Wednesday
August 5, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry Subatomic particles
What data led to the need for change in Daltons ideas?
Monday, June 29, 2015 by Anonymous

Chemistry Subatomic particles
Fill in the chart (Numbers correspond to each other[I.E 1 in 1st group connects with 1in 2nd]) Subatomic particle found 1.Proton 2.Neutron 3.Electron Scientist 1.Rutherford 2.Chadwick 3.Thomson Experiment 1.Gold Foil Experiment? 2.? 3.Cathode Ray Tube Data Supporting Discovery...
Monday, June 29, 2015 by Joey

Organic Chemistry
Please help! Thank you! Alcohols can act either as weak acids or as weak bases, just as water can. Show the reaction of methyl alcohol, CH3OH, with a strong base such as Na+ -NH2
Monday, June 29, 2015 by Anonymous

Chemistry
How come lead is denser than copper though more copper atoms can fit into a same size cube than lead atoms can?
Monday, June 29, 2015 by Joey

Chemistry
When heated to 350. ∘C at 0.950 atm, ammonium nitrate decomposes to produce nitrogen, water, and oxygen gases: 2NH4NO3(s)→Δ2N2(g)+4H2O(g)+O2​(g) Using the ideal gas law equation, calculate the volume, in liters, of water vapor produced when 21.8 g of ...
Monday, June 29, 2015 by Telimm

Chemistry
Copper and lead had different densities. Sketch a diagram at the particular nature of matter level showing the atoms of a small cross section of copper and lead. Use this diagram to explain why lead is denser than copper. I couldn't find any pictures or see anywhere in my ...
Monday, June 29, 2015 by Anonymous

Chemistry
472 mL of H2 was collected over water when 1.256g Zn reacted with excess HCl. The atmospheric pressure during the experiment was 754 mmHg and the temp was 26C. What is the pressure in atm of the dry hydrogen gas in the mixture. I don't know how to answer this.
Monday, June 29, 2015 by Stan

Chemistry
What volume of 0.5M NaOH must be added to 50mL of .0.1M benzoic acid to make 100.0 mL of 0.05 M benzoate buffer that is pH 4.5?
Monday, June 29, 2015 by Kathys

Chemistry
If the mole fraction of ethanol in aquas solution is 0.05 . Calculate morality of solution ? Explain it's.
Monday, June 29, 2015 by Awadhesh kumar

Chemistry
What volume of 0.5M NaOH must be added to 50mL of .0.1M benzoic acid to make 100.0 mL of 0.05 M benzoate buffer that is pH 4.5?
Monday, June 29, 2015 by Kathy

Chemistry
Consider the reaction: 2Mg + O2 ------> 2MgO The reaction is at equilibrium, the concentration of MgO is found to be 0.5. What is the concentration of Mg and O2? ----------------------------------------​--------------- Keq is not given... using the ICE table, I ended ...
Monday, June 29, 2015 by Annie

Chemistry
Consider the reaction: 2Mg + O2 ------> 2MgO The reaction is at equilibrium, the concentration of MgO is found to be 0.5. What is the concentration of Mg and O2? ----------------------------------------​--------------- Keq is not given... using the ICE table, I ended ...
Monday, June 29, 2015 by Annie

chemistry
10.5 g sample of copper metal at 25.0°C is heated by the addition of 150.0 J of energy. The final temperature of the copper is _____°C. The specific heat capacity of copper is 0.38 J/ goC.
Monday, June 29, 2015 by jennifer

Chemistry
What data led to the development of the Law of Multiple Proportions? Give an example and explain why this law is important in chemistry. Would this be a good answer: John Dalton used the same observations he used for his law of definite proportions to help develop the law of ...
Sunday, June 28, 2015 by Jack

