It is one hot summer day, so your mom tells you and your friends that you can have ice cream when the train comes through town. You and your friends decide to have a contest to see who will hear the train first. You decide to jump into the swimming pool and listen under water. You think water will help you feel and see the sound vibrations easier. Mary sits on a chair and decides that since air is thinner, the sound will travel faster through a thinner medium. Johnny puts his ear to the ground because he saw it in an old cowboy movie, and that is what the Indians did to hear the cowboys coming from a distance. Who is correct? Explain why that person is correct.

question1

1,000 tons

question2

3: 8

question 3

store d

step-by-step explanation:

  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

because growing process had stoped after 4-5 year