CHEMISTRY (WEBWORK)

58,662 results, page 85

Chemistry

5. The elements are related by properties in groups.- F? 7. In Earth's environment, hydrogen is a metal.- T? Thanks -MC

Chemistry

What is the dominant intermolecular forces for C2H5OC2H5 (diethyl ether)? Is it dispersion and polar?

chemistry

calculate the work done when 50.0g of tin dissolves in excess acid at 1.00 atm and 25 degrees c.

Chemistry

Calculate the [H3O+] of the following polyprotic acid solution: 0.145 M H3C6H5O3?

chemistry

Calculate the [H3O+] of the following polyprotic acid solution: 0.145 M H3C6H5O3?

chemistry

How many grams of calcium nitrate, Ca(NO3)2, are needed to make 100 mL of a .5 M solution?

chemistry

a 25.0 sample of nitrogen has a volume of 50.0L and a pressure of 630. mmHg. what is the temperature of the gas?

Chemistry

Concentration of OH- left in a solution made by mixing 16.0 g of NaOH and 80.0 mL of 0.170M HNO3?

Chemistry

The Ka values of H2CO3 are shown below. Ka1 4.6 10-7 Ka2 4.4 10-11 What is the pH of a 0.17 M solution of Na2CO3?

chemistry

How many grams of potassium fluoride are needed to make 250 mL of a 0.31 M solution in water?

chemistry

How many grams of potassium fluoride are needed to make 250 mL of a 0.31 M solution in water?

lab questions (chemistry)

why must not the condensed water drip into the flask?

Chemistry

Can anyone tell me why the answer that I got here is not correct? Pb(s) + AgNO3(aq) yields Ag(s) + PbNO3(s)

Chemistry

How many electrons in an atom can have each of the following quantum number or sublevel designations? 1. n = 4, l = 3

chemistry

How many moles of electron are transferred per mole of this reaction? 6Li + N2-> @Li3N

chemistry

What is the volume of 3.5 moles of oxygen gas (O2) at standard temperature and pressure (STP)

chemistry

What is the volume of 3.5 moles of oxygen gas (O2) at standard temperature and pressure (STP)? 6.4 L 22.4 L 32.0 L 78.4 L

chemistry

if 3.ooml of cyclohexanol were used in the dehydration reaction, what is the theoretical yield of cyclohexene?

Chemistry

Write the equilibrium constant expression for the reaction: 2NO +2H2 =N2+2H2O Kc=?

chemistry

how many moles of butane gas c4h10 react to produce 3.50moles of water?

Chemistry

The only strongly electropositive metal that will not form a saline hydride is what element?

Chemistry

What is the chemical cause of the greens and red colors of aurora borealis (the northern lights)?

chemistry

21.00 mL of 0.200 M HBr is titrated with 0.351 M NaOH. What is the pH after the addition of 6.56 mL of the base ?

Chemistry

What is the mass of 1.665 x 10 to the 22nd formula units of calcium acetate,Ca(C2H3O2)2?

college chemistry

What is the pH of the solution obtained by diluting 500 mL of 0.0200 M NH3 (aq) to 1.000 L ?

Chemistry

What is the structure of SN? I thought .:S=N:: or ::S=N:. but both were deemed wrong by the homework software we have... help!

Chemistry

How many liters of CO2 would be produced if 32 grams of CH4 are combined with oxygen?

chemistry

Which halogen can form only one oxidation state other than zero?

Chemistry

Explain how shielding contributes to the atomic radius trend within a group.

Chemistry

calculate the number of formula units of 0.0067 g of lithium carbonate, Li2CO3?

Chemistry

What is the molecular ratio of the following equation? HNO3 + KOH = H2O + KNO3

chemistry

How many grams of H2(g)can theoretically be produced from a 5-g sample of magnesium metal and excess HC1(aq)?

Chemistry 111

Whatis the gas produced when you add NaHCO3 to methyl salicylate?

chemistry

Calculate the ionization constant, Ka, of phenol (HC6H5O), a weak acid, if a 0.25 M solution of it has a pH of 5.24.

