Density: A plastic block of dimensions 2.00 cm × 3.00 cm × 4.00 cm has a mass of 30.0 g. What is its density?
A. 0.80 g/cm3
B. 1.20 g/cm3
C. 1.25 g/cm3
D. 1.60 g/cm3
Answer: C
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If the temperature changes by 36
then what is the change in temperature in Celsius?
A. 40
B. 32
C. 26
D. 20
E. 15
The force of gravity is the only one of the four forces felt on large size scales. Which of the following best explains why the other forces don't play a major role on large scales?
A) The strong and weak forces act only on small scales, and large objects tend to be electrically neutral and therefore don't feel an electromagnetic force. B) The other three forces are all short in range, and cannot be felt over large distances. C) Gravity is by far the strongest force, so it simply dominates on large size scales. D) Effects of the strong and weak forces tend to cancel out effects of the electromagnetic force on large scales.
In a given period, the element of Group ______________ has the lowest ionization energy
Fill in the blank(s) with correct word
Magnesium has atomic number 12 . In its ground state, how many electrons are in its n = 3 shell?
a. 2 c. 16 b. 8 d. 10