Chemistry
Why aren't the properties of sodium chloride the same as the elements that compose it?
Sunday, June 28, 2015 by Jill

chemistry
In the reaction of sodium metal with chlorine gas to form sodium chloride, how does chlorine form an anion? Write an equation to support your answer. I know that chlorine becomes an anion since it's gaining an electron from sodium, but how do I show that in an equation?
Sunday, June 28, 2015 by Anonymous

chemistry
correct the following examples of gasses to standard temperature. (assume pressure is constant)(STP stands for standard temp and pressure which is 273K and 101kPa, you do no have to think about the pressure for these four but on the last three you will have to so T2 is 273K ...
Sunday, June 28, 2015 by Anonymous

chemistry
A compound is found to contain 15.12 % phosphorus, 6.841 % nitrogen, and 78.03 % bromine by weight. what is the emperical formula
Sunday, June 28, 2015 by Jeremy

general chemistry
P in PCl5 has a trigonal planar right? Cl2=P=Cl2 | Cl1 is it right? help me how to determine the angle
Sunday, June 28, 2015 by faye

chemistry
If 5.40 kcal of heat is added to 1.00 kg of water at 100 degrees celsius, how much steam at 100 degrees celsius is produced?
Sunday, June 28, 2015 by olaf

organic chemistry
whats the difference between inorganic chem and organic chem? im really confuse because mrs. white told us inoraganic is about ionic bonds while organic is about covalent bond. what is the difference between the twooo? please help me
Saturday, June 27, 2015 by ella

Chemistry Stoichiometry
The density of chloroform at a pressure of 220 mmHg and 25 degrees celsius is 1.42 g/L. Calculate the molar mass of chloroform. My set up is: mol*K .289 atm 1 1.42g/L ------------- ------------ ------ --------- .08206Latm 1 298K What I am unsure of is if this is the right way ...
Saturday, June 27, 2015 by Jack

Chemistry
If 100.0 mL of 0.150 M sodium nitrate is added to 50.0 mL of 0.150 M sodium carbonate, what is the resulting molar concentration of the sodium ion?
Friday, June 26, 2015 by John

Chemistry
How would I find the pH of these? I found it for d and e, but I don't know how to do the rest a) 0.25M carbonic acid b) 0.075M CN- c) 0.15M F- d) 0.015M HCl (I got 1.8) e) 0.015 M NaOH (I got 12) f) 0.050 M acetic acid
Thursday, June 25, 2015 by Sara

chemistry
How to distinguish between an acid and an alkali. DO not use indicators
Wednesday, June 24, 2015 by Clive

Chemistry
You may have noticed that when water boils, you can see bubbles that rise to the surface of the water. a. What is inside these bubbles? i. air ii. hydrogen and oxygen gas iii. oxygen gas iv. water gas v. carbon dioxide gas
Wednesday, June 24, 2015 by Anonymous

Chemistry
PCl5 is introduced into an evacuated chamber and comes to equilibrium (see Problem 16.37), at 250◦C and 2.00 atm. The equilibrium gas contains 40.7% Cl2 by volume. (a1) What are the partial pressures of the gaseous components at equilibrium? (a2) From these data, ...
Wednesday, June 24, 2015 by Joe johnson

Chemistry
My question is I need to change to symbol on sodium ion, \rm Na^+, followed by the formula of a sulfate ion, \rm SO_4{}^{2-} Its my first time in chemistry class.
Wednesday, June 24, 2015 by Zulema

Chemistry
You have two beakers, one filled to the 100 mL mark with sugar (mass of sugar 180.0 g) and the other filled to the 100 mL mark with water (m ass of water 100.0 g). You pour all the sugar and all the water together in a bigger beaker and stir until the sugar is completely ...
Wednesday, June 24, 2015 by Kristina

Chemistry
A solution contains 0.284 M sodium nitrite and 0.257 M nitrous acid. What is the pH of the solution?
Wednesday, June 24, 2015 by Glenna

Chemistry
How energy is needed to vaporize 100 g of ethanol from its boiling point?
Wednesday, June 24, 2015 by Joseph

Chemistry
Determine the molar solubility of Y for XY2 if Ksp is 2.2x10^-4 The answer is 0.038, but I'm not sure how
Wednesday, June 24, 2015 by Sara

Chemistry
Enter the symbol of a sodium ion, \rm Na^+, followed by the formula of a sulfate ion, \rm SO_4{}^{2-}
Wednesday, June 24, 2015 by Zulema

Chemistry
Electron configuration for phosphorus is 1s2 2s2 2p6 3s2 3p3. So the number of electron must be 15 , right ? But , what if m = 1 ? Does it effect the number of electron ?
Tuesday, June 23, 2015 by Lily

