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Chemistry
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A compound being analysed has the percentage composition by mass Ca = 13.9%, W = 63.9%, O = 22.2%. Calculate the empirical formula of this compound

Using rows to represent mathematical operations and a column for each compound we can draw ourselves a table:

                             Ca       W      O
%                         13.9    ...

Answered by Haydn D. Chemistry tutor
4701 Views

Would you expect a calcium ion to be bigger, smaller or the same size as a calcium atom? Give TWO reasons to explain your answer.

Calcuim is in group two which means when it forms an ion it will donate its two outer elections, this means a calcium ion will be smaller as it has one less shell of electrons.  

Answered by Urma C. Chemistry tutor
13424 Views

State and explain the effect of the following on the rate of a reaction: a) increasing temp b) increasing pressure c) increasing concentration of ONE reactant d) adding a catalyst. In each case state what will happen to the rate constant, k.

a)         will increase

            greater collision energy

            so greater chance of activation energy being exceeded

            so greater fraction of successful collision...

Answered by Joseph P. Chemistry tutor
3795 Views

When you are given a table of half cells with values for electrode potentials, how do you find the strongest oxidising and reducing agent?

Possibly the easiest way to do this is by thinking about what the value of Electrode Potential means. The more positive the Electrode Potential, the greater the tendency of the species in the equation to ...

Answered by James S. Chemistry tutor
6262 Views

What is an acid and what is the difference between and strong and weak acid

An acid is a proton donor. The acid molecule may have one or more protons that it can lose depending on its structure, however generally the second proton is much less acidic (meaning that it is lost much...

Answered by Lea S. Chemistry tutor
2185 Views

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