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27
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What is the electronegativity difference between a chlorine atom (Cl) and a sodium atom (Na)? Show your calculations and explain what this difference tells us about the type of chemical bond formed between these two elements.
answered
Feb 20
in
Chemical bonding
0
votes
27
views
Which analytical method is the best for detecting and quantifying multiple pesticide residues in food samples, and how can the data obtained be used to assess the potential health risks associated with consuming these foods?
answered
Feb 17
in
Environmental Chemistry
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30
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What factors affect the measurement of zeta potential in colloidal suspensions and how can these factors be controlled for accurate measurement?
answered
Feb 14
in
Surface Chemistry
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votes
35
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How can the lack of funding for chemistry education be addressed to ensure that students have access to quality educational resources and equipment necessary for practical learning and knowledge retention?
answered
Feb 7
in
Chemical education
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votes
119
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How can chemistry education programs increase diversity in the chemistry field to promote equity and foster innovation?
answered
Feb 4
in
Chemical education
0
votes
57
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Calculate the standard enthalpy of formation of ethane (C2H6) given the following bond energies (in kJ/mol):C-C: 347C-H: 413 Note: The equation for the formation of ethane is:C(graphite) + 3H2(g) -> C2H6(g)
answered
Feb 3
in
ThermoChemistry
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votes
76
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Calculate the amount of heat absorbed or released when 2.5 moles of sodium acetate (NaCH3COO) is crystallized from its solution at a constant temperature of 25°C. The heat of crystallization for sodium acetate is -427 kJ/mol.
answered
Jan 23
in
ThermoChemistry
0
votes
94
views
A student wants to synthesize a polymer using the monomer vinyl chloride. The reaction is exothermic and produces a polymer with an average molecular weight of 50,000 g/mol. The enthalpy change of polymerization for this reaction is -121.8 kJ/mol. How much heat is liberated during the polymerization of 1 mol of vinyl chloride?
answered
Jan 22
in
ThermoChemistry
0
votes
86
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A student needs to determine the activation energy for an electrochemical reaction involving the oxidation of Zinc using a voltage of 1.85V, a current of 0.25A and a temperature of 25°C. Given that the standard potential for this reaction at 25°C is -0.76V, what is the activation energy of the reaction?
answered
Jan 22
in
ElectroChemistry
0
votes
95
views
What is the personal fable?
answered
Jan 20
in
Psychology
0
votes
118
views
What is the nature vs. nurture debate in cognitive development?
answered
Jan 17
in
Psychology
0
votes
35
views
What is Schachter-Singer's Two-Factor Theory of Emotion?
answered
Jan 15
in
Psychology
0
votes
102
views
How does Transformational Leadership differ from Transactional Leadership?
answered
Jan 15
in
Psychology
0
votes
44
views
When did Carl Jung develop the theory of the collective unconscious?
answered
Jan 15
in
Psychology
0
votes
39
views
What is comparative psychology?
answered
Jan 14
in
Psychology
0
votes
96
views
What is the name of the psychological theory focused on positive human functioning?
answered
Jan 14
in
Psychology
0
votes
68
views
What is the definition of 'working memory'?
answered
Jan 13
in
Psychology
0
votes
83
views
What is bottom-up processing?
answered
Jan 13
in
Psychology
0
votes
84
views
While matter is recycled, ecosystems need a constant input of what?
answered
Jan 8
in
Science
0
votes
46
views
Which latitudes get the most energy from the sun?
answered
Jan 8
in
Science
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