Which phenomenon demonstrates the particle nature of light?

a. Diffraction c. Photoelectric effect

b. Interference d. Refraction

How hot can the earth possibly get?

How many unchanged atoms would remain after 3 half-lives if the initial sample had 600 atoms? Explain.

How many moles of carbon (C) atoms are equivalent to 38.1 g C?

What is a rock that forms when pressure, temperature, or chemical processes change an existing rock

Classifying living things

Hypervitaminosis is a serious health threat associated with excessive amounts of ingested fat-soluble vitamins. why do water-soluble vitamins not commonly pose the same threat?

Hydrogen is an element with two naturally occurring isotopes: 2 H and 3 H. This means that 2 H, which has a mass number of 2, has fewer than 3 H, which has a mass number of 3. True/False

C₂H₂ + O2 - CO₂ + H₂ How many moles of oxygen are necessary to react completely with 4.0 moles of propane (CH) ?

What are the two main classifications of energy resources?

A liquid is heated and a solid forms at the bottom of the beaker. Is this a physical or chemical change?