chemistry! URGENT

60,378 results, page 60

chemistry

what is the ph of a solution that has [H] = 0.0045 can you show steps pls

Chemistry

How many moles of gas would be in 2.0 L of oxygen at STP?

Chemistry

Does helium have a smaller volume than hydrogen?

chemistry

How many liters of base will neutralize 1 liter of acid?

Chemistry

Condensation is considered an exothermic process is this true?

Chemistry

Which electron configuration best represents bromine?

chemistry

why is NO equal to nitrogen oxide isn't the charge of N ion +3?

chemistry

Balancing redox equations reactants: Cu, NO3

Chemistry

how many moles of o2 are needed to produce 3.91 mol fe2o3

chemistry

how many half lives will it take for 50 g of 99Tc to decay to 6.25 g?

Chemistry

A 0.39 M solution of a weak acid is 3.0% dissociated. Calculate Ka.

Chemistry

Calculate the pH of a 0.053 M (C2H5)2NH solution (Kb = 1.3 10-3).

chemistry

Calculate the pH of a 0.063 M (C2H5)2NH solution (Kb = 1.3 10-3).

chemistry

how do i change 2866.0 J to kJ/mol? can someone please help me?

chemistry

2. What is the density of propene gas measured at 2.5 atm and 47 C?

chemistry

Air dry weight of MgNH4Po4 * 6 H2O

chemistry

What is the wavelength of a 2500 kg truck traveling at a rate of 70 km/h?

chemistry

how would you prepare 300 ml of a 10% CaCl2 solution (w/w)?

chemistry

What is the electron-domain (charge-cloud) geometry of

Chemistry

Which is a polar covalent bond? PbCl2 or CS2?

Chemistry

20 degrees C is 6 g Cu So4/25 g H2O is this saturated or unsaturated?

chemistry

The pH of an HCl solution is found to be 1.74. Therefore the [H3O+] is:

chemistry

You have a 0.0825 M solution of HCl. You expect the pH to be

chemistry

Phenolphthalein turns __________ when the solution is basic.

chemistry

What is the mass percent oxygen in the compound NaNO3?

chemistry

pH is defined as 10^-log [H3O+] True or False

chemistry

How many grams of na cl are required to make 500ml of a 0.65 percent w/v

Honors Chemistry

What is the Lewis dot diagram for C2Cl2?

chemistry

if 2.2g of h2 and 1.25g of n2 are present, how many grams of nh3 will be produced

chemistry

What mass of ZnCl2 is needed to make 4 L of 1.8 M solution?

chemistry

who made (arranged) the modern periodic table?

chemistry

How could I determine if a white liquid contained lactose?

chemistry

What are the steps of protein synthesis starting with DNA?

chemistry

how can you tell if a reactant is being oxidized or reduced

chemistry

how can you tell if a reactant is being oxidized or reduced

Chemistry

Is this reaction exothermic or endothermic? Fe(NO3)3+ NaSCN

chemistry

liters in 2.39x10^23 molecules of nitrogen triiodide

chemistry

what is some background on the ideal gas constant R

chemistry

does caco3 can easily pick up moisture from the surroundings?

chemistry

find Equimolar ratio of HClO2 & NaOH

Chemistry

Why is bond energy defined only for gases?

chemistry

How do you calculate the mass, in amu of 2287 atoms of Li

Chemistry

Why does it take more energy to remove a electron from Al+ than from Al?

chemistry

What is the mass of 4.54 10-2 moles of zinc chloride (ZnCl2)?

Chemistry

Calculate the enthalpy change at 300kalven for the reaction?

chemistry

what is the procedure that is used to find actual yield?

Chemistry

What is the formula for Celsius and Kelvin scales for temperature?

chemistry

If 50.0 g of Ba(CN)2 reacts to produce 12.9 g of HCN, what is the percent yield?

chemistry

Calculate the number of moles in 35.7 grams of Na3PO3

Chemistry

How many moles of atoms are in one mole of AlPO4?

chemistry

how many significant figures does the sum of 8.520 the 2.7 contain?

chemistry

why are the atoms in metallic bonds positively charged?

Chemistry

What happens to the valence electrons in metallic bonds?

Chemistry

What is the energy of a mole of UV photons having a wavelength of 11 nm?

chemistry

In formula for where ferenheit and celsius converge (T = T x 9/5 +32); what is the logic that T x 9/5 = T + T = 4/5?

