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net electric force

| March 13, 2017

net electric force

three point charges are at the corners of an equilateral triangle. Calculate the net electric force on the 7.00 micro Coulomb charge

net electric force

Mathematics facts

| March 13, 2017

Mathematics facts

Mathematically, we can keep dividing a resulting number an infinite number of times. This implies that given a sample of some radioactive material, that sample will never completely disappear. True or False?

Defend your answer

Mathematics facts

change in the pH

| March 13, 2017

change in the pH

A buffer is made by adding 0.3 moles of CH3COOH and 0.3 moles of NaCH3COO to 1 liter of water.

Calculate the change in the pH of the solution when:
b. 5 mL of 4 HCl are added

change in the pH

total molar concentration of ions

| March 13, 2017

total molar concentration of ions
What is the total molar concentration of ions in each of the following solutions?

a.) 1.365M of CH3OH

b.) 0.300M of HClO4

total molar concentration of ions

Fischer Esterification

| March 13, 2017

Fischer Esterification

Benzoic acid, and excess of methanol, and some concentrated sulfuric acid are refluxed. After the reaction has been completed, the mixture is cooled down. The student observes a copious amount of white solid. Identify the solid. How should the student proceed with the experiment?

Fischer Esterification

basic chemistry

| March 13, 2017

basic chemistry
Why can’t a metal form an alloy with a non-metal?

Why don’t helium, neon, and argon (among others) form ions?

basic chemistry

Calculate the delta H

| March 13, 2017

Calculate the delta H

Use the following chemical reactions to calculate the delta H value for the following chemical reaction:

2 H2S (g) + SO2 (g) ——> 3 S (s) + 2 H2O (l) Delta H = ?? KJ

H2 (g) + 1/2 O2 (g) —-> H2O Delta H = -285.8 KJ

H2 (g) + S (s) ——> H2S Delta H = -20.6 KJ

Calculate the delta H

helium filled balloon

| March 13, 2017

helium filled balloon

Why does a helium filled balloon rise even if the helium (and balloon) are at the same temperature as the ambient air surrounding them?

helium filled balloon

the maximum number of electrons in an atom

| March 13, 2017

the maximum number of electrons in an atom
What is the maximum number of electrons in an atom that can have the following set of quantum numbers?

n = 4, l = 3, ml = -2, ms = + 1/2

the maximum number of electrons in an atom

Organic chemistry

| March 13, 2017

Organic chemistry

This question is concerning a Lab Experiment in Organic Chemistry. The lab is synthesis of benzoic acid. The question is, Do you think acetaldehyde gives a positive haloform reaction?.

Organic chemistry