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Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
describe what happen when a piece of wet red litmus paper is passed through a hydrogen gas.

Chemistry 101
A 16 Gauge wire has a diameter of 0.0508 inch. Calculate the length in meters of a 5.00 pound spool of this wire. The density of copper is 8.92g cm^-3

Chemistry 101
Which o^ these possesses more mass, a sphere of Mecury (Hg) with a diameter of 2.00 cm or a cube of lead (Pb) measuring 2.00 cm on each side? Volume of a sphere = 4/3(pie)r^3.

chemistry
describe what happen when a piece of wet red litmus paper is passed through a hydrogen gas.

Chemistry
Calculate the equilibrium concentrations of N2, H2, and NH3 present when a mixture that was initially 0.10M N2, 0.10M H2, and 0.10M NH3 comes to equilibrium at 500 degrees C. N2(g) + 3H2(g) equilibrium arrows 2NH3(g) Kc = 0.040 (at 500 degrees C)

Chemistry
At pH 9 what will the ratio of ammonium to ammonia be? The pKa of ammonium is 9.24?

chemistry help plz
A potassium permanganate solution containing 1.58g of KMnO4 per liter is added into 5 ml of an acidified iron (||) sulfate solution. Decolorizing of KMnO4 solution has been added .Calculate the mass of FeSo4.7H2O which has been dissolved in one liter of solution.

chemistry
A certain mass of gas occupied 450cm cube at 25°c.At what temperature will it have it's volume reduced half

chemistry help
A solution of thiosulfate ions has been prepared by dissolving 4.5g of Na2S2O3.5H2O in 250 ml of solution. Calculate the concentration of the thiosulfate ions S2O3^2- in the solution

chemistry
A potassium permanganate solution containing 1.58 g of KMnO4 per liter is added into 5 ml of an acidified iron (||) sulfate solution .Decolorizing of KMnO4 solution ceases when 10ml of the solution has been added. Calculate the mass of FeSo4.7H2O which has been dissolved in ...

chemistry
Tell me plz how we can characterize the compound K3[Al(c2o4)3]?

Chemistry Really Confused!!
'm confused on how to set up the problem for each question.. 1.) Calculate the empirical formula of a compound if a 6.21 g sample contains 1.67g of cerium and the remainder iodine 2.) An unknown compound contains 85.64% carbon with the remainder hydrogen. It has a molar mass ...

Chemistry
I'm confused on how to set up the problem for each question.. 1.) Calculate the empirical formula of a compound if a 6.21 g sample contains 1.67g of cerium and the remainder iodine 2.) An unknown compound contains 85.64% carbon with the remainder hydrogen. It has a molar mass ...

Chemistry
The empirical formula of an oxide of nitrogen containg 30.4 per cent of nitrogen is NO

Chemistry
sample of alumium has a mass 6.3g.calculate the number of mole of alumium present and the number of atom of alumium in the sample(AL=27

Chemistry
Which of the following compounds contains both ionic and covalent bonds? SiO2 LiCN LiI PCl3

Chemistry
Aqueous hydrobromic acid will react with solid sodium hydroxide to produce aqueous sodium bromide and liquid water. Suppose 61. g of hydrobromic acid is mixed with 41.1 g of sodium hydroxide. Calculate the maximum mass of water that could be produced by the chemical reaction

Chemistry 101
A rectangular prism has these dimensions and mass: Length = 12.6cm, width = 1.256 feet, and thickness = 456 mm. Its mass is 1.2347 pounds. Determine its density in g/cm3.

Chemistry
hellop

chemistry
which of the following has highest binding energy (nuclear chemistry) Fe-56 , O-16 , H-3 , U-235 and explain why

Chemistry
When 46.0 ml of 0.18 M HNO3 and 58.0 ml of 0.23 M LiOH are mixed, the concentration of [OH-] after mixing is ?

Chemistry
When its brakes are applied, a car moving at 10 m/s undergoes an acceleration of -1.2 m/s2. How far does the car travel before it comes to a stop?

Chemistry
In a closed container 1L of chlorine reacts with 1L of nitrogen and 1L of hydrogen. I need to give lewis structure, vsepr, box notation for valence electrons etc. (i know how to do this) But I'm doubting on what the reaction equation would be.

chemistry
why iron 56 has highest binding energy than oxygen 16 , although oxygen 16 more stable than iron 56 ???

chemistry
the half-life of tritium is 12.26 y what would be the rate of decay of tritium atoms per second in 1.00 L of hydrogen gas at STP containing 0.15% tritium atoms ?

Chemistry
Would a substance that has a granular appearance, is not soluble, melts under a bunsen flame, and does conduct as a solid or liquid have an ionic, covalent or metallic bond?

