(a) an electron in a television tube travels the 12 cm distance from the grid to the screen at an average speed of 2.00 107m/s. how long does the trip take? s (b) an electron in a current-carrying wire travels at an average speed of 7.00 10-5 m/s. how long does it take to travel 12 cm?

time = distance/speed = 0.12/2x10^7 = 0.06x10^-7s

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂

radiation

explanation:

heat is transmitted by radiation