0 100
15 50
30 25
45 12.5
Based on the observations, which of these is most likely David's inference?
A.The half life period of radioactive sodium is 15 hours.
B.The half life period of radioactive sodium is 50 hours.
C.The amount of sodium left in the container after 60 hours will be 10.5 grams.
D.The amount of sodium left in the container after 60 hours will be 1.5 grams.
Answer: A. The half life period of radioactive sodium is 15 hours.
Explanation:
Half life is the time taken by a reactant to reduce to its original concentration. It is designated by the symbol .
Given:
At 0 hours the amount of sodium in container is 100 grams
After 15 hours , the amount of sodium in container is 50 grams which is half of the original amount of 100 grams.
It will take 15 hours for half of a 100 g sample to decay to half of the amount i.e. 50 grams.
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Answer:
Less than
Explanation:
The process of dissolution occurs as a kind of "tug of war". On one side are the solute-solute and solvent-solvent interaction forces, while on the other side are the solute-solvent forces.
Only when the solute-solvent forces are strong enough to overcome the pre-mixing forces do they overcome the "tug of war", and thus dissolution occurs.
Thus, it is concluded that the interaction forces between solute particles and solvent particles before they are combined are less than the interaction forces after dissolution.
For the dissolution of the soluteparticles in the solvent particles, the force of attraction between the particles of solute and between the particle of solvent must be less than the interaction between the solute particles and solvent particles after dissolution.
In a solution the forces act between the solute molecules, solvent molecules, and solute-solvent molecules. For the dissociation to take place the bond between the solute and solvent has to be formed. The resultant will result in the dissolution of the solute in the solvent mixture. The strong solute-solute and solvent-solvent bond will result in difficulty in the formation of the solute-solvent bond, and the dissolution will not take place.
Thus for the dissolution of the solute particles in the solvent particles, the force of attraction between the particles of solute and between the particle of solvent must be less than the interaction between the solute particles and solvent particles after dissolution.
For more information about dissolution, refer to the link:
b. 3.0
c. 0.20
d. 20
A) Synthesis
B) Decomposition
C) Double Replacement
D) Single Replacement
I choose C was wondering if I was correct
Answer:
C: Double Replacement
Explanation: