Thursday
August 25, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
If each balloon is filled with carbon dioxide gas at 20 degrees C and 1 atmosphere, calculate the mass and the number of moles of carbon dioxide in each balloon at maximum inflation. Use the ideal gas law in your calculation. The volume of the balloon at maximum inflation is ...
Wednesday, January 27, 2016 by Cindy Avalos

Chemistry
If each balloon is filled with carbon dioxide gas at 20 degrees C and 1 atmosphere, calculate the mass and the number of moles of carbon dioxide in each balloon at maximum inflation. Use the ideal gas law in your calculation. Someone please let me know the answer! Thank you so...
Wednesday, January 27, 2016 by Cindy Avalos

Chemistry
I have been plagued by this question for a good half an hour, whilst doing past papers I came across it- ' EXPLAIN why the value of Kw increases as the temperature increases' as far as I can tell, it is about the excess production of OH- and H+ from le chateliers ...
Wednesday, January 27, 2016 by A

Chemistry 101
A chemist needs 2.00 grams of a liquid compound with a density of 0.785 g/cm^3 density. what volume of compund is required?
Wednesday, January 27, 2016 by Lilly

Chemistry
how do you make 400 ml pf 2 Osm solution of Mg CL2?
Wednesday, January 27, 2016 by dee

Chemistry 101
if an organic liquid has a density of 1.11 g/mL and has a measured volume of 500. mL, what mass of liquid is present?
Wednesday, January 27, 2016 by Lilly

Chemistry 101
A chemist needs 2.00 grams of a liquid compound with a density of 0.785 g/cm^3 density. what volume of compund is required? Mass= Volume X Density 2.00g x 0.785 g/Cm^3 = 1.57g/cm^3 Not sure is this is correct......
Wednesday, January 27, 2016 by Lilly

Chemistry
aCETYLENE REACTS WITH OXYGEN GAS TO PRODUCE CARBON DIOXIDE GAS AND WATER VAPOR
Wednesday, January 27, 2016 by Brandon

chemistry
if 100g of calcium carbonate on heating produces 44g of carbon dioxide,how much calcium oxide will be formed?
Wednesday, January 27, 2016 by suja

Chemistry
[10:58am]: Wn 4.5g of liquid water was formed by burning hydrogen gas in oxygen,-72kj of heat was given off.calc d standad heat formation of water
Wednesday, January 27, 2016 by Hayur

Chemistry
You have 10.5 moles of C5H12, how many moles of C do you have?
Wednesday, January 27, 2016 by cici

Chemistry
If each balloon is filled with carbon dioxide gas at 20 degrees C and 1 atmosphere, calculate the mass and the number of moles of carbon dioxide in each balloon at maximum inflation. Use the ideal gas law in your calculation. Someone please let me know the answer! Thank you so...
Wednesday, January 27, 2016 by Cindy Avalos

Chemistry
Combusting 44.8L of H2 with 22.4 L O2 (both at STP) results in the formation of 44.8 L of H2O if the reaction is maintained at the same conditions (STP) and goes to completion. Given the heat of formation of water (= -241.8 kK/mol) calculate a) the PV work b) the heat evolved ...
Tuesday, January 26, 2016 by Sanaya

Chemistry
How many moles of oxygen will be produced by 0.27 moles of potassium chlorate? 2 KCLO3 = 3 O2 + 2 KCL 0.27 x 3 O2 / 2KCL = 0.405?
Tuesday, January 26, 2016 by Boberto

Chemistry
The normal hormone adrenaline concentration (C9H13NO3) in blood plasma and 6,0x10^-8g / L. How adrenaline molecules are contained in 0.5L of plasma sanguine?
Tuesday, January 26, 2016 by Nadia

Chemistry
Write the equation for the dissolution of NH4NO3 in water. If 4.98 mol of NH4NO3 are dissolved, how many total moles of ions are produced?
Tuesday, January 26, 2016 by Hannah

Chemistry
Balance the equations for oxide reduction method: KMnO4 + KCl ---> MnCl2 + Cl2
Tuesday, January 26, 2016 by Julia

