Chem quiz

1.If you fill a glass to the brim with ice water and the ice melts, what will happen?
   A.The glass will over flow as the ice turns to water.
   B.The level of water in the glass will remain unchanged as the ice melts.
   C.The water level will drop slightly as the ice melts.

   D.I'll never find out because I'll drink the water or walk away before anything happens.

Answer: The water level will drop slightly as the ice melt.

Explane:-One interesting property of water is that it achieves maximum density as a liquid, not as a solid. So, ice is less dense than water and floats. When it melts, it becomes more dense. More mass per unit volume means the level of the liquid drops slightly. 

2. DNA codes for proteins, which are the building blocks of organisms. What is the most abundant protein in the human body?
    A.Tubulin
    B.Albumin
    C.Collagen

    D.Keratin 

Answer;Collagen

Explane:-You'll find keratin primarily in your hair, nails, and skin, but the most abundant protein in humans is collagen, which is found in bone and cartilage. Both proteins are strong and flexible.

3.What is the most common isotope of hydrogen? 

    A.Protium

    B.Deuterium

    C.Tritum

    D.Hydrogen only has one isotope

                                 

Answer;-Protium

Explane:-Most of the hydrogen in the world is protium (one proton, no neutrons), but some deuterium and tritium occurs, too. Tritium is radioactive. Deuterium is not radioactive and is the form of hydrogen found in heavy water.