Extraction of Metals - Chubby Revision AS Level

Metal can't be directly removed from a sulphide - they have to be converted into oxides via Roasting Take Zinc Sulphide: 2ZnO(s) + 3O2(g) → ZnO(s) + 2SO2(g) However a pollutant - sulphur dioxide - is created, which we know from alkanes. This problem is solved by turning sulphur dioxide into sulphuric acid which is in...

Chem - Chubby Revision AS Level

Unit 1: Foundation Chemistry · Atomic Structure · Amount of Substance · Bonding · Picture · Periodicity · Introduction to Organic Chemistry · Alkanes · Unit 2: Chemistry in Action · Energetics · Kinetics · Equilibria · Redox Reactions · Group 7, The Halogens · Picture. Group 2, The Alkaline Earth Metals · The Extraction of Metals.

Group 2, The Alkaline Earth Metals - Chubby Revision AS Level

Picture. Hydroxides are Bases as are oxides. Remember that the OH ion has an oxidation state of -1. And Group 2 metal ions have an oxidation state of +2. This means the formula is M(OH)2...

Chubby Revision AS Level - Home

Chubby Revision: A level Revision for Maths, Geography, Physics, and Chemistry.

Chem/Grp7 - Chubby Revision AS Level

You remember year 8 when you learnt about metals displacing each other. This happens between halogens and halides too. Cl2 + 2NaBr → 2NaCl + Br2 The ionic equation shows chlorine being the oxidising agent. Cl2 + 2Br- → 2Cl- + Br2. Picture. This is because as you go down the group the attraction to the the outer...

Chem/Analyse - Chubby Revision AS Level

Shows you what bonds are present in a molecule. Infrared waves vary in frequency and different bonds vibrate at these frequencies. By vibrating they absorb the infrared waves. This creates an absorption spectrum. For more on infrared waves go to Waves You will get given a table that looks like this: Picture. And a table...

Chem/Periodicity - Chubby Revision AS Level

Depends on bonds; Na - Al have a sea of delocalised electrons; Silicon is covalently bonded so there are no delocalised charge carriers (although silicon is a semi-conductor); P4 and S8 are simple molecules so don't conduct; Cl is a gas so can't conduct...

Chem/Kinetics - Chubby Revision AS Level

The study of factors that affect the rate of a chemical reaction. Everything links in with itself in this chapter - read on if something is mentioned and not explained, it is later on. Collision Theory. Particles must collide before a reaction can take place. They must have the correct orientation. Particles must contain the activation...

Correlation - Chubby Revision AS Level

Variability between bivariate data (two variables) Sxx shows the variance of the variable x. Picture. Product Moment Correlation Coefficient. The PMCC is given symbol 'r' This gives a coefficient for the correlation. From -1 to 1. This enables you to see how strong a correlation there is - the further from 0 - the stronger the...

Chem/Alkenes - Chubby Revision AS Level

Alkenes are an organic molecule with the general formula CnH2n. At first glance the difference between alkanes and alkenes isn't very big but in fact that double bond makes an astronomically big difference. The difference is in the shape; remember them all the way back in Unit 1?

C2 - Chubby Revision AS Level

Algebra and Functions Simplifying Algebraic Functions Dividing polynomials by (x ± p) Factor Theorem Remainder Theorem The Sine and Cosine Rule Sine Rule Cosine Rule Area of non-right angled triangle. Exponentials and Logarithms Log Relationships Coordinate Geometry Finding the midpoint. Finding the distance...

Waves - Chubby Revision AS Level

X-rays. 10^-12 - 10^-7 m; 3x10^20 - 3x10^14 Hz; Produced by bombarding metals with high energy electrons; Detected by photographic film; Used in CT scans, X-ray photography and crystal structure analysis...

The Transition Metals - Chubby Revision A2 Level

Their electron configuration always start with 1s2 2s2 2p6 3s2 3p6. After that they contain the 3d and 4s groups. Chromium and Copper differ from the next general pattern as they only have one electron in the 4s shell unlike the other metals. Picture. In ions the 4s shell always empties before the 3d shell because it has a...

Amines - Chubby Revision A2 Level

Amines are derivatives of Ammonia (NH3). They are formed when ammonia undergoes nucleophilic substitution (from AS) with a haloalkane. This is because they contain a lone electron pair. During substitution with the right conditions the amines won't stop substituting as there is still a lone pair giving us primary,...

