Thursday
May 5, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
An oxygen gas with a volume of 50 mL at a pressure of 1.5 atm . This gas is compressed up to 35 mL volume at constant temperature . Determine the final gas pressure .
Monday, January 25, 2016 by bruge

chemistry
Sulfur dioxide ( SO2 ) is a gas that causes acid rain . At the disposal of the fumes found 24 L found in the SO2 gas pressure of 200 torr . If the pressure is changed to 500 torr at a constant temperature , what is the volume of SO2 gas now ?
Monday, January 25, 2016 by bruge

chemistry
Sulfur dioxide ( SO2 ) is a gas that causes acid rain . At the disposal of the fumes found 24 L found in the SO2 gas pressure of 200 torr . If the pressure is changed to 500 torr at a constant temperature , the volume of SO2 gas berapakan now ?
Monday, January 25, 2016 by bruge

chemistry
How much energy is absorbed to change 7.25 g of ice at -3 C to 25.5C?
Monday, January 25, 2016 by chris

Chemistry
In the complete combustion of C3H8 (propane), how many liters of CO2 are produced from 10 liters of O2?
Monday, January 25, 2016 by Ellie

Chemistry 101
A sample containing 0.0750 pounds of metal pellets is poured into a graduated cylinder initially containing 22.4 mL of water. The water level rises to 31.3 mL. calculated the density of the metal.
Monday, January 25, 2016 by Lilly

Chemistry 101
Convert 115 miles to feet, inches, centimeters, millimeter, and kilometers. Show set-ups.
Monday, January 25, 2016 by Lilly

Chemistry 101
A rectangular prism measuring 12.5 in by 1.134 ft by 11.7 cm has a density of 7.89 g/cm^3. How much does the object weight in grams, kilograms, and pounds?
Monday, January 25, 2016 by Lilly

Chemistry 101
A spherical ball has a diameter of 1.00 inch and a mass of 2.00grams. Will the ball float or sink in water? Remember that if the balls's density is greater than 1.00 g?mL (the density of water), the ball will sink.
Monday, January 25, 2016 by Lilly

Chemistry 101
A student using a 100mL graduated cylinder that contained 50.00mL of water. Th volume of the water increased to 57.50mL. The density of the object was 7.85 g/cm^2. How many grams did the metal object weigh?
Monday, January 25, 2016 by Lilly

Mathematics,Science(physics,chemistry and biology)
Two similarly charged identical ping pong balls are suspended from the common support with the help of two threads.Calculate angle between the two threads and also calculate the tension in two strings.
Monday, January 25, 2016 by Shhd

chemistry
A tank volume of 40 liters containing 2.5 kg of oxygen gas at a pressure of 10 atm . How much air should be included in the tank so that the pressure to 15 atm ?
Monday, January 25, 2016 by bruge

chemistry
complete and balance chemical equation for each of the foll A CH3_CHOH_CH3 --H2SO4--> B CH3_CHBr_CH3+koH-->
Monday, January 25, 2016 by rebu

chemistry
complete and balance chemical equation for each of the foll A CH3_CHOH_CH3 --H2SO4--> B CH3_CHBr_CH3+koH-->
Monday, January 25, 2016 by rebu

chemistry
complete each of the following and name the product a CH3CH2CH=CH2+HCl gives b CH3CH2CH=CH2+Br2 gives c CH3CH2CH=CH2+H2o-H+gives d CH3CH2CH=CH2 alkalin and kMno4 gives as
Monday, January 25, 2016 by beku

chemistry
A gas has a mass compostion of 20.8% nitrogen, 25.8% oxygen, 28.4% carbon dioxide and 25 % hydrogen. Determine its average molecular weight.
Monday, January 25, 2016 by sami

Chemistry
I am stuck on b)... Reacting 1 L of H2(g) with 1 L C2H2(g) (both at STP) results in the formation of 1 L of C2H4(g) if the reaction is maintained at the same conditions (STP) and goes to completion. If this reaction produced 6.3 kJ of heat (absorbed by the surroundings), ...
Monday, January 25, 2016 by Sanaya

chemistry
In a tank volume of 50 liters of gas contained oxygen at a temperature of 57º C and a pressure of 75 atm . What is the mass of the gas ?
Sunday, January 24, 2016 by bruge

