Answer: Water is the world's most common acid and base.
Answer:
you could measure several properties of
the unknown liquid and compare them with the properties of known
substances. You might observe and measure such properties as color,
odor, texture, density, boiling point, and freezing point.
Answer:

Explanation:
The relationship between the refractive index and the critical angle is given as follows:

where,
η = refractive index = 1.67
θc = critical angle =?
Therefore,


Rubber is a insulator so current cannot pass through it where as metal is a conductor which allows current to pass through it
Bodies in space traveled in circles.
The planets revolved around the Earth.