bundle for AQA A Level Biology,chemistry and physics

Water removed from the reactants Condensation The addition of water to the reactants Hydrolysis Add 2cm³ of food sample (in solution). Add 2cm³ of benedict's Reagent. Heat the solution in a water bath for 3 minutes. Change from blue to brick red. CuO formed Test for Reducing Sugars Ad...

How can we make polymers more flexible? - ANSWER By adding a plasticiser How do plasticisers make polymers more flexible? - ANSWER They stick between the chains and keep the polymers further apart from each other, weakening the van der Waals forces and lets chains slide more easily. ...

Bronsted-Lowry acid - ANSWER a proton donor. Bronsted-Lowry base - ANSWER proton acceptor What is H3O+? - ANSWER hydronium ion definition of pH - ANSWER -log10[H+] How do you get [H+] from ph? - ANSWER 10^(-pH) the ionic product of water - ANSWER [OH-][H+] Is diss...

what colour is {Fe(H2O)6}2+ - ANSWER pale green Transition Metal definition - ANSWER D block elements that form at least one stable ion with a partially filled d orbital Classic elements which are not transition metals despite being D-Block elements - ANSWER Scandium and Zinc ...

What is meant by work function (2) - ANSWER Minimum energy required by an electron to escape from (1) a metal surface (1) What is meant by ionisation energy? (2) - ANSWER Minimum energy required to remove an electron from an atom (1) from the ground state (1) Why do emitted electrons...

large molecules often contain carbon. why? - ANSWER they can readily form bonds with other carbon atoms. this forms a 'backbone'. other atoms can then attach. describe benedicts test for reducing sugars - ANSWER add equal volumes of the sugar sample and benedicts reagent. heat the mixt...

Benedict's test - ANSWER Which food test is heated in a water bath? Sucrose - ANSWER Which disaccharide is not a reducing sugar? Test for non-reducing sugars - ANSWER Add acid. Neutralise. Add Benedicts. Heat. Hydrolysis - ANSWER Reaction performed by dilute HCl in the non reduci...

What does a nucleus do? - answer It contains genetic material and controls the activities of the cell What does cytoplasm do? - answer It's a gel-like substance where most of the chemical reactions happen. It contains enzymes that control these chemical reactions What does a cell me...

What is homeostasis? - answer The maintenance of a constant internal environment. What is a stimulus? - answer A change in your environment than requires a response. e.g Light, sound, touch, pressure, pain, chemical or temperature. What do the receptors do? - answer Detect the stimulus ...

sound energy - ANSWER Energy caused by an object's vibrations thermal energy - ANSWER The total energy of motion in the particles of a substance chemical energy - ANSWER A form of potential energy that is stored in chemical bonds between atoms. nuclear energy - ANSWER the pote...