chemisry

49 results

chemisry

density and viscosity of a salicyclic acid solution

Chemisry

How many moles of oxygen are present in 8g of oxgen gas.

chemisry

When alkali metals are heated with hydrogen they form what

sds chemisry

diffren between endotermic reactin and exotermic reaction

chemisry

I am having problems with this redox question. 3 Ag2S + 2Al ---6 Ag + Al2S3 What are the charges on each;

chemisry

I am having problems with this redox question. 3 Ag2S + 2Al ---6 Ag + Al2S3 What are the charges on each;

chemisry

compare and contrast the abilities of carbon, sodium, and neon to form chemical bonds?????

chemisry

Calculate how long it will take for the conctration of SO2Cl2 in the reactor in part (a) to fall to 1/4 of its initial value.

chemisry

What is the correct way to find an equilibrium constant for the dissolution of a specific chemical at various temperatures?

chemisry

calculate the solubility of 10.1g of potassium trioxonitrate v dissolved in 50g of disstilled water at 25 degree celsius

chemisry

8. Write the structural formula of organic product that would result from the reaction: CH3—CH=CH2 + H2O->.

chemisry

Cd/Cd2+//H+/H2/Pt Write the oxidation and reductionhalf reactions. Sketch a possible deisgn cell. I am unclear on the Pt portion and the charges ?

chemisry

In order for a reaction to occur, particles must ______ in the proper _____ . What are the 2 words would be correctly fill in the blank? Thanks

chemisry

Calculate the density in g/mL {\rm g}/{\rm mL} of 2.0L {\rm L} of gasoline that weighs 1.29kg kg . Express your answer to two significant figures and include the appropriate units

chemisry

How does the precision of a calculated answer compare to the precision of the measurements used to obtain it?

Chemisry

If 125 mL of a 6.00 M KNO3 solution is diluted with 100.0 mL of water, the molarity of the resulting solution would be

Chemisry

What is the nuclear charge of S^2- ion? (mass number=32). Also calculate the number of electrons, protons, and neutrons in it.

chemisry

If you have 32g of NH3 how many moles of NH3 is that?

Chemisry

What is the minimum amount of 5.2M H2SO4 necessary to produce 22.8g of H2 (g) according to the following reaction? 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g) (Please be precise and clear)

physical chemisry

Estimate the freezing point of 150 cm3 of water sweetened with 7.5g of sucrose (C12H11O22). (Kf for water is 1.86 K kg mol-1; density of water is 1gcm-3)

chemisry

A solid metal is described as having "AN ARRAY OF POSITIVE IONS IN A SEA OF ELECTRONS". Write down the electronic structure of a magnesium atom and use it to explain what this PHRASE means? can you please help me with this question thanks

chemisry

Use the ideal gas equation to answer this question. (Recall that R is .0821 L · atm/K · mol. ) What pressure is exerted by .35 moles of a gas at 23 0 C if it is held in a container with a volume of 2.3 liters?

science help chemisry

I am doing my study guide for chem test - I cant find a good understadable answer for these 3 1. What is your definition of electrolysis? 2. How do you separate pure substances? 3. My book says mayonnaise is homogenous; teacher told the class it was heterogenous??? HELP

chemisry

2NaHCO3 --- Na2CO3 + H2O + CO2 2Fe + 6 HCl -- 2 FeCl3 + 3H2 2HBr + Ca(OH)2 -- CaBr2 + 2H2O N2 + 3H -- 2NH3 2H2O -- 2H2O + O is this a redox ? what is oxidized, reduced

Chemisry

Potassium, a silvery metal, reacts with bromine, a corrosive, reddish liquid, to yield potassium bromide, a white solid. Write the balanced equation, and identify the oxidizing and reducing agents.

Chemisry

6M HCl + 1M NaOH => NaCl + H2O If I'm understanding this correctly, all of the NaOH is used up because the molarity is 1 where the HCl's is 6 this leaves excess HCl correct?

Chemisry

The amount of I3–(aq) in a solution can be determined by titration with a solution containing a known concentration of S2O32–(aq) (thiosulfate ion). The determination is based on the net ionic equation Given that it requires 32.9 mL of 0.330 M Na2S2O3(aq) to titrate a 30.0...

chemisry

An unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 52.5 mL of 6 M HCl. Calculate the concentration of the di- luted NaOH solution. Answer in units of M

chemisry

metallic bonds are not fully broken until the metal has first melted and then boiled. the boiling points of sodium, magnesium and aluminium are 890 c 1110 c and 2470 c respectively what does this suggest about the srengths of the metallic bonds in these three elements?

