NURSING ANM AND GNM

NURSING EXAM QUESTIONS

BIOCHEMISTRY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
When you place shells in vinegar (an acid), what happens?
A
Bubbles and the shell stays the same
B
Bubbles and the shell starts to disintegrate
C
No changes seen
D
None of the above
Explanation: 

Detailed explanation-1: -Eggshells are made of calcium carbonate. If you soak an egg in vinegar the eggshell will absorb the acid and break down, or dissolve. The calcium carbonate will become carbon dioxide gas, which will go into the air. What is left is the soft tissue that lined the inside of the eggshell.

Detailed explanation-2: -If you soak this egg shell in vinegar (which is about 4% acetic acid), you start a chemical reaction that dissolves the calcium carbonate shell. The acetic acid reacts with the calcium carbonate in the egg shell and releases carbon dioxide gas that you see as bubbles on the shell.

Detailed explanation-3: -Ocean acidification can negatively affect marine life, causing organisms’ shells and skeletons made from calcium carbonate to dissolve. The more acidic the ocean, the faster the shells dissolve.

Detailed explanation-4: -Shells are made of calcium carbonate. Calcium carbonate reacts to the acid in vinegar and if the shell is left in the vinegar for a few days, it will actually dissolve!

There is 1 question to complete.