Frequent examination and testing make scientific explanations more

Reliable.

Explanation:

A scientific theory is the best model we have so far to describe a phenomena. I say "best model" because no scientific theory is the absolute truth; data from new experiments has potential to modify or even replace a theory with a new one, which can now explain the new data along with the previous observations.

You can come to trust new theories as they pass more and more tests, but you must always remember to have some skepticism because you never know whether your theory will agree with the new data from your next experiment.

dicrrdirrkdirckrrdrrk ; jhgfdsgrthyjkul; i'lkjhgfdskhjl; jhgdfs

  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