Chemistry
If you mix 50.0 mL of a 0.500 M solution of calcium nitrate with 150. mL of a 0.250 M solution of potassium nitrate, what would be the resulting molarity of nitrate ions in the final mixed solution ?
Sunday, January 24, 2016 by colin

chemistry
why is there no pop of pure oxygen and pure hydrogen?
Sunday, January 24, 2016 by alex

Chemistry
How do I convert Mol/L to Mol/mL?
Sunday, January 24, 2016 by Nayara

chemistry
what mass of lead (ii) trioxonitrate (v)will be required to yield, 22g of lead, (ii)chloride on the addition of excess potassium chloride solution
Sunday, January 24, 2016 by favour

chemistry
A certain volume of a gas at 298k is heated such that its volume and pressure are now four times their original value.what is the new temperature
Sunday, January 24, 2016 by Adams j

chemistry
A certain volume of a gas at 298k is heated such that its volume and pressure are now four times their original value.what is the new temperature?
Sunday, January 24, 2016 by Adams

Chemistry
2mole of CH3OOH and 1mole of ethanol were mixed in 1dm3 flask until an equillibrium was established.if the equillibrium constant for the reaction is 4.what is the amount of ethanoate in the equillibrium mixture?
Sunday, January 24, 2016 by Magaji

math
In a class of 50 student 28,22,20 of them offer physics,chemistry and biology respectively also,4 of them offer physics and chemistry but not biology,3 offer physic and biology but not chemistry,6 offer biology and chemistry but not physics if 13 of them offer physics only how...
Sunday, January 24, 2016 by dapo

Math
Out of 300 student in final year in senior secondary school, 200 are offering biology and the150 offering chemistry how many are offering neither biology nor chemistry
Sunday, January 24, 2016 by Emmanuel

Chemistry
concentration of ammonium chloride produced when 21.0 mL of 11.9 M HCL and 18.0mL of 7.50M NH3 are mixed?
Saturday, January 23, 2016 by Trevor

Chemistry
concentration of ammonium chloride produced when 21.0 mL of 11.9 M HCL and 18.0mL of 7.50M NH3 are mixed?
Saturday, January 23, 2016 by Trevor

Sta 112
This is my question every one . Please help me have it already I had 6 as my answer. In a class of 50 student 28,22,20 of them offer physics,chemistry and biology respectively also 4 of them offer physics and chemistry but not biology,3 offer physics and biology but not ...
Saturday, January 23, 2016 by Anonymous

Chemistry
16.6ml of a solution is run into an empty flask. the mass of the flask is 145.0 g. the mass of the flask plus solution is 158.5 g. what is the density of the solution?
Saturday, January 23, 2016 by Gabby

Chemistry
A mass of 0.100 mg TIOH is mixed with 174 ml of pure water. Calculate the pH of this aqueous solution?
Saturday, January 23, 2016 by Kelly

Chemistry
Name the element that has a density of 4.700 g/mL at STP
Saturday, January 23, 2016 by Leila

Chemistry
At stp 10 liters of N2 contains the same total number of molecules as how many liters of He.
Saturday, January 23, 2016 by Matheus

Chemistry
6g of metal M react completely with 23.66g of chlorine to form 29.66g of the metallic chloride. Find the empirical formula of the metallic chloride. (M=27,Cl=35.5)
Saturday, January 23, 2016 by Anonymous