Chemistry
Consider that: the tetravalent cation of an isotope has 78 electrons and 128 neutrons; Nuclear relative mass of the same cation is 1.44% higher than the relative nuclear mass of its most common isotope based on these data, calculate the number of neutrons isotope
Tuesday, January 26, 2016 by William

Chemistry
Determine the number of grams present in 3.11x 10^23 atoms of water
Tuesday, January 26, 2016 by Carlton New England

Chemistry
What is the percentage of gas (C2H2) formed when 2.66g of calcium carbide (CaC2) reacts completely with 50g water?
Tuesday, January 26, 2016 by Bill

Chemistry
What mass of calcium carbonate reaction with hydrochloric acid yields 44L of the gas at 27 ° C and 1520 mm Hg?
Tuesday, January 26, 2016 by Nadia

Chemistry
Consider that: the tetravalent cation of an isotope has 78 electrons and 128 neutrons; Nuclear relative mass of the same cation is 1.44% higher than the relative nuclear mass of its most common isotope based on these data, calculate the number of neutrons isotope.
Tuesday, January 26, 2016 by William

Chemistry
How does the molecular wight of the gas affect the k-value?
Tuesday, January 26, 2016 by Alice

Chemistry
What is the pOH of a 0.2M buffer solution of NH 4 + 0.2M NH4NO3 at 25 ° C. PKP = 4.74
Tuesday, January 26, 2016 by Nayara

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
Tuesday, January 26, 2016 by bruge

chemistry
A gas at a temperature of 600C and 1ATM has a volume of 120 L. So what is the volume of the gas at a temperature of 400C at a constant pressure ?
Tuesday, January 26, 2016 by bruge

Chemistry
Examples of Molecules having Chiral Centres but having Achiral Structures.
Tuesday, January 26, 2016 by Minhye

Chemistry
How could I tell if an element is stable or unstable? One of the examples is 89/42 Mo The only rule I know entirely is that if the atomic number is greater then 83 then it is unstable. Thanks
Monday, January 25, 2016 by Ana

Chemistry
A car travels at 28 miles per gallon. How many kilometers will it travel per liter of gasoline?
Monday, January 25, 2016 by Micheal

Chemistry
In which of the examples is there an error in either the name OR the formula? silver(I) nitrate -AgNO3 correct iron(III) oxide - Fe2O3 correct sodium bicarbonate - Na2HCO3 - incorrect. calcium phosphate - CaPO3 in correct. rubidium phosphate - Rb3PO4 correct. strontium sulfide...
Monday, January 25, 2016 by Boberto

chemistry
If you began with 24 moles of Fe2O3, approximately how many moles of pure iron would be formed as a product?
Monday, January 25, 2016 by Boberto

Chemistry
How many grams of CO2 (Mm = 44.0 g/mol) are produced in the combustion of 31.0 g of C4H10 (Mm = 58.1 g/mol)?
Monday, January 25, 2016 by Kaitlyn

chemistry
7.20 moles of C3H8 are burned in a room with excess oxygen gas. How many moles of carbon dioxide are released into the atmosphere during this process ?
Monday, January 25, 2016 by Boberto

Chemistry
A compound on analysis as 87:8% c,12:2%h determine its empirical formular&molecular formular given mass=56gmol
Monday, January 25, 2016 by Samuel

chemistry
a 15g sample of gold-198 decays in 3g in 6 days. how much will be left after 8 days?
Monday, January 25, 2016 by chief

Chemistry
Digoxin 150 mcg is ordered IVP every a.m. The vial contains 0.5 mg in 2 mL. How many mL will you give?
Monday, January 25, 2016 by Nayara

chemistry
A gas at a temperature of 600C and 1ATM has a volume of 120 L. So what is the volume of the gas at a temperature of 400C at a constant pressure ?
Monday, January 25, 2016 by bruge

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

  1. Pages:
  2. <<Prev
  3. 16
  4. 17
  5. 18
  6. 19
  7. 20
  8. 21
  9. 22
  10. 23
  11. 24
  12. 25
  13. 26
  14. 27
  15. 28
  16. 29
  17. 30
  18. Next>>

Homework Help: Science