Answer is: D. It is not sodium bicarbonate.
Balanced chemical reaction of heating sodium bicarbonate: 2NaHCO₃ → Na₂CO₃ + CO₂ + H₂O.
This is chemical change (chemical reaction), because new substances are formed (sodium carbonate, carbon(IV) oxide and water), the atoms are rearranged, so there is no sodium bicarbonate (NaHCO₃) in the test tube.
Answer: 0.4375 mols of solute
Explanation:
The problem is asking for the amount of solute. We are given the value of molarity. The molarity is 0.25M. We know that molarity is 
. Since we are given the liters of solution is 1.75, we can use those values to solve for mols of solute.
[multiply both sides by 1.75 L]
There are 0.4375 mols of solute.
<span>False. Almost all of the oxygen on Earth is found in the oceans.</span>
The molecules in warm air are more expanded, move more rapidly and take up more room than in cold air. The expansion and movement of molecules makes it less dense, thus it rises above the cold air. Cold air molecules are more compressed, making them more still and packed together, thus making it more dense than warm air.