Chemistry
Would a substance that is shiny, does not dissolve in water, does not melt under a bunsen flame, and does not conduct as a solid have a covalent, ionic, or metallic bond?

chemistry
1 gm of magnesium is burnt in a closed container which contains 2 l of air at ntp containing 21 percent oxygen by volume find limiting reagent, mass of excess reagent left over, mass of mgo produced, number of mg and oh ion formed by dissolving it with water

Chemistry
A compound contains 69.9% iron and 30.1% oxygen. What is its empirical formula?

Chemistry
Why are the atomic masses of elements usually decimal numbers?

Chemistry
A student calculates the empirical formula of a compound to be C1.5H3.5. Express this as a correct empirical formula.

Chemistry
A 15.00 g chunk of lustrous silver metal is heated to 50.0 degrees C and is then placed in a coffee cup calorimeter containing 50.0 mL of water at 15.30 degrees C. After equilibrium, the water temperature is measured to be 16.56 degree C. Suggest which metal or metals could ...

Chemistry
Write a balanced chemical equation and determine the enthalpy of combustion for carbon in the diamond allotropic form. Is this the correct chemuc eq? C + O2 ----> CO2?

Chemistry
Combustion of natural gas (primarily methane) occurs in most household heaters. The heat given off in this reaction is used to raise the temperature of the air in the house. Assuming that all the energy given off in the reaction goes to heating up only the air in the house, ...

chemistry
A sample of nitrogen has a volume of 50.0L at a pressure of 760mmHg. What is the volume of the gas at each of the following pressures if there is no change in temperature? A. 1500mmHg B. 4.00 atm C. 0.500atm

Chemistry
CH4 + O2 = CO2 + H2O AND the change in heat is minus 890. Now the question is what is the energy bond of (C=O)?

chemistry
the half-life of tritium is 12.26 y what would be the rate of decay of tritium atoms per second in 1.00 L of hydrogen gas at STP containing 0.15% tritium atoms ?

chemistry
the half-life of tritium is 12.26 y what would be the rate of decay of tritium atoms per second in 1.00 L of hydrogen gas at STP containing 0.15% tritium atoms ?

chemistry
calculate the ph of a buffer solution containning 0.1M acetic acid and a 0.1M solution of sodium acetate

chemistry
the half-life of tritium is 12.26 y what would be the decay of tritium atoms per second in 1.00 L of hydrogen gas at STP containing 0.15% tritium atoms ?

chemistry
in todays experiment what length of magnesium ribbon would be required to generate 42.00 ml's of H2?

chemistry
What would be the mass ratio of Pb-208/Th-232 in a meteorite that is approximately 4.5 × 10^9 years old? The half-life of Th-232 is 1.39 x 10^10 years i'm used t= 3.32 t(1/2) logNo/N but the result is not correct !?

Chemistry
Would a substance that is shiny, does not dissolve in water, does not melt under a bunsen flame, and does not conduct as a solid have a covalent, ionic, or metallic bond?

Chemistry
The concentration of barium ions in any solution can also be determined via gravimetric analysis. An impure sample of barium nitrate with a mass of 1.234 g, is completely dissolved in water and the resulting solution is reacted with an excess of aqueous sodium sulfate. A ...

Chemistry
How many grams of iron can be recovered from 11.8 kg Fe3O4? I tried to multiply 11.8 kg by the percent composition of iron, but that didn't work.

CHEMISTRY
1.) 2 methylpropene is a compound used to make synthetic rubber. A sample of 2 methylpropene contains 0.566 g C and 0.0933 g H. Determine its empirical formula

Chemistry
In a few concise sentences, explain how you could predict the products of a chemical reaction using the reaction between sodium nitrate and magnesium phosphate as an example?

Chemistry- Dr.Bob!
Combustion of natural gas (primarily methane) occurs in most household heaters. The heat given off in this reaction is used to raise the temperature of the air in the house. Assuming that all the energy given off in the reaction goes to heating up only the air in the house, ...

Chemistry
In a few concise sentences, explain how you could predict the products of a chemical reaction using the reaction between sodium nitrate and magnesium phosphate as an example?

Chemistry
The concentration of barium ions in any solution can also be determined via gravimetric analysis. An impure sample of barium nitrate with a mass of 1.234 g, is completely dissolved in water and the resulting solution is reacted with an excess of aqueous sodium sulfate. A ...

