chemistry! URGENT

60,827 results, page 66

Chemistry

What is the energy and frequency of a photon with a wavelength of 2.57 ×102 m?

chemistry

How to calculate the concetration on a Beer's law plot?

chemistry

q4 What element has the greatest first ionization energy? Li Na K Rb Cs

chemistry

What is the approximate effective nuclear charge for arsenic ?

Chemistry

In which condition(s) can I get this reaction: Fe + H2SO4 = Fe2(SO4)3 + H2

chemistry

how many ml of nitric acid will neutrilize 20 ml of KOH at .5 moles

chemistry

why does the neutrality in the blood depends on the concentrations of [H+] and [OH-] rather than pH.

Chemistry

How much heat is absorbed when 60.0h of ammonia is vaporized ?

chemistry

How many equivalents of an acid or base are in the following? 0.43mol Mg(OH)2 and 2.8g Mg(OH)2?

chemistry

find the numbers of elerctorins in 18ml water

Chemistry

Explain why a catalyst speeds up a chemical reaction.

Chemistry

Why may the absorbance of a filtrate be higher than it's theoretical concentration?

CHEMISTRY

ARRANGE THE FOLLOWING 0.1 M SOLUTIONS IN ORDER OF INCREASING PH

chemistry

What is the mass of 225ml of a liquid that has a density of 0.880g/ml

Chemistry

Calculate the frequency of an electron traveling at 1.85X10^7 m/s.

chemistry

What is the dominant intermolecular force for propionic acid?

Chemistry

Does aluminum dissolve in acidic and basic solutions?

chemistry

how is silver separated from its soluble salt solution?

Chemistry

How many grams of rust are produced from the oxidation of 10.0 lb of iron?

Chemistry

Round to the correct number of significant figures. 1) 6.02/2.23 2.70 2) 18.42/2.34 7.87 3) 35.15/3.10 11.3

Chemistry

How would you know if AgNO3 + Al(NO3)2 forms a precipitate?

chemistry

What is the molecular weight and formula for petroleum ether?

organic chemistry

how many atoms are there in 42.2g of sulfur divided by 1.0x10 to 23

Chemistry

How many hydrogen atoms are in a 15.00 mg sample of glucose? (C6H1206)

chemistry

Write the differences between atom and molecules?

chemistry

Which ions are formed during electrolysis of water?

Chemistry

A solution of NH3 in water has a pH of 11.17. Calculate it's molarity

Chemistry

Explain the role of CH3CO2Na n the preparation of Fe(C5H7O2)3)3

Chemistry

Explain the role ch3co2na in the preparation of fe(c5h7o2)3

chemistry

What mass of water can be heated from 45C to 88C with 28 kj?

Chemistry

How do I find the number of grams of .25 moles of neon?

analytical chemistry

At what ph will Al(OH)3 begin to preciptate from a .10 M solution of AlCl3?

Chemistry

How much heat (in kilojoules) is released on reaction of 5.30 g of Al?

chemistry

How many oxygen atoms are present in 2.00 millimoles of H2SO4?

chemistry

what can be separated into atoms with a chemical reaction.

Chemistry

Calculate the number of ion 16g H2CO3

chemistry or physics

What is the speed of light in scientific notation?

chemistry

Determine the pH of a 1 M aniline solution (Kb = 4.2 10-10). I am unsure how to start, any help?

CHEMISTRY

2BrF3(g)Br2(g) + 3F2(g) STANDARD ENTHALPY?

Chemistry

Which of the following is a monatomic cation? Br NH4+ SO42– Fr+

chemistry

how many oxygen atoms are in 10 formula of Al2(SO4)3

chemistry

the number of moles in 12.04x10^23 molecules of Oxygen

Chemistry

How do shape and symmetry influence the polarity of a molecule?

Chemistry

What is the chemical formula and name when the following are added: 1. Na+1 Na-3 2. Na+1 Br-1 3. Na+1 O-2

chemistry

Is bp of para and meta and ortho isomer are same

chemistry

How many molecules are in 24.0 g NO2? Answer in units of molec.

chemistry

Tell me plz how we can characterize the compound K3[Al(c2o4)3]?

Chemistry

If a solution has a large Kb value, will it have a high pH?

Chemistry

Which THE PH VALUE OF A solution 0,01 mol/l a monoacido that presents ka= 1×10-6

Chemistry

how many L of O2 are needed to react completely with 63.0 L of H2S and STP?

Chemistry

Name the element that has a density of 4.700 g/mL at STP

chemistry

How much energy is absorbed to change 7.25 g of ice at -3 C to 25.5C?

