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science, chemestry

32,682 results

Basic science chemestry
Qulitative analysis table of znso4

Chemestry
What is the pH? 1.6 x 10^(-5)?

CHEMESTRY
What is an atom

chemestry
how many moles of 2g h

chemestry
what is the name of BCl3

chemestry
what is limiting reagent ?

Chemestry
how to balence an equasion

chemestry
at what temperature does ice melt

chemestry
what is the formula for boyles law

chemestry
sorry its 5-ethyl-2-hexyne

chemistry
what is brandy's solution in chemestry?

Maths.physics.chemestry.english
6x+1/2a -x-2/2a

Chemestry
Prove basics radical?

chemestry
what are four components of the water molecule?

chemestry
what is analgesics? what is its composition? what is their utility in curing?

chemestry
Given 10.0 L of N2 at - 78°C. What volume will the N2 occupy at 25°C (P is constant)?

chemestry
what is the charge on an ion with 25 protons and 29 electrons?

chemestry
what is the chemical formula for maganese(II)iodine?

Chemestry
How many moles of NaHCO3 are in a 44g sample?

chemestry
what is the density f 8L of N2 at 25 degreese C at 760 mmhg?

Science chemestry
calculate the average rate of a reaction. He placed 10.00 g piece of aluminium into 6.0 M HCl. After 20 s. he found that 4.50 g of unreacted magnesium remained. Calculate the average rate at which magnesium was consumed by the acid. #not I really do not understand the ...

chemestry
Which element of group 3A behave as a nonmetal or semimetal?

chemestry
what is the condensed structural formula for. 5- ethyl-2-hexene

Chemestry
HELP!!!!!!A solution made from 19.0 g of Na Br and 500 ml of water has what molarity?

chemestry
if my mass of my aluminum cube is 5.45 and volume is 2 ml, what i my density?

Chemestry
What property of paradichlorobenzene may convince you that it is an ingredient in mothballs?

chemestry
how many total atoms are there in the chemical formula B2(CO3)3

chemestry
what does air pressute do to the freezing, melting ad boiling point

chemestry
what does air pressure do to the freezing, melting ad boiling point

chemestry
The oxide ion O2- has the same electron configuration as neon?

chemestry
calculate the moles of compound in .540g of ammonium bromide

chemestry
if you dissolve 350 g of K(2)CrO(4)in 2.4 kg of water, what is the molality of the solution?

Chemestry
If an ion contains 50 protons,68 neutrons and 48 electrons.what is its symbol?

chemestry
what is the electron configuration of lithium after making an octet

AP Chemestry
The question is as follows: went wrong, I'd really appreciate it!

Chemestry
What is the volume of 454 grams of Ferrous sulphate heptahydrate?

chemestry
How many moles of zinc acetate, Zn(CH3COO)2, are there in 163 mL of a 0.160 M solution?

chemestry
I'm unsure how to figure this question out. "How many moles of Na2CO3 are there in 10.0 L of 2.0 M solution?"

chemestry
calculate the moles of compound in 0.540 grams of ammonium Bromide

chemestry
Calculate [OH^ - ] for strong base solution: 14.0 mL of 1.20×10−2 M Ca(OH)_2 diluted to 430.0 mL.

Chemestry
I got NaOH 7%, its density is 1,08g/ml. Calculate the molar concentration

Chemestry
Find the molarity of a solution containing 0.75 mol of NaCl with a volume of 1.5 L.

chemestry
Explain the physical significance of van der waals,parameters ?

Chemestry
Calculate the density of an object with a mass of 2.14g and a volume of 11.40mL.

chemestry
a compound salt Xcl2 contains 203% chloride what is element x?

Chemestry
When you were dissolving salt or sugar in a beaker of water, how did you know it was a saturated solution?

chemestry
what is the wavelength of the energetic spectral line in the ultraviolet series of the h atom and how to find it

Chemestry
why would it take longer to cook food in the mountians than at sea level?

chemestry
given 43 moles of KCl how much HNO3 is needed to complet the reaction

Chemestry
I got NaOH, 7%, and its density is 1,08g/mol. Calculate the molar concentration.

chemestry
How many molecules (not moles) of NH3\rm NH_3 are produced from 8.21×10−4gg of H2\rm H_2

chemestry
consider the reaction 2N2O(g) == O2(g)+2N2(g).which of the following will cause a shift in the equilibrium to the left?

Chemestry
determine the volume of a sample of plastic if the mass is 3.00g and the density is 1.24g/cm^3

chemestry
What is the enthalpy change when 24.0 g of water is cooled from 40.0°C to 5.70°C? _________kJIs the process endothermic or exothermic?

Chemestry
Calculate the volume of CO2 produce at N.T.P. by heating 200 gm 25% pure limeston

chemestry
how many moles of ammonia contain 1.51 x 10 24power NH3 molecules need help with formula please

analytical chemestry
100grms lead nitrate+20ml sodium hydroxide+100ml h2o =

Physiological Chemestry
How many grams of ethanol(C2H60) are formed from .550 moles of sucrose(C12H22O11)?

chemestry
Given the following chemical equation, determine how many grams of N2 are produced by 9.72 g of H2O2 and 6.53 g of N2H4

chemestry
show a correct numerical setup for determining how many litters of a 1.2M solution can be prepared with a .50 mole of c6h12o6

chemestry
how is ionizaion energy different from electron affinity? use a chemical equation to clarify your definition.

chemestry
what volume of hydrogen is formed when 3.00g of magnesium react with an excess of dilute sulfuric acid?

chemestry
A 1.00 g sample of naphthalene (C10H8) contains 0.562 g of hydrogen. What is the mass percent of carbon in the compound

chemestry
PLEASE,COULD ANYONE HELP ME to balance this redox reaction : Cr2S3 PbO2 + H2SO4 + -------> PbSO4 H2Cr2O7+H20

chemestry
How many mL of a 0.217 M aqueous solution of ammonium fluoride, NH4F, must be taken to obtain 3.63 grams of the salt?

