Chemistry Homework Help: Answers & Questions Page 87

• Could you explain me the Rutherford alpha particle scattering experiment?

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• How can I determine the empirical formula from percent composition?

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• How many double covalent bonds are in an alkane?

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• On adding 'x' g of the solute to 100 g aqueous solution, the concentration in terms of mass by mass percentage changes from 50% to 60%. What is the value of 'x'?

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• How do intermolecular forces affect freezing point?

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• How do you calculate percent composition using gas chromatography?

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• What is the magnetic quantum number of the 19th electron of Calcium?

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• What is an example of a balancing chemical equations practice problem?

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• What is the charge on he helium atom? Explain your reasoning. (A helium atom has two electrons, two protons, and two neutrons.)

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• How does wavelength change as frequency increases?

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• What is a combustion reaction?

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• Which of the following are examples of chemical changes: melting ice by spreading salt on an icy sidewalk, striking a match, baking a cake, rubbing your hands together to get them warm, using a tea bag to make tea, and cooking a hot dog?

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• A diver breathing heliox with an oxygen composition of 5.0% wants to adjust the total pressure so that ##P_(O_2)= "0.21 atm"##. What must the total pressure be?

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• What is the equation for Dalton's law of partial pressure?

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• Calcium carbide reacts with water to produce acetylene gas. ##CaC_(2(s))+2H_2O_((l)) -> C_2H_(2(g)) + Ca(OH)_(2(g)## What volume of acetylene at 25°C and 1.01 atm is generated by the complete reaction of 2.49g of calcium carbide? What is the volume at STP...

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• How did August Kekule's discovery about carbon change the science of chemistry?

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• What intermolecular forces are present in alcohol?

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• The pH of lemon juice at 298 K is found to be 2.32. What is the concentration of ##H_3O^+## ions in the solution?

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• A solution contains 3.95g of CS2 and 2.43g CH3COCH3.vapor pressures at 35°C of pure CS2 and pure CH3COCH3 are 616 torr and 332 torr respectively.Assume ideal ,calculate vapor pressure of each component n the total vapor pressure?

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• The [CoF6]3- ion is paramagnetic, while the [Co(CN)6]3- ion is diamagnetic. Explain this observation, including reference to ligand field strengths.?

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• How does atmospheric pressure change in the troposphere?

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• Define formula unit?

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• How can I distinguish functional group region and fingerprint region in a infrared spectrum?

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• Name the class of biopolymers that contains a peptide bond?

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• How does diffusion affect dynamic equilibrium?

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• The reaction between ammonia, oxygen and methane yield Hydrogen cyanide and the other product water. If the reaction vessel contains 11.5g,12.0g,10.5g of ammonia,oxygen and methane respectively,what is the maximum mass in gram of the cyanide that could ?

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• Why does an oil-and-vinegar salad dressing have two separate layers?

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• Which is a better unit for expressing molar mass, amu or grams/mole?

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• A certain substance has a heat of vaporization of 46.34 kJ/mol. At what Kelvin temperature will the vapor pressure be 5.00 times higher than it was at 323 K? Use the Clausius-Clapeyron equation.

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• When 1 mol of NaBH4 is used to reduce ketone, how many moles of hydride is used?

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• A gas thermometer is envisaged where by the change in V is used as a measure of temp change. At 1 atm what would the change in V as 42g of nitrogen gas goes from 15 to 20C? what difficulties can you envisage in using this system to measure room temp?

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• How many moles are there in 4.25x10(23) atoms of Au? Is it 4.25x10(23) x I mol Au/6.022x10(23) = 0.71 mols Did I do that correctly?

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• You are boiling potatoes on a gas stove, and your friend suggests turning up the heat to cook them faster. Will this idea work?

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• How many elements are nonmetals on periodic table?

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• What is the unit symbol for the prefix milli?

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• What is the formula for iron(II) oxide?

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• How would you find all the isomers of the formula C4H8O2 (ester)?

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• What is a solubility graph?

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• Describe how Avogadro's number is related to a mole of any substance?

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• What is the chemical formula for magnesium bromide?

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• What does Boyle's Law state?

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• When 2 moles of potassium chlorate crystals decompose to potassium chloride crystals and oxygen gas at constant temperature and pressure, 44.7 kJ are given off. What is the thermochemical equation?

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• How do you convert 2ft, 6 in to mm?

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• How do you calculate the degree of unsaturation?

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• Is pyrene an aromatic hydrocarbon?

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• Why does ice float instead of sink?

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• How do you convert 86 degrees Fahrenheit to degrees Celsius?

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• A chunk of silver has a heat capacity of 42.8 J/°C and a mass of 181 g. How do you calculate the specific heat of silver?

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• When chlorobenzene is steam distilled at 100kPa,the boiling point of the mixture is 91°C. At this temperature,the vapor pressure of chlorobenzene is 29kPa.What is the mass of the distillate that contains 100g of chlorobenzene?

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• What is the formula for carbon monoxide?

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