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The Primary Immune Response occurs at first contact with the pathogen. The body takes several days to build up a sufficient amount of antibodies . There is a three-pronged attack in response to primary expos...

Solving simultaneous equations: Example Question: Equation 1 ---> 2y – 4x = 2Equation 2 ---> 4y – 6x = 10 Find the unknown quantities, x and y. Solution: Step 1: Firstly check whether there are more th...

'ß'- examples: Sp a ß; gr o ß- the vowel before the ß, is pronounced longer 'ss'- examples: e ssen, K a sse, R u ssland, verg e ssen, b e sser- The vowel before the 'ss' is pronounced shorter It is also know...

This is a standard definition question that is relatively common in A level papers. The standar molar enthalpy change of atomisation is defined as the enthalpy change when 1 mol of an element in its standard...

Light energy from the Sun excites electrons in chlorophyll and the excited electrons are emitted.2. The chlorophyll molecule is now positively charged and chemically less stable. The lost electrons get repla...