CHEMISRY

While in Israel you run into a group of people who are headed for the Rocky Mountains. You have always wanted to climb to the top of Pike's Peak and decide to join them. Pike's Peak has an altitude of 4300 m. What has happened to the atmospheric pressure?

chemisry

metallic bonds are not fully broken until the metal has first melted and then boiled. the boiling points of sodium, magnesium and aluminium are 890 c 1110 c and 2470 c respectively what does this suggest about the srengths of the metallic bonds in these three elements? please ...

chemisry

Why does luis place 3 cups of water without any solute in the freezer? a. if some water spills, he will have extra b. the plain water is the control group c. he wants to know how long water takes to freeze d. the 3 cups of water are unnecessary to the experiment (b)

Chemisry

What weight of potassium chlorite is required to prepare 89.6 mL of oxygen measured over water at 21.0 degrees Celsius at 743 millimeters of mercury (mmHg). The vapor pressure of water at 21.0 degrees Celsius is 18.65 mmHg

chemisry

A 0.125 gram sample if a monoprotic acid of unknown molar mass is dissloved in water and titrated with 0.1003 MNaOH. The endpoint is reached after adding 20.77 ml of base. What is the molar mass of the unknown acid?

Chemistry

Could anyone give a web about 1.Practical arts 2.Greek theory 3.Alchemy 4.Plogiston 5.Modern Chemisry Thanks:-) These are such broad subjects. My suggestion: Go to www.google.com and type in what you want to find. You will find, literally, thousands of links. The more specific...

Chemisry

If you put copper coated penny 1983or newer, in vinegar, it turns blackish green. If you rub the copper off half the penny first and expose the zinc, put the penny in vinegar, will the results change? Thank you.

Chemisry

Use chemical principles of atomic structure and or chemical bonding to explain each of the following. 1. At 25.0 degrees C and 1atm, F2 is a gas, whereas I2 is a solid. 2. The melting point of NaF is 993 degrees C, whereas the melting point of CsCl is 645 degrees C.

chemisry.Electrochemical Measurement of Concentrat

A calibration curve to show how the cell potential varies with [Cu2+] may be constructed. A plot of cell potential (in V, with the same sense as in question 1) versus log10[Cu2+] should yield a straight line. What is the slope of this line? The answer should be -0.0591/2 but ...

Chemisry

what mass of protons would be required to just neutralize the charge of 1.0g of electrons? how do I answer this? You know the mass of an electron. Calculate how many are in 1 gram. You will need the same number of protons. Knowing the mass of a proton calculate the number ...

Chemisry

What is the % M/M concentration of 5.00 mL of methanol in 25 g solution of methanol in water? The density of methanol is 0.791 g/mL. The density of water is 1.000 g/mL. The density of the solution is 0.995 g/mL. Please show work, thank you!

CHEMISRY

A SAMPLE OF 5.5L OF ARAGON DAS IS STORED IN A SYLINDER AT A TEMPERATURE OF 32.2C AND A PRESSURE 8.42 ATM. THE SAMPLE IS TRANSFERED COMPLETELY TO ANOTHER 2.8L CYLINDER. SEVERAL HOURS AFTER THE TRANSFER THE SECOND CYLINDER HAS OBTAINED A TEMPERATURE OF 60C. WHAT IS THE PRESSURE ...

chemisry

What are the specializations of sanitary engineering? Drinking water supply Sewage Wastewater treatment 2) Name the different parts of the drinking water supply system? Production Storage Distribution 3) Which of the following three systems can be discerned when producing ...

chemisry

Q2. Distinguish between the following- 1. CH3OH and C2H5OH 2. Phenol and methanol 3. 1-Propanol and 2-Methyl-2-propanol 4. Ethenol and 1-propanol 5. Propanol and propanone 6. Acetaldehyde and benzaldehyde 7. Benzaldehyde and benzoic acid 8. Propanoyl Chloride and propanoic ...

chemisry

A 0.1 molal solution of a weak monoprotic acid was found to depress the freezing point of water 0.1930C. Determine the Ka of the acid. You can assume 0.1 molal and 0.1 molar are equivalent. 100 ml of a 0.1M solution of the above acid is titrated with 0.1 M NaOH. After an ...

Chemisry

Please mark below all of the statments that correctly describe the physical properties of glass: 1.Glasses do not have slip systems. 2.Glasses consist of both covalent and ionic bonding. 3.Glasses are brittle at room temperature. 4.Glasses are amorphous and have no long range ...

chemisry

How many grams are thee in 2.3times 10to the 23 power What units are you measuring with 2.3 * 10^23? Are they pounds, ounces, kilgromas or something else? Without this information, it is impossible to answer your question. Please repost with the needed information, so we can ...

chemisry

A technician needs to determine the concentration of lead ions in a sample of water a) Suggest a test chemical that can be added to the water sample to preciitate the lead ions. Show a chemical euation for the formation of the precipitate b) after a precipitate forms, it is ...

chemisry

Two half cells in a galvanic cell consist of one iron electroide in a solution of iron sulphate and a silver electrode in a silver nitrate solution a) Assume that the cell is operating as a galvanic cell. State the oxidation half reaction, the reduction half reaction and the ...

Chemisry

Write a balanced equation using the correct formulas and include conditions (s,l,g or aq) for each of the following reactions. 1)Carbon monoxide gas reacts oxygen gas to produce carbon dioxide gas. Express your answer as a chemical equation. Identify all of the phases in your ...

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