Recent activity by RozellaBranc

1 answer 32 views

Calculate the standard enthalpy change (in kJ/mol) for the reaction of hydrochloric acid (HCl) and sodium hydroxide (NaOH) to form sodium chloride (NaCl) and water (H2O), given the following balanced chemical equation:HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l)Assume the reaction takes place under standard conditions (298 K and 1 atm pressure) and that all solutions have a concentration of 1.0 M. The standard enthalpies of formation for HCl (aq), NaOH (aq), NaCl (aq), and H2O (l) are -92.31 kJ/mol, -469.14 kJ/mol, -407.76 kJ/mol, and -285.83 kJ/mol, respectively.

answered 2 days ago in Chemical thermodynamics

1 answer 48 views

Calculate the enthalpy of oxidation of methane gas ($CH_4$) when it is burned completely in the presence of excess oxygen gas ($O_2$), given that the standard enthalpy of formation of $CH_4$ is -74.8 kJ/mol and the standard enthalpy of formation of $H_2O$ is -285.8 kJ/mol.

asked Jan 23 in ThermoChemistry

1 answer 43 views

A beaker of water is placed on a hot plate, and the temperature is gradually increased. Write an equation for the rate of change of entropy with respect to time during this process, assuming the system is not in equilibrium. Use the equation to determine the rate of entropy production in the water as it is heated from 25°C to 100°C at a constant rate of 2°C/min.

asked Jan 22 in Physical Chemistry

1 answer 37 views

Where can one see object permanence in children?

asked Jan 20 in Psychology

1 answer 6 views

Where did Elizabeth Loftus conduct her research on eyewitness testimony?

asked Jan 17 in Psychology

1 answer 6 views

When might cognitive decline begin to occur in older adults?

answered Jan 17 in Psychology

1 answer 21 views

According to the cognitive model, what is the cause of depression?

answered Jan 16 in Psychology

1 answer 16 views

Who developed attachment theory?

asked Jan 13 in Psychology

1 answer 45 views

The type of vesicle transport that moves a substance out of the cell is called?

answered Jan 2 in Science

1 answer 23 views

How does deeper material cause convection in the mantle?

asked Dec 30, 2024 in Science

1 answer 26 views

Arthropods change into the adult form in a process called what?

answered Dec 30, 2024 in Science

1 answer 10 views

The medieval catapult has a heavy ballast on one end and what on the other end?

asked Dec 27, 2024 in Science

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