Recent activity by HeidiWindsor

1 answer 41 views

How can inadequate preparation for chemistry exams impact a student's grades and overall academic performance? Specifically, what study methods and strategies can be employed to improve understanding and retention of key concepts in chemistry?

asked Feb 6 in Chemical education

1 answer 39 views

Calculate the standard enthalpy change for the reaction between hydrochloric acid (HCl) and ammonia (NH3) to produce ammonium chloride (NH4Cl) if the reaction is carried out in a solution of water (H2O), given the following information:HCl(aq) + H2O(l) -> H3O+(aq) + Cl-(aq) ΔH1 = -74.8 kJ/mol NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH-(aq) ΔH2 = -51.8 kJ/mol NH4Cl(s) → NH4+(aq) + Cl-(aq) ΔH3 = 15.2 kJ/mol Ensure that the answer is in kJ/mol.

asked Feb 3 in Chemical thermodynamics

1 answer 28 views

Calculate the standard enthalpy change for the dissolution of 5g of sodium chloride in 100mL of water at 25°C, given that the molar enthalpy of dissolution of NaCl is -3.9 kJ/mol.

answered Feb 3 in Chemical thermodynamics

1 answer 55 views

Calculate the amount of heat released when 10.0 g of methane (CH4) is burned completely in excess oxygen if the enthalpy of combustion of methane is -890 kJ/mol.

asked Jan 23 in Physical Chemistry

1 answer 47 views

A chemistry student is given a sample of a solution containing a known amount of sodium chloride (NaCl) dissolved in water. The student needs to determine the concentration of the NaCl in the solution, using mass balance calculations. The student has access to a balance and other necessary laboratory equipment. What is the concentration of NaCl in the solution given to the student? How much NaCl is present in the solution, and how much water was used to dissolve it?

answered Jan 22 in Analytical Chemistry

1 answer 28 views

What is the goal of the situational model of conflict resolution?

asked Jan 17 in Psychology

1 answer 11 views

Please evaluate the ethical implications of using deception in research.

answered Jan 17 in Psychology

1 answer 9 views

What is Gender Schema Theory?

asked Jan 15 in Psychology

1 answer 9 views

What is statistical significance?

asked Jan 14 in Psychology

1 answer 23 views

What are some similarities and differences between Freud's and Adler's psychoanalytic theories?

asked Jan 13 in Psychology

1 answer 24 views

Which process changes rocks by heat and pressure?

asked Jan 8 in Science

1 answer 26 views

What is it called when crystals form from magma?

answered Jan 6 in Science

1 answer 36 views

Oxygen has the second highest electronegativity of any element; consequently, it prefers to share or accept electrons from other elements. only with fluorine does oxygen form compounds in this?

answered Dec 31, 2024 in Science

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