How is diffusion used by cells? (Missed this lesson in school)

Gravity will pull a pencil down with the same force as a feather with the same mass. This is an example of what?

A food worker had safely cooled a large pot of soup to 70 F (21 C) with two hours. What temperature must the soup Reach in the four hours to be cooled properly

Which element will most easily lose an electron? A. Calcium (Ca) B. Potassium (K) C. Boron (B) D. Krypton (Kr)

List the exceptions to Metals showing a high density?

At a temperature of 274k, the gas in a cylinder has a volume of 4.0 liters. If the volume of the gas decrease to 2.0 liters, what mus the temperature be for the gas pressure to remain constant?

A wireless computer network uses radio waves to transmit signals. What device sends and receives radio signals in a wireless network? A) modem B) router C) digital translator D) digital interpreter

1. The gradual wearing away or breaking down of rocks by abrasion is a what type of weathering.

Molecules involved in a chemical reaction must meet to react. What is this concept called? Enthalpy Collision theory Enthropy Reaction rate

If a compound has a molar mass of 180 g/mol and its empirical formula is CH20, what is its molecular formula? CH20 C₂H4O2 C6H1206 C12H22011

Which element has six energy levels? A) rubidium (Rb) B) cesium (Cs) C) potassium (K) D) sodium (Na)