Which of the following describes the conversation of chemical energy to heat energy?

a: a chair sitting still

b: a leaf absorbing sunlight

c: a battery powering a cell phone

d: a rock hitting the ground

Real life examples of limiting reactants

The amount of which subatomic particle is different between an atom and its ion?

A neutral atom of potassium (K) has an average mass of 39 amu and 19 electrons. How many neutrons does it have? 10 19 20 58

How are speed and velocity related

What is the electrical charge of an atom that has lost an electron

Carbon-14 has a half-life of 5730 years. In a plant fossil, you find that the 14C has decayed to 1/4.00 of the original amount. How long ago was this plant alive?

Balance this equation---> Fe (s) + O2 (g) - - - >FeO (s) (s) = solid (g) = gas

During an endothermic phase change, what happens to the potential energy and the kinetic energy?

What is the difference between pure substance, element, and compund

Butane gas is used as the fuel in disposable lighters. It burn in oxygen to form carbon dioxide gas and water vapor. What mass of carbon dioxide is produced when 53.3 g of butane is burned in 103.9 g of oxygen