Memorial university,chemistry

What is the total number of sigma and pi bonds in the molecule {CH}_3{NCO}?

Chemistry

You mix HCl with Na2CO3; the result is not exactly a precipitation, but it is related. Explain.

Chemistry 110

How many grams of Au2S can be obtained from 1017 mol of Au? The answer is 249. How did they get that?

chemistry

how do I calculate what temperature is needed to heat 52 grams of ethane to occupy 1200ml?

Chemistry

How much heat is given off by melting 155 grams of water?

chemistry

The following reaction consumes 2.40 kg of CO, How many total liters of gas are formed at STP?

chemistry

25.5g C7H11NO7S (4-nitro-2-toluenesulfonoic acid dihydrate) in 1.00*10^2g H2O (nonionizing solute)

organic chemistry

Propose a mechanism for the acid catalyzed dehydration of 1,1-dimethyl propanal

organic chemistry

what product would you expect to obtain from addition of Cl2 to 1,2-dimethylcyclohexene?

Chemistry 122

What is the pH of a solution obtained by dissolving 0.325 g of acetylsalicylic acid, in 0.5 L of water? With a Ka of 3.3 x 10 ^-4.

chemistry

Calculate the molar solubility of MX2, if the Ksp=3.3x10^-8 how can i solve this problem?

chemistry

Calculate the molar solubility of MX2, if the Ksp=3.3x10^-8 how can i solve this problem?

Chemistry

I posted a question at 5:43pm yesterday...can anyone please help with at least some of it? Thank you so much.

chemistry

3.49g of ammonia at STP weighs 4.48litre calculate molecular mass of it.

chemistry

How does electron configuration of ions derived from representative elements give them stability?

Chemistry

Which of the following electron configurations is not consistent with Hund's rule? 1) 1s^2 2s^2 2p^2 3s^1 2) 1s^2 2s^2 2p^6 3s^2 3p^5 3) 1s^2 2s^2 2p^6 3s^3 3p^6 4) 1s^2 2s^2 2px^2 2py^1

Chemistry

A solution that has an osmotic pressure greater than that of red blood cells is called?

Chemistry

Which of the following electron configurations is not consistent with Hund's rule? 1) 1s^2 2s^2 2p^2 3s^1 2) 1s^2 2s^2 2p^6 3s^2 3p^5 3) 1s^2 2s^2 2p^6 3s^3 3p^6 4) 1s^2 2s^2 2px^2 2py^1

chemistry

Your task is to produce 175mL of carbon dioxide. You many use anything in class.

Chemistry

Calculate the concentration of the solution in mass percent: 32.3 mg KNO3 in 2.44g of H2O.

Chemistry

In the determination of melting points, why cant you use water instead of mineral oil?

Chemistry

the bond between which pair of elements is the least ionic in character ? (1) H-F (2)H-Cl (3) H-I (4) H-O please help

chemistry

what is the molarity of an unknown HCI concentration if it requires 75ml of a 0.2 M NaOH solution?

Chemistry

Explain why CH2ClBr and CH2Cl2 do not have optical, geometric, or structural isomers?

chemistry

how do i do this: give the number of protons, electrons, and neutrons in each of the following atoms. 108 47 Au 40 20 Ca 23 11 Na

chemistry

If you have a 29.6 mass percent KCl in benzene,what is the new boiling point?

Chemistry

Calculate the enthalpy change per gram for the combustion of ethane (C2H6(g)).

chemistry

Predict the products of the chemical reaction aluminum + iron(III) oxide

chemistry

How many grams of methane gas were used to fill a baloon to a volume of 3.0 L at STP?

Chemistry

What is the geometry of XeF4? 1)tetrahedral 2)square planar 3)octahedral 4)seesaw 5)bent

Chemistry

From the lewis structure of AlCl4- where should I place the formal charge? next to Al or Cl?

