chemistry! URGENT

60,135 results, page 67

Chemistry

Calculate the number of valence electrons in BF3.

Chemistry

Why was sublimation performed under reduced pressure?

chemistry

How many grams of O2(g) are needed to completely burn 17.3 g of C3H8(g)?

Chemistry

How Would You Classify The Oxides Of period3A Elemet?

CHEMISTRY

Mg(s) + FeCl2(aq) → MgCl2(aq) + Fe(s). IS THE IRON(II) ION OXIDIZED?

chemistry

what is the net ionic equation for AlBr3(aq) + 3LiOH(aq)

Chemistry

If a chemical reaction uses 140 g of N2. How many moles is this? n=m/M

chemistry

Calculate the concentration of all species in a 0.20 M KF solution.

Chemistry

what mass of h2o is formed when h2 reacts with 384g of o2?

chemistry

What will be the color of litmus paper when tested with lime?

Chemistry

Rank from longest to shortest bond length: Si-O, Si-H, Si-S

Chemistry

what is the balanced equation for Sodium Hydroxide and Water

chemistry

Why does CdS dissolve in HCL, when CuS and Bi2S3 will not?

chemistry

How many molecules of lactose are there in one liter of buttermilk?

Chemistry

Does CH2CH2CH2CH2CH2CH2CH2 represent the polymer segment polyethylene?

chemistry

The oxidation number of sulphur in CuSO4.5H2O is ......

chemistry

water cannot cook beans on the moon.explain

Chemistry

Do all salts conduct electricity in water? Why or why not?

Chemistry

If 6.0g of CH4 and 5.0g of O2 are used, what is the mass of CO2 produced?

Chemistry

Find moles of O atoms in 9.00g of Mg(NO3)2.

chemistry

how to calculate the oxidation state only for 'cr'in K2CRO4

Chemistry - Naming

What would be the name of this compound? Si4Br8

chemistry

why the melting point of iron is greater the that of sodium?

Chemistry

Aldol condensation of formic acid will create?

chemistry

How many grams of Al2(SO4)3 can be produced from 10.0g of CuSO4?

chemistry

AsH3 is more acidic than NH3 explane

Chemistry

How many mL of 1.20 M H2SO4 are needed to neutralize 18.75 mL of 0.843 M LiOH?

Chemistry

If it takes 15.0 mL of 0.450 M HNO3 to neutralize 22.00 mL Cu(OH)2, what is the molarity of the Cu(OH)2?

Chemistry

Calculate the moles of Carbon dioxide in 7.5×10 power 24?

Chemistry

What is the positive valence of Sodium Sulfate? (Na2SO4)?

Chemistry

A solution contains I-, Br- and OH- ions. If Ag+ is added, what will the precipitate(s) be?

CHEMISTRY

Which type of solid is predicted for HCl, Na, CaCl2???

chemistry

What is a chemical property of dihydrogen monoxide? please help

chemistry

what is the common name for sodium acetate? please help

chemistry

How does the saturation of a solution affect crystal formation?

chemistry

how do i prepare a 500g/L solution of ethylene glycol

Chemistry

How much the reaction is complete when Kc=1? Plz explain

chemistry

At room temperature pure water has a density of 1.00 g/ mL. What mass of water (in grams) will fit into a container if 1.00 lb. of mercury completely fills the container? Okay, here is what I solved so far. Let's say H2o equals water and Hg equals mercury= 13.6g/mL. equals an ...

Chemistry(Please help!!)

For a chemistry lab the experiment was to carry out an acid-base titration to determine the exact concentration of a sodium hydroxide solution. Two trials were completed and the data collected was: mass of weighing paper, mass of weighing paper + KHP, mass of KHP, initial ...

Chemistry

How do you prepare 600.0mL of 0.48M Al(NO3)3*9H2O? Is this correct? 1. Measure out 71g of solution 2. Put approx. 300.0mL of water into container 3. Add the 71g of solution to the water and mix 4. Add more water until 600.0mL of solution is obtained 5. Mix •Chemistry - ...

Chemistry

Nitric oxide (NO) reacts with molecular oxygen as follows: 2NO(g) + O2(g) ¨ 2NO2(g) Initially NO and O2 are separated as shown below. When the valve is opened, the reaction quickly goes to completion. Determine what gases remain at the end of the reaction and calculate ...

chemistry

I'm sorry, but this is a re-post. I couldn't find the original post;-( so, does anyone have any suggestions for helping a student make a passing grade in college chemistry? She took it twice and didn't pass. Any suggestions would be appreciated. I thought maybe some websites ...

chemistry- some help plzz totally lost on this one

Imagine that you are in chemistry lab and need to make 1.00 L of a solution with a pH of 2.70. You have in front of you * 100 mL of 7.00×10−2 M HCl * 100 mL of 5.00×10−2 M NaOH, and * plenty of distilled water. You start to add HCl to a beaker of water when ...

Chemistry

Hi, I'm trying to solve some chemistry problems, like the ones my teacher says will appear on our exams. The problem reads like this: What is the hydrogen conentration in a bleach sample that register 9.55 using a pH meter? My Attempt: Since this sample register a 9.55 on a pH...

Chemistry

General Chemistry 111 11/28/11 Chapter 9 Extra Credit Quiz Name: _____________________________ Section #______________________ Tetrahedral geometry has a bond angle of about 109.5 °. Given that a tetrahedron is made up of 4 equilateral triangles each of length x, what is the ...

