J.R. S.

The combustion of 1.899 g of phenol, C6H5OH(s), in a bomb calorimeter with a heat capacity of 4.80 kJ/°C results in an increase in the temperature of the calorimeter and its contents from 22.70 °C... more

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Chemistry

05/12/19

limiting reagent problem

Pure magnesium metal is often found as ribbons and can easily burn in the presence of oxygen. When 4.69 g of magnesium ribbon burns with 8.72 g of oxygen, a bright, white light and a white, powdery... more

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Chemistry

05/12/19

What is the base dissociation constant for a 0.024 M basic solution that has a pH of 11.2 ?

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Chemistry

05/12/19

What is the acid dissociation constant for a 0.0250 M monoprotic acid when [H+] = 4.5x10^-5 ?

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Chemistry

05/11/19

Cell Notation and Oxidation

Consider a cell based on the following half- reactions:Au+3 + 3e− →Au ε° = 1.50 VFe+3 + e− →Fe+2 ε° =0.77 Va.)Write the cell notation (being sure to put the anode on the left and cathode on the... more

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Chemistry

05/11/19

Original Concentration of Ag+

It took 2.30 min using a current of 2.00 A to plate out all the silver from 0.250 L of a solution containing Ag+. What was the original concentration of Ag+ in the solution?

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Chemistry

05/11/19

What Mass of Hf?

What mass of Hf can be produced from aqueous Hf+4 in 1.0 hr with a current of 15 A?

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Chemistry

05/11/19

What mass of Co?

What mass of Co can be produced from aqueous Co+2 in 1.0 hr with a current of 15 A?

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Chemistry

05/11/19

Electrolysis Creating Bismuth

The electrolysis of BiO+ produces pure bismuth. How long would it take to produce 10.0 g Bi by the electrolysis of a BiO+ solution using a current of 25.0 A?

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Chemistry

05/11/19

Balance Equation and Determine Cell Potential

Give the overall balanced equation, and determine the cell potential for the following cell. Determine if the the reaction occurs spontaneously.Mn+2 +2e− →Mn ε°=−1.18 VFe+3 +3e− →Fe ε°=−0.036 V

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Pharmacology Neuroscience Neurotransmitter

05/11/19

Why do antidepressants have a delayed onset of action?

Why do antidepressants take so long to reach efficacy? I've read of theories about it perhaps being due to the strength of negative feedback via serotonergic and adrenergic autoreceptors during the... more

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Chemistry Thermodynamics

05/10/19

Need help with my question in chemistry

Calculate the ΔH of 200ml 1M HI acid mixed with 100ml 2M KOH solution?ΔHf KI/H2O= -57.5 KJ/Moleanswers:a - 11.5 KJb - 10.5 KJc - 12.5 KJd - 9.5 KJThanks.

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Chemistry Organic Chemistry

05/10/19

Name the product(s) that are produced and classify the reaction?

hydrogen bromide + pent-2-ene → type of reaction: (addition, substitution, elimination?)

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Chemistry

05/09/19

I need help on Chemistry

In the important industrial process for producing ammonia (the Harber Process), the overall reaction is: N2(g) + 3H2(g) --> 2NH3(g) + 100.4 kJ A yield of NH3 of approximately 98% can be obtained... more

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Chemistry Stoichiometry

05/09/19