Physical Chemistry Answers

When methane is burned with oxygen, the products are carbon dioxide and water. If you produce 9 grams of water and 11 grams of carbon dioxide from 16 grams of oxygen, how many grams of methane were needed for the reaction?

A certain gas has a volume of 850 ml at an initial temperature of 30. later this gas is heated to a temperature of 8.

1st energy level= -5 * 10^-18 J
2nd energy level= -6 * 10^-19 J
3rd energy level= -2 * 10^-19 J

A photon with energy = 4.4 * 10^-18 J interacts with the atom. What might happen as a result?

1. none
2. transit from 2nd to 3rd
3. transit from 1st to 2nd
4. transit from 1st to 3rd

The reactor core needs to stay at or below 95°C to remain in good condition. Cool water at a temperature of 10°C is used to cool the reactor if the reactor emits 210,000 kJ of energy each hour how many grams of water need to be circulating each hour in order to keep the reactor at or below 95°C?

2NaHCO(3) → Na(2)CO(3) + CO(2) + H(2)O ... [ the parenthesis mean its a subscript ] .. Which one is the reactant and which one is the product?

Is Conductivity is the ability of matter to cool down. True or false?

How moles of oxygen are there in 50L tank at 21 c when the oxygen pressure is 15.7atm?

Define
Antiseptics

1) Indicate the conjugate acid-base pairs in the following reactions.

a) CN- + H2O ↔ HCN + OH-
b) NH4 + H2O ↔ NH3 + H3O+

What must occur when an electron in an atom returns from a higher energy state to a lower energy state?