Chemistry-DrBob222

Is the answer for part c 0.91? A 1.0 L ball containing Ar at 5 atm is connected to a 10.0 L ball containing N2 at 2atm. A)Calculate the partial pressures and mole fractions of Ar and N2 after the valve is opened and the gases are allowed to mix (they fill the balls on both ...

organic chemistry

can a molecule act both as an electrophile & nucleophile?

Chemistry

What is the pH of a solution with [OH-] = 2.5 x 10-3? I don't even know where to begin with this problem :( You know [OH] + [H+] = 1*10^-14 so solve for [H+], then pH= -log [H+]

chemistry

It forms NH4Cl, ammonium chloride, which is soluble in the water.

Chemistry

Which of these metals are important the the US economy and defense? Mn, Pt, Cr, Co, Pd, Fe i would say Cr Co Pd and Fe

chemistry

a solution in which no more solid can be dissolved is referred to as ???? Saturated?

Chemistry

What is the exact concentration of hydroxide and hydrogen ions at pH 6?? Help! how do i find this?!?!?!

Chemistry

Do either maleic or fumaric acids have dipolemoment?

Chemistry

I need help with this conversion. 548.6 mL=_____ meters cubed

Chemistry

why mass cannot be used as a property to identify a sample of matter?

chemistry

how many mL of a .25 M HCL would be required to neutralize completely 30mL of a .2 M Ca(OH)2

AP chemistry

If the percent hydration of CuCl2 x XH2O is 13% what is the coefficient of water?

Chemistry

What is the suffix for an alcohol which contains more than three -OH groups?

chemistry

what is the formula for cobalt (III) chloride and sodium hydroxide

Chemistry

What are the 3 rule the govern the filling of atomic orbitals by electrons?

CHEMISTRY

Why does the solvent move upward in thin layer chromatography

chemistry

What is the valency of selenium in five membered ring system?

chemistry

Determine a compound that will precipitate the (Hg2)^2+ in Hg2X2(soluble).

chemistry

Explain what subatomic particles mke up an atom and how are they arranged

Chemistry

Is the relative Formula mass for Aluminium Oxide simply : Al = 27 , O = 16 27+16 = 43?

chemistry

what is the gas constant (R) for mm Hg? 8.31 is for atm .08206 is for kPa right?

chemistry

what are the coefficients a, b (van der waals equation) for nitrogen/ N2?

Chemistry

how do you purify Biphenyl contaminated with Fluorene? what is the method and solvent?

Chemistry

Which group of elements are all gases at room temperature?

Chemistry

Balance the equation: C3H5(NO3)3 ---> CO2 + H2O + N2 + O2

chemistry

Is almost all the mass of an atom concntrated in the nucleus?

chemistry

Why can't we add charcoal to benzoic acid in purification by sublimation

Chemistry

What are some factors that affect the solubility of ionic substances?

Organic Chemistry

What are the monosaccharides present in starch, glycogen, and cellulose?

chemistry

How many phosphorus atoms are in a 0.3352 g sample of Ca3(PO4)2 ?

chemistry

What is the nitrogen-oxygen bond order in potassium nitrite

Chemistry

I need help finding the molar mass of anhydrous salt.

Chemistry

Can someone help me balance this i tried and didn't succeeded. Fe2O3 + CO --> Fe + CO2

Chemistry

From elements Arsenic to Antimony, which has the smallest Ionic Radius and why.

chemistry

Calculate the pH of a solution (to 2 decimal places) which is 0.106 M in phenol, Ka = 1.0 x 10-10.

chemistry

What is the effect of using cyclohexane as the solvent in the bromination of acetanilide?

AP chem

is there anyway that i could also get help with the chemistry problem that eric posted?

chemistry

calcualte the molar mass of this compund carbon disulfide

Chemistry

how do Al and Cl ionically bond with each other? I think its AlCl3 am i right?

chemistry

what are the reasons why the Cu(II) solution has to be titrated immediately after addition of KI?

Chemistry

What are the five(5) indications that show that a reaction has taken place? Thanks

Chemistry

Write the formula for each Ionic compound. *barium nitrate

Chemistry

what are three chraracteristics of metalloids and 2 characteristics of noble gases

Chemistry

I'm so confused! Al + O2 -> Al2O3 This is supposed to be a balanced equations but how did it go from 2 oxygens to 3?

Chemistry

what is the approx. atomic weight for Boron? (to the nearest tenth)

Chemistry

How many neutrons are there in a phosphorus atom? I believe the answer is b. 16 a. 15 b. 16 c. 31. d. none

Chemistry

What does the point at which your curve crosses the horizontal axis represent?

Chemistry

How can you tell the wavelength of blue light if given it's frequency?

chemistry

the third quantum number, m, indicates what property of the electron?

Chemistry

Which substance will be attracted to a charged balloon NH3 or CH4? Why?

chemistry

explai9n why methane is a non polar substance. please help

Chemistry

What volume of 0.0500 M Ba(OH)2 will react completely with 27.50 mL of 0.550 M HCl?

chemistry

How do I give a name for the following? K2CO3 Fe2O3 PbCrO4

Chemistry

Of the following, _______ is a correct statment of Boyle's law.

Chemistry

Why does Aluminum and Sulfur have low ionization energies?

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