Water cycle - Water (3)Lab
| OBJECTIVES: contrasting water v hydrogenperoxide. exploring the chemistry that water. |
VOCABULARY:electron hydrogen peroxide hydrogen spirit oxygen proton water MATERIALS: lab paper hamburger meat water hydrogen peroxide
Students compare water v hydrogen peroxide.
| BACKGROUND: Water is a transparent, odorless,tasteless liquid written of the elements hydrogen and oxygen. That is avery good solvent, an interpretation that countless substances can dissolve in the easily.Water is vital to our lives, and also without the we could not live.In fact, there room no life creatures that have the right to live there is no water.It illustrates the three states of matter: heavy (ice), gas (steam),and fluid (water). |
The develops water take, relies upon the temperature.At short temperatures, the molecules carry out not move approximately as much and forma crystalline structure that is strictly (ice). In the fluid state,water molecule move much more freely. Water molecules in the type ofsteam room moving very fast with large spaces in between the molecules.Although ice cream is crystalline, it has tendency to have the molecules in a rigidstructure the is spaced farther than the molecules of fluid water andthis is quite important, for if ice cream were denser, it would certainly sink in water.Imagine what would take place if icebergs grew from the bottom of the oceaninstead the floating ~ above the surface.
Water and hydrogen peroxide room made that thesame elements: oxygen and also hydrogen. However, hydrogen peroxide(H2O2) has actually 1 an ext oxygen than water (H2O).PROCEDURE: offer students a periodictable placemat and also have them look increase hydrogen and also oxygen. Notice that hydrogenand oxygen space both gases, however yet they create water which is a liquidunder typical conditions. They have to then transfer the informationin every of the boxes on the routine table come the proper place onthe rap sheet. Make certain you point out the hydrogen has actually 1 proton,1 neutron, and 1 electron. This may be their first introduction toneutrons, protons, and also electrons, so go slowly. The student canunderstand individual instances if you go over castle carefully and also make sureyou describe as you walk over. introduce that water and also hydrogenperoxide room made the the very same elements: hydrogen and oxygen. Waterhas 2 hydrogens and also 1 oxygen, and also hydrogen peroxide has 2 hydrogens and2 oxygens. We would prefer the students come experiment v the propertiesof every of the liquids and then have actually them build an "atomic" model tosee if they can see why there is a difference. They will certainly not be ableto number this out why the various number reasons the difference, justto learn that there is a difference. In the second component of this exercisehave students look in ~ water and hydrogen peroxide. Have them answerthe questions on the rap sheet. Remember hydrogen peroxide smellsdifferent than water. Students need to smell the two liquids by usinga cupped hand to lug the odor to their nose. Perform not have actually studentsput their nose over the liquid. It likewise tastes different, however we don"trecommend that you perform this part. Also, put a drop of water,then hydrogen peroxide ~ above a tiny piece of hamburger meat. Have actually thestudents notification that hydrogen peroxide reacts v the meat and causesfizzing. Students may not realize the hydrogen peroxide is usedwhen they acquire a scrape or cut. What the hydrogen peroxide does istake the end the oxygen in the meat, causing any bacteria (that demands oxygen)to die. In exercise 3 have the student cutout the hydrogen and also oxygen atom. The black color dots represent the numberof electrons. The very first shell have the right to only organize 2 electrons. Thesecond shell deserve to only host eight electrons. Tell thestudents the the outer shell of the oxygen must have 8 electrons. Havethe students shot and figure out how to placed the atoms together to do themolecule satisfied. The reservation on the student"s lab sheet is actuallythe answer, x belongs come hydrogen and belongs to oxygen.The student will have a small trouble v this until they obtain the ideathat the external shell demands to be filled through the maximum lot of electrons.