Gail is wondering when the Sun will set. He knows that when his arm is fully extended, the width of one finger is approximately equal to the distance the Sun travels in fifteen minutes. Gail extends his arm, counts four fingers between the Sun and the horizon, and predicts the Sun will set in about one hour. How did Gail use math to help him determine approximately how long it would take for the Sun to reach the horizon? He used estimation.

He used significant figures.

He used precision.

He used accuracy.

He used summary statistics.

Asolution contains 180 g of glucose (c6h12o6) and 162 g of water. what is the mole fraction of glucose?

The ozone molecule o3 has a permanent dipole moment of 1.8×10−30 cm. although the molecule is very slightly bent-which is why it has a dipole moment-it can be modeled as a uniform rod of length 2.5×10−10 m with the dipole moment perpendicular to the axis of the rod. suppose an ozone molecule is in a 8000 n/c uniform electric field. in equilibrium, the dipole moment is aligned with the electric field. but if the molecule is rotated by a small angle and released, it will oscillate back and forth in simple harmonic motion. what is the frequency f of oscillation?

Suppose you mix one mole of sulfuric acid (h2so4) with 1 mole of sodium hydroxide(naoh). why does the ph of the solution remain below 7? ( explain so i can get better understanding! )