The north pole of a bar magnet is moved close to the north pole of a second bar magnet. what prediction best describes how the first magnet responds when it is released? it will move toward the second magnet because like poles repel. it will move toward the second magnet because like poles attract. it will move away from the second magnet because like poles repel. it will move away from the second magnet because like poles attract.

The correct answer is C. It will move away from the second magnet because like poles repel.

Explanation.

Bar magnets, like all magnets have two poles. These two poles are , the north pole and the south pole.  The laws of magnetism state that unlike poles attract and like poles repel. A north pole brought close to a north pole will feel a force repulsive force.

In this case, when the north pole is moved close to the south pole, it will feel a repulsive force. When the magnets are let go this repulsive force will cause the first magnet to move away.

The correct answer is C. It will move away from the second magnet because like poles repel.

  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

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.