11/19/20

HELP ME IN SCiENCE PLS
You are asked to deduce the molecular size of two liquid alkane compounds, A and B. Once ignited, compound A produces a smokier flame than compound B. Which of these two alkanes have a larger... more
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11/19/20

Molecule question
What is a molecule that has two atoms and one ring like thing in the middle?
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11/19/20

Chemistry home work

What is the mass in grams of magnesium chloride that can be produced from 6.93 miles of chlorine gas reacting with excess magnesium ?
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11/19/20

the Lewis structure
Write the lewis structure for each compound. make certain to distinguish between ionic and covalent compounds. a. BI3b. K2Sc. HCFOd. PBr3
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11/19/20

Pentane (C5H12) and hexane (C6H14) form an ideal solution. The vapor pressures of pentane and hexane at 25° C are 511 torr and 150 torr, respectively.
CHAPTER 16The mole fraction of hexane in a pentane-hexane solution is 0.50. Calculate the mole fraction of pentane in the vapor that is in equilibrium at 25°C with this solution.
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11/19/20

A KCl solution is prepared by dissolving 40.0 g KCl in 250.0 g of water at 25°C. What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg?
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11/18/20

Arrange in Increasing Ionization Energy
phosphorus, antimony, nitrogen, arsenicArrange in increasing Ionization Energy
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11/18/20

Atomic Radius Smallest to Largest
Put in order from increasing atomic radius oxygen, tellurium, selenium, polonium
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11/18/20

Calculate the decrease in temperature when 6.00 L at 293.0 °K is compressed to 4.00 L.
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11/18/20

Converting between Units of Pressure
High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The pressures used in this procedure range from around 500 kilopascals... more
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11/18/20

Calculate the heat lost by the hot water in the calorimeter

Calculate the heat lost by the hot water in the calorimeter (qhot water). for water use 1.00 g/mL as its density and 4.18 J/gK as its specific heat capacity.Mass of cold water: 50.1Temperature of... more
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11/18/20

Write the chemical name and chemical formula of the salt used to remove permanent hardness of water
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11/18/20

Which of the following describes sp3 hybridization ?
A) Three orbitals are hybridized, one p-orbital remains unhybridized.B) Three orbitals are hybridized, one s-orbital remains unhybridized.C) Three orbitals are hybridized, no orbitals remain... more
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11/18/20

According to valence bond theory, sigma bonds are_____. 
A) formed from head to head overlap of orbitals.B) never present in double bonds.C) formed only by the overlap of two unhybridized orbitals.D) formed only by the overlap of p orbitals.F) formed... more
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11/18/20

how do i find temperature number

Data Table  Initial Temperature, °C  Final Temperature, °C  Reaction 1: CaCl2 (5g) Reaction 2: CaCl2 (15g)
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11/18/20

Provide the bond type, molecular structure and intermolecular forces for NaCI, H2O and CO2. Using that information, explain why each of these are in a different phase at room temperature.
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11/18/20

I need help with chemistry heat
Methane is the principal component of natural gas, and probably the most abundant organic compound on earth. Its abundance makes it an attractive option for fuel, however, it is a potent greenhouse... more
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11/18/20

High School Chem problem
A student is given the task to determine the mass of a piece of rebar (a steel rod used for reinforcing concrete) using the method of simple calorimetry. The specific heat of steel is 0.449... more
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11/18/20

I need help with some Ap Chemistry
Nitroglycerin is a very powerful explosive which decomposes to four different gases when detonated.2C3H5(NO3)3 (l) → 3N2 (g) + ½ O2 (g) + 6CO2 (g) + 5H2O (g)(a) Calculate the ΔH° for this process... more
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11/18/20

Im stuck on a chemistry problem
Dinitrogen trioxide is the product of the reaction shown below. When dissolved in water, it forms nitrous acid, which has many applications in industrial chemistry.    NO (g) + NO2 (g) → N2O3 (g)... more
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11/18/20

Ap Chem Problem
For the boiling of methanol, CH3OH, ∆H = 37.6 kJ/mol and ∆S = 111 J/mol·K.CH3OH (l) → CH3OH (g)(a) (i) Why is the ∆H value positive for this process?(ii) Why is the ∆S value positive for this... more
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11/18/20

A chemistry problem
A chemist observes the reaction between hydrochloric acid and sodium hydroxide at 25°C.  HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l) ΔH = -55.2 kJ(a) In regards to heat, what type of reaction is... more
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11/17/20

Energy of Light
X-ray radiation falls in the wavelength region of 1.00×10-11 to 1.00×10-8 meters.What is the energy of X-ray radiation that has a wavelength of 1.00×10-11 m?Energy =  _______kJ/photon
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11/17/20

What is the molality of a solution of 31.8 g of ethanol (CH3CH2OH) in 481 mL of water if the density of water is 1.0 g/mL?
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11/17/20

What mass of carbon dioxide is produced from the complete combustion of 3.00×10−3 g of methane?
Express your answer with the appropriate units.
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