science G8

• johann Wolfgang dobereiner 


  he proposed the law of triads
• Alexander Beguyer de chancourtois 


  he prepared the helical graph
• John Newlands 


  proposed the law of octaves
• Lothar Meyer 


  he arranged the elements according to atomic weight
• Dmitri Mendelev 


  he arranged the elements in increasing atomic mass
• Lord Rayleigh & William Ramsay 


  discovered the Noble/Inert gasses
• Henry Moseley


  arranged the elements in the periodic table according to increasing atomic number
• Glen Seaborg 


  discovered the transuranium elements with atomic numbers
• Periodical Table


  systematic arrangement of the elements in increasing atomic number and show periodicity in the physical and chemical properties
• Electronegativity


  the ability of an atom to attract an electron pair toward itself in a chemical bond
• Electron Affinity

  The energy required or released when electrons are added to an atom in the gaseous phase
• Ionization Energy

  energy that is needed to remove the valence electron
• Atomic Radius 


  One-half the distance from the two nuclei of two adjacent atoms
• noise 


  unwanted sound
• Medium 


  term given to a MATTER though which sound travels
• Work 


  is defined as force applied on an object that will move it to a distance parallel to the direction of the force
• formula of WORK


  W=F x D
• D


  Displacement
• F


  force Applied
• W


  Work
• Alimentary canal


  continuous muscular tube around 9 meters in length
• mechanical digestion 


  refers to the physical breakdown of food into smaller particles by chewing action of the teeth and churning motion of the stomach
• Chemical disgestion 


  refers to the enzymatic breakdown of the chemical bonds in larger and more complex molecules into simpler one
• tounge 


  is a muscular organ in the mouth that serve as taste or gustatory organ
• taste bud


  are receptors that are scattered all over the tongue's surface and concentrated towards the back
• five kinds of taste

  Sweet,sour,salty,bitter and umami
• common diseases of the digestive system

  diarrhea,constipation,peptic ulcer,appendicitis, and hepatitis
• Diarrhea


  one of the most common diseases of digestive system
• constipation


  When food residues move too slowly on the large intestine,excessive water absorption may occur resulting of constipation
• Peptic ulcer


  Is a shallow sore that results from the destruction of the mucous lining that covers the alimentary canal by gastric acid
• esophageal gastric or duodenal ulcer

  peptic ulcer classified
• Appendicitis


  Is the inflammation of the appendix that typically manifests with sudden pain around the navel that shifts to the lower right abdomen
• Hepatitis


  is the inflammation of the liver caused by hepatitis virus types A,B,C or E
• Hepatitis A&E Viruses


  are typically food-born
• Hepatitis B&C


  are transmitted by exposure to contaminated bodily fluids
• Jaundice


  The symptoms of hepatitis include fatigue,nausea,poor appetite,fever,and yellow coloration of the skin and eyes
• Group1A


  Alkali metals
• Group2A


  Alkali Earth metals
• Group3A


  Boron family
• Group4A


  Carbon Family