Chemistry

Benzene burns with intense smoky flame,this is b/c ?

Chemistry

How many grams of CO2 are formed when 32 g of O2 reacts with 23 g of C2H5OH?

Chemistry

which is more soluble in water: cyclohexane or glucose?

chemistry

Determine the boiling point of water at 698.5 mm Hg.

chemistry

what is the heaviest element with a single letter symbol?

Chemistry

What is the pH of a 0.01M solution of arginine that has a net charge of -.65?

chemistry

What would happen if O2 were added to N2(g) + O2(g) 2NO(g) at equilibrium?

Chemistry

1/2.165 = sqrt x/131.29. I am not sure how to solve for x.

Chemistry

Indicate which of the following quantum numbers are unacceptable: (a)(1,2,0,1/2) (b) (3,2,0,1/2) (c)(3,2,2,1) (d) (4,3,2,-1/2)

CHEMISTRY

What happens to the NH4+ and Cl] ions when they enter the water

chemistry

how many grams are contained in 500.g of a 25% solution of H2SO4?

chemistry

how many moles of oxygen are required for the combustion of 25.5 g of magnesium

chemistry

203.77miles/sec is converted to cm/nsec

chemistry

what did amedeo avogadro contribute to the atomic theory?

physics/chemistry

is conductivity a physical or chemical property

chemistry

At which temperature is NaCl more soluble in water, 0°C or 90°C? 0°C 90°C

Chemistry

A detergent solution has a pH of 11.63 at 25°C. What is the hydroxide-ion [OH-] concentration?

Chemistry

How do you draw a lewis dot structure of s3o

chemistry

what are three common ores from which copper can be extracted

chemistry

A Solute That Removes Hydrogen Ions from Solution

Chemistry

What compounds can be formed by the reaction of K2SO4 and BaCI2?

chemistry

calculate the pH of 20.00mL of 2.00 M HCl diluted to 0.500 L

chemistry

what isw the density of N2O,a gas at STP?

chemistry

How do you balance a chemical reaction word equation?!

chemistry

Which has the higher boiling point? (a) CH3CH2CH2CH2CH3 or (b) CH3CH2CH2CH2CH2CH2CH2CH3

chemistry

questions related to yield of chemical reaction.

Chemistry

Calculate the [H+], [OH ‾ ], and the pH of 0.16 M solutions of: hydroxylamine (HONH2, Kb = 1.1 10-8)

chemistry

how many moles of suctose are in 0.8L of a 2M solution? How many molecules of sucrose is this?

chemistry

What would happen if O2 were added to N2(g) + O2(g) 2NO(g) at equilibrium?

Chemistry

How many mL of 5.5 M KOH are needed to prepare 300 mL of 1.2 M NaOH?

Chemistry

Consider a solution containing 0.150 M Ba(OH)2. Calulate the pH.

chemistry

Mr=112.11 and 0.146mg/mL how do I change thiss to mmol/L

chemistry

please give me an example of a nanocomposite material

chemistry

The approximate pH of a 3.0 x 10-3 M solution of the strong acid H2SO4 is a) 3.5 b) 3.0 c) 2.5 d) 2.2 e) -3.0 how do you do this?

chemistry

The Ka for HOBr is 2.4 x 10-9. Thus, you can report the pKb for OBr– as a) 4.2 x 10-6 b) 9.62 c) 5.38 d) 8.62 e) 1.38 help!

Chemistry

Which one is the LR? Ag or S? 2Ag + S → Ag2S = 216 g Ag + 32 g S

chemistry

Write a balanced reaction for the formation of Fe2O3 (s)?????

chemistry

v=555mL at 1.00 atm. what is the volume at 689 torr?

Chemistry

So,my second method is correct isn't it? The answer is -78.4kJ?

Chemistry

How many mL of 3.0 M HCL are required to neutralize 250 mL of 2.0 M MgCL2 ?

Chemistry

Lewis Structure of Freon (CCI2F2)? And what is shape?

Chemistry

Empirical formula 12.67 aluminum, 19.73 nitrogen, 67.60 oxygen

chemistry

What is the volume at STP, in liters, occupied by 26.4 g of F2 gas?

chemistry

make 98.5 mL of 1.25 M barium nitrate from a 4.50 M solution. i do not know what to do with this information

Chemistry

How many moles of O are there in 32.4g N2O5, how many oxygen and nitrogen atoms are there in the 32.4g?

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