Chemistry
A carbohydrate P contains 40% carbon,6.67% hydrogen.If P has a relative molecular mass of 60.Determine it; 1)Empirical formula 2)molecular formula [H=1,C=12,O=16]
Saturday, January 23, 2016 by Aanu

chemistry
A 43.20 mL sample of 0.3260 M sodium hydroxide (NaOH) is required to react completely with 36.70 mL of a phosphoric acid (H3PO4) solution. What is the molarity of the phosphoric acid solution?
Saturday, January 23, 2016 by T

chemistry
How does salt affect the boiling point of water? (in simple words)
Friday, January 22, 2016 by ayeza

science (chemistry)
How does salt affect the boiling point of water? (in simple words)
Friday, January 22, 2016 by ayeza

chemistry
what would be the name for these compounds? K3PO4? It's not Tripotassium phosphate. HCL? its not Hydrogen chloride.
Friday, January 22, 2016 by alex

Damon or DrBob please help..chemistry/physics
Question: 0.37 litre of an ideal monatomic gas (Cv,m = 3R/2) initially at 51 °C and 36 atm pressure undergo an expansion against a constant external pressure of 1.06 atm, and do 2.3 kJ of work. The final pressure of the gas is 1.06 atm. Calculate the change in enthalpy, &#...
Friday, January 22, 2016 by Ashley

Chemistry
On the semi - reactions below is correct to say: Li + + 1℮- => Li. Eº = -3,04V. Au 3+ + 3℮- => Au. Eº = + 1,50V. Pb 2+ + 2℮- => Pb . Eº = - 0,13V. Ag + + 1℮- => Ag. Eº = + 0,80V. a) In the semi reaction Ag, the potential ...
Friday, January 22, 2016 by Bob

Chemistry
Are the atoms in stearic acid and ammonia held together by covalent bonding?
Friday, January 22, 2016 by Anonymous

Chemistry
What is the equation for the reaction between stearic acid and ammonia?
Friday, January 22, 2016 by Anonymous

Chemistry
Nicotine is a basic substance and its dissociation constant is about 1.0 x 10-6. To prepare a solution water with 0.01 mol L-1, calculate the PH
Friday, January 22, 2016 by Alan

Chemistry
A can of soda has the total volume of 350ml. This can is open and only contains atmospheric air, and is placed within a furnace 100 ° C. After the can achieve this reduced temperature at 25 ° C. With decreasing temperature, there is a reduction of the internal pressure...
Friday, January 22, 2016 by Kelly

Chemistry
What volume of air at 1.0 atm and 25 degree Celsius must be taken to an engine to burn 1 gallon of gasoline? Assuming that: 2 C8H18 + 25 O2 --> 16 CO2 + 18 H2O provides reasonable model of the actual combustion process. ( The partial pressure of oxygen in air is 0.21 atm ...
Friday, January 22, 2016 by Monica

Chemistry
Determine the total time that must elapse until only ¼ of an original sample of the radioisotope Rn-222 remains unchanged.
Friday, January 22, 2016 by Caio

Chemistry
A certain amount of calcium reacts with water and the formed hydroxide 49g completely neutralized phosphoric acid. Calculate the volume of hydrogen obtained, at STP, and the mass of calcium.
Friday, January 22, 2016 by Jessica

Chemistry
An experiment being conducted, the pressure is 0.9 atm and the temperature is 18 ° C. One of the steps of experience requires the combustion of 500 ml of ethanol (d = 0.78 g / ml). Whereas the burning this amount of ethanol does not significantly alter the enviroments ...
Friday, January 22, 2016 by Kennia

chemistry
Ans me plxxx Identify the hydrogen bonding in DNA and ice......
Friday, January 22, 2016 by Akbar

chemistry
How would you prepare 1.000 L of a 0.200 M phosphate buffer at pH 7.02 using crystalline Na2HPO4 and a solution of 1.000 M HCl?
Friday, January 22, 2016 by tabe

Physical Chemistry - please help!
Question: 0.19 litre of an ideal monatomic gas (Cv,m = 3R/2) initially at 83 °C and 47 atm pressure undergo an expansion against a constant external pressure of 1.19 atm, and do 2.3 kJ of work. The final pressure of the gas is 1.19 atm. Calculate the change in enthalpy, &#...
Thursday, January 21, 2016 by Ashley

chemistry (moles)
2.5g of a mixture of anhydrous BaOH and BaCl2 was dissolved in distilled water and made up to 250cm3. 20cm3 of this solution required 19cm3 of 0.1moldm3 of dilute nitric acid for complete reaction. Calculate the percentage by mass of BaCl2 present in the mixture. The answer is...
Thursday, January 21, 2016 by joseph

chemistry
How would you prepare 1.000 L of a 0.200 M phosphate buffer at pH 6.90 using crystalline Na2HPO4 and a solution of 1.000 M HCl?
Thursday, January 21, 2016 by sbk2904

