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Answers by MarcellaMack
0
votes
12
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What is the optimal reaction conditions, including temperature, pressure, and catalyst, required for the efficient synthesis of polyvinyl chloride from vinyl chloride monomer?
answered
3 days
ago
in
Chemical synthesis
0
votes
22
views
What is the effect of varying the molecular weight and degree of branching on the mechanical properties of a polymer and how does this relate to potential biomedical applications?
answered
4 days
ago
in
Materials Chemistry
0
votes
30
views
What is the coordination number of the europium ion in the complex [Eu(H2O)9]3+ ? How many unpaired electrons are present in the europium ion in this complex and what is its magnetic moment?
answered
6 days
ago
in
Coordination Chemistry
0
votes
33
views
Identify the type of inorganic solid that forms from the combination of Mg and Cl atoms.
answered
6 days
ago
in
Inorganic Chemistry
0
votes
32
views
How does surface modification of biomaterials affect their biocompatibility and cellular adhesion?
answered
Feb 17
in
Surface Chemistry
0
votes
39
views
How can the presence of heavy metals such as lead and mercury be detected and quantified in soil and water samples using analytical chemistry techniques, and what are the potential risks and impacts of these contaminants on human health and the environment?
answered
Feb 10
in
Environmental Chemistry
0
votes
33
views
How can chemistry students in low-resource areas access quality textbooks and resources to enhance their understanding of complex topics?
answered
Feb 5
in
Chemical education
0
votes
28
views
Calculate the standard entropy change for the reaction 2H2(g) + O2(g) → 2H2O(g) given the standard entropy values of H2(g) = 130.6 J/mol K, O2(g) = 205.0 J/mol K, and H2O(g) = 188.8 J/mol K. Also, determine whether the reaction is spontaneous or not at 298 K.
answered
Feb 3
in
Inorganic Chemistry
0
votes
49
views
Calculate the standard enthalpy change for the following reaction involving liquids at 298 K: C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l)Given the standard enthalpies of formation of C2H5OH(l), CO2(g) and H2O(l) are −277.6 kJ/mol, −393.5 kJ/mol and −285.8 kJ/mol respectively.
answered
Feb 3
in
Chemical thermodynamics
0
votes
66
views
What is the difference in reactivity between aliphatic and aromatic compounds when subjected to a nucleophilic substitution reaction? Provide specific examples of each type of compound and their expected reactions.
answered
Jan 31
in
Organic Chemistry
0
votes
75
views
What strategies can be utilized by chemistry students to increase their exposure to current research and advances in the field, particularly those who attend institutions where limited resources or opportunities for research and collaboration are available?
answered
Jan 30
in
Chemical education
0
votes
57
views
What is the concentration of iron (Fe) in a sample of river water using spectrophotometric analysis with a known calibration curve and absorbance of 0.25 at a wavelength of 510 nm? The molar absorptivity of Fe at 510 nm is 8.70 x 10^3 M^-1cm^-1 and the path length of the cuvette used is 1.0 cm.
answered
Jan 30
in
Analytical Chemistry
0
votes
97
views
What is the concentration of chloride ions (Cl-) in a water sample if the measured potential difference is -0.45V using a silver/silver-chloride (Ag/AgCl) electrode? The standard electrode potential for the half-cell reaction AgCl(s) + e- → Ag(s) + Cl-(aq) is 0.222V. The temperature of the sample is 25°C and the ionic strength is 0.1M.
answered
Jan 30
in
Analytical Chemistry
0
votes
88
views
What functional groups are present in a given organic compound and how can they be identified using infrared spectroscopy?
answered
Jan 30
in
Analytical Chemistry
0
votes
46
views
Calculate the melting point of a mixture of 1 mol of benzene and 2 mol of toluene, given that the pure components have melting points of 5.5 °C and -95.0 °C, respectively.
answered
Jan 23
in
Physical Chemistry
0
votes
54
views
Calculate the area per molecule occupied by a monolayer of n-octadecane molecules adsorbed at the air-water interface assuming a surface pressure of 20 mN/m. The molecular weight of n-octadecane is 284.54 g/mol and its molecular area in the liquid phase is 0.219 nm². Use the Langmuir adsorption isotherm equation to solve the problem.
answered
Jan 23
in
Surface Chemistry
0
votes
62
views
A chemistry student wants to design an electrochemical cell that produces a voltage of at least 1.5 volts. The available electrodes are copper and aluminum. Using Faraday's law, calculate the mass of copper needed to produce the required voltage if aluminum is used as the other electrode. The specific gravity of copper is 8.96 g/cm³, and the standard reduction potential of copper and aluminum are -0.34 V and -1.66 V, respectively.
answered
Jan 22
in
Physical Chemistry
0
votes
39
views
Why is the use of reclaimed language important in promoting self-esteem?
answered
Jan 20
in
Psychology
0
votes
64
views
What is the gender similarity hypothesis?
answered
Jan 20
in
Psychology
0
votes
42
views
Who came up with the concept of the id, ego, and superego?
answered
Jan 20
in
Psychology
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