CHEMICAL CHANGE

WHEN A PILE AMMONIUM DICHROMATE CRYSTALS IS HEATED BY A FLAME,A CHEMICAL REACTION OCCURS.HEAT,LIGHT AND GASES ARE GIVEN OFF AND MOUND OF GRAY-GREEN ASH IS LEFT BEHIND.THE ASH NOT ONLY LOOK DIFFERENT FROM THE CRYSTALS,BUT IT ALSO HAS A DIFFERENT CHEMICAL BOND OR MAKE UP.IT HAS CHANGED INTO THE SUBSTANCE CHROMIUM OXIDE.

WHAT IS CHEMISTRY?

CHEMISTRY IS THE BRANCH OF SCIENCE THAT STUDIES THE STRUCTURE OF DIFFERENT ELEMENTS AND COMPOUNDS.IT ALSO INVESTIGATES HOW THEY CHANGE AND INTERACT WITH EACH OTHER DURING PROCESSES CALLED CHEMICAL REACTIONS.THERE IS MORE TO CHEMISTRY THAN MESSY EXPERIMENTS IN LABORATORIES.DOCTORS USE IT TO FIGHT DISEASES,CHEFS USE IT TO COOK FOOD,AND FARMERS USE IT TO INCREASES THE GROWTH OF THEIR CROPS.

BRANCHES OF PHYSICS

PHYSICS EXAMINES THE BEHAVIOUR OF MATTER AND ENERGY,WHICH,TOGETHER WITH EMPTY SPACE,MAKE UP THE ENTIRE UNIVERSE.FOR THIS REASON, THE THEORIES AND METHODS OF PHYSICS CAN BE USED IN ANY AREA OF SCIENTIFIC STUDY. BIOPHYSICS - A BIOPHYSICIST STUDIES THE PHYSICAL PROCESSES AND CHANGES THAT OCCUR IN LIVING THINGS AND THE WAY THEY RESPOND STIMULI SUCH HEART AND LIGHT.ELECTRON MICROSCOPES ALLOW BIOPHYSICISTS TO SEE OBJECTS TOO TINY FOR EVEN OPTICAL TELESCOPES TO DETECT. MEDICAL PHYSICS - USING THE METHODS OF PHYSICS TO HELP DIAGNOSE AND TREAT ILLNESS IS CALLED MEDICAL PHYSICS.ONE OF THE BEST KNOWN TOOLS OF THE MEDICAL PHYSICIST IS THE CAT SCANNER,WHICH USES X-RAYS TO GIVE 3-D IMAGES OF BODY ORGANS AND TISSUES. PARTICLE PHYSICS - MATTER IS MADE UP OF MORE THAN 200 PARTICLE,INCLUDING ELECTRONS,PROTONS AND QUARKS.MACHINES CALLED BUBBLE CHAMBERS AND PARTICLE ACCELERATORS ALLOW PHYSICISTS TO STUDY THESE TINY PARTICLES AND DISCOVER NEW ONES. GEOPHYSICS - A GEOPHYSICIST STUDIES THE PHYSICAL PROCESS THAT TAKE PLACE ON AND WITHIN THE EARTH,INCLUDING ROCK FORMATION,THE EARTHS MAGNETISM,AND VOLCANOES.DEVICES CALLED SEISMOGRAPH HELP GEOPHYSICISTS TO RECORD AND EARTHQUAKES. ASTROPHYSICS - THE STUDY OF THE PLANETS,STARS AND GALAXIES THAT MAKE UP THE UNIVERSE IS CALLED ASTROPHYSICS.IT MAKES USE OF DATA COLLECTED BY TELESCOPE.COSMOLOGY IS THE PART OF ASTROPHYSICS THAT ATTEMPTS TO EXPLAIN HOW THE UNIVERSE BEGAN.

PHYSICAL CHANGES

MATTER MAY UNDERGO A PHYSICAL CHANGE IF IT GAINS OR LOOSES ENERGY AN ICE LOLLY MELTS IN THE SUN BECAUSE IT GAINS HEAT ENERGY.PHYSICAL CHANGES CAN BE REVERSED.THE QUESTION IS HOW?THE ICE LOLLY CAN BE COOLED IN FREEZER,UNTIL IT RE FREEZES.

MODERN PHYSICS

ELECTROMAGNETIC RADIATION,NUCLEAR REACTIONS,CHAOS,TIME AND SPACE,RELATIVITY ARE ALL STUDIED IN MODERN PHYSICS.CHAOS TRIES TO UNDERSTAND THE COMPLEX SYSTEMS,SUCH THE WEATHER,WHERE BEHAVIOUR SEEMS TO BE UNPREDICTABLE.CHAOS CAN BE USED TO GENERATE COMPLEX COMPUTERIZED IMAGES CALLED FRACTALS.