maths

• Area Of A Rectangle

  Length x Width

  
• Area of A Parallelogram

  Base x Height
• Area Of A Triangle

  1/2 Base x Height
• Area of a Trapezium

  1/2 (a+b) x Height
• Circumference Of A Circle

  Pi x Diameter or 2 x P x Radius

  
• Area Of A Circle

  Pi x Radius Squared

  
• Volume Of A Cuboid

  Length x Width x Height

  
• Volume Of A Prism

  Area Of Cross Section x Length
• Volume Of A Cylinder

  Pi x Radius Squared x Height

  
• Volume Of A Pyramid

  1/3 x Area Of Base x Height

  
• Equation for Speed


  Speed = Distance/Time

  
• Equation For Density


  Density = Mass/Volume

  
• Equation For Pressure


  Pressure = Force/Area

  
• Quadratic Formula

  
• Cosine Rule

  
• Area Of A triangle

  1/2 ab x SinC
• Sin


  Opposite/Hypotenuse
• Cos


  Adjacent/Hypotenuse
• Tan


  Opposite/Adjacent
• What is an atom made up of?

  Protons, Neutrons and Electrons.

  
• What charge do protons have?

  Positive

  
• What charge to neutrons have?

  neutral, no charge

  
• What charge do electrons have?

  negative
• Periodic Table

  
• Mass number

  
• What is an element?

  An element is a substance that is made up of only one sort of an atom.
• What is a compound?

  A compound is a substance made from two or more elements that have reacted chemically with each other.
• What is limestone mostly made up of?

  Calcium Carbonate (CaCO3)
• What does CaCO3 produce when it is heated?

  Calcium Oxide & Carbon Dioxide

  (CaCO3 --> CaO + CO2)
• What does Calcium Carbonate produce when it is reacted with acid?

  Calcium Salt, Carbon Dioxide & Water

  (CaCO3+H2SO4--> CaSO4+CO2+H2O)

  *the type of salt depends on the type of acid
• Calcium Oxide reacts with water to produce what?

  Calcium Hydroxide

  ( CaO + H2O --> Ca(OH)2 )
• What else can limestone be used to produce? (in industry)

  Cement, Mortar, & Concrete

  toothpaste
• What is a disadvantage to quarring limestone?

  Quarring limestone makes huge ugly holes in the landscape. Transporting the lime stone with lorries causes pollution.