available Hint(s) CH molecules interact more closely in the liquid than in the gas phase_ HF has higher boiling point than HCL
Ice Hzo, has solid structure with alternating H-0 interactions HF is a weak acid neutralized by NaOH HTe has higher boiling point than HzS_ Submit
The interactions that can be explained by hydrogen bonding is the HF has higher boiling point than HCl and Ice H₂O, has solid structure with alternating H--O interactions .
The hydrogen bonding is the bonding form due to the dipole - dipole interaction between the hydrogen atom which is bonded to the highly electronegative atom. The hydrogen bonding is the type of the intermolecular force. The hydrogen bonding are of the two types :
Intermolecular hydrogen bondingIntramolecular hydrogen bondingThus the correct ones are the the HF has higher boiling point than HCl and Ice H₂O, has solid structure with alternating H--O interactions .
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how does the size of the family affect meal plan
The size of the family affects meal planning by determining the quantity of food needed and the number of people to serve.
Does a larger family require more meal planning and preparation compared to a smaller family?Yes, a larger family typically requires more meal planning and preparation compared to a smaller family. This is because a larger family typically requires more food and ingredients, and often a wider variety of meals to accommodate different dietary needs and preferences. Additionally, a larger family may have more mouths to feed and therefore require more frequent meals and snacks throughout the day. Meal planning and preparation for a larger family can be more time-consuming and demanding, but with the proper organization and planning, it can be manageable.
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Label each reactant and product in this reaction as a Bronsted acid or base.
HCN + NH2- >><< CN- + NH3
This indicates that it is a proton acceptor, which qualifies it as a Bronsted base.
What is Bronsted base?Any species that can accept a proton and needs one pair of electrons to bond to the H+start text, H, end text, start superscript, plus, end superscript is referred to as a Brnsted-Lowry base. Since water is amphoteric, it can function as both a Brnsted-Lowry acid and a base. A Bronsted-Lowry base is a compound that can accept a hydrogen ion, whereas a Bronsted-Lowry acid can donate one. A Lewis base is a substance that can give up two electrons, whereas a Lewis acid can take in two electrons.
Here,
It qualifies as a Bronsted base because this suggests that it is a proton acceptor.
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Given the following reaction:
Cu + 2AgNO3 → 2Ag + Cu(NO3)2
How many grams of Ag will be produced from 5.00 g of Cu and 1.00 g of AgNO3?
Answer:
0.648 g of Ag ( silver) is produced
Explanation:
First calculating the moles of the reactants given;
Cu = 5/64 = 0.078 moles
Mr ( molecular mass) of AgNO3 = 108 + 14 + (16 x 3)
= 170 g
Now the moles of AgNO3 ;
1/170 = 0.006 moles
setting up mole ratio to calculate the limiting reactant:
moles of Cu : moles of Ag
1 : 2
0.078 : X
X = 0.078 x 2
= 0.156 moles of Ag
moles of AgNO3 : moles of Ag
2 : 2
0.006 : X
X = (0.006 x 2)/2
= 0.006 moles of Ag
As silver nitrate ( AgNO3) gives the least number of moles of Ag therefore it is the limiting reactant and would control the amount of product formed.
Now the mass of Ag formed:
atomic mass x moles
= 108 x 0.006
= 0.648 g of Ag ( silver) is produced
predict the sign of the entropy change, δs∘, for each of the reaction displayed. Drag the appropriate items to their respective bins.
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Ag+(aq)+Cl−(aq)→AgCl(s)
2KClO3(s)→2KCl(s)+3O2(g)
2N2O(g)→2N2(g)+O2(g)
2Mg(s)+O2(g)→2MgO(s)
C7H16(g)+11O2(g)→7CO2(g)+8H2O(g)
H2O(l)→H2O(g)
Positive
Negative SubmitHintsMy AnswersGive UpReview Part
The predicted sign of the entropy change in each reaction are as follows;
Ag+(aq). + Br−(aq) → AgBr(s). --Negative
CaCO3(s) → CaO(s)+CO2(g) --Positive
2NH3(g) → N2(g)+3H2(g) --Positive
2Na(s). + Cl2(g) → 2NaCl(s) --Negative
C3H8(g)+5O2(g)→3CO2(g)+4H2O(g) --Positive
I2(s) → I2(g). --Positive
What is entropy change?Entropy of a system or chemical entity is the degree of disorderliness in the substance. The change in entropy, ΔS∘ is a measure of the difference between the entropy of products and the reactants and is given mathematically as ΔS∘ = S(products) - S(reactants).