Chemistry
How mush CaCl2, in grams, is needed to make 2.0 L of a 3.5M solution? g CaCl2 = (2.0L) *( 3.5 mol Cl-/1L) * (1mol CaCl2/ 2mol Cl-) *( 110.98 g CaCl2/ 1 mol CaCl2) = 5.549 g CaCl2 i don't think i did any of this right
Tuesday, June 23, 2015 by Sydney

Chemistry
For this question, I know how to answer the first three questions, but not the rest. 12ml 0.025 M of benzoic acid (Ka=6.3x10-5)is titrated with 0.050 M NaOH. How many moles of benzoic acid are there? I got 0.0003 What volume of NaOH is required?(L) I got 0.006 What is the ...
Tuesday, June 23, 2015 by Sara

chemistry
find the numbers of elerctorins in 18ml water
Tuesday, June 23, 2015 by nikita bhukar

Chemistry
I have this question as a review question: The reaction N2(g)+3H2(g)<-->2NH3(g) begins with 1.15 M N2 and 1.36 M H2. At equilibrium, the concentration of NH3 is 0.78 M. Determine the extent of reaction. The answer is supposed to be 86 but I don't know how
Tuesday, June 23, 2015 by Sara

chemistry
. A student added 40.0 mL of an NaOH solution to 90.0 mL of 0.400 M HCl. The solution was then treated with an excess of nickel(II) nitrate, resulting in the formation of 1.06 g of Ni(OH)2 precipitate. Determine the concentration of the original NaOH solution.
Tuesday, June 23, 2015 by abdulaziz

chemistry
. A student added 40.0 mL of an NaOH solution to 90.0 mL of 0.400 M HCl. The solution was then treated with an excess of nickel(II) nitrate, resulting in the formation of 1.06 g of Ni(OH)2 precipitate. Determine the concentration of the original NaOH solution.
Tuesday, June 23, 2015 by abdulaziz

Chemistry
Calculate the molarity of a solution made by adding 33.4 mL of concentrated nitric acid (70.4 % by mass, density 1.42 g/mL) to some water in a volumetric flask, then adding water to the mark to make exactly 2000 mL of solution. (It is important to add concentrated acid or base...
Tuesday, June 23, 2015 by JO

college chemistry
When a solution containing 8.00 g NaOH in 50.0 g of water at 25 °C is added to a solution of 8.00 g of HCl in 250.0 g of water at 25 °C in a calorimeter, the temperature of the solution increases to 33.5 °C. Assuming that the specific heat heat of the solution is ...
Tuesday, June 23, 2015 by Karla

chemistry
find the valuv of element X wich atomic wait is 6.664.10-23 and it's 40kg atoms number
Monday, June 22, 2015 by nikita bhukar

chemistry
NUMBER of electorn in 18ml water (solidity is 1gm/ml)
Monday, June 22, 2015 by nikita bhukar

Organic Chemistry
1. Which of the following bonds is the strongest? a. F-F b. F-Cl c. F-Br d. F-I I think it's A because of the same atomic radius. Is that correct? Am I on the right track?
Monday, June 22, 2015 by Michelle

chemistry
*.How many grams of KCl would you need to add to 2 liters of water to make a .50 M solution?
Sunday, June 21, 2015 by tApAsh

Chemistry
A 1.50 L buffer solution is 0.250 mol L-1 in HF and 0.250 mol L-1 in NaF. Calculate the pH of the solution after the addition of 0.0500 moles of solid NaOH. Assume no volume change upon the addition of the base. The Ka for HF is 3.5 × 10-4. Thanks in advance!
Sunday, June 21, 2015 by B

Chemistry
How many grams of (Bef2) are present in 655ml of a 0.442 M solution of (BeF2) Please help
Sunday, June 21, 2015 by Ocean

Chemistry
What is the molarity of a solution that contains 2.17 moles of (SrCl2) in 2,660ml of solution? I know that the formula is molarity=moles/liters Liters=.2660
Sunday, June 21, 2015 by Ocean

Chemistry
How many grams of Fe(NO3)2 are present in 555mL of a 0.650 M solution of Fe(NO3)2?? I have no clue what to do??
Sunday, June 21, 2015 by Ocean

Chemistry
What mass of water has 6.70 x10^23 molecules? I keep getting 2.005e47 On my calculator but the answer key says 20 g . 6.70x10^23 molecuels *1 mol/6.02x10^23*18.02 g H2O /1 mol That's how I set it up.
Sunday, June 21, 2015 by sakura

