You start with a 500 g sample of Co-57. about how much time has passed if you end up with a 250 g sample

ABOUT IT Why does a hot water bottle feel warm? Molecules in the hot water bottle are moving faster than molecules in the skin. Molecules in the skin are moving faster than molecules in the hot water bottle. DONEN

According the the Kinect theory, what is the Kinect energy of a gas molecule proportional to? A. Volume of gas B. Pressure of gas C. Temperature of the gas D. Density of the gas

Which compound makes up nearly 30% of the "aroma" from human sweat?

What volume of water is required to prepare 0.1 M H3PO4 from 100 ml of 0.5 M solution?

Solve: When you mix two substances, the heat gained by one substance is equal to the heat lost by the other substance. Suppose you place 143 g of aluminum in a calorimeter with 1,320 g of water.

A student has two substances at a lab table. One substance is iron pyrite (fool's gold) and the other is real gold. After placing a 20.0-gram sample of iron pyrite into 40.0 mL of water in a graduated cylinder, it displaces 4.0 mL of water.

Hydrolysis is an example of which type of reaction?

Which of the following best represents a neutralization reaction

What is borons atomic number

Kinetic energy and potential energy are often considered to be forms of mechanical energy. List three other forms of energy and state a source for each.