Chemistry

What is the pOH of a 0.2M buffer solution of NH 4 + 0.2M NH4NO3 at 25 ° C. PKP = 4.74

Chemistry

How does the molecular wight of the gas affect the k-value?

Chemistry

how do you make 400 ml pf 2 Osm solution of Mg CL2?

Chemistry

What are the correct IUPAC names for triisopropylmethane and 2,2-dimethylcyclopentane?

chemistry

Let I know the equation with symbol of 'iron2oxide from iron fillings'

chemistry

What are the correct IUPAC names for triisopropylmethane and 2,2-dimethylcyclopentane?

chemistry

what does the spectrum of hydrogen tell us about its electrons?

Chemistry

Why do warm temperatures speed up the fermentation of milk?

Chemistry

Why is methanol a good solvent to recrystallize biphenyl?

Chemistry

What will be the volume of ammonia formed from 2L of nitrogen and 2L of hydrogen

Chemistry

I need to write a hypothesis on limiting reactants.

Chemistry

how many atoms are there in 1.13 liters of hydrogen peroxide H2O2?

Chemistry

Calculate the weight % of HOAc in pure Vinegar?

Chemistry

What is the mass needed to make 8.5L of a 4.0 M solutution of Na2SO4? (Na=23, s=32, O=16)

Chemistry

How many grams of nitrogen are present in 2 moles of HNO3?

chemistry

what is the charge balance equation for acetic acid?

Chemistry

How do you complete the following by writing products? #1.Ca(OH)2+MgCl

chemistry

I don't understand the difference between endothermic and exothermic?

Chemistry

Water is a great solvent for ionic compounds because of its ??

Chemistry

Why is the equivalence point pH of the HCl-TRIS titration = 4.6?

chemistry

1.how to prepare a)200ml of a 4MHCl? b)100ml of a 1.5NaOH?

Chemistry

What is the solubility, in moles/liter, of PbCl2 if the Ksp =7.3 x 10^12

Chemistry

0.0045 M HNO3 calculate the H3O concentration

Analytical Chemistry

Calculation Of K2mno4 In Lab Class?

Chemistry

What is the osmolality of 1.1% NaCl salt solution? How can I calculate this?

Chemistry

How many ethane will be burnt to produce 0.1moles of steam.

Chemistry

What is the molarity of 10g of H2SO4 in 100ml of water?

Chemistry

A solid at room temperature that can conduct electricity

Chemistry

Which of the following orbitals designations are not possible? explain why. A: 8s, 2d, 7p, 4f, 1f. B: 3f, 6p, 3d,1p, 8d.

science(chemistry)

How is ethanol after 1 minutes of evaporation

Chemistry

5 grams of H2 reacts with 16 g of O2, which in excess? 2H2(g)+O2(g)=2H2O(g)

Chemistry

In the zinc-copper cell, Zn(s) | Zn^+2(1M) || Cu^+2(1M) | Cu(s), which electrode is negative Cu^+2 Cu(s) Zn(s) Zn^+2***

Chemistry

What is the pH of a 0.05 M solution of acetic acid knowing that it was 2% ionized

Chemistry

In the zinc-copper cell, Zn(s) | Zn^+2(1M) || Cu^+2(1M) | Cu(s), which electrode is negative? Cu^+2 Cu(s) Zn(s)*** Zn^+2

Chemistry

98.4 * (1/2)^(19/3.8) = 3.075 g CH3COOH*** H2PO4^– LiOH NH3

chemistry

How many significant figures are in the measurement 603.040 g? A. 3 B. 4 C. 5 D. 6 C?

Chemistry

When the equation Fe + O2→Fe2O3 is balanced, the coefficient for O2 is: A. 4 B. 3 C. 1 D. 2 D?

chemistry

. Which of the following is not a way an atom can achieve stability?

chemistry

Calculate number of electrons present in 9.5g of PO4^3-

Chemistry

What is the required volume of an acid to prepare 2 L of solution a 10% (v/v).

Chemistry

How many mol of hydrogen present in 16g methane

Chemistry

Why water can be used as a solvent in paper chromatography?

chemistry

Discuss the structure of bonding in copper acetate?????

chemistry practical

Why? alkaline solution didn't puppet out.

chemistry

what is the precipitate form of 2naoh+cuso4->na2so4+cu(oh)2

Chemistry

How many grams of O2 are there in a 50.0L tank at 21*C when the pressure is 1.19x10^4mmHg?

chemistry

molar solubility of nitrogen at 25 degree celcius

Organic Chemistry

Why is helium considered a noble gas?

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