A balloon is a sphere with a radius of 5.0 m. the force of the air against the wall of loan is 45 N. what is the air pressure inside the balloon? (Surface area = 12.56 x radius 2, 1 Pa = N/m^2)

Which of the following best describes a mole as used in chemistry? A a simplification of mathmatics B a salt dissolved in water C a very large number of objects D a measure of concentration

A beaker with 1.80*102 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 8.50 mL of a 0.470 M HCl solution to the beaker.

Aquino drives his skidoo 7 kilometers north. He stops for luch and then drives 5 kilometers south the 7 kilometers north what was his displacement?

Four of these quotes come from Shakespeare plays. One of them is actually a Justin Bier lyric. Can you pick out the lyric written by America's favorite male pop star?

Phenolphthalein is pink in an aqueous solution having a ph of (1) 5 (2) 2 (3) 7 (4) 12

The smallest unit of an element is a blank

How many sodium atoms will create an ionic bond with sulfur?

Rank the elements from smallest to largest electronegativity negativity (smallest at top) 1. N 2. P 3. As 4. Sb

A bicyclist pedaling up a Hill. What type of energy potential or kinetic?

What improvements have been made in modern farming? Select all that apply. 1. machines can do more work over less time 2. better seeds sprout and grow much more quickly 3. trains can transport food over long distances faster 4.