chemistry! URGENT

59,905 results, page 72

Chemistry Help

Which of the following species are isoelectronic? Select all that apply. 1) S^2- 2) Be^2+ 3) Cl^- 4) K^+ 5) Ca^2+ 6) Se^2-

Chemistry

In each of the following pairs, choose the species with the larger radius. 1) S^4+ or S^2+ 2) S or S^2-

Chemistry

Which of the following species are isoelectronic? Select all that apply. 1) S^2- 2) Be^2+ 3) Cl^- 4) K^+ 5) Ca^2+ 6) Se^2-

Chemistry

In each of the following pairs, choose the species with the larger radius. 1) S^4+ or S^2+ 2) S or S^2-

Chemistry

The solubility of zinc oxalate is 7.9 x 10 ^-3 M at 18 degrees C. Calculate its Ksp.

Chemistry

how could you improve the product yeild if you had to redo the synthesis

chemistry

Why is the pH at the endpoint of the titration of a weak acid by NaOh greater than 7.0?

Chemistry

What is the maximum [Ba^2+] that can be maintained in 1.100 L of a 030 M solution of Na2SO4?

Chemistry

1. Which element forms bonds with a sea of mobile electrons? a) Ca b) C c) Ar d) He

Chemistry

1. Which element forms bonds with a sea of mobile electrons? a) Ca b) C c) Ar d) He

chemistry

Calculate the mass of 2.56*10^24 formula units of aluminum dichromate.

chemistry

apply quantum theory to explain the photoelectric effect

chemistry

How many of grams of aluminum would be produced from the decomposition of 21.0 g of Al2O3

Chemistry

How many unpaired electrons are in the electron structure of 24 Cr, [Ar]4s1 3d5

Chemistry

What is the ionization energy (in kJ/mole) of the hydrogen-like ion F8+ ?

chemistry

What is the formula for the compound formed when potassium reacts with nitrogen?

college chemistry

How many grams of Mg(OH)2 can be prepared from the reaction of 20.0g of Mg3N2 with 10.0g of H2O?

college chemistry

what is the highest freezing point of H2O, NaCl, and HF

chemistry

how many mL of 1M HC2H3O2 are required to neutralize a spill of 25mL of 6M NaOH?

chemistry

What is the density of CO2 gas at -25.2 degrees celsius and 98.0kPa?

Chemistry

Calculate the energy of a photon of light with a wavelength of 360 nm?

Chemistry

What is the theoretical yield of PI3 from the reaction of 27.0 g of P and 68.0 g I2? 2P(s)+3I2(s) 2PI3(s)

chemistry

if you have 52 grams of hydrogen chloride in 6 liters of solution , what's the ph ?

chemistry

How many grams of AgNo3 are required to make 25 mL of a .80M solution?

chemistry

A saturated solution of PbSO4 has [Pb^2+] = 1.35E-4M. What is the concentration of SO4^2-? thanks

Chemistry

How many molecules of water are produced if 2.00 g of ammonia and 4.00 g 02 are reacted together?

Chemistry

What element has the final electron configuration as 3s2 3p4?

chemistry

give the name and formulas of the compounds that rust is composed of

chemistry

give the name and formulas of the compounds that rust is composed of

chemistry

When NH3(aq) is added to Cu^2+ (aq) a precipitate initially forms. what is its formula?

Chemistry

what is the gram molecular mass of the compound with the formula CH3COOH ? (1)22.4 g (2)44.0 g (3)48.0 g (4)60.0 g

chemistry

how many grams of CaCl2 must be dissolved to make 2.15 L of 0.05020 M Cl

chemistry

how many grams of CaCl2 must be dissolved to make 2.15 L of 0.05020 M Cl

chemistry

calculate the pH of a 1.94M solution of nitrous acid (HNO2 - ka = 4.5E-4).

chemistry

my moth balls froze at 54 degrees celsius, what kind are they?

chemistry

give the solgel preparation of zirconium oxide powder

Chemistry help plz

How to calculate the hydronuim ion cencentration of solution with a pH of 2.5?

chemistry

What is the molar mass of Mg(NO3)2? Explain how you calculated this value.

chemistry

Convert 66 moles of NO2 gas at STP to liters

Chemistry

How many grams of NaOH will react completley with 100 mL of 1 m of HCL?

chemistry

what is the mass of Na2CO3 needed to contain 15 grams of sodium?

Chemistry

when the beaker has rated capacity of 10 ml, does it mean that it has to be filled to the brim?

chemistry

if 150g of Ca(OH)2 is reacted with excess H2, how much energy will be needed?

chemistry

what is the density of methyl gas at 25 degrees celcious and 1.50 atmosphere.

chemistry

For neutralization of 10ml 10% sodium carbonate how many 1N H2SO4 is required?

chemistry

A ballon has a circumference of 42 cm what should the volume be in centimeters cubed?

chemistry

what is the length of an equilateral triangle when the area is 45 meters square?

chemistry

which is the symbol for the following monatomic ion? 8 protons and 10 electrons

chemistry

What is a typical speed for a N2 molecule in this room? a) 50 m/s b) 500m/s c) 1500 m/s

chemistry

How many molesof carbon dioxide can be produce from 4.44 moles of KMnO4?