Chemistry
1. A graduate measured out a 100. mL hard water sample and titrated it with 37.6 mL of 0.0100 M EDTA solution for a total hardness endpoint, and 29.3 mL of 0.0100 M EDTA solution for a calcium endpoint. Calculate the molarity with respect to magnesium and calcium. Please ...
Thursday, January 21, 2016 by Adam

Chemistry
An amount of 25ml of a 0.8 Molar solution of pure KNO3 and placed in a volumetric flask. Is added water until the thin volume reaches exactly 500ml. which the final concentration?
Thursday, January 21, 2016 by Alan

Chemistry
An experiment being conducted, the pressure is 0.9 atm and the temperature is 18 ° C. One of the steps of experience requires the combustion of 500 ml of ethanol (d = 0.78 g / ml). Whereas the burning this amount of ethanol does not significantly alter the enviroments ...
Thursday, January 21, 2016 by Kennia

Chemistry
On calcination 80g of a marble were obtained 42 g of calcium oxide. The degree of purity of marble?
Thursday, January 21, 2016 by Jessica

Chemistry
how can magnesium chloride be lost in a reaction and how can we ensure that it is pure?
Thursday, January 21, 2016 by Stoof

Chemistry
What happens if we add 200 mg of calcium hydroxide in 100 g of water at 20 ° C?
Thursday, January 21, 2016 by Anna

Chemistry 101
The distance from the Earth to the sun is approximately 9.37 x 10^7 miles. How long does it take for light from the sun, to reach the earth? Speed of light is 3.00 x 10^8 m/s. Use dimensional analysis to solve.
Thursday, January 21, 2016 by Lilly

Chemistry
Calculate the equilibrium constant for the equilibrium knowing that there are 2 moles of O2 H2, 6 moles of O2 and 3 moles of H2O in a jar reactor 2L? 2 H2 + O2 = 2 H2O
Thursday, January 21, 2016 by Bill

Chemistry
An aluminum sheet used for food preservation weighs about 0.05 g/cm-2 How many electrons are in a 1 cm2 of this sheet?
Thursday, January 21, 2016 by Alan

Chemistry
Calculate the total mass of aluminum, with 90% purity, required to produce 448g of iron in the process Fe2O3 + 2 Al = Al2O3 + 2 Fe
Thursday, January 21, 2016 by Cindy

Chemistry
Consider the decomposition reaction of the following represented hydrogen peroxide: 2 H2O2 (aq) = 2 H2O + O2 In the experiment, the average speed of this reaction given time interval was 16 mol • s-¹ in relation to hydrogen peroxide. What is the average speed ...
Thursday, January 21, 2016 by Victoria

chemisty
Gary is carrying out two chemistry experiments. In experiment A he mixes hydrochloric acid with sodium carbonate. In experiment B he mixes nitric acid with copper carbonate. Explain what Gary will need to do in order to test the gas produced in each experiment. I don't ...
Thursday, January 21, 2016 by lala

Chemistry
1.How Many Grams Of Sulphur Contains The Same Number Of Moles As 4.6g Of Sodium? 2.Calculate The Number Of Moles In 28.6g Of Na2CO3.10H2O?
Thursday, January 21, 2016 by Saich