C1 revision (Chemistry unit 1) - SlideShare

Mar 13, 2014 ... HOW TO GET METALS • METAL ORE contains A LOT OF METAL --> Chemically combined with O2 --> have impurities • 1.CONCENTRATE ORE - remove impurities • 2. CHEMICAL REACTIONS - Remove Oxygen --> METALYAY; 15. PRICES OF METAL AND EXTRACTION • NOT WORTHWHILE to spend...

Metals are malleable. | AQA C2 | Pinterest | Aqa, Aqa chemistry and ...

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GCSE CHEMISTRY REVISION NOTES IGCSE O Level student ...

Part of DOC BROWN'S CHEMISTRY REVISION WEBSITE and also includes revision notes on 'Earth Science' and 'Radioactivity, the nature and uses of .... Group 1 The Alkali Metals, physical & chemical properties, uses and Quizzes-Worksheets section 4. ... The Mining and EXTRACTION-MANUFACTURE of METALS.

Distribution - Chubby Revision AS Level

Before you start: Drawing a diagram for each step helps you see what you are doing. In normal distribution mean, median and mode are the same and the data is symmetrical. Picture. Normally distributed data. No matter what set of numbers there are, if the data is normally distributed it will take the form of the graph above.

Maths/Logs - Chubby Revision AS Level

Chubby Revision AS Level · Home · AQA Chemistry · Unit 1> · Atomic Structure · Amount of Substance · Bonding · Periodicity · Introduction to Organic Chemistry · Alkanes · Unit 2> · Energetics · Kinetics · Equilibria · Redox Reactions · Group 7, The Halogens · Group 2, The Alkaline Earth Metals · Extraction of Metals...

Maths/Radian - Chubby Revision AS Level

A way to remember is the value you want to go to is the one on top of the fraction. For example to go to degrees you want the 180 on top. Picture. Radian's you are expected to know. Radians and Circles. Your calculator needs to be in radians. Finding the arc length rθ = l. Picture. Find the area of a segment. Picture...

Representing3 - Chubby Revision AS Level

An outlier is a value that is so out of trend it is not considered a true representation of the data. The outliers are 1.5 x IQR above Q3 or 1.5 x IQR below Q1. Picture. Histogram. The histogram gives a general shape for the data. Is used instead of a bar chart as a a bar chart can't used grouped data with differing class widths.

Algebra - Chubby Revision AS Level

Chubby Revision AS Level · Home · AQA Chemistry · Unit 1> · Atomic Structure · Amount of Substance · Bonding · Periodicity · Introduction to Organic Chemistry · Alkanes · Unit 2> · Energetics · Kinetics · Equilibria · Redox Reactions · Group 7, The Halogens · Group 2, The Alkaline Earth Metals · Extraction of Metals...

Current - Chubby Revision AS Level

Current in a metal wire is the flow of electrons. A metal is made up of an ionic lattice surrounded by a 'sea' of delocalised electrons. Electrons move about in a wire even without a power source. This travel is chaotic and has no general direction. All electron movements thus cancel all movements out meaning there is no...

Seqs - Chubby Revision AS Level

Sequence - A set of numbers governed by a rule. Series - A sequence added together. Un = dn + c n = term number, d = Common difference and c = movement. Recurrence Relationships. Relationship between two or more terms compared to all other terms E.g. Fibonacci Sequence 1,1,2,3,5,8 etc. Un+2 = Un+1 + Un when...

S1 - Chubby Revision AS Level

Modeling · Representation of Data - Location Types of Data Finding 'Averages' Linear Interpolation Coding Representation of Data - Measures of Dispersion Quartiles Percentiles Variance and Standard Deviation Coding Representation of Data Stem and Leaf Diagram Box Plot Outlier Histogram Skewness Comparing

Quantum - Chubby Revision AS Level

The photoelectric effect is when photons hit a metal passing its energy into the delocalised electrons removing them from the electrostatic forces holding them in the metal. As a photon is a quantum packet of energy as it passes its energy on it no longer exists. Only high frequencies carry enough energy to overcome the...

Chem/Redox - Chubby Revision AS Level

Redox reactions are reactions where reduction and/or oxidation occurs during the chemical reaction. Oxidation reaction is when a species: Gains Oxygen (as the name suggests); Loses Hydrogen; Loses Electrons. Reduction reaction is when a species: Loses Oxygen; Gains Hydrogen; Gains Electrons. When dealing with...

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