In the chemical formula for water, H2O, what does the "2" mean?
a. There are two oxygen (O) atoms in a molecule of water.
b. There are two hydrogen (H) atoms in a molecule of water.
c. The hydrogen in water is actually deuterium.
d. none of the above
b
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The dipole arrow in an S—Se bond would point toward the ______________ atom
Fill in the blank(s) with correct word
If we use 1 millimeter to represent 1 light-year, how large in diameter is the Milky Way Galaxy?
A) 100 millimeters B) 100 meters C) 1 kilometer D) 100 kilometers E) 1 million millimeters
If ice were denser than water, during winter lakes and ponds would
A) completely freeze B) remain liquid C) freeze on the surface but remain liquid beneath D) freeze on the bottom but remain liquid at the surface
Plane waves of ultrasound, f = 51.0 kHz, impinge on a flat plane with a 1.00-cm-wide slit. What is the total angular width (2?) of diffracted sound waves when the speed of sound in air is 340 m/s.
A. 167° B. 83.6° C. 19.5° D. 41.8° E. 0.11°