Questions by PaulaRayner4

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1 answer 58 views

Calculate the amount of heat that needs to be absorbed to crystallize 100 grams of sodium acetate (CH3COONa) from a saturated solution at 40°C. The heat of crystallization for sodium acetate is -264 kJ/mol.

asked Jan 23 in ThermoChemistry

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1 answer 30 views

A student wants to electroplate a nickel wire with copper. The student has 1 g of copper sulfate and a 2 M solution of sulfuric acid. The wire has a surface area of 3 cm², and the desired copper thickness on the wire is 0.025 cm. How long should the student electroplate the wire with a current of 1.5 A to achieve the desired thickness of copper? Calculate the current density in the electrochemical cell.

asked Jan 22 in ElectroChemistry

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1 answer 66 views

A student needs to determine the amount of copper present in a sample of brass using coulometry. If the sample is dissolved in acid and subjected to coulometric analysis using a standard silver electrode, what is the concentration of copper (in ppm) in the brass sample?

asked Jan 22 in Analytical Chemistry

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1 answer 36 views

Why is it important to recognise and respect personal boundaries in others?

asked Jan 20 in Psychology

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1 answer 55 views

How does attention affect decision-making?

asked Jan 17 in Psychology

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1 answer 41 views

How does classical conditioning explain the development of PTSD?

asked Jan 15 in Psychology

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1 answer 30 views

When does terror management theory suggest self-esteem is important?

asked Jan 15 in Psychology

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1 answer 11 views

What was the main focus of Wundt's research?

asked Jan 14 in Psychology

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1 answer 52 views

What does the peripheral route of persuasion involve?

asked Jan 13 in Psychology

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1 answer 57 views

What part of an egg contains the genetic material ?

asked Jan 7 in Science

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1 answer 30 views

What is the shape of the thyroid gland?

asked Jan 7 in Science

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1 answer 14 views

What is found inside the pores of spongy bone?

asked Jan 6 in Science

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1 answer 31 views

What force holds planets in their orbits?

asked Jan 6 in Science

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1 answer 27 views

The elbow is an example of a what type of joint?

asked Jan 2 in Science

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1 answer 42 views

Stringed instruments can help show the relationship between tension and what in strings?

asked Dec 31, 2024 in Science

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1 answer 85 views

Dinitrophenol (dnp) is an uncoupler that makes the inner mitochondrial membrane leaky to protons. it was used until 1938 as a what?

asked Dec 30, 2024 in Science

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1 answer 34 views

Bone tissues include compact bone, spongy bone, bone marrow, and?

asked Dec 30, 2024 in Science

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1 answer 14 views

What are the three types of isomers?

asked Dec 27, 2024 in Science

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