Chemistry
Combustion of natural gas (primarily methane) occurs in most household heaters. The heat given off in this reaction is used to raise the temperature of the air in the house. Assuming that all the energy given off in the reaction goes to heating up only the air in the house, ...

chemistry
both beta and positron emission are observed for artifically produced radioisotopes of low atomic number bot only beta emission is observed with naturally occuring radioisotopes of high atomic number what is the reason ?

chemistry
isotope A require 12h for its decay rate to fall to 1/64 of its intial value . isotope B has half-life = 1.5 half life of A how long does it take for decay rate of B fall to 1/32 of its initial value ?

chemistry
A current of 5A was passed through a solution of nickel (1)(1))salt.find the time taken for 6g of nickel to be deposited

Chemistry Chemical Reactions pls help <3
2AgNO3 + CaCl2 ---> Ca(NO3)2 + 2AgCl all of the substances involved in this reaction are soluble in water except AgCl which forms a solid at the bottom of the flask . Suppose we mix together a solution containing 12.6 g of AgNO3 and one containing 8.4 g of CaCl2 .What mass ...

Chemistry
We allow 24.0 g of CH4 to react as completely as possible with excess O2, to form CO2 and H2O . Write the balanced equation for this question . What mass of O2 reacts?

Chemistry
Ionic bond sometime known as mutualism bond justify the validity of this statement

Chemistry
A 50.0g sample of copper at 10.0 C is placed in 200.0g H20 at 40.0 C in a calorimeter. Heat flows from the water to the copper until both are at 39.3 C. What is the specific heat of copper? (Csp H20 is 4.18J/g*C.) I don't have any idea how to do this problem. If someone could ...

Chemistry
Are the bonds for these substances correct? Sodium chloride - ionic Sucrose - covalent Copper - metallic Calcium chloride - ionic Carbon - covalent Mercury - ionic Naphthalene - covalent Are any of these substances not strictly ionic, covalent, or metallic?

chemistry
what are the step by step methods that are required in adding Na2CO3 to a tank of water ?

Chemistry
How many molecular does 36.0 grams of water represent?

chemistry
What mass of carbon dioxide can be produced from 4 moles of sodium bicarbonate according to the following unbalanced reaction, NaHCO3 --> Na2CO3 + CO2 + H2O?

chemistry
an ezyme -catalysed reaction was carried out in a solution buffered with 0.05 M phosphate ph 7.2 . As a result of the reaction ,0.06M of acid was formed. (phosphoric acid has three pka values. The one required for this calculation is pka2=7.2). 1) what was the pH at the end of...

Chemistry
An ion of sulfur has a smaller atomic radius than a neutral atom of sulfur because it loses an electron when becoming an ion. True or False?

chemistry
can someone explain to me what happens when zinc and copper sulfate react? I know its a redox reaction and it gives off heat making it exothermic, but don't know whats actually happening in that reaction. can someone explain to me that reaction?

Chemistry
What mass of sulfur must be used to produce 12.6L of sulfur dioxide (SO2) at STP? S8 + O2  SO2

Reposting chemistry help!!!
A metal x forms two different chloride.if 12.g of chloride A and 16.3g of chloride B contain 7.1g and 10.7g of chlorine respectively,show that the figure agree with the laws of multiple proportions.write there formulea plz i need the working.....

chemistry
how many liters (at STP) of chlorine gas are required to produce .050L of hydrogen chloride gas?

Chemistry
What does potassium nitrate form when it decomposes

Chemistry chlorine plz help
A metal x forms two different chloride.if 12.g of chloride A and 16.3g of chloride B contain 7.1g and 10.7g of chlorine respectively,show that the figure agree with the laws of multiple proportions.write there formulea plz i need the work....no hint plz

chemistry
Calcium carbonate was reacted with hydrogen chloride. What is the percentage yield of carbon(iv)oxide produced if 3.65g of the gas is collected when 10g of calcium(iii)oxocarbonate reacts

Chemistry
pepe is tasked with carefully measuring precisely one mole of aluminum. How should pepe go about completing this assignment?

chemistry
What is the percentage by mass of sodium (Na) in a formula unit of sodium hydrogen carbonate (NaHCO3)?

chemistry
If I wanted to make two solutions. In one I will mix Chemical A into 1 Liter of water. In the second I will mix Chemical B into 1 Liter of water. If I want my two solutions to be the same concentration they should contain the same number of PARTICLES. How can I make sure both ...

Chemistry
Part 1 : a.) How many grams of Hydrogen will be contained in a 100.000 g sample of magnesium hydroxide.? c.) How many grams of nitrogen will be contained in a 120.0 g sample of calcium cyanide? ________________________________________​ Part 3: d.) How many grams of ...