Here,
Following are the reactions' predicted entropy changes and their predicted signs:
Ag+(aq). + Br−(aq) → AgBr(s). --Negative
CaCO3(s) → CaO(s)+CO2(g) --Positive
2NH3(g) → N2(g)+3H2(g) --Positive
2Na(s). + Cl2(g) → 2NaCl(s) --Negative
C3H8(g)+5O2(g)→3CO2(g)+4H2O(g) --Positive
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milk of magnesia is an oral alkaline suspension of hydrated magnesium carbonate in water and can be used as an antacid. where is it absorbed?
Milk of magnesia is typically absorbed in the stomach and small intestine. As an antacid, it neutralizes stomach acid, which can help to relieve symptoms of indigestion and heartburn.
Milk of magnesia is an oral suspension of hydrated magnesium carbonate in water. It is used as an antacid to neutralize stomach acid and relieve symptoms of indigestion and heartburn. It is typically taken by mouth and is absorbed in the stomach and small intestine. It is not absorbed into the bloodstream and does not have a systemic effect on the body. It can also be used as a laxative.
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samples of two pure substances are heated at a constant rate, and their temperature as a function of time is recorded. both substances started as solids and melted. the mass of the two samples is the same. is the melting point of substance a (i) greater than, (ii) less than, or (iii) equal to the melting point of substance b? explain your reasoning.
Prior to melting, both compounds were solids at first. Both samples were the same mass. The melting point of substance A is the same as that of substance B.
Two pure substance samples are heated continuously, and temperature is measured as a function of time. Melting point is the temperature at which a substance changes state from a solid to a liquid (or, less frequently, liquefaction point). At the melting point, there is an equilibrium between the solid and liquid phases. Chemicals that are produced by the chemical industry can be divided into three groups based on the volume of production: bulk chemicals, fine chemicals, and chemicals found. Prior to melting, both components were solids at first. Both samples were the same mass. The melting point of substance A is the same as that of substance B.
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Determine the pH of a 0.232 M Mg(OH)2 solution at 25°C A. 13.67 B. 13.37 C. 0.634 D. 12.73 E. 0.333
the pH of a 25°C, 0.232 Mg(OH)2 solution Mg(OH)2 is dissolved as Mg(OH)2 = Mg2+ + 2 OH- 0.232 M —-0.232 M in the following order: A. 12.78 B. 13.37 B ) 0.634 D. 15.32 E. 0.333
What pH does a 0.20 M naoh have?to 0.70
Since a strong acid like nitric acid completely dissociates, the hydronium ion's concentration is also equivalent to 0.20 Metres acid. With this information, we can now determine the method's pH level. The solution has a pH of exactly 0.70.
How do you determine pH?You have to know the hydronium ion concentration in mole per liter to determine overall pH of an aqueous phase (molarity).After that, the pH is determined using the formula pH ≈ - log [H3O+]. You can alternatively write the pH Formula as. l o g [H +] = p H Problems With the pH Formula. Problem 1: Determine the ph of a solution in which there are 8.0 10-8M hydronium ions.
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which point on the potential energy diagram corresponds to the species shown to the right for the electrophilic nitration of benzene with hno3/h2so4
Point (c) C on the potential energy diagram corresponds to the species shown to the right for the electrophilic nitration of benzene with hno3/h2so4.
There have been many other observed substitution reactions involving benzene; the five reactions that have proven to be the most beneficial are described here (chlorination and bromination are the most common halogenation reactions). The term "Electrophilic Aromatic Substitution" is usually used to refer to these reactions since the chemicals and conditions that are used in them are electrophilic. In order to carry out the first stage of the substitution reaction, the catalysts and co-reagents are used to produce the powerful electrophilic species that are required. The particular electrophile that was hypothesized to have a role in each distinct type of reaction is presented in the column to the right.
