An electrical insulator is a material:
A) containing no electrons
B) through which electrons do not flow easily
C) which has more electrons than protons on its surface
D) cannot be a pure chemical element
E) must be a crystal
B) through which electrons do not flow easily
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Lithium, beryllium, and boron are elements with atomic number 3, 4, and 5, respectively. Even though they are three of the five simplest elements, why are they rare compared to many heavier elements?
What will be an ideal response?
Why does the Moon not have a magnetic field?
A. The Moon's magnetic field was destroyed by bombardment by planetesimals. B. The Moon lacks an atmosphere. C. It rotates very slowly and has a cold interior. D. Any field the Moon could generate is overwhelmed by Earth's field. E. Only planets can have magnetic fields.
Evaporation is when a gas is converted into a liquid
a. True b. False Indicate whether the statement is true or false
A heavy boy and a lightweight girl are balanced on a massless seesaw. If they both move forward so that they are one-half their original distance from the pivot point, what will happen to the seesaw?
A) It is impossible to say without knowing the masses. B) It is impossible to say without knowing the distances. C) The side the boy is sitting on will tilt downward. D) Nothing, the seesaw will still be balanced. E) The side the girl is sitting on will tilt downward.