Recent activity by MarcelaDeros

1 answer 39 views

Calculate the standard enthalpy change for the reaction that occurs when 4.50 grams of magnesium oxide reacts with excess hydrochloric acid, given the following information:2HCl(aq) + MgO(s) → MgCl2(aq) + H2O(l) ΔH = -120.3 kJ/molMolar mass of MgO = 40.31 g/molRound your answer to two decimal places.

answered 2 days ago in Chemical thermodynamics

1 answer 79 views

Calculate the enthalpy change for the dissolution of 5.00 g of potassium chloride (KCl) in 100 mL of water. Given that the specific heat capacity of the resulting solution is 4.18 J/g°C, and its temperature increases from 25.0°C to 30.0°C. The molar mass of KCl is 74.55 g/mol, and the enthalpy of hydration of K+ and Cl- ions is -716 and -364 kJ/mol, respectively.

asked Jan 23 in ThermoChemistry

1 answer 56 views

A chemistry student needs to determine the direction in which equilibrium will shift when the concentration of reactants in a reversible reaction is changed using Le Chatelier's principle. Given the reaction equation: 2SO2(g) + O2(g) ⇄ 2SO3(g), if the concentration of SO2 is increased, will the reaction shift to the left or right?

answered Jan 22 in Chemical reactions

1 answer 21 views

What is the cognitive-affective personality system?

answered Jan 20 in Psychology

1 answer 21 views

What does the transdiagnostic model of psychosis suggest about comorbidity?

answered Jan 20 in Psychology

1 answer 18 views

Why is Spearman's two-factor theory important?

asked Jan 20 in Psychology

1 answer 5 views

Why was the Laudanum treatment controversial?

answered Jan 17 in Psychology

1 answer 23 views

According to the terror management theory, what is the role of cultural worldview?

asked Jan 16 in Psychology

1 answer 21 views

What are externalising behaviours?

answered Jan 14 in Psychology

1 answer 31 views

What measures the amount of water in the air?

answered Jan 7 in Science

1 answer 25 views

What is the cutting and burning trees to clear land for farming called?

asked Jan 6 in Science

1 answer 27 views

The skin is a familiar organ made of what kind of tissue?

answered Jan 2 in Science

1 answer 33 views

The distance between corresponding points of adjacent waves is known as the __________

answered Dec 31, 2024 in Science

1 answer 31 views

Processes in which matter changes between liquid and solid states are freezing and?

answered Dec 31, 2024 in Science

1 answer 46 views

Electric substations have what devices, which use electromagnetic induction to increase or decrease the voltage of the current?

asked Dec 30, 2024 in Science

1 answer 39 views

Because fungi feed on decaying and dead matter, they play what important role by releasing essential elements into the environment?

answered Dec 30, 2024 in Science

1 answer 23 views

Alkenes can react with what to form alcohols?

answered Dec 30, 2024 in Science

1 answer 10 views

Contour tillage helps slow water run-off and what process that causes topsoil loss?

asked Dec 27, 2024 in Science

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