I think it’s b I’m not sure so sorry if incorrect. Take care.
The way that products and reactants have different amounts of energy without violating the law of conservation of energy is by having the energy change from one form into another.
Hope this helps :)
Answer: Water is much more denser than ice and due to this ice floats on water.
Explanation:
- when water changes from liquid to solid state its density also changes.
- Ice has lesser density than that of water due to which it floats in water.
So, due this property of water ice was formed on the surface of the water when kept in freezer.
Answer:
10.5g
Explanation:
First, let us calculate the number of mole of NaHCO3 present in the solution. This is illustrated below:
Volume = 250mL = 250/1000 = 0.25L
Molarity = 0.5M
Mole =?
Molarity = mole /Volume
Mole = Molarity x Volume
Mole = 0.5 x 0.25
Mole = 0.125 mole
Now, we shall be converting 0.125 mole of NaHCO3 to grams to obtain the desired result. This can be achieved by doing the following:
Molar Mass of NaHCO3 = 23 + 1 + 12 +(16x3) = 23 + 1 +12 +48 = 84g/mol
Number of mole of NaHCO3 = 0.125 mole
Mass of NaHCO3 =?
Mass = number of mole x molar Mass
Mass of NaHCO3 = 0.125 x 84
Mass of NaHCO3 = 10.5g
Therefore, 10.5g of NaHCO3 is needed.