Point C on the potential energy diagram corresponds to the species shown to the right for the electrophilic nitration of benzene with hno3/h2so4.
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IR spectroscopy of cyclohexanol Definition
The infrared radiation study of the molecule is called IR spectroscopy. This spectroscopy is of lower energy and higher wavelength which is used to probe the different functional groups present in a molecule by vibrating the bond of the molecules.
By vibrating the bonds between the molecules, this spectroscopy, which has a lower energy and longer wavelength, is used to examine the various functional groups that are present in a molecule.
What is the cyclohexanone IR frequency?
In the range of 4000-150 cm-1, the infrared spectra of cyclohexane in both its liquid and vapor phases have been investigated. The infrared band caused by the vibration of the Eu skeletal deformation was discovered at 248 cm1.
What does the term "IR spectroscopy" mean?
The IR spectroscopy theory is based on the idea that molecules have a tendency to absorb particular light frequencies that are unique to the corresponding structure of the molecules.
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calculate the volume in milliliters of a 1.33 m calcium bromide solution that contains of calcium bromide . be sure your answer has the correct number of significant digits.
The volume of 1.33 mol/L calcium bromide solution that contains 125 g of calcium bromide is 470 mL
The volume can be calculate as follows:
First we should calculate the moles of calcium bromide
The moles of calcium bromide = Mass/ mass molar
The moles of calcium bromide = 125 g / 199.89 g/mol
The moles of calcium bromide = 0.625 moles
from de question we know that the molar of the solution is 1.33 mol/l
we also know that Molar = moles/ volume
so the volume is gonna be
volume= moles/ molar
volume = 0.625 moles/ 1.33 mol/L = 0.47 L = 470 mL
Therefore, the volume of 1.33 mol/L calcium bromide solution that contains 125 g of calcium bromide is 470 mL
Your question is incomplete but most probably your full question was
calculate the volume in milliliters of a 1.33 mol/L calcium bromide solution that contains 125 g of calcium bromide . be sure your answer has the correct number of significant digits.
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what is going on in the mantle and it’s connection to the feature on the surface ?
The motion of material is what is going on in Earth's mantle, powered by heat from the deep interior, moves tectonic plates on our planet's surface and this motion generates earthquakes, fuels volcanic activity, and shapes surface landscapes.
What is a Mantle?This is referred to as a layer inside a planetary body bounded below by a core and above by a crust and it is usually made up of rocks or ice which undergoes various forms of motion.
The motion which goes on in the mantle is as a result of the force which is generated from the heat in the deep interior which moves tectonic plates on our planet's surface as depicted in the diagram given.
The result is the formation of earthquakes, fuels volcanic activity, and and it also shapes the surface landscapes thereby making it the reason why it was chosen as the correct choice.
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the empirical formula of a compound is no2. its molecular mass is 92 g / mol. what is its molecular formula.
The substance, whose empirical formula is NO2 and whose molecular mass is 92 g/mol, has the molecular formula N2O4 (dinitrogen tetroxide).
What exactly are empirical formulas?Empirical formula is a compound's chemical formula that only specifies the ratios of the elements it contains and not the precise number or arrangement of the atoms. This would be the compound's element with the smallest whole number ratio.
molecular formula = empirical formula × n
where "n" is the total number of components required to construct a molecular formula.
molar mass of your compound is 92 g/mol (Given)
It implies that molar mass of every atom in that molecule must equal 92 g/mol.
1×14.0067 g/mol + 2×15.9994 g/mol = 46.0055 g/mol
So, if one building block has a molar mass of 46.0055 g/mol, how many would you need to get the molecule?
46.0055 g/mol × n = 92 g/mol
n = 92g/mol / 46.0055 g/mol = 1.99976 ≈ 2
As a result, the substance's molecular formula, which includes a list of each atom that constitutes a molecule, will be
(NO2) × 2 = N2O4 (dinitrogen tetroxide)
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Donald is writing a chemical name from a chemical formula. He has just identified that there are five atoms of oxygen bonded with two atoms of phosphorus.
