07/23/21

What is the expected cell potentials for the following electrodes?
Cu-ZnCu-PbCu-MgZn-PbZn-MgPb-Mg
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07/22/21

Solubility question

Need help with this question with working out if possible : 2. The Ksp for lead(II) chloride is 1.6 x 10-5 . Calculate the molar solubility of lead(II) chloride  a) in pure water (3 marks)  b) in... more
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07/22/21

Chemistry: Stoirchiometry
(3.5000x10^-1) L of methane, CH4(g), is combusted with (1.40x10^-1) L of oxygen gas in SATP conditions. Once the reaction is completely finished, how many moles of the excess reagent... more
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07/22/21

Chemistry: Stoichiometry

Approximately (3.230x10^0) g of lead(II) acetate, Pb(CH3COO)2, is weighed out and placed in a (2.85x10^2) mL solution of 0.150-mol/L sodium hydroxide. Calculate the mass of precipitate produced in... more
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07/22/21

need help please
The [H3O+] in a solution of 0.18 mol/L methanoic acid is a.bcde mol/L
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07/22/21

Why do isomers have different properties let it be chemical or physical?
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07/22/21

Benzene exists as a resonance hybrid and its bonds exhibit characteristics that are halfway between single and double bonds. Resonance hybrids are best defined as
A. The average of two different structural isomers.B. Special Geometric Isomers.C. The average of two different arrangements of single and double bonds.D. The average of two different geometric... more
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07/22/21

Which of the following molecules does the carbon atoms have sp3 hybridization
Cl2COCOCS2CH2Cl2HCN
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07/21/21

Can someone please check-over my answers to these Chemistry problems?
For the following questions, use the information given below. Units of Pressure   Atmosphere (atm)   Kilopascals (kPa)     Millimeters of Mercury (mm Hg)     Torr (torr)    1.000 atm 101.3... more
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07/20/21

Chemistry 122 c
A gas has a volume of 13.7 L at a temperature of 50•C. What is the volume at 175•C! (If all other parameters are held constant?
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07/20/21

Chemistry 122 d
Calculate the [OH-] concentration for a solution where [H2O] = 4.0 x 10^-6M. Classify this solution as acidic, basic, or neutral.
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07/19/21

Chemistry 122 k
A quantity of 22.0 mL of 0.300 M sulfuric acid required 18.0 mL of a potassium hydroxide solution of unknown concentration for complete titration.a) Calculate the concentration of the potassium... more
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07/19/21

Chemistry 122 f
A quantity of 22.0 mL of 0.300 M sulfuric acid required 18.0 mL of a potassium hydroxide solution of unknown concentration for complete titration.a) Calculate the concentration of the potassium... more
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07/19/21

Chemistry 122 d
Calculate the [OH-] concentration for a solution where [H2O] = 4.0 x 10^-6M. Classify this solution as acidic, basic, or neutral.
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07/19/21

Chemistry 122 i
Calculate the mass of lead chloride that could be made when 50. mL of 0.800 M lead nitrate reacts with excess sodium chloride according to the following reaction:Pb(NO3)2(aq) + 2NaCl(aq) → PbCl2(s)... more
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07/19/21

Reaction Rate Law
A reaction rate law compares:Question 10 options: the temperature of the reactants to the rate of the reaction the surface area of the reactants to the rate of the reaction the... more
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07/19/21

Hess Law Calculations
Which of the following is NOT important when carrying out Hess' Law calculations?Question 3 options: the starting equations must add together to give the resultant equation the coefficients of... more
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07/19/21

Chemistry 122 d
A gas trapped under a piston has a volume of 1.0 L at a pressure of 850 torr. What is the volume when the pressure is 1270 torr? (If all other parameters are held constant)
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07/19/21

A liquid is exposed to infrared radiation with a wavelength of 9.70×10−4 cm.

Assume that all the radiation is absorbed and converted to heat. How many photons are required for the liquid to absorb 38.64J of heat?
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07/18/21

Are my answers to these Chemistry questions correct?
1. _______ states that for constant temperature, the product of gas volume and gas pressure always remains constant.A. Boyle’s LawB. Charles’s LawC. The Combined Gas LawD. The Ideal Gas LawE. None... more
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07/18/21

Can someone please check-over my answers to these Chemistry questions?
 The unit of pressure that represents the force exerted by the atmosphere at sea level is _______.A. 101.3 kPaB. 1.000 atmC. 760.0 torrD. 760.0 mm HgE. All of the Above 2. The units designated as... more
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07/18/21

Can someone please answer this question
Draw a correct Lewis dot structure for the following: (The way the formula is typed MIGHT give you a hint about the structure.)HCNAfter drawing the structure, answer the following questions about... more
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07/18/21

Can someone please answer this question
Write the formula of the compound based on its name. disulfur hexoxide 
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07/18/21

Can someone please answer my question?
Which of the reactions are exothermic?2Mg(s)+O2(g)⟶2MgO(s)      Δ𝐻=−1203 kJ/molNH3(g)+HCl(g)⟶NH4Cl(s)    Δ𝐻=−176 kJ/molAgCl(s)⟶Ag+(aq)+Cl−(aq)    ... more
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07/18/21

This is a regular question and is doesn't have a lab with it. Can I please get some help?
Combining 0.255 mol Fe2O3 with excess carbon produced 14.8 g Fe. Fe2O3+3C⟶2Fe+3CO What is the actual yield of iron in moles?
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