Chemistry
Ln(P2/p1)=ln(-delta Hvap/R)•(1/T1-1/t2) I have ammonia at normal boil with a temp at 39.2C find the Hvap
Thursday, January 21, 2016 by Anonymous

chemistry
how many ml of 6M HCl solution are required to bring the pH of 10 ml of a 4M NaOH solution to 2.0
Thursday, January 21, 2016 by Razakou Maman

chemistry
calculate the weight in grams far a given solution of sodium thiosulphate crystals of strength 2.0M
Thursday, January 21, 2016 by sonia

maths
in a class of 35 students twice as many study chemistry and study physics half a many study chemistry as study both subjects illustrate it on a venn diagram
Thursday, January 21, 2016 by owusu afriyie

chemistry
how to draw bicyclo 3.1.1 heptane ? I need steps to draw any of this compounds in exam ?
Thursday, January 21, 2016 by ahmed

Chemistry
1) 0.19 litre of an ideal monatomic gas (Cv,m = 3R/2) initially at 83 °C and 47 atm pressure undergo an expansion against a constant external pressure of 1.19 atm, and do 2.3 kJ of work. The final pressure of the gas is 1.19 atm. Calculate the change in enthalpy, ΔH 2...
Thursday, January 21, 2016 by Ashley

Chemistry
If a rate of 80.0 mL of an aqueous solution of potassium hydroxide concentration of 0.25 mol / L are partially neutralized by 20.0 mL of an aqueous solution of nitric acid concentration of 0.50 mol L. Determine pH of the final solution. kOH + HNO3 -> H2O + KNO3
Wednesday, January 20, 2016 by Mara

Chemistry
Which one between N2O4 and NO2 is more susceptible to decompose immediately? And why?
Wednesday, January 20, 2016 by Maude

Chemistry
What volume of air at 1.0 atm and 25 degree Celsius must be taken to an engine to burn 1 gallon of gasoline? Assuming that: 2 C8H18 + 25 O2 --> 16 CO2 + 18 H2O provides reasonable model of the actual combustion process. ( The partial pressure of oxygen in air is 0.21 atm ...
Wednesday, January 20, 2016 by Emma

Chemistry
How many grams of aluminum sulfate are produced if 15.7 g Al reacts with excess CuSO4?
Wednesday, January 20, 2016 by karen

Chemistry
What volume of air at 1.0 atm and 25 degree Celsius must be taken to an engine to burn 1 gallon of gasoline? Assuming that: 2 C8H18 + 25 O2 --> 16 CO2 + 18 H2O provides reasonable model of the actual combustion process. ( The partial pressure of oxygen in air is 0.21 atm ...
Wednesday, January 20, 2016 by Emma

Chemistry
The solidified carbon dioxide, dry ice, is used as the refrigerant to temperatures of 78 °C order What physical state of carbon dioxide at 25°C and 1 atm?
Wednesday, January 20, 2016 by Gary

Chemistry
how many L of O2 are needed to react completely with 63.0 L of H2S and STP?
Wednesday, January 20, 2016 by Lori

Chemistry
Consider the chemical reaction below equated   2N2O5 (g) -> 4NO2 (g) + O2 (g) knowing that a certain period of time, N2O5 consumption rate is 0.10 mole / s, determine for the same time interval: a) the average rate of formation of NO2 b) the average speed O2 formation
Wednesday, January 20, 2016 by Selena

Chemistry
A concentration of PCL5(g),4,0 mol/L, verifies that the process PCl5(g) = PCl3(g) + Cl2(g) is achieved with a degree of balance of 20% Calculate the equilibrium of the reaction constant
Wednesday, January 20, 2016 by Kelly

Spanish
Dr. Mario Jose Molina won the Nobel Prize in Chemistry for his work studying which problem? a. the ozone layer*** b. deforestation c. the El Nino effect d. the greenhouse effect
Wednesday, January 20, 2016 by Kaai97

Chemistry -Dr. Bob
Reacting 1 L of H2(g) with 1 L C2H2(g) (both at STP) results in the formation of 1 L of C2H4(g) if the reaction is maintained at the same conditions (STP) and goes to completion. If this reaction produced 6.3 kJ of heat (absorbed by the surroundings), calculate: a) the PV work...
Wednesday, January 20, 2016 by Sanaya