What is the chemical name of Donald's compound?
Phosphorus pentoxide is the chemical name for a molecule in which five oxygen atoms are bound to two phosphorus atoms (P2O5).
What is the purpose of phosphorus pentoxide?A potent drying & dehydrating agent is phosphorus pentoxide. P2O5 can be used in a wide range of processes, including the dehydrating of amides to nitriles, which requires for the elimination of a water molecule.
Why is P2O5 a component of fertiliser?Triple super phosphate is the name given to the concentrated superphosphate, which contains 46% P2O5. It is possible to use this fertiliser on any soil and with any crop. It should be used along with organic manure on acidic soils. It may be used prior to, during, or after transplantation.
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what is the molarity of 2500 ml of a solution that contains 160 grams of ammonium nitrate (nh4no3)? group of answer choices 0.600m 0.800m 0.333m 0.450m
The molarity of 2500 ml of a solution that contains 160 grams of ammonium nitrate (nh4no3) is 0.600M.
What is molarity?Molarity is a measure of the concentration of a solution. The concentration of a solution can be determined by measuring the mass of the solute and the volume of the solution. Molarity is a useful measure when trying to understand how much of a solute is present in a given volume of solution. It can be used to compare the strength of different solutions, and also to calculate how much solute is required for a given volume. Molarity is an important concept in chemistry and is used in many areas of science.
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Predict the products when 1-propanol is heated in the presence of an acid? There are two products. I have one of them 1-propene, what is the second product?
The result of heating 1-propanol with in absence of an acid is 1-propene. In two processes, 1-propene is created from 1-propanol.
What applications does propanol have?
It helps with anxiety, treats cardiac issues, and shields against migraines. Propranolol is a medication that can be used to manage high blood pressure when you have a heart condition. Treat diseases like atrial fibrillation that result in an irregular heartbeat (arrhythmia).
Is propanol poisonous?
Consuming 1-propanol can result in death, loss of consciousness, slowing breathing and heartbeat, and bewilderment. Exposure to the skin may result in allergic or inflammatory reactions. Children, adolescents, & adults who may consume contaminated products are at a high risk of formaldehyde or 1-propanol poisoning.
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The vapor pressures (in torr) of solid and liquid uranium hexafluoride are given by
ln(Ps)=24.513−5892.5 KTln(Ps)=24.513−5892.5 KT
ln(Pl)=17.357−3479 KTln(Pl)=17.357−3479 KT
where T is the absolute temperature. Calculate the temperature and pressure at the triple point of uranium hexafluoride.
T= _____ K
P=____torr
When T is the absolute temperature, then 5892.5 K In (Ps) = 24.513 3479 K ln (P) = 17.357 gives the vapor pressures (in torr) of solid and liquid uranium hexafluoride.
What is the purpose of uranium hexafluoride?Because of its special qualities, uranium hexafluoride is employed in the processing of uranium. It can be utilized easily as a liquid to fill or empty equipment or containers, or as a gas for processing.
Where does uranium hexafluoride come from?In the process of gaseous diffusion, mined uranium ore is delivered to a facility that turns it into uranium oxide, also referred to as "yellowcake." The next step is to chemically create uranium hexafluoride by combining uranium oxide with hydrogen fluoride and fluorine gas.
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which of the following statements best helps to explain why the contents of the tube containing the equilibrium mixture turned a lighter color when the tube was placed into an ice bath? (a) the forward reaction is exothermic. (b) the forward reaction is endothermic. (c) the ice bath lowered the activation energy. (d) the ice bath raised the activation energy.
The mixture as per the question is endothermic reaction when the contents of the tube containing the equilibrium mixture turned a lighter color whenever the tube was placed into an ice bath.
Activation energy can be defined as the minimum energy required by particles at the reactant side for a chemical reaction to occur. According to the reaction conditions, specifically for reversible reactions, reactants can in turn become products and vice versa.
