Questions by YYGKarry1452

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1 answer 33 views

Calculate the standard enthalpy change for the precipitation reaction that occurs when 100 mL of 0.2 M lead nitrate solution reacts with 100 mL of 0.1 M sodium iodide solution to form solid lead iodide and aqueous sodium nitrate. The balanced chemical equation for the reaction is:Pb(NO3)2(aq) + 2 NaI(aq) → PbI2(s) + 2 NaNO3(aq)Given: - Molar mass of Pb(NO3)2 = 331.20 g/mol - Molar mass of NaI = 149.89 g/mol - Density of 0.2 M lead nitrate solution = 1.055 g/mL - Density of 0.1 M sodium iodide solution = 1.04 g/mL - Specific heat capacity of the reaction mixture is 4.18 J/(g · °C) - The initial temperature of the reaction mixture and the surroundings is 25 °C.

asked 2 days ago in Chemical thermodynamics

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1 answer 75 views

What is the concentration of chloride ions present in a sample of seawater using an ion-selective electrode?

asked 6 days ago in Analytical Chemistry

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1 answer 50 views

Calculate the equilibrium constant (Kc) for the reaction: 2A(g) + B(g) ⇌ C(g) + D(g), if the concentration of A is 0.25 M, the concentration of B is 0.10 M, the concentration of C is 0.30 M and the concentration of D is 0.20 M at equilibrium.

asked Jan 23 in Chemical thermodynamics

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1 answer 18 views

According to the cognitive-behavioural model, what is the cause of eating disorders?

asked Jan 16 in Psychology

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1 answer 17 views

What is the difference between the Beck and Ellis models of CBT?

asked Jan 16 in Psychology

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1 answer 28 views

How does stimulus-response theory explain behaviour?

asked Jan 15 in Psychology

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1 answer 45 views

What is the difference between the humanistic and psychoanalytic theories of personality?

asked Jan 10 in Psychology

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1 answer 23 views

Where do sperm go after leaving the testicles and before entering the vas deferens?

asked Jan 8 in Science

+1 vote

1 answer 24 views

What carries warm or cold water throughout the world’s oceans?

asked Jan 6 in Science

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1 answer 20 views

Osseous tissue is the tissue that makes up what?

asked Dec 31, 2024 in Science

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