Chemistry
What is the pH of a 0.40 mol L^-1 H2Se solution that has the stepwise dissociation constants Ka1 = 1.3 × 10^-4 and Ka2 = 1.0 x 10^-11 ? Thanks in advance
Sunday, June 21, 2015 by Elaina

Chemistry
How many grams of Fe(NO3)2 are present in 555mL of a 0.650 M solution of Fe(NO3)2?? I have no clue what to do??
Sunday, June 21, 2015 by Ocean

Chemistry
Baking soda consists mostly of a single chemical. Look up what it is, its molecular weight and density, and determine the number of moles used in this recipe. Give your answer in moles but do not include the units.
Saturday, June 20, 2015 by Diana Merritt

Dilsuknagar public school chemistry
Calculate the mass ,volume and number of molecules of hydrogen liberated when 198grams of zinc reacts with hydrochloric acid?
Saturday, June 20, 2015 by meghansh

Chemistry
The emission of high energy particles from the nucleus of an atom is called A. radioactivity B. electromagnetism C. transmutation D. radioactive dating I said A. as my answer. The definition of radioactivity is worded differently in my book though so I wanted to check if my ...
Saturday, June 20, 2015 by Neena

chemistry
a 2.00g sample of zinc metal is added to a calorimeter containing 150g of nitric acid solution initially at 20.0 degrees celsius . The temperature of the solution increased to 28.0 degrees celsius . Calculate the delta H of the reaction assuming that the specific heat capacity...
Saturday, June 20, 2015 by sami

chemistry
what concentration of nitrogen should be present in a glass of water at room temperature? assume a temperature of 29°C a total pressure of 1 atm
Saturday, June 20, 2015 by ashmit

chemistry
A sample of gas has an initial volume of 20.9 L at a pressure of 1.4 atm If the sample is compressed to a volume of 12.9 L: , what will its pressure be? (Assume constant temperature.) Thank you
Thursday, June 18, 2015 by ap

Chemistry
Ethanol is the active ingredient of alcoholic beverages. It is also s a possible replacement for gasoline. The complete combustion of ethanol forms carbon dioxide and water. CH3CH2OH + O2 => CO2 + H2O Balance the equation. What mass of carbon dioxide is formed by the ...
Thursday, June 18, 2015 by Priscilla

Chemistry
PLS HELP ME(1)Write a balanced equation in each case dilute hydrochloric reacts with[i]ZnCO3[ii]CuCO3 (2)Discuss how hydrocarbons contribute to the formation of ozone in the atmosphere.I'M CONFUSED I NEED HELP!
Thursday, June 18, 2015 by Anonymous

Chemistry
(1)Write a balanced equation in each case dilute htdrochloric reacts with[i]ZnCO3[ii]CuCO3 (2)Discuss how hydrocarbons contribute to the formation of ozone in the atmosphere
Thursday, June 18, 2015 by Tazannia Tennyson

chemistry
Imagine that you have an ideal gas in a 4.80L container, and that 2450 molecules of this gas collide with a square-inch area of the container at any given instant. If the volume is increased to 19.2L at constant temperature, how many collisions will occur per square inch of ...
Wednesday, June 17, 2015 by Alicia Estrada

Chemistry
Showing all calculations and specific references to the equipment needed, describe how to prepare 500mL 0.250mol/L potassium iodide(KI) solution.
Wednesday, June 17, 2015 by Robyn

Chemistry
A solution containing excess lead(ii) nitrate is reacted with 380.0ML of 0.250mol/L potassium iodide solution. A bright yellow Precipitate is of lead(ii) iodide is formed. Calculate the mass of lead (ii) iodide that should be formed. Pb(NO3)2+2KI-> 2KNO3+PbI2
Wednesday, June 17, 2015 by Robyn

physical science chemistry
If 25 cm^3 of the potassium hydroxide (KOH) solution was used to neutralise 35cm^3 hydrochloric (HCl)solution, determine the concentration of the hydrochloric acid solution. Thanks
Wednesday, June 17, 2015 by jonathan

science chemistry
Brandon prepares a potassium hydroxide solution (KOH) that he uses during a titration to determine the unknown concentration of a hydrochloric acid solution calculate the mass of potassium hydroxide that is need to prepare 250 cm^3 of a standard 0,125 mol.dm^-3 KOH solution.
Wednesday, June 17, 2015 by dennis

chemistry
the reaction contains initially 5 moles of CO and 2 moles of H2O.the volume is 1 litre.but at equilibrium it is 0.5 moles of h2o .then value of Kc for reaction is.
Wednesday, June 17, 2015 by khushbo

