just take H2O AND CH3CH2OH as example.why say that h2o can form two hydrogen bond per molecule but CH3CH2OH only one.i am confused as both of them also has two lone pairs per molecule,is it true that one hydrogen atom will result in only one hydrogen bond and two hydrogen bond...
that means move towards or backward the object?
suppose the camera has only one len .if i want to take a sharp image of a distant object,how should the len move,forward or backward.how about if nearby object?
let x be one of the part of the string and represent ratio 3,that mean 40-2x represent ration 2 x/(40-2x)=3/2 x=15 that mean the string can be divide into 15cm, 10cm and 15cm
a^2+b^2=c^2 a,b & c are sides of a triangle note: a+b>c a+c>b b+c>a
7(41-5Y) +8Y =44 SOLVE Y AND THEN PUT Y = ? IN X=41-5Y THEN SOLVE X in fact ,purpose of substitution is to make a equation have only one unknown so that we can easily solve the problem
insufficient information,cant ans it
in fact,there are many different affect on the gas particles when heating the gas due to different condition.this is taught in a topic of gas law and kinetic theory.but simply saying,when heating a gas,the average KE OF GAS PARTICLES increase,then the average speed of each par...
S + H2SO4 ----> SO2 +H2O
thank you very much,your teaching really makes me a good start. then how about balance S +H2SO4 ---> SO2 +H2O ??