Suppose you deflate a bicycle tire by depressing the air valve. Why does air rush out of the tire? After the air stops rushing out of the tire, is the tire empty? Explain your answer
What will be the ideal response?
ANSWER: The air pressure in the bicycle tire is higher than in the surrounding surface air, which creates a difference in pressure. The pressure difference establishes a force (called the pressure gradient force) that causes the air to move from higher pressure toward lower pressure. Consequently, if we remove the air valve on the tire, air is going to flow out the tire until the same pressure exists inside the tire as outside the tire. The tire will not deflate entirely, only as long as there is a pressure gradient.
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Which of the following occurs when amines react with water?
A) The amine loses a hydrogen atom. B) The amine loses a lone pair of electrons. C) The lone pair of electrons of the amine forms a covalent bond with a hydrogen atom of water and a hydronium ion is displaced. D) The lone pair of electrons of the amine forms a covalent bond with a hydrogen atom of water and a hydroxide ion is displaced.
Magnet A has twice the magnetic field strength of magnet B, and at a certain distance pulls on magnet B with a force of 100 N. The amount of force that magnet A exerts on magnet B is
A) at or about 50 N. B) exactly 100 N. C) not enough information given
The well water drawn from Indian tube wells was found to have been contaminated with:
A) methyl isocyanate B) arsenic C) radiation D) DDT E) none of the above
The topographic highlands, or ranges, in this area labeled A are also called ________ blocks
Fill in the blank(s) with correct word