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Explain the nuclear model

The atom consists of three sub-atomic particles: Protons; Neutrons and electrons. Protons and neutrons are in the nucleus of the atom and the electrons occupy the electron shells around the nucleus.

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Answered by Emily P. • Chemistry tutor

20195 Views

Georgia has a bucket of sandy sea water, and wants to separate it out into it's components: sea-salt, water and sand. What steps should she take to achieve this? How can she check at the end that the water is pure?

First, she should filter the mixture using a filter funnel and filter paper to remove the sand. Then, she should distill the remaining solution, using a bunsen burner, a distillation column and a condensi...

Answered by Nikhil B. • Chemistry tutor

8386 Views

Write a balanced equation for the reaction of calcium hydroxide with nitric acid.

Ca(OH)2 + 2HNO3 --> Ca(NO3)2 + 2H2O

Answered by Jonathan C. • Chemistry tutor

36211 Views

Construct expressions for pH, Kw and Gibbs Free energy

pH=-log[H+] Kw=[H+][OH-] GFE=enthalpy-(temp*entropy)

Answered by Joe D. • Chemistry tutor

4566 Views

Why can endothermic reactions occur spontaneously if the entropy change is negative for a cooling process?

An endothermic process is one which cools as the reaction proceeds meaning that the entropy change of the reaction will be negative. These reactions may still be feasible as the spontaneous nature of a re...

Answered by Eve R. • Chemistry tutor

17296 Views