Chemistry 101
A crown is determine to weigh 2.65 kg. When this crown is submerged in a full basin of water, the overflow is found to be 145 mL. Is the crown pure gold or a gold-silver alloy? The density of silver is 10.5 g/mL and gold that of gold is 19.3 g/mL. Show work.
Wednesday, January 20, 2016 by Lilly

Chemistry-Dr. Bob
Reacting 1 L of H2(g) with 1 L C2H2(g) (both at STP) results in the formation of 1 L of C2H4(g) if the reaction is maintained at the same conditions (STP) and goes to completion. If this reaction produced 6.3 kJ of heat (absorbed by the surroundings), calculate: a) the PV work...
Wednesday, January 20, 2016 by Sanaya

Chemistry- Dr.Bob
1. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 12 psi (vs. 14.7 psi at sea level). Under those conditions and assuming T...
Wednesday, January 20, 2016 by Sanaya

Chemistry 105
How do I write 23 grams+ 0.022 grams into a significant figure?
Wednesday, January 20, 2016 by Michelle

Chemistry
Is it possible to separate Bi, Cu and Ag from a mixture containing: c(BiO+)=0,08M c(Cu2+)=0,242M c(Ag)=0,106M c(HClO4)=1M Eo Bi = 0,32 V, Eo Cu = 0,337 V, Eo = 0,792 V _______________ Using Nernst equation (E=E°-0,0592/n -logQ) i see it's possible to separate Ag, but ...
Wednesday, January 20, 2016 by Anna

Chemistry
Calculate the concentration of H+ ions of an aqueous solution of nitrous acid ( HNO2) to 0.02 mol/L knowing that the degree of ionization of acid is 3%
Wednesday, January 20, 2016 by Maria

Chemistry
A concentration of PCl5(g), 4,0 mol/L, it appears that the proceeding PCl5(g) => PCl3(g) + Cl2(g) is achieved with a degree of balance of 20%. In these conditions, calculate the value of chemical equilibrium
Wednesday, January 20, 2016 by Matt

Chemistry
Cu+HNO3-Cu(NO3)2+NO+H2O
Wednesday, January 20, 2016 by Dipesh chandak

chemistry
If the vapor pressure of a liquid is 0.850 atm at 20°C and 0.897 atm at 25°C, what is the normal boiling point of the liquid?
Wednesday, January 20, 2016 by Elisha

Chemistry
Hi, we have done an experiment in class where we have an equalibrium between (Co(H2O)6)^+2 + 4Cl^- <-> (CoCl4)^-2 + 6H2O where we added HCl dropwise until a colour change occured which changed the solution into a dark blue as the concentration of the Cholride ions ...
Wednesday, January 20, 2016 by Ivan

Chemistry- Dr.Bob!
1. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 12 psi (vs. 14.7 psi at sea level). Under those conditions and assuming T...
Wednesday, January 20, 2016 by Sanaya

Chemistry
When iron reacts with copper (2) chloride, one of two possible reactions take place: Fe(s) + CuCl2(aq) to FeCl2(aq)+Cu(s) OR 2Fe(s) + 3Cucl2(aq) to 2FeCl3(aq) + 3Cu(s)... What charge does the iron atom have carry in each of the two possible products FeCl2 vs. FeCl3.
Tuesday, January 19, 2016 by Kelly

Chemistry
I don't understand where to start first. Can you break it down for me? Ascorbic acid, also known as vitamin C, has a percentage composition of 40.9% C, 4.58% H, and 54.5% O. The molar mass of ascorbic acid is 176.1 g/mol. Determine the empirical and molecular formulas
Tuesday, January 19, 2016 by GABS

CHEMISTRY
The molar mass of benzene, an important industrial solvent, is 78.0 g/mol and its empirical formula is CH. What is the molecular formula for benzene?
Tuesday, January 19, 2016 by GABS

CHEMISTRY A
an unknown compound contains 85.64% carbon with the remainder hydrogen. It has a molar mass of 42.08 g/mol. Find its empirical and molecular formulas.
Tuesday, January 19, 2016 by GABS

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Homework Help: Science