Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Chemistry 2.6

AS edexcel chemistry - redox

What is a redox reaction and a disproportionation reaction? Redox - where one substance is oxidised and the other is reduced. Disproportionation - a redox reaction where an element in a single species is simultaneously oxidised and reduced
What is reduction and oxidation? Reduction - the loss of oxygen, the gain of hydrogen, the gain of electrons (RIG). Oxidation - the gain of oxygen, combustion, the loss of hydrogen, the loss of electrons (OIL)
What is an oxidising agent? An agent that oxidises another species by removing electrons, and the agent is simultaneously reduced
What is a reducing agent? An agent that reduces another species by donating electrons, and the agent is simultaneously oxidised
How do you complete complex and simple half equations and turn them into full ionic equations? Balance atoms and charges. Include state symbols. Simple: balance just with electrons. Complex (acid): balance O with H2O, balance H with H+, balance charge with e-. Ensure number of electrons in half equations are equal before adding
What is oxidation number? The formal number of electrons gained or lost by an atom of an element in a compound if the compound is considered to be wholly ionic
What does an increase/ decrease in oxidation number mean? Increase - substance has been oxidised, decrease - substance has been reduced
What are the rules of oxidation numbers? Uncombined element=0. Monatomic ion=charge on ion. Sum in a neutral compound=0. Sum in a polyatomic ion=charge on ion. Group 1 = +1. Group 2=+2. F=-1. H= +1 (except with a metal). O=-2 (except superoxide, peroxide or with fluorine)
What are some steps to remember with oxidation numbers? Ignore stoichiometry, oxidation numbers can be fractions, give the sign then the number
What are the oxidation numbers of the elements in: (NH4)2Cr2O7 N= -3. H=+1. Cr = +6. O = -2
What are the oxidation numbers of the elements in: NaOH Na = +1. O = -2. H = +1
What is the number of electrons in a half equation equal to? The change in oxidation number of the element
What are some real -life examples of oxidation and reduction? Aerobic respiration: oxygen reduced from 0->-2. Rusting: oxygen reduced from 0->-2, iron oxidised from 0->2. Combustion: oxygen is reduced, other reactant is oxidised. Batteries: Zn+CuSO4->ZnSO4+ Cu. displacement reaction, Zn oxidised, Cu reduced
What is the half equation for NO3- -> NO2- NO3 - + 2H+ + 2e -> NO2- + H2O
Created by: 11043