chemistry

what would be the mass of an object if its density was 0.34 g/ml and had a volume of 23 ml?

chemistry

what is the temperature in degrees celsius that your silver becomes a gas?

chemistry

a sample of freshly pressed apple juice has a pH of 3.76. Calculate [H+].

chemistry

A solution formed by dissolving an antacid tablet has a pH of 9.18. Calculate [H+].

chemistry

What is the mass of 4.80 multiplied by 10-2 moles of zinc chloride (ZnCl2)?

chemistry

what is the volume of a piece of wood that haas a mass of 6 g and a density of 0.5 g/mL?

chemistry

can fractional distillation be used to determine purity of a compound?

chemistry

calculate the mass in grams of .354 moles of NH3

chemistry

NaCL is composed of 39.3% Na and 0.7%. Calculate the mass of Na in 0.375gm salt.

chemistry

What is the nuber of grams of oxygen present in 4.50 x 10^22 SO3 moleucles?

chemistry

what is the molarity of a solution when you ha 2mole of ammonium chloride (AgNo3) in 1L?

chemistry

how do i come up with POEM about significant digits please help

chemistry

How many grams are there in 2 moles of each of the following? A)Xe2 B)C6H12O6 C)CH3COOMg

Chemistry

Which of the following can be amphoteric? A) Cl¯ B) H3O+ C) HPO4¯ D) PO4¯³ E) HCl

10THGRADE CHEMISTRY

HOW WOULD YOU PREPARE ML OF A 0.250M SOLUTION OF Ca(NO3)2?

chemistry

what is the name of the compound made ofrom chlorine and magnesium

chemistry

how do you Prepare a 0.1 L of a 0.1 M NaCl solution, and describe the process in writing.

chemistry

how do you Prepare a 0.1 L of a 0.1 M NaCl solution, and describe the process in writing.

chemistry

the shape and nonding in a Br2 molecule is best described as

chemistry

complete the table a, 355km/s ------cm/s -----m/m b,1228g/L ------g/mL ------kg/ML C,554MK/S ------K/S -------UK/MS D,2.554MG/Ml ------J -------mJ

chemistry

expalin how Henry's law help a patient stay alive?

CHEMISTRY

How many grams are there in 2 moles of each of the following? A)Xe2 B)C6H12O6 C)CH3COOMg

Chemistry

Write a net ionic equation for Hg(C2H3O2)2 + NaI

chemistry

As AgNO3 dissolves, what change occurs in the temperature of the solution?

Chemistry

Rearrage the following equation to make sence, Q=CWxMxT

Chemistry

Can visible light cause excitation of an electron in water? explain

chemistry

If you have 64.3 g NH3, how many grams of F2 are required for complete reaction?

Chemistry

What is the rate law of the reaction 2NO2 gives N2O4?

chemistry

What is the rate law for N2O4+CO yields NO+CO2+NO2?

chemistry

How can you tell if two compounds that you steam distilled are pure?

Chemistry

Calculate the pH of a 0.250M solution of Sulfurous acid, H2SO3.

Chemistry

How many ml of 1M HCl would you need to make 50.0 mL of 0.125M solution?

Chemistry

How many ml of 1M HCl would you need to make 50.0 mL of 0.125M solution?

chemistry

What is the approximate thermal energy in kJ/mol of molecules at 275° C

Chemistry

What is the pH when 3.46 mL of 2.37 M KOH is added to 26.9 mL of a 1.78 M solution of formic acid (HCOOH)?

Chemistry

what mass of carbon dioxide is produced by the combustion of 50.0 g of propane

chemistry

What would be the pH of 0.568 g of HClO4 per 250 mL of solution?

College Chemistry

Determine the pH of a solution that contains 5.3*10^-2 M in HClO4 and 3.0*10^-2 M in HCl?

Chemistry

How do you dilute 100mL of 20ppm Fe3+ to 1,2,4,6,8 ppm, 50mL each?

Chemistry

What? If anything, is wrong with the following sets of quantum numbers. a. n = 2, l = 2, ml = 0, ms = +1/2 b. n = 0, l = 0, ml = 0, ms = -1/2 c. n = 3, l = 2, ml = -2, ms = +1/2 d. n = 4, l = 2, ml = 2, ms = -1/2

chemistry

Determine the number of grams of gas in 1.5 x 10^13 atoms of helium?

chemistry

Find how many moles of KF are produced when 100g of kci are used?

chemistry

Put the molecules in order of increasing bond polarity H-F, C-N, AND F-N.

chemistry

What is hybridization and wahta are the different hybridizations for each molecular geometry?

Organic Chemistry

what is the major product if 2,3,3-trimethylpentane was mixed with IBr?

chemistry

what is the mechanism of urea based precipitation of copper nitrate?

Chemistry

Change 50.0 ml at standard conditions to 43 degrees celsius and 750mmHg

chemistry

Calculate .200 mol sodium phosphate in 10.0 ml of solution

chemistry

LiOH + CO2 ----> Li2CO3 + H2O 1. how I can balance the equation?

chemistry

how will u prepare 500g of aqueos solution which is 10% NaOH by mass?(%W/W)

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