Chemistry
Guys. I have another chemistry question that I am unsure with. I would appreciate it if you could help me with working out. Thanks. A sample of ethane, C2H6, contains 9.6 * 10 ^ 22 atoms. How many mole of ethane is present in the sample? Why do I need to divide (9.6*10^22) by ...
Wednesday, June 17, 2015 by Mole help!

Chemistry
Hi guys. I cannot figure out how to do this question. Can you please do all the working out. Thanks How many moles of Al atoms are needed to combine with 1.58 mol of O atoms to make aluminum oxide, Al2O3?
Wednesday, June 17, 2015 by Gursimran

chemistry
What is the amount of water produced when 2gram of hydrogen is ignited with 8gram of oxygen
Wednesday, June 17, 2015 by Xaim

chemistry
The amount of carbon which when completely burnt in air,produces 100gram of carbon dioxide by weight is
Wednesday, June 17, 2015 by Xaim

chemistry
Which of the following numbers is most significant (a)2000 (b)2.00033 (c)6.67×10 (d)0.000122
Wednesday, June 17, 2015 by Xaim

chemistry
The total number of water molecules in 36gram of water is
Wednesday, June 17, 2015 by Xaim

Chemistry
I have know clue how to answer this, but I tried something.(predicting products of electrolysis in aqueous solution)/ Predict the products of the electrolysis of a solution of aqueous MnSO4. I first wrote this: Mn^2+ SO4^2- Then for Mn^2+, it can be reduced to Mg(s) -2.36V and...
Tuesday, June 16, 2015 by Sara

Chemistry
Use each equation to predict whether the relative entropy change is S(products) > S(reactants) or S(products) < S(reactants) and whether ΔS > 0 or ΔS < 0 for the chemical reaction represented. Justify your answer in each case. a. 2NH3(g)&...
Tuesday, June 16, 2015 by Madison

college chemistry
Calculate the molarity (M) of 156.2g of H2SO4 in 1.275L of solution.
Tuesday, June 16, 2015 by Alicia Estrada

chemistry
A lactic acid/lactate ion buffer solution contains 0.43M HC3H5O3 and 0.90M C3H5O3-. The value of lactic acid is 1.4*10-4 calculate the pH of this buffer
Tuesday, June 16, 2015 by jennifer

Chemistry
Calculate the mass percent of a NaCl solution in which 158g of NaCl is dissolved in 3.81L of water at 25 ∘C (density = 0.997 g/mL).
Tuesday, June 16, 2015 by Alicia Estrada

Chemistry.
Predict these reaction products. If a reaction takes place, balance the reaction if needed. If no reaction takes place then write no reaction. Cu+FeCl3--->CuCl3 + Fe Double replacement Al+HBr----> AgNO3 + KCL--->AgClKnO3 Double replacement Ba(NO3)2+MgSO4---->BaSO4(...
Tuesday, June 16, 2015 by Jessy

Chemistry
Consider the NiCd (nickle cadmium) cell found in rechargeable batteries. 1.)Which element is the cathode when the cell is recharging (being electrolytic)? 2.)How many cells must be present to produce 1.2 V 3.)Which element is the anode when the cell is discharging (being ...
Tuesday, June 16, 2015 by Sara