Chemistry
I'm confused on how to do these. Please show and explain how to do these. Test/quiz may be tomorrow. Pop Quiz!!! How do you calculate the percent composition of each of the following compounds? a.) Magnesium hydroxide b.) Calcium Cyanide c.) Nickel (ii) Iodide d.0 Copper (i) ...

Chemistry
Why does magnesium burn with a white flame? What does it say about the electron transitions that take place?

math/ chemistry
so I have this chemistry problem which involves math and basically I need to convert 62 g/mol into mol/L but I don't know how. like do you DIVIDE the g/mol by 1000 to convert g to L? and then how to you get the mol to become the numerator?

Chemistry
One atmosphere of pressure will push a column of mercury to a height of 760 mm when the closs sectional area of the column is 1.00 cm.what would be the height of the column of mercury supported by the atmosphere if its cross sectional area were 0.500cm? How High would the ...

Chemistry-Dr.Bob
You are at your cabin in the woods. Will you be able to take a hot bath tonight if only 0.1 lb of propane remains in the tank? Explain. My answer: No, I will not be able to take a hot bath. By making assumptions and approximations, I got... energy released for combustion is ...

Chemistry-Dr.Bob
Why is gasoline (octane) better than diesal (cetane)?

chemistry
A 20.00 g sample of metal is warmed to 165˚C in an oil bath. The sample is then transferred to a coffee cup calorimeter that contains 125.0 g of water at 5.0˚C. The final temperature of the water is 8.8˚C. mrtal water m=20g m=125g t1=165c t1=5 c=? t2=8.8 c...

Chemistry
What is the chemical symbol for dihydrogen monoxide? I heard from the classmates and they laughed at each other. I can't understand!!

chemistry
A flask containing 200 mL of solution is labeled 0.300 M CuBr2. A sample containing 0.0500 moles of Br− is added to the solution. What is the molarity of the Br− ion solution? Assume no volume change. a) 0.850 M b) 0.667 M c) 1.10 M d) 1.00 M e) 0.400 M

Chemistry
In what part of the electromagnetic spectrum would transition lines of n = 7 be expected to be found?

Chemistry
Can a flame test and emission spectrum test be used to identify a mixture with two or three elements?

Chemistry
Why can't a single spectral line be used to identify an element?

Chemistry-Dr.Bob
Since most chemical reactions are conducted in containers open to the armisphere, why is the energy transfer associated with a chemical reaction generally expressed as the change in enthalpy? Is it because the enthalpy of reaction measures the change in energy of a chemical ...

chemistry
A lighter contains 3.59 g of butane. How many moles of butane are present at STP? Thoughts: So, correct me if I'm wrong however is it appropriate just to calculate its molar mass, and then use that molar mass and the given mass to figure out moles??

Chemistry
In the lab, 5.8 L of methane gas is burned with excess oxygen gas at SATP. How much carbon dioxide gas is produced? **Based on the balanced chemical equation the ratio of methane gas to carbon dioxide is 1:1, this being said, does it make sense that as 5.8 L of methane gas is ...

chemistry
How many formula units are in 1.31 mg of hydrogen peroxide (H2O2)? Answer in units of formula units. For 508 g of butadiene (C4H6) calculate the number of moles. Answer in units of mol. Calculate the number of molecules. Answer in units of molec. 016 1.0

chemistry
How many molecules are in 24.0 g NO2? Answer in units of molec.

chemistry
How many molecules are in 0.0700 mol NH3? Answer in units of molec.

chemistry
How many molecules are contained in 1.30 mol O2? Answer in units of molec.

chemistry
How many grams do 6.2×1024 atoms of argon weigh? Answer in units of g.

Chemistry
Is this equation for acetic acid + sodium chloride balanced? C2H4O2 + NaCl ---> HCl + C2H3NaO2

chemistry
calculate the concentration of potassium in grams per liter after mixing 100ml of 0.250m and 200ml of 1.00m k2s04

chemistry
Mno4- + So3-2 = Mno2 + sO4-2 (in neutral solution,but H+ ions will appear in the final question) solve this redox reaction and give me the method also Thank you

Chemistry
Salts of barium, barium sulfate Particularly, When applied orally and because of its low solubility (Ksp = 1 x 10 ^ -10) Increase contrast for X-rays in medical diagnosis of the digestive system. Considering que Were reacted 7 × 10 -5 moles of CaCl2 with an equivalent amount ...

Chemistry
Salts of barium, barium sulfate Particularly, When applied orally and because of its low solubility (Ksp = 1 x 10 ^ -10) Increase contrast for X-rays in medical diagnosis of the digestive system. Considering que Were reacted ^ 7 × 10 -5 mol of CaCl2 with an equivalent amount ...

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