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1 what is a sign for the thermochemical process of melting nacl2 150 g sample of metal at 80oc added to 150 g of h2o at
a two lenses separated by a distance of 221 cm are used in combination the first lens has a focal length of 260 cm the
a a sealed glass bottle at room temperature is half-filled with ethanol slowly the temperature is lowered describe what
a student sits at rest on a piano stool that can rotate without friction the moment of inertia of the student-stool
you are standing on a canyon edge and you give a shout after 49 s have passed you hear your echo the temperature at the
the blank solution used to calibrate the spectrophotometer is 100ml of 02m feno33 diluted to 250ml with 01m hno3 why is
an object-spring system oscillates with an amplitude of 34 cm if the spring constant is 210 nm and object has a mass of
ethylene gas rmc2 rmh4 reacts with water at high temperature to yield ethyl alcohol rmc2 rmh6 rmohow many grams of
at beginning of the work up stage of the lab procedure the two phase reaction mixture probably contains the
a large tank is filled with methane gas at a concentration of 0585 kgm3 the valve of a 138-m pipe connecting the tank
insects do not have lungs as we do nor do they breathe through their mouths instead they have a system of tiny tubes
if an electron has a mass of 9709x10-31 kg and a proton has a mass of 1672x10-27 kg approximately how many electrons
in the conduction equation q kattl the combination of factors kal is called the conductance the human body has the
a large stick is pivoted about one end and allowed to swing back and forth as a physical pendulum the mass of the stick
when nacl is added to a solution of agno3 a white precipitate of agcl forms if concentrated ammonia nh3 is added to
a copper cable p1710-8ohmsm is designed to carry a current of 300a with a power loss of 2wm what is the required radius
a vessel contains 300 mol of ar 550 mol of cf4 and 150 mol of c2h6 gases if the partial pressure of ar is 1440 atm what
an automobile starter motor will draw 180a from the 12v battery of a car for perhaps 2 seconds in the process of
a certain spring has a spring constant k of 25 k nm and is compressed by 50 cm the spring is used in a gun to propel a
suppose that a combustion reaction takes place under adiabatic conditions that is no heat is exchanged with the
what is the thinnest soap film excluding the case of zero thickness that appears black when illuminated with light with
a circular curve of highway is designed for traffic moving at 75 kmha if the radius of the curve is 155 m what is the
write a chemical equation for caoh2 aq showing how it is an acid or a base according to the arrhenius
an object is undergoing simple harmonic motion with period 1250 s and amplitude 0570 mat t0 the object is at x0 how far
an electron in a hydrogen atom is excited with electrical energy to an excited state with n 2 the atom then emits a