81 Answered Questions for the topic Chemistry, Homework

10/05/18

very confusing chem question
he following reaction illustrates the decomposition of hydrogen peroxide (H2O2) to form water and oxygen gas:2 H2O2 (l) → 2 H2O (l) + O2 (g)When this reaction is carried out, 0.50 L of O2 gas is... more
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10/05/18

chemistry question
A flask contains a mixture of nitrous oxide (N2O) and oxygen (O2) with partial pressures of 425 torr and 786 torr respectively.What is the ratio of the number of moles of N2O to the number of moles... more
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09/28/18

what does it mean when we say peptide 35 or peptide2 is that the location of the amino acid
what does it mean when we say peptide 35 or peptide2is that the location of the amino acid
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09/27/18

32g c2h3o2 to mol
How am I supposed to convert, I'm so lost..
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09/26/18

How many milliliters of 0.350 M Na2S2O3 solution are needed to titrate 2.423 g of I2 to the equivalence point?
How many milliliters of 0.350 M Na2S2O3 solution are needed to titrate 2.423 g of I2 to the equivalence point?I2(aq) + 2 S2O32-(aq) S4O62-(aq) + 2 I -(aq)
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09/26/18

What is the wavelength of an electron moving at a velocity of 0.85*c where c is the speed of light?
What is the wavelength of an electron moving at a velocity of 0.85*c where c is the speed of light?
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09/26/18

How many grams of each of the following compounds are present after the reaction is complete?
Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. A solution containing 3.25 g of sodium carbonate is mixed with one containing... more
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09/25/18

Maximum number of electrons in n=5, l=4
  What is the maximum number of electrons?  n = 5, l = 4   Please explain   
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09/24/18

what is the value of k for the reaction
10.00 mol of gaseous NOBr is placed into a one liter flask at 27 c, the equilibrium concentration of NO is 2.00 mol/L. what is the value of k for the reaction 2NOBr(g) <=> 2NO(g) + Br2(g) 
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09/23/18

Percent of Oxygen in a compound
Calculate the percentage by mass of the indicated element in the following compounds:(a) oxygen in C2H5COOH. (b) oxygen in HC6H7O6. (c) oxygen in sodium sulfate.
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09/20/18

How many moles of hydrogen would be in 10.0 mL of methanol?
Methanol, CH4O is a liquid at room temperature and its density is 0.792 g/mL 
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09/11/18

Solving Law of Multiple Proportions w/ Elements X and Y
Elements X and Y form 2 compounds. 1.00 g of the first compound contains 0.33 g of X, 1.00 g of the other compound contains 0.42 g of X. Identify a plausible set of formulas.   Answer Choices:... more
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09/08/18

Hydrchloric acids
When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced.  CaCO3 + 2HCl = CaCl2 (aq) + H2O + CO2 A.)How many grams of calcium chloride will be... more
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09/05/18

How many grams of each of the following compounds are present after the reaction is complete?
Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. A solution containing 4.25 g of sodium carbonate is mixed with one containing... more
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09/05/18

Convert: 7.0 x 10^-8 m to nm
Chemistry help: Convert 7.0x 10^-8 m to nm
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08/31/18

Chemistry - Solubility Product
The solubility product of calcium sulfate is approximately as follows under the temperature conditions in question:[Ca2+ ] x [SO42- ] = 2.5 x 10–5(mole/liter)2You also have been given the following... more
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08/23/18

The density of gold is 19.33 g/cm3. If a slab of gold is found to have a total volume of 0.549 cm3, how much does the slab weigh?
The density of gold is 19.33 g/cm3. If a slab of gold is found to have a total volume of 0.549 cm3, how much does the slab weigh?
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08/22/18

What is the mass of dry precipitate actually collected?
Excess sodium Phosphate is mixed with 543.3moL of Strontium Chloride at a concentration of 0.728 mol/L. If the reactions has a 49.36% yield, what is the mass of dry precipitate actually collected?
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08/21/18

Which of the following statements is (are) correct?
I. The volume of a gas is inversely proportional to its pressure. II. The pressure of a gas is inversely proportional to its absolute temperature III. The volume of a gas is directly proportional... more
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08/21/18

According to Charles's law, which of the following will occur if the temperature of a gas is decreased?
1. The pressure of the gas will decrease   2. The pressure of the gas will increase   3. The mass of the gas will increase   4. The volume of the gas will increase    5. The volume of the... more
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08/21/18

Which of the following will increase when the temperature of a fixed amount of gas at a constant volume is increased?
I. Pressure of the gas II. Kinetic energy of molecules  III. Space between molecules    I only    II only    I and III   I and II    II and III   I think it's I and III 
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08/21/18

The mass of a fixed quantity of gas
1. Increases when the volume increases at constant temperature   2. Decreases when the absolute temperature decreases at constant pressure   3. Increases when the volume is decreased and the... more
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08/21/18

A rigid metal tank contains neon gas. Which of the following applies to the gas in the tank when some neon is removed at constant temperature?
1. The volume of the gas decreases   2. The pressure of the gas decreases   3. The average speed of the gas molecules decrease    4. The total number of gas molecules remains the same   5.... more
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08/21/18

What volume of oxygen gas at STP is required to react with 10g of potassium metal according to the following equation?
2K(s)+O2(g)=K2O(s)
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08/21/18

According to the ideal gas law
If the amount of a gas is doubled and the absolute temperature of the gas is also doubled while the volume remains unchanged, then the pressure of a gas should   a) Increase by two times b)... more
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