Chemistry
Predict the products of the electrolysis of a solution of aqueous MnSO4 given the following choices: a. H2SO3 (aq) b. O2 (g) c. H2 (g) d. OH- (aq) e. Mn (s) f. e- g. H+ (aq) how is the answer O2 and H2SO3?
Tuesday, June 16, 2015 by Sara

chemistry
How many equivalents of an acid or base are in the following? 0.43mol Mg(OH)2 and 2.8g Mg(OH)2?
Tuesday, June 16, 2015 by jennifer

chemistry
What volume of 0.076M HNO3 is required to titrate 20.0ML of 0.25M Ba(OH)2 solution? use 2 sig figures
Tuesday, June 16, 2015 by jennifer

chemistry
The mechanism of solubility depends on the solute and solvent. Describe on an ionic or molecular scale how each of the following dissolve: a.NaCl in H2O b.I2 in CCl4 c.CH3CH2OH in H2O
Tuesday, June 16, 2015 by Lisa

chemistry
The ksp for Al(OH)3 is 3.7*-5 at 20 degrees. What is the solubility of Al(OH)3 in grams per litre?
Tuesday, June 16, 2015 by Lisa

chemistry
The concentration of Mg2+ ion in a solution is 0.010M. At what pH will Mg(OH)2 first precipitate? (Given Ksp Mg(OH)2 equals 1.2*10-11)
Tuesday, June 16, 2015 by Lisa

chemistry
Ksp fo CaSO4 is 6.1*10?-5. how many grams of CaCl2 must be added to 500ml of 0.010M H2SO4 to just start preciptation of CaSO4? I cant figure this out at all.
Tuesday, June 16, 2015 by Samantha

Chemistry
Equilibrium constants at 25 ∘C are Substance Kc Value of Kc CaCO3 Ksp 4.5×10−9 H2CO3 Ka1 4.3×10−7 Ka2 5.6×10−11 What is the molar solubility of marble (i.e., [Ca2+] in a saturated solution) in acid rainwater, for which pH=4.20?
Tuesday, June 16, 2015 by Samantha

chemistry
The molar volume of an ideal gas is
Tuesday, June 16, 2015 by Xaim

Chemistry
Item 1 Maleic acid is a carbon-hydrogen-oxygen compound used in dyeing and finishing fabrics and as a preservative of oils and fats. •In a combustion analysis, a 1.054-g sample of maleic acid yields 1.599 g of CO2 and 0.327 g of H2O. •When 0.609 g of maleic acid is ...
Tuesday, June 16, 2015 by Samantha

Chemistry
What is the pH change of a 0.220M solution of citric acid (pKa=4.77) if citrate is added to a concentration of 0.155M with no change in volume?
Tuesday, June 16, 2015 by Samantha

analytical chemistry
a buffer solution is 0.2M in acetic acid and in sodium acetate. Calculate the change in pH upon adding 1.0ml of 0.1M hydrochloric acid to 10ml of this solution.(Given pKA of acetic acid is 4.76)
Tuesday, June 16, 2015 by woo

analytical chemistry
a 0.4617g sample containing sodium bicarbonate was dissolved and titrated with standard 0.106M of hydrochloric acid solution , requiring 40.72ml. the reaction is: HCO3- + H+ -> H2O + CO2 Calculate the percent sodium bicarbonate in the sample. (Given molecular weight of ...
Tuesday, June 16, 2015 by zzz

Organic Chemistry
Which isomer of 1-ethyl-3-methylcyclohexane is more stable, cis or trans? My teacher hasn't covered this material as of yet, but we have a test done tomorrow on it. What is a cis and trans? Not sure how to begin figuring this out. My text book isn't helpful. Thanks
Monday, June 15, 2015 by Michelle

Chemistry
Balance TeO3^3- + N2O4 --> Te +NO3^- using oxidation numbers
Monday, June 15, 2015 by Sara

chemistry
1. Unless otherwise instructed, you may use the periodic table in the Chemistry: Problems and Solutions book for this test. You also may use the formulas on pages 238 243. A student increases the temperature of a 556 cm3 balloon from 278 K to 308 K. Assuming constant pressure...
Monday, June 15, 2015 by tony

chemistry
If 32.9mL of 0.170M BaCl2 are needed to react completely with 35.0mL of 0.160M Na2SO4 . How many grams of BaSO4 will be formed?
Monday, June 15, 2015 by jennifer

chemistry
If the theoretical yield of a reaction is 0.173g and the actual yield is 0.165g , what is the percent yield?
Monday, June 15, 2015 by dj

chemistry
How can i Fill in the missing words Ionisation energy, water, melting point, electronegativity, non-polar, solvent, pair, boiling points, polar A covalent bond is formed when a 1________ of electrons is shared between the bonding atoms.when the electrons are shared equally,a ...
Monday, June 15, 2015 by dennis

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