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how water acts towards fathalf-fill a tall glass jar with warm water add some olive oil or other oil to a depth of about 1 cm shake this mixture hard
how soap helps water in cleaningprepare two greasy cloths by smearing kitchen fat or vaseline on cloths wash one sample in warm water without soap
softening water with chemicals try making suds with a half test tube of hard water and a few drops of soap solution next boil a same sample and again
softening hard water by boiling temporary hardness can be removed from water by boiling shake a little temporary hard water with a few drops of soap
the difference between hard and soft water collect some hard water from a streamor make some as defined in the next experiment also secure some soft
define the mechanism of hormone actionhormones affect cell function either by activating cyclic amp adenosine monophosphate mechanism or by
how to make a simple apparatus for distilling wateryou can make a easy water-distilling apparatus from a flask and a length of glass or rubber tubing
sterilizing water by boilingthe presence of tiny living plants and animals makes water inappropriate for drinking such forms of life can only be seen
how to make an experimental biterfit a one-hole stopper carrying a short length of glass tube into the small end of a lamp chimney put a little
define protein hormone and steroid hormonefurther hormones are of two different chemical types - protein hormone and steroid hormone most of the
define general hormonesgeneral hormones on the other hand are emptied into the blood by specific endocrine glands and then flow throughout the entire
explain the local hormoneslocal hormones affect cells in the vicinity of the organ secreting the hormone what we call as paracrine influence examples
what is a hormonea hormone as you may already know can be described as a chemical substance which having been formed in one particular organ or a
how to make a filtera plant pot with a plug of cotton wool in the bottom and a layer of sand a few inches deep makes a satisfactory filter for many
lowing soap bubbles with hydrogenmix up a strong soap solution that will make good soap bubbles place a small funnel tube or a clay pipe on the
explain the olfactory receptorsin the section on taste receptors earlier we learnt that there is a regional distribution of taste buds for primary
how to prepare hydrogenhydrogen can be prepared from a dilute acid like as hydrochloric or sulphuric when it is chemically reacted with a metal like
how water can be decomposedyou will require a six-volt storage battery or accumulator or a battery of six dry cells for this interesting experiment
to study a hailstonewhen it hails collect some of the hailstones cut them in half and view how the ice of the hailstone has been built up in layers
frost in the classroomfrost can be made in the classroom by using a tall metal container like as a tin can pack the can with exchange layers of ice
explain the functions of inner earthe inner ear plays an important function in the detection of sound in the last section we left middle ear function
the rain cycleyou can reproduce the rain cycle in miniature in your classroom place a box of plant seedlings on the table place a metal tray about 35
a cloud in a bottleyou can make a cloud form in a bottle get a large glass bottle and fit with a rubber stopper carrying a 10-cm length of glass
dew-point temperatureyou can calculate the dew-point temperature with a shiny can having some water a thermometer and some ice the dew-point
the water cycleheat some water unless it is near the boiling point place it in a drinking glass and rotate the glass so as to moisten the sides right