1. If you have 25% radioactive parent atoms in a mineral crystal, and 75% daughter atoms, how many half-lives have passed?

Which temperature change indicates an increase in the average kinetic energy of the molecules in a sample? 15°C to 298 K 37°C to 273 K 305 K to 0°C 355 K to 25°C

The type of matter and its arrangement in an object

An ice cube is placed in a plastic cup on the lab table. Students record the mass of the ice cube and the plastic cup as 5 grams. One hour later the ice cube completely melts, turning into liquid water.

What does non polar mean?

Which organic compound is saturated? 1. ethene 2. propene 3. ethyne 4. propane

How do valence electrons relate to the chemical reactions of an element?

What is the weighted-average mass of all known isotopes for an element

What is the Celsius equivalent of 212°f

Identify the characteristics of tornadoes and hurricanes

When magma intrudes parallel to another rock layer, the formation is called a (n) A. sill. B. dike. C. extrusion. D. unconformity.