# science, chemestry

33,142 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?

**Chemestry**

More coavalent:AlCl3 or BeCl2?

**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