Chemistry Lab Math

Prepare 600mL of a 100mM solution of glucose in 0.9% NaCl.

chemistry

How much 2.5mM solution of NaCl can be made from 30g of this pure salt?

chemistry

What is the solubility in moles/liter for copper(I) chloride at 25 oC given a Ksp value of 1 x 10-6

Chemistry

What is the theoretical justifaction for the order of reaction rates of a cycloalkane, cycloalkene, and benzene?

College Chemistry

A 50.0 mL sample of 6.0 M HCL is dulited to 200.0 mL. What is the new concentration of the acid?

chemistry

Write the 12 mole ratios that can be derived from the equation for the combustion of isopropyl alcohol?

Chemistry

Which compound would be ionic? H2O, CO2, SrCl2,SO2, H2S

Chemistry!

What is theoretical yield when 15.6g of bromobenzene & 8.3g of methyl benzoate is used in a Grignard reaction.

Chemistry

The pH of a buffer prepared from .30M H2X2O4 and .15M Na2C2O4(Ka of H2C2o4 is 5.6x10^-2

chemistry(help please)

Which acid,if it reacts in tincture of NaOH forms sodium hypochlorite?

chemistry

If 150 g of water are heated from 20.ºC to 30. ºC,the nunber of joules of heat energy absored is

Chemistry

how many moles of water are contained in 0.250 mile of CuSO4 * 5H2O? please help me

Chemistry

the mass of 4 moles of Co2 is ? (1)22g (2)44g (3)88g (4)176g please help !

chemistry

The molecular weight of H2SO4 is 98. The amount of the acid present in 400ml of 0.1M solution

Chemistry

Balance the Following Equations. _MgSo3+_HNO3->_Mg(NO3)2+_H2SO3

Chemistry

Compounds can be classified as acids or bases according to _____ different theories.

Chemistry

We are always told to use freshly prepared potassium iodide (KI) for titrations. Why?

chemistry

if you react magnesium solution and lead powder together is there a temperature change?

chemistry

what volume of 1.5M NaOH would be required to neutralize 0.65g of pure aspirin?

Chemistry

Chemical equation of: 1.Digesting of food 2.Fermentation of Wine 3.Burning of fuel

chemistry

Does Kv2SOv4, Kv2COv3 or KCv2Hv3Ov2 create the greatest increase in pH when mixed with water?

chemistry

what is the concentration of NaCl if 10 grams are dissolved in enough water to make 12 liters?

chemistry

How many grams of: 1.MgO 2.Cas would be produced if I had 3.8 moles of CaO

Chemistry

How much heat is evolved when 6.688 moles of Cu(s) is burned in excess oxygen

ap chemistry

What minimum volume of .2M Na2CO3 is needed to precipitate all the Sr 2+ from 25mL of .1M Sr(NO3)2

Chemistry

What is the density(g/L) of a gas mixture that contains 27.0% Fe and 73.0% He by volume at 714 mm Hg and 27.5 degrees Centigrade?

chemistry

Rank gases from highest average molecular speed to lowest Ne, HBr, CO

chemistry

how much lithium hydroxide will be needed to remove 75.0 grams of carbon dioxide?

chemistry

Calculate the "exact" alkalinity of a water that contains 0.6580 mg/L of bicarbonate, as the ion, at a pH of 5.66.

chemistry

What substance could be used to test if a sample of petrol contains any water as an impurity?

Chemistry 1200

0.238 M glucose (C6H12O6) in water (Assume the density of the solution is 1.00 g/mL.)

chemistry

when should the temperature be recorded for an experiment in order to determine the boiling point?

Chemistry

how could the amount of oxygen change the results in the synthesis of Magnesium oxide lab?

chemistry

Predict the empirical formula of the compound formed by each of the following pairs of elements.a) Li,S b) Na,H c) Al,l d) Ca,O

Chemistry

what would be the effect on a chromatographic peak of introducing the sample at too slow a rate

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