Exothermic reaction can be defined as the process where the heat energy is liberated in the conversion of the reactants to products for the forward reaction. We know that the heat is created in this process a small part of the energy may be initially provided to activate the reactant particles but once the reaction is in ongoing state it produces good amount of heat energy to keep the process in flow.
The reverse reaction, we know that is the endothermic in nature. The heat energy is absorbed in the conversion of the products ( now reactants in the reverse reaction ) to reactants ( now products in the reverse reaction ), as a result of this more amount of energy has to be initially and continuously supplied for them to overcome the activation energy barrier for the reverse reaction to occur and be sustained.
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All of the following statements about lighteners are true EXCEPT:a) they are used at relatively high levelsb) they slowly block the production of melanin in the skinc) they are used to bleach or lighten areas of hyperpigmentationd) they usually take months of continued use to deliver a noticeable effect
With the exception of (a), all of the following statements regarding lighteners are true.
What causes hyperpigmentation?Melanin, a pigment made by skin cells, is what gives skin their colour. The skin cells may produce far to much melanin if they are sick or injured. There might be a melanin deposition there, darkening it up. Fading could take a while after the dark spots and patches' root causes have been identified and eliminated. An area that is just a few shades darker than you natural skin color takes 6 to 12 months to heal on average. Blue-gray-appearing hyperpigmentation in the dermis may last a long time or become permanent if addressed.
Which serum is best for hyperpigmentation?Lightweight Anti-Pigmentation Serum: Clinical studies have shown that the advanced skin-lightening ingredient Alpha Arbutin, which is included in this de pigmentation serum, reduces hyperpigmentation and blemishes.
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The work of expanding a gas. Compute the total work performed when expanding an ideal gas, at constant temperature, from volume V to 2V.
The total work performed is nRT * 0.693
The work done by an ideal gas during an expansion at a constant temperature from volume V to 2V can be calculated using the equation work = nRT * ln(Vf/Vi).
Where n is the number of moles of gas, R is the ideal gas constant, T is the temperature, Vf is the final volume and Vi is the initial volume.
In this case, the initial volume is V and the final volume is 2V, so
the work done is nRT * ln(2V/V).
Since ln(2) is equal to 0.693, the work done is nRT * 0.693. Keep in mind, this equation is only true for certain types of gas at specific temperatures and pressures.
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Which of these are consequences of an increase in long-run aggregate supply? Correct Answer(s) Drag appropriate answer(s) here an increase in the price level an increase in full-employment output an increase in short-run aggregate supply a decrease in the long-run rate of unemployment u*
Drag the proper The short run balance output and market price for the economy is where the collective supply line meets the money supply line.
What elements alter aggregate supply over the long term?elements , labor, and knowledge are the only variables that affect the aggregate supply curve over the long term. The graph may shift towards the right as a result of increased capital, more labour availability, and improved technology because it is vertical with in long run.
What happens when aggregate supply rises over the long term?Consumers battle for the available commodities and pay more when demand rises in the face of steady supply. Due to this dynamic, businesses boost output in an effort to increase sales. Prices normalize as a result of the increased supply, while output stays high.
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If the rate of consumption of magnesium is 5.0 × 10^-9 mol/s. find the rate of consumption of HCl in moles/s
In order to find the rate of consumption of HCl in moles/s, you would need to know the balanced equation for the chemical reaction involving magnesium and HCl.
One common reaction is the reaction between magnesium and hydrochloric acid:
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
If the rate of consumption of magnesium is 5.0 × 10^-9 mol/s, this means that 5.0 × 10^-9 moles of magnesium are being consumed per second. In this reaction, one mole of magnesium reacts with 2 moles of HCl, so for every mole of magnesium consumed, 2 moles of HCl are also consumed.
Therefore, the rate of consumption of HCl in moles/s can be calculated by multiplying the rate of consumption of magnesium by 2:
rate of consumption of HCl = (rate of consumption of Mg) * 2
rate of consumption of HCl = (5.0 x 10^-9 mol/s) * 2 = 1.0 x 10^-8 mol/s
So the rate of consumption of HCl in moles/s is 1.0 x 10^-8 moles/s.
a chemsit has a 70ml of 50% methane solution. how much of an 80% solution must she add to get a 60% solution
70 ml of 50% hydrocarbon solutions and 35 milliliter of 80% methane solutions must be combined.
Describe methane.Hydrocarbon methane (CH4) seems to be a main constituent of natural gas. Because methane is a contributor to global warming (GHG), its presence within the atmosphere has an impact on the planet's climate and temperature. There are many industrial (influenced by humans) and natural sources that release methane.
Where can you find methane?Large environmental sources of formaldehyde include termite digestion, emissions from waterways and oceans, and ocean currents. Agricultural output, landfills, raising of cattle and other animal animals (cow burps! ), and energy production are examples of sources that are related to activity.
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Part A
Enter the Ksp expression for A2B3(s) in terms of [A] and [B].
Part B
Enter the Ksp expression for AC4(s) in terms of [A] and [C].
Express your answer in terms of [A] and [C], for example, [X]*[Y]^2.
The Ksp expression for A2B3(s) in terms of [A] and [B] is Ksp, the Ksp Equation for the specified solid is Ksp = 4x3.
How is KSP determined?Ksp = [a] [b]2, where Ksp is the maximum amount of solute that can dissolve at equilibrium. If you make x=a, you know that b=2x because there is twice as much b as a. Molar solubility is merely another word for molarity. These values for both a and b in respect of x allow you to calculate Ksp as [x] [2x]2, which equals Ksp=4x3.
∠K=∠K [Common]
∴ △KNP∼△KML [By AA-criterion of similarity]⇒ KMKN =
ML
NP
[∵ Corresponding sides of similar triangles are proportional] ⇒ b+cc= ax⇒x= b+cac
KSP=[x] [2x]2:
What does it mean?You may make Ksp equal to [x] [2x]2 with all those values a and conversely in terms of x, which implies that Ksp equals [x] [4x]3.
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How many grams of lioh are needed to make 100 ml of a 0.1 m solution?
0.24 grams needed to make this solutions.
What is meant by grams?
The International System of Units (SI) defines the gram as one thousandth of a kilogram of mass.The term "absolute weight" was first used in a definition from 1795 that stated, "the absolute weight of a volume of pure water equal to the cube of a hundredth part of a metre [1 cm3], and at the temperature of melting ice." Later, the definition's defining temperature (0 °C) was changed to4 °C, the temperature at which water has its maximum density.
By the late 19th century, however, there was a push to make the kilogram the base unit and the gram a derived unit.A gram was defined as one thousandth of a kilogram by the new International System of Units in 1960.Volume = 100 ml
Molarity (M) = 0.1M
Molecular weight of LiOH => 7 + 16 + 1= 24
Formula here we use is :- 1 × 1000 / 24 × 100
w = 0.24g
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it is not possible to determine exactly when a particular unstable isotope will begin to decay. truefalse
The statement "It is not possible to determine exactly when a particularly unstable isotope will begin to decay" is true.
An isotope is a type of atom that possess different numbers of neutrons and protons. Depending on the excess or lack of neutrons, isotopes can be heavier or lighter.
Because most of the isotopes are unstable they mostly do not occur in nature. Isotopes are said to be stable if they do occur in nature. However, some unstable isotopes, such as Bismuth-209, are found in nature due to their long life span which can cover millions of years or more.
either more or fewer neutrons than protons are there in an unstable isotope. Unstable isotopes do not occur in nature for long periods because they eventually break up.
They emit energy in the form of electromagnetic waves or charged particles when they occur for a longer period in nature. The energy or particles released are called radiation.
They take either millions of years to break up or others just seconds. The isotopes which are more commonly found in heavy elements are unstable.
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I'm begging just help me if you know the answer:
how does the temperature affect on concentration (liquid) of NaOH (sodium hydroxide?
Answer:
The solubility of sodium hydroxide decreases with increase of temperature. Equilibrium constant of an exothermic reaction decreases with increase of temperature. Due to this less heat is produced in the reaction and the effect of increased temperature is nullified.