CHEMESTRY
C3H8+5O2=3CO2+H2O How many liters of propaine (d=0.585g/ml) will produce 1.25L of water (d=1.00g/mL)?

Chemestry
Express condense order of increasing energy as a string without blank between orbit Barium Element

chemestry
Given the equation C2H4(g)+3O2(g)>2CO2(g)+2H2O(l)+1411kJ, how much heat is released when 8.00g of O2 react?

Chemestry form two
Balance chemical equations to show the reactions that occur when apice of sodium metal is ex posed to atmosphere

chemestry
In which of the following physical states does a given substance have the highest entropy? A. solid B. gas C. liquid D. all of the above would this be A?

chemestry
The element oxidized in the reaction described in PbO2 + 4HCl → 2H2O + PbCl2 + Cl2 is A. Pb. B. O. C. H. D. Cl. would the answer be A? please explain

chemestry
true or false the equivalence point is the point at which a neutraliztion reaction has occured

chemestry
What is the molecular formula for the folowwing compound? Empirical Formula: C3H6O2 (M=74.08 g/mol)

chemestry
What is the molecular formula of the following compound? Empirical formula C3H6O2 (M=74.08 g/mol)

chemestry
what is the final temperature of aluminum when 26.4 cal of heat is added to 18.1 g of aluminum at 21.0 degrees c

chemestry
Can you show me how to convert/solve this problem? 27 micro grams = ? grams

CHEMESTRY- POLARITY
how can you arrange these bonds from most polar to least polar O-C N-N N-O

chemestry
A 30,000 kg locomotive is moving at a velocity of 10 m/s east. What is the locomotive's momentum?

chemestry
The bonds in SiCl4(l) are srtonger than the bonds in SnCl4(l)? True or false and why? Thank u

chemestry
what is the molarity of a solution made by dissolving 3.86 moles of NaCl in 2.50 L of solution?

chemestry
if 40 grams of water are produced when 30 grams of ethane is burned what is the % yields

chemestry
1. Determine the pH of a solution containing 1.00 mol/L of HCN (Ka = 5.00×10–10) and 5.00×10–2 mol/L of HCl.

chemestry
the Earth has mass of approximately 5.98* 10^24kg and radius 6.38* 10^6m. what is the density of the Earth in (a)g/cm^3 and (b) kg/m^3 ?

Chemestry
the solubility of a gas is 0.34g/L at STP. What is it's solubility at a pressure of 0.80 atm and the same temperature?

Chemestry
How many moles of sodium chloride are produced when 25 grams of sodium reacts with chlorine gas?

chemestry
an oilo slick 110 nm 1.0 * 10^6 square meters of ocean.How many liters of oil are in the slick

kendriya vidyalaya chemestry
the boiling point temperature of liquid _____when it starts boiling

chemestry
How many grams of O2 are needed to produce 45.8 grams of Fe2O3 in the following reaction? 4Fe(s)+3O2(g) - 2Fe2O3(s)

Chemestry
What is the van't Hoff factor for K2SO4 in an aqueous solution that is 5.00 % K2SO4 by mass and freezes at -1.21 ∘C?

Chemestry
To fnd the empirical formula i have to convert the percent in g first, or a take the date in percent?

chemestry
Calculate the pH of a solution obtained dissolving 10 g of NH3 and 15 g of NH4Cl in 300 ml of water (Kb NH3 = 1.8 x10-5).

chemestry
how many grams of dioxygen are required to burn 5.9 grams of C2H5OH?

chemestry
How many grams of CaCl2 would be dissolved in 1.4 L of a 0.11 M solution of CaCl2?

chemestry
what are the heats of fusion/vaporization & specific heats of nitroglycerin

chemestry
what is the solvent of SSD(silver sulfadiazine)? And what is the solvent of Neosporine?

CHEMESTRY
Calculate how many grams of O2(g) can be produced from heating 65.8 grams of KClO3(s).

chemestry
Calculate the heat released (in joules) from the condensation of 25.0 g of ethanol (C2H5OH). ∆Hvap = 204 cal/g; MP = -114.3¢ªC , BP = 78.5¢ªC (Draw a heating curve first!)

Chemestry
Calculate the volume of a 0.225 M solution of potassium hydroxide,KOH,required to react with 0.215g of acctic acid,CH,COOH=KCH,COO+H2O.

chemestry
Please could anyone help me to give me solution of this problem: Calculate the pH of a solution obtained by mixing 50 mL of NH3 0.1 M (Kb = 1.8•10–5 mol/L) and 25 mL of HCl 0.2 M

Chemestry
If 0.25 mol of methane gas (CH4) is introduced into evacuated 2.00 L container at 35 Degrees